run_matrix.sh drives interleaved monolith/inproc/spawn+shm/spawn+tcp
benchmark rounds on an adb device with per-run arm-marker verification;
profile_matrix.sh layers simpleperf, ftrace wakeup capture and a /proc
sampler on top; make_report.py aggregates runs into REPORT.md. The wifi
kit carries the cross-host control-plane hang repro and phone-side
strace/fd-reconcile helpers. .trace-work/ (run output) is now ignored.
MOBILEGL_BUILD_TRACE_REPLAY now also produces mobilegl_trace_replay on
ANDROID: the same CLI as desktop, linked against the APK runner's
glws/glproc glue. On the device it dials a render server with no
Activity at all - MOBILEGL_IPC_CONTROL=unix:@name with shm data to the
offscreen supervisor (a cross-uid abstract connect needs root or an
SELinux waiver; loopback TCP works from plain adb shell), or
tcp:// with MOBILEGL_IPC_SURFACE=server to the on-screen display server.
glws_android grows the desktop glws_egl's server-owned null-window
createWindowSurface, gated on MOBILEGL_TRACE_SURFACE=window so the APK's
pbuffer mode keeps its old answer, and the config carries EGL_WINDOW_BIT
for it. The control screen refuses unix endpoints in on-screen mode:
the in-process display server serves tcp:// only.
Verified on-device with an OpenRA retrace, ssim=1.0 both ways:
offscreen service on @mgl-cli with the CLI as root, and the display
Activity on tcp://127.0.0.1:40613 with the replay's frames on the
phone's screen.
transport_wait_ns measures wall time in Ring::Wait's flush/spin/sleep, so
the client's parked time is read directly instead of inferred by
subtracting CPU clocks that run concurrently with the server.
frame_stats.py matches client and server present serials into per-frame
avg/p50/p99 splits; the README documents the MOBILEGL_PIPE_STATS=1
workflow.
- README, ARCHITECTURE, ROADMAP, MEASUREMENTS and CURRENT_STAGE_PROGRESS are rewritten as indexes
(84 KB -> 15 KB): what the project is, where it stands, and where each detail lives. ROADMAP is one
plain sentence per phase; MEASUREMENTS is the five conclusions that matter plus one line per phase;
CURRENT_STAGE_PROGRESS is the P12 goal, a checklist and the next steps.
- ARCHITECTURE's body moves unchanged into ten design/ files, keeping §1-§17 and appendices A/B, so
`ARCHITECTURE.md §N` references in code resolve through the table in ARCHITECTURE.md.
- guide/ holds build-and-run, code map, glossary and the engineering discipline (from README and
ROADMAP), and the device pinning record that used to sit in devices/.
- The open-debt table moves to notes/DEBTS.md; the detailed current-stage tables (with decision IDs,
the open line items and evidence locations) move into notes/p12/README.md. notes/README.md maps
every moved path and section.
- The documentation citation lint in test.yml also covers design/ and guide/, which describe the
current tree as the top-level files did.
- ROADMAP, MEASUREMENTS and ARCHITECTURE are rewritten as summaries (333 KB of index text -> 84 KB).
ROADMAP's phase table is one line per phase plus a link; MEASUREMENTS keeps headline numbers under
its old §1-§13 numbering (plus §14-§16 for P6.5, P7 and P12); ARCHITECTURE keeps every decided rule
under the same §1-§17 / appendix numbering, so the `ARCHITECTURE.md §N` references in code still
land, and §17 becomes an index of the phase landing shapes.
- CURRENT_STAGE_PROGRESS now describes the current stage (the P12 on-screen-server subset) and absorbs
CURRENT_STAGE_STATUS, which is removed. The P7 status tables, the P6 closing snapshot and the P6.5
first-wave snapshot move to notes/p7, notes/p6 and notes/p65.
- Each phase gets notes/<phase>/README.md: a short summary, then the verbatim material that left
the index documents (its ROADMAP row, its MEASUREMENTS section with subsection numbers kept, its
ARCHITECTURE §17 part, milestones) and a file index. P8-P11 and P13 get their planned scope;
the full open-question list moves to notes/OPEN-QUESTIONS.md.
- The phase reports that sat at the top level move into their phase folders with unchanged names:
P5D-INPROC-PERFORMANCE, P5E-RUNAHEAD, P5F-WIRE-COMPLETENESS, P6-SPAWN-PLAN, P6-CONTRACT-DRAFT,
P6-ENDSTATE-REVIEW. Their relative links, CONTRACT-P6.md's links to them and one tool docstring
are updated; notes/README.md maps every old path and section number to its new place.
- 71 files under notes/recovered/ that were byte-identical copies of phase-folder files are removed.
- Corrections made while condensing: the server process reads Transport as Spawn (CONTRACT-P6 §3.1
amended the old "child forces monolith" rule); both backends now publish kCapRunAheadApply;
MOBILEGL_IPC_RESPAWN is a named refusal and MOBILEGL_IPC_IDLE_EXIT_S is not parsed; the Redmi
pin row is in tools/device_bench/pin_device.sh.
check_doc_citations over docs/Disaggregated/*.md: 0 problems. No relative link is newly broken.
- the round-2 merge folded "TCP session has no forwarded server log" into the one server-log
check for every transport, and its message named only MOBILEGL_TRANSPORT - which is `spawn`
for the tcp arm too (tcp = spawn + MOBILEGL_IPC_CONTROL=tcp://), so the tcp arm's missing
forwarded log read as a plain spawn red
- the message carries MOBILEGL_IPC_CONTROL='...' after the transport (empty for inproc and
plain spawn); message only, no check moved
- the spawn server-log fatal from the previous round sat BEFORE the marker check and the
`spawn ARMED ... pid` check, so a launch or handshake failure - no server process, no ARMED
line - reported "the run wrote no server log" instead of the more specific "resolved, but
carries no spawn ARMED", and sent the reader to the wrong process. It now sits just before
the census; the tcp arm's "no forwarded server log" check, which had the same placement,
moves with it
- the inproc row demands the server log too. Under inproc every server-role line is routed
by thread role to the `.server.log` sink, opened lazily on the first such line, and at the
INFO level this lane demands ServerLoop writes one when mgl-srv-apply starts - so a clean
inproc run always has the file, and "no file" read as "0 lines" was a green Fatal{ and
MGWIRE-FLOOR census of the role that emits both. The two census reads are unconditional
now: the fatal above them is what makes the file exist
- fail-closed demonstrations, OpenRA DirectVulkan, the replay wrapped to damage one log after
a real run: inproc with the server log deleted went rc 0 on the previous runner (both
censuses printed 0) and is now a fatal at the census; spawn with the server log deleted is
the same fatal; spawn with the server log deleted AND the ARMED line removed reports the
ARMED message, where the previous runner reported the server-log one; spawn with only the
ARMED line removed reports the ARMED message. Undamaged, OpenRA DirectVulkan and DirectGLES
SPLIT and SPAWN stay green, 0 unsound lines
Fable review of the B3 rework, should-fix: run_trace_case.cmake read the
server log only `if(EXISTS ...)`. Under spawn the server process writes its
own file, and the lines the runner counts out of it - the applier Fatal{
lines and the MGWIRE-FLOOR unsound-serial-complete line, which only the
server's VulkanRenderer::OnSubmitsCompletedUpTo emits - are nowhere else,
so a server that died before its first line read as "0 lines" and went
green. The client log was already fail-closed, and so was the tcp arm's
forwarded server log; plain spawn was not.
The plain-spawn branch of the transport block now FATALs when
mobilegl.server.log does not exist, beside the tcp arm's identical check.
Demonstration: the SPAWN ctest command line with TRACE_REPLAY_EXE replaced
by a wrapper that runs the real replay and then deletes
output/mobilegl.server.log (541 lines):
runner at aab01275 -> rc 0, "Fatal{ lines across ... : 0",
"MGWIRE-FLOOR unsound-serial-complete lines: 0" (green, half unseen)
this runner -> rc 1:
CMake Error at run_trace_case.cmake:321 (message):
OpenRA DirectVulkan: MOBILEGL_TRANSPORT=spawn but the run wrote no
.../output/mobilegl.server.log, so the server role's Fatal{ and
MGWIRE-FLOOR lines cannot be counted. A spawn retrace with no
server log cannot be counted as a clean one.
MobileGLTraceReplay.OpenRA.DirectVulkan.SPLIT / .SPAWN unmodified: both
pass, ssim 1.000000, 0 px, 0 MGWIRE-FLOOR lines.
Review ID-P7-34, item 2. The primary B3 fix - the clamp in
VulkanRenderer::OnSubmitsCompletedUpTo that raises the completed-frame-
serial floor only to a serial no in-flight submission still carries - had
nothing behind it: deleting the clamp loop left every lane green and the
OpenRA picture gold on lavapipe (the host's barriers hide the tear). Its
only observable was the per-event MGLOG_W "MGWIRE-FLOOR
unsound-serial-complete".
run_trace_case.cmake now reads that line out of both roles' logs on every
split run, exactly as it already reads Fatal{: the count is printed pass
or fail and any nonzero count is a FATAL_ERROR. The R-16 counter (26 -> 0
on the OpenRA retrace) is thereby a gate.
Red/green on MobileGLTraceReplay.OpenRA.DirectVulkan.SPLIT / .SPAWN:
clamp loop deleted -> both FAIL at ssim 1.000000 / 0 px:
MGPipe split: OpenRA DirectVulkan transport=inproc, MGWIRE-FLOOR
unsound-serial-complete lines: 26
[mgl-srv-apply/WARN]: MGWIRE-FLOOR unsound-serial-complete #1: advancing
the completed frame-serial floor to 3, which submission 3 (serial 3)
still carries
(spawn: identical, 26)
clamp restored -> both PASS, 0 lines.
run_cts.py silently tolerates a missing --skip-file, so the known device-killers from
the skill (clip_distance.functional, the multisampled_to_singlesampled blit family,
the rgb565 repeat-mode case) would each have cost a reboot in the gate-5 window.
KHR-GL46 has no uniform_buffer_object group; the 90 UBO cases are
GTF-GL46.gtf31.GL3Tests.uniform_buffer_object*, present only when the deployed glcts
was built with GTF - the device probe decides. KHR-GL46.shader_storage_buffer_object
(124) is the block that exercises what cluster A actually refuses today: unaligned
and over-range SSBO bindings, not only UBO byte tails.
Cut from VK-GL-CTS 0b04c470ed78569b0b778ece1262d88455ab2b00 (main; the deployed glcts build's source) mustpass
gl46-main.txt and gl33-main.txt: texture_*, shader_image*, packed_pixels,
direct_state_access, uniform_buffer*. The gl33 variants are the fallback the runbook
names for an Android runner that cannot open a 4.6 core context; whichever version the
probe selects, BASE and AFTER read the same list. A 0.5 pp gate needs a committed
denominator, not a glob over someone's checkout.
wave 0 item 5. Three instruments P7's device window needs, and the CI steps that
can make each of them red.
run_tcp_matrix.py --backend DirectVulkan end to end. --backend already existed and
already filtered by each case's ci_backends; what did not exist is a per-backend
GOLDEN. The two backends shared `golden` plus an optional `alternate_golden`, and
alternate_golden is an OR across backends, not a per-backend key - so a
DirectVulkan run that matched the DirectGLES picture passed, which is the "went
green on the wrong arm" shape the exit gate exists to catch. trace_cases.json
gains `backend_overrides.<backend>` ({golden, alternate_golden, ssim_threshold}
only: restating target_call or a crop would stop the two backends retracing the
same frame through the same window). A per-backend golden REPLACES the shared
pair, matching another backend's declared image is refused BY NAME, and a --case
named explicitly that does not run a requested backend is an error instead of one
plan fewer and no message. The CMake emitter and the APK matrix refuse a case that
declares the key rather than silently emitting one golden for both arms.
DirectGLES is unchanged and that is asserted, not asserted-in-prose: a case with no
override resolves to itself, and the key is dropped from the resolved case even for
the backend that overrides nothing - so giving DirectVulkan its own golden does not
move the DirectGLES identity fingerprint and does not invalidate its checkpoints.
Each results.json row now records the golden, alternate golden and threshold it was
scored against.
run_android_retrace_local.py gets --matrix (the CI split subset, 39 cases, each
running only its own ci_backends - not --all, which adds the rd12 workload ID-P7-4
excludes), --repeat N, and --archive-dir. The archive is the point: the result root
is keyed by case and backend and by NOTHING else, so repeat 2 overwrites repeat 1
and the only artefact that survives a three-repeat run is the last one, which makes
"were the three repeats the same picture?" unanswerable after the fact - in the one
place where re-running to find out is expensive. It also refuses --benchmark with a
non-monolith --transport, which has always produced a monolith run under a spawn
label (run_benchmark_case passes args.env alone; p6/README.md records the pitfall).
compare_actuals.py computes the pair result.json cannot: SSIM between two actual
PNGs, plus a case x repeat x ssim-vs-golden x ssim-vs-first-repeat table over an
archive. It is the retrace gate's OWN SSIM - a transcription of ComputeChannelSsim
/ ComputeRgbSsim (trace_replay_core.cpp:630/:671), the only SSIM in the tree - and
the crop comes from each repeat's own result.json, so the two columns describe the
same rectangle. PNG decode is stdlib zlib, because an unavailable Pillow in the
device window would turn "the repeats diverged" into "the tool did not run".
TraceReplayActivity: resolveSpawnServerPath's two decisions were String.contains()
on the whole joined K=V;K=V list and neither was entry-aware. The one that bit:
`--env MOBILEGL_IPC_SERVER_PATH` with no '=' is the documented UNSET spelling
(trace_env_overrides_test.cpp:92) and the only way to ask for "spawn with no image"
and watch LaunchServer refuse by name - it did not match "MOBILEGL_IPC_SERVER_PATH="
so a resolved path was appended AFTER it and, because ApplyEnvOverrides applies in
order with setenv(...,1), the deliberate unset was silently undone. That is exactly
the "silently replacing it would make that knob untestable" the method's own comment
forbids. Two more: the key inside another entry's VALUE flipped both decisions the
wrong way, and the transport match was case-sensitive while ConfigLoader lower-cases
the value before matching (ConfigLoader.cpp:322). The parse moves to
SpawnServerPath, a class with no android.* import, so test_android_lifecycle.py
compiles and runs it with plain javac - the parse had no host-side coverage at all,
and its on-device failure mode is "the knob had no effect".
Only spawn gets a path, deliberately: it is the only transport that execs an image.
Red-once, all four: a stub case whose result names the DirectGLES golden fails a
--backend DirectVulkan run with "matched a golden another backend declares"; a
synthetic PNG pair with a closed-form SSIM (identical = 1.0 exactly, constant
black vs white = C1/(255^2+C1), inverted halves = (C2-2v)/(2v+C2)); the pre-fix
resolveSpawnServerPath body fails eight of SpawnServerPathTest's checks; and the
DirectVulkan TCP proof battery is the DirectGLES one under the other prefix,
because an empty prefix selection raises nothing and reads as a clean pass.
CI: test_run_tcp_matrix.py and test_compare_actuals.py join the R-16 step. The
matrix driver's stub regressions had NO CI step - they were run by hand and
recorded in a note - and they guard the tool that decides whether a device golden
run passed.
Counts in WSL: test_run_tcp_matrix 12 -> 18, tcp_lane_tools 4 -> 6,
test_compare_actuals 12 new, test_android_lifecycle green with the new Java unit.
Gate 8's last two numbers (SEG_STAGE bytes/frame, records/frame post-
chunking) had no producer at all: the summary line's byte classes are
backend-to-driver bytes and maxrec is a max, not a per-frame. Two push-
guarded counters answer them at their single choke points - ByteClass::
StageSegmentBytes at PipeWireCodec's StageAllocate (the only allocation
behind StageBytes, so every buffer walk, texture slab and CSO archive
lands there and emitters cannot double-count) and CallClass::WireRecords
on EncodeRecord's committed path (post-chunking an emitter no longer
knows how many records its one call produced). A staged-blob histogram
rides along. G1 holds: symbols 0/0/0/0, .text byte-identical, pull build
carries no MG_Remote symbols.
The spawn server never counted anything: PipeStats::Init() is a step of
MobileGL::Initialize(), which ServerMain never reaches, so every Enabled()
site in that process - including ServerLoop's own ServerWaits/ServerParks
publish - stayed false and the server log carried no summary line at all
(a zero that means 'another process' printed in the shape of one that
means 'never waited' is the milder misreading; the line was simply
absent). ServerMain now arms and closes PipeStats at its role boundary -
after MG_ConfigLoader::Init (Init latches from the parsed config), after
the server-role latch (the log sink's role), and before ::_exit(0).
Red-once: 0 server summary lines before, 29 after, SSIM 1.0 unchanged.
MOBILEGL_PIPE_STATS_FILE now derives per role through the log sink's
exported RoleLogPath rule - run.client.json / run.server.json, the bare
name resolves to no file - because both roles reach FormatJson() and ofstream
trunc made the second writer replace the first. G1 caught three separate
leaks on the way (a string temporary in the monolith body, one resized
Shutdown() from unequal #if arms, two rewritten MGLOG_W literals in
.rodata); the pull arm is statement-for-statement the original.
Device tooling for the paired A/B lands with it: pin_device.sh gains a
measured 2f7cbe2e entry (this board clamps the GPU at 1050 MHz -
thermal_pwrlevel writes 0 and reads back 1, max_gpuclk is read-only;
absolute times are not comparable with the 1100 MHz-era rows), and
tools/device_bench/p6/ carries the session collector and renderer beside
run_android_retrace_local.py's MOBILEGL_TRACE_PACKAGE override.
Unit 2367/2367 (PipeStats 25/25), spawn integration 102/102.
The spawn work had the two roles append to one MOBILEGL_LOG_FILE_PATH under
O_APPEND. It was correct - two processes at one offset would corrupt the file,
O_APPEND made each write atomic - but it put two sessions' lines in one place
and made every per-side assertion a search. This splits the sink: the client
role writes <base>.client.log and the server role writes <base>.server.log.
THE BASE NAME NAMES NO FILE ANY MORE, AND THAT IS THE POINT. Leaving the
client at the old unsuffixed path would have been the compatible choice and the
wrong one: a reader that was not updated would go on finding a file, go on
passing, and go on seeing only half the session - and a refusal census that
reports a confident zero for the half it cannot see is worse than one that
fails. With both names moved, an un-updated reader gets "file not found" and
says so. There were 34 such readers; every one is moved here.
THE ROLE IS PER-THREAD, not per-process, because under inproc both roles are
threads of one process. Log.cpp keys the sink on a thread-local role: the apply
thread declares itself server (ServerLoop.cpp), a spawned image is server for
its whole life (MOBILEGL_IPC_ROLE=server, read once), and everything else is
the client. The naming rule (RoleLogPath) and the two whole-log operations
(ReadRoleLogs / TruncateRoleLogs) are EXPORTED from the library, so no reader
reimplements the derivation - a second copy is the copy that falls behind.
Readers, by how they read:
- unit mains set MOBILEGL_LOG_FILE_PATH and read a role file: they keep the
base in the env and derive the client path from the library helper.
- the death-test child runners (ReadLog) now concatenate BOTH roles: a death
test asserts the CHILD said something, and the applier's refusals - the very
diagnostics these check - are written under the server role.
- the offset-based Emit readers derive the client path once after setenv.
- PipeStatsWindow reads both, because draws/vbs increment in the backend's
PrepareForDraw - the apply thread, the server role - so the summary line is
in the server file even under inproc.
- run_trace_case.cmake's split census reads both files; the client keeps the
transport markers.
- split_log_paths.py (and its self-test, and the control stub) derive both
role files from the declared base.
- the Android script pulls both role files off the device and concatenates
them, so every downstream check is unchanged - and it judges a role file by
CONTENT, because `run-as test -f` through `exec-out` returned 0 for a missing
file on the device and `exec-out` folds cat's own not-found line into stdout.
The monolith arm legitimately has no server file, and that is a silent skip
rather than a one-line server log.
Guarded so a pull build is untouched: RoleLogPath and the role sink are wholly
inside MOBILEGL_BUILD_DISAGGREGATED; a non-disaggregated build writes the base
path exactly as before. G1 re-measured - 0 symbol diff, .text unchanged at
0xa52203.
Verified on device 2f7cbe2e: monolith writes only the client log (no phantom
server log), inproc and spawn each write both and pass their transport proofs
(spawn: server role in pid 16125). Unit 2353 (one pre-existing environmental
failure), integration-split 186/186, integration-spawn 102/102, retrace 6/6,
control smoke 12/12, split-log-paths self-test 9/9.
The Android retrace matrix gains a third lane, spawn-acceptance, beside
monolith-control and inproc-acceptance. Until now nothing in CI had ever
started a second MobileGL process on a device at all.
The apk.yml retrace job already carried a `transport` matrix dimension and
already branched on it, so the lane itself is three edits: a row in
github_transport_matrix, an elif in the retrace step, and a summary to render.
What needed thought was the gate.
THE SPAWN LANE IS APK-ONLY, and that is a statement about where evidence is
missing rather than about what spawn can do. Linux already has
test.yml's `retrace-split`, which is {backend, case, transport} over inproc AND
spawn with the two negative controls that make it mean anything. A spawn row in
the Linux transport matrix would pay for a second full sweep proving nothing -
and test.yml's `retrace` job stages no server image, so the lane would not
merely be redundant, it would be red. self_test_transport_matrices now asserts
the absence in both directions, because an accidental removal of the `if apk`
has to be caught in the self-test rather than in CI.
--require-spawn REQUIRES TWO SENTENCES, and the second is the one that matters.
ConfigLoader's marker proves the VALUE RESOLVED - it exists only in the Spawn
arm, which exists only under MOBILEGL_BUILD_DISAGGREGATED - but that is a
statement about a parser. `spawn ARMED - the server role runs in pid N` is
written only after the launch, the connect and the handshake have all
succeeded, and the pid in it is the SERVER's. It is the only line in the log a
same-process run cannot produce.
Both halves red once, measured:
* a monolith run demanded to prove spawn: REFUSED, transport_resolution_marker
false, server_pid null - while the retrace itself scored ssim=1.000000,
which is exactly the trap. OpenRA matches its golden under monolith too, so
the picture has never been the evidence.
* the same run's real spawn log with the one ARMED line deleted: REFUSED,
transport_resolution_marker TRUE and server_pid null. That is the
"resolved the transport and then never left the process" case, isolated.
THE PROOF USES `any` WHERE THE inproc GATE USES `all`, and the difference is
load-bearing rather than a relaxation. Under spawn two processes append to one
MOBILEGL_LOG_FILE_PATH, and the launcher deliberately scrubs every
MOBILEGL_IPC_* from the child's environment (anti-recursion catch (b)) - so the
server's own `Config: IPC` line reads strict=0 role-split-state=0 BY
CONSTRUCTION. Demanding every line match would red every spawn run for the one
thing the design requires.
--use-pbuffer is not optional on this lane: until P12 a spawned server cannot be
handed a window, because an ANativeWindow* is a pointer into the CLIENT's
process (Rule H). MOBILEGL_IPC_SERVER_PATH is deliberately NOT passed -
nativeLibraryDir carries an install-time hash that nothing off the device can
spell, and the Activity resolves it.
The local runner now passes the same knobs and the same --require-* flag CI
does, so "it works locally" can no longer mean "it ran monolith locally". That
change immediately caught its own omission: the first local run with the gate
armed failed on client_ipc_line_present=false because the runner had been
sending MOBILEGL_TRANSPORT alone.
Verified on device 2f7cbe2e: OpenRA.DirectGLES spawn, ssim=1.000000,
mismatchPixels=0, "real spawn transport, server role in pid 9885, and zero
Fatal records confirmed".
OpenRA.DirectGLES, transport=spawn, on a Redmi: ssim=1.000000,
mismatchPixels=0, zero Fatal{ lines, three runs for three. The server is a
process the client launched out of the APK's lib/arm64/, and the client's own
log names its pid.
Four things stood between the desktop green and the device green, and every
one of them was invisible on desktop for the same reason: a build tree is not
a deployment, and Linux is not Android.
1. THE SERVER COULD NOT LINK. It links libMobileGL.so and is EXEC'd, not
dlopen'd, so it gets a fresh linker namespace with the DEFAULT search path
- and an APK's lib/<abi>/ is not on it. `CANNOT LINK EXECUTABLE ...:
library "libMobileGL.so" not found: needed by main executable`, before a
single line of MobileGL ran. On desktop CMake had been giving the target an
absolute build-tree RPATH, so the WSL server resolved its dependency
through a path no phone has. $ORIGIN is asked for via BUILD_RPATH (a raw
-Wl,-rpath,$ORIGIN reaches the generator unquoted and the SHELL eats it -
the device linker said `normalize_path - invalid input: "$"`), and because
the NDK drops RPATH from the link anyway, the LAUNCHER states
LD_LIBRARY_PATH: it is the one component that has already resolved where
the image lives, and a pair that is not co-located is not a pair.
2. THE RENDEZVOUS NEEDED A WRITABLE DIRECTORY. An Android app has no /tmp, so
bind() in the child had nowhere to put the node and the client refused by
name 20 s later. AF_UNIX endpoints now accept the ABSTRACT namespace with a
leading '@' - the systemd/D-Bus convention - which has no filesystem
presence at all: no directory, no mode bits, and no stale node to unlink
after a crash, which is the bind() failure Listen() has been working
around. Its reach is the network namespace, which for an app is the app.
StartSpawned mints '@' names; an explicit path still works everywhere, and
that is what P12's "connect to something somebody else is listening on"
will use.
3. PBUFFER WAS A DirectGLES-ONLY KNOB. Twice over: trace-replay-ci.sh gated
`--ez use_pbuffer true` on the backend name, and the JNI demanded a native
window for DirectVulkan unconditionally. A surface SHAPE is not a backend
property, and the coupling mattered because the Android GLWS makes a window
surface whenever gNativeWindow is non-null - so handing Magma a window was
the same as asking for one. Until P12 a spawned server cannot be given a
window at all: an ANativeWindow* is a pointer into the CLIENT's process and
SetWindowHandle is refused on the way across with Fatal{UnmigratedSurface,
"AndroidNativeWindow@P12"} (Rule H). Which is exactly what happened, one op
after the server had come up green.
4. THE RUNNER LOOKED IN ONE OF THE TWO OUTPUT DIRECTORIES. assembleTraceRelease
writes apk/trace/release; CI has staged the same artifact under
apk/trace/debug. A tree that has built locally has both, and picking the
wrong one retraces last month's APK and says nothing about it. Newest of
either, now.
MEASURED AND NOT FIXED: DirectVulkan on this device diverges under BOTH split
transports and does so nondeterministically - inproc scored ssim=0.988998 /
9836 px, spawn scored 0.976494 / 14658 px and then 0.988998 / 9836 px on a
repeat, while monolith with the same pbuffer surface scores 1.000000 / 0 px.
The two transports draw from the same set of outcomes, so this is the split
path on Magma against a real GPU, not the process boundary: P6 neither caused
it nor can fix it. DirectVulkan spawn IS green on desktop (lavapipe, 1.000000).
G14: one test name added, AnAbstractEndpointNeedsNoWritableDirectoryAndLeaves-
NoFile, which pins both halves - the handshake crosses an abstract name, and
nothing is left on the filesystem. A '@' mistaken for a path would have bound
a file of that literal name, passed here, and failed on the one platform this
exists for.
Two small pieces, so an Android spawn arm is a flag rather than a project.
THE RUNNER GAINS --transport. It already had a generic env passthrough - one
intent extra carries `K=V;K=V` all the way to setenv before the library is
dlopened - so the transport itself costs one entry and no new plumbing in the
five files between here and the device. monolith passes NOTHING rather than
MOBILEGL_TRANSPORT=monolith, so the default arm's environment stays
byte-identical to what it was before this option existed: a control that
changed when the option landed would not be one.
THE SERVER PATH CANNOT COME FROM THE HOST. Every other knob can, but this one
names a file that must be EXEC-ABLE, and on Android there is exactly one such
place: an APK's lib/<abi>/. W^X has forbidden the app's own data dirs since
API 29, and the packager only puts a file in lib/<abi>/ if it is named
lib*.so - which is why the server executable wears that name, and what P0
spike A proved on two devices. nativeLibraryDir contains an install-time
hash, so no host-side script can spell the path; the process about to launch
the server is the only one that can. TraceReplayActivity resolves it, and
only when the caller actually asked for spawn.
AN EXPLICIT MOBILEGL_IPC_SERVER_PATH STILL WINS. A caller that set one is
pointing somewhere deliberately - at a pushed build, say - and silently
replacing it would make that knob untestable on the one platform where it
matters most.
The APK must be built with -Pmobilegl.buildDisaggregated=ON or none of this
is reachable: without it ConfigLoader has no transport parser, accepts the
value, ignores it (CONTRACT-P5 rule 5), and the run is monolith under a name
that says spawn. The --transport help says so where somebody will read it.
It was one case on one backend under one transport: OpenRA, DirectGLES,
inproc. It is now every CI case, both backends, inproc AND spawn - 154 CI
entries, 156 local ctest entries - because every defect the spawn work turned
up was a question about the SERVER's process and not about any one trace or
either backend.
THE DirectVulkan ARM. tools/trace_replay/CMakeLists.txt carried "a
DirectVulkan arm would be measuring a server nobody has written yet". True
when P5 wrote it; false since P5f/P7 landed Magma's server consumers and its
run-ahead readiness gate. Leaving it would have shipped a split shape whose
second backend nothing ever ran - the same class of hole as a lane that runs
monolith under a name that says split. Magma now brings up a server process
of its own and OpenRA retraces across it at ssim=1.000000, which is only
possible because this branch also taught the child to load its config: before
that, a DirectVulkan session brought up a DirectGLES server and the two
halves disagreed about which backend the capability mask describes.
`split` BECOMES AN OPT-OUT. It began as an opt-in naming one case, because
one case was the work. Marking 39 cases `"split": true` would carry no
information and would reinstate the hole the key was written to close, only
mirrored: a case added later would get the monolith arms and be silently
absent from the split ones, and absent is the one state nothing reds on. A CI
case is now in the subset unless it says `"split": false`, which is a
reviewable claim that a trace cannot cross a role boundary.
THE CI MATRIX GAINS A THIRD DIMENSION. The job took {backend, case} and
hard-coded MOBILEGL_TRANSPORT=inproc in its own run block, so `spawn` had no
way into CI at all; the .SPAWN ctest entries existed only for a local build.
It is {backend, case, transport} now, the backends are the case's own
ci_backends rather than a hard-coded DirectGLES, and the artifact names carry
the transport or the two arms of one {backend, case} would overwrite each
other's uploads.
inproc STAYS AS THE CONTROL. Same library, same codec, same applier, same
picture; the only difference is which process the server role runs in.
Running only spawn would leave "did the transport break it?" and "did the
phase break it?" answerable only together - which is the question every
failure in this phase has turned on, including the SIGSEGV that D1 explained.
BOTH NEGATIVE CONTROLS FOLLOW THE ARM. retrace_pull_library_control.sh and
retrace_drop_draw_control.sh each exported MOBILEGL_TRANSPORT=inproc
themselves, so on a spawn job they would have gone on proving something about
the other arm while spawn ran unguarded. They read SPLIT_TRANSPORT now, and
default to inproc so a caller that sets nothing behaves exactly as before.
scripts/ci/control_smoke_test.sh: 22 passed, 0 failed against the stubbed
ctest, including the two modes that matter most - a red whose SSIM never fell
and a knob that armed and dropped nothing.
The spawn arm needs a second binary and the inproc arm needs none, so the job
places libMobileGLServer.so only on the spawn arm and a missing one is a
named failure there rather than a LaunchServer refusal 78 jobs deep.
Measured locally as this lands: 39 of the 78 SPAWN entries complete, all
green. The rest are still running.
OpenRA.DirectGLES.SPAWN is green: ssim=1.000000, mismatchPixels=0, zero
Fatal{ lines, against a server in a process the client started by name. The
inproc SPLIT arm stays beside it as the control, so "did the transport break
it" and "did the phase break it" remain separately answerable.
Five defects stood between the handshake and that picture. Each one was
silent in its own way, and none of them looked like what it was.
1. THE DOORBELL COULD NOT WAKE ITSELF. SocketDoorbell's one-fd form sends on
the end it polls, so a write is delivered to the PEER - correct for waking
the other process, useless for waking a thread in this one. The server's
control pump posts into the apply thread's mailbox and must ring the bell
that thread parks on. Symptom: every eglInitialize crossed, landed in the
mailbox, and timed out at 5 s. The two-fd form (park on [0], notify on [1])
is restored here, and the bell handover goes from two descriptors to THREE
- the client needs the same split for the same reason. Seven offers now.
2. InitCapabilities HAD NO WIRE KIND. CONTRACT-P6 §2 predicted this exactly
("the request has a live client caller and the codec refuses to encode
it"). SurfaceOpKind gains 11, append-only; the decode range's upper bound
moves with it, or the new tag reads as out-of-range and surfaces as
Fatal{ProtocolCorruption} rather than the missing row it is. The op's name
loses its InprocOnly suffix, which stopped being true here.
3. THE CHILD LOADED NO CONFIG AT ALL. mobilegl_server_main calls
InitServerRoleForSpawn directly, and MG_ConfigLoader::Init is a step of
MobileGL::Initialize - so every MG_Config value in the server was its
static default. MOBILEGL_BACKEND_TYPE survives the launcher's scrub on
purpose and was read by nobody: a DirectVulkan session would have brought
up a DirectGLES server and then disagreed with its client about which
backend the capability mask describes.
4. AND THEREFORE Transport READ AS Monolith, which CONTRACT-P6 §3.1 (D1)
forbids in as many words. a6 measured the cost: 226 live lines test
`Transport != Monolith` to select the SERVER arm, 148 in MG_Backend.
Monolith flips all of them to frontend glue in the one process with no
frontend. Observed precisely as predicted - UnitTexturesByHandle() answered
false, Clear took the legacy arm that dereferences borrowed FRONTEND slot
pointers, and the apply thread took a SIGSEGV inside SyncNeccessaryTextures
on the first Clear record of the trace. It is pinned in-process rather than
through the environment because the environment is where it must NOT be:
LooksLikeAClientEnvironment exits 65 on a surviving MOBILEGL_TRANSPORT, and
that check is anti-recursion catch (b). Dial, not Transport, is that axis.
5. THE LOG WAS CORRUPT, NOT MERELY INTERLEAVED. Two processes opened the same
MOBILEGL_LOG_FILE_PATH with "w" and each carried its OWN file offset, so
they overwrote each other's bytes - half-lines like `ote client: CapsMirror
generation 1 adopted`, and the server's whole startup block vanishing under
the client's later writes. This cost real diagnosis time twice, because a
missing line read as a code path not taken. O_APPEND now; the client still
truncates once so a fresh run is not a pile of old ones, and the server
never does - it would delete the very startup lines a failed session needs.
run_trace_case.cmake's Fatal{ census reads exactly this file, so it was
also reading a lie.
The retrace runner's split assertions become transport-aware: one row per
transport it admits, and a transport with no row is a FATAL rather than a
fall-through, because the fall-through is the accident the block exists to
prevent. The spawn row carries a SECOND sentence and it is the stronger half
- ConfigLoader's marker proves the value RESOLVED, while `spawn ARMED - the
server role runs in pid N` is written only after the launch, the connect and
the handshake all succeeded, and carries a pid that is not this process's.
inproc resolves its own marker while running the server role on a thread
here; nothing on that path can write this one.
G14: one test name added (TheEleventhFramedOpIsInitCapabilitiesAndItCrosses-
TheWire), none removed. The ten-op table keeps its name and its scope rather
than being renamed to eleven.
Two unit failures predate this change and are environmental in this tree:
PipeCatalogue.FrontendNeverTakesAnApplierAddress (the frontend source root
resolves empty) and SessionHandshakeTest.TheAbiFingerprintChangesWhenAnyOf-
ItsInputsDoes (GIT_COMMIT_HASH_SHORT is empty here, which a6 already recorded
as red in this configuration).
Stage updates to adopted GPU-resident buffers on the command timeline instead of overwriting memory that earlier draws still read. Wait for submitted copies as well as pending commands before CPU readback.
Commit coherent mapped writes before Android trace buffer copies, and retire buffer shadows on deletion so copies see current vertices and name reuse cannot leave dangling dirty-shadow entries.
Validated draw ordering, submitted-copy readback, traced buffer copies, and mapped-buffer deletion/name reuse on Redmi Adreno 830. Minecraft 26.3-rc-3 Magma passed movement, HUD, and menu checks and exited normally; the new trace parsed all 64,410 frames without warnings.
- bench.sh's pin_freqs writes /proc/ppm and /proc/gpufreq, which exist on neither 35d0befa
(SM8750) nor 3B159D009VZ00000 (MT6993 dropped both for /proc/gpufreqv2); the guard the
PROFILE_VERIFIED key exists for was about to be defeated on the device its own comment
guessed was safe
- pin_device.sh pins big/little/GPU through the nodes each device actually has (Xiaomi:
policy6 1958400 / policy0 1555200 / kgsl pwrlevel 0; Oppo: policy4 2000000 + policy7
2000000 / policy0 1600000 / gpufreqv2 fix_target_opp_index 0), checks only against its own
pins because ColorOS moves stock maxima by itself, and refuses to call a zero-key read a verdict
- both profiles are PROFILE_VERIFIED=1 on 30 s pinned windows with zero drift; the evidence and
the two things not verified (Oppo GPU held at DVFS-request level only, no full bench window)
are in docs/Disaggregated/devices/pin-verification-2026-09-07.md
- bench.sh and session.sh are invoked as ./tools/device_bench/bench.sh in their own README
and are the harness for the paired two-device A/B the GO/NO-GO asks for; a previous commit
in this package dropped the bit and every check invoked them through bash, so nothing saw it
swung0x48