compat_pread mapped every non-EOF ReadFile failure to EIO, so the field report
was always the same three words: "Input/output error". #307 then burned three
rounds of guessing across three people — storage? contention? alignment? —
because the actual GetLastError code never appeared anywhere.
compat_pread now stashes the code in a per-thread slot and pread_full appends
it to the failure line:
pread qs: Input/output error (off 780592, 0/8192 bytes, WinErr=1450)
That one number is the difference between "insufficient system resources"
(1450 -> memory pressure), "sharing violation" (32 -> AV interference),
"device not ready" (21 -> the T: drive itself) and a dozen other distinct
diagnoses. Diagnostic only: no behavior change, no retry policy — that
discussion lives in #361 and should be settled AFTER the first report tells
us which error we are actually retrying.
Linux path untouched byte-for-byte; the Windows compile is certified by the
check.yml MSYS2 job.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The DSA lightning indexer selects the top-index_topk (2048) context keys to
attend to by finding the threshold = keep-th largest attention score. It
previously full-qsorted all nk scores per layer per token (O(nk log nk)) just
to read one pivot value, then scanned the original array in position order to
build the kept set.
Replace the qsort with partial_select_desc (Hoare quickselect, median-of-three,
descending): O(nk) average to partition the keep largest into a[0..k), then the
threshold is min of that block. The two position-order scans (>thr then ==thr)
are UNCHANGED, so the kept-position set is bit-identical -- a stronger contract
than #335's sampling heap (which was multiset-only because the heap was unstable
and changed accumulation order). The quickselect pivot IS by definition the
keep-th largest, so the new threshold equals old tmp[keep-1] exactly.
Measured (bench_dsa_select, keep=2048, median of 2000 reps):
nk=2049: 119us -> 5.7us (21x)
nk=8192: 626us -> 43us (15x)
nk=32768: 2.8ms -> 0.28ms (10x)
nk=65536: 6.6ms -> 0.47ms (14x)
The gap widens with context (linear vs n-log-n). DSA only fires past index_topk,
so this is precisely the long-conversation regime where decode latency matters.
Adds test_dsa_select (in TEST_BINS): 129 cases asserting element-wise identical
kept-set vs an independent qsort reference across shapes (random, peaked,
sorted, reverse-sorted, tie-plateau, all-equal) and edges (keep==1, keep==nk).
Also directly checks the partition invariant.
Adds bench_dsa_select (on-demand, NOT a gate): reproduces the table above.
test_topp proves correctness; bench_topp measures the latency claim. It re-implements
the OLD dist_build (full-vocab qsort) inline on a private buffer and times it against
the REAL new dist_build over identical inputs in one process: V=151936, temp=0.7,
3 shapes (realistic / uniform / plateau) x 4 nuc values (0.5/0.9/0.95/0.99), 2000
timed reps each, median reported. Deliberately NOT in TEST_BINS -- it's a microbench,
not a gate. Build on demand: make tests/bench_topp && ./tests/bench_topp
dist_build() sorted the entire 151936-entry vocab by probability (qsort) on every
sampled token whenever 0 < g_nuc < 1 — the serve default — and again per draft
position under rejection sampling. Measured cost: 5.6-8.0 ms/call; the actual work
is finding the few-hundred-token head whose cumulative mass reaches g_nuc.
Replace the full qsort + linear scan with a max-heap partial select:
- Floyd heapify g_pidx over V by descending g_pbuf prob (O(V), cache-friendly)
- pop winners to the array's high end until cum >= g_nuc (k * O(log V))
- the remaining heap prefix IS the tail -> zero it, renormalize the head
Winners land in g_pidx[out..V-1] in descending order, so s2 accumulates in the
same order as before -> head is unchanged on tie-free shapes (ties were already
unspecified under the unstable qsort). All four dist_build/dist_sample contract
properties hold: g_pbuf stays id-indexed, g_pidx stays internal, the tail is
fully zeroed, the head renormalizes to 1.
No API change, no caller change, no new globals.
c/tests/test_topp.c (new): drives the REAL dist_build via the include-glm.c
pattern against an independent double-precision reimplementation of the OLD
algorithm. 123 cases: 6 sizes (1..1519) x 5 shapes (uniform/peaked/geometric/
plateau/sharptail) x 4 nuc values, plus the g_nuc>=1 guard-off paths and V=1.
Tie-free shapes compare head values within 1e-6 rel (float vs double renorm
noise); tie shapes compare value-multisets. No scratch files -> builds clean on
Windows MinGW without the unmerged mkdtemp shim (#352).
test_stops.c uses POSIX mkdtemp() to make a scratch dir in the CWD, but
MinGW-w64 does not declare mkdtemp, so the test failed to compile on the
Windows job - and only there:
tests/test_stops.c:73:9: error: implicit declaration of function 'mkdtemp';
did you mean 'mktemp'? [-Wimplicit-function-declaration]
make: *** [Makefile:318: tests/test_stops.exe] Error 1
That halted `make test` at the C-test stage on Windows (test_uring is
correctly Linux-only, so test_stops was the only blocker).
Added a compat_mkdtemp shim to compat.h, following the file's existing
convention (every platform difference lives there; the .c stays clean):
_mktemp fills the trailing X's in place (same contract as mkdtemp), then
_mkdir creates the directory. Also added <direct.h> for _mkdir. On Linux
compat.h is a complete no-op, so POSIX mkdtemp is untouched there.
Verified: test_stops builds clean on MinGW and all 5 sub-cases pass:
tokenizer special-flag parsing, config/generation_config eos union,
no-generation_config fallback, both-configs-mutilated tokenizer sweep,
and the T=NULL validation path.
A clean 'make glm' on MinGW emitted exactly two warnings, both real:
1. compat.h:240 - ignoring pragma comment [-Wunknown-pragmas]
#pragma comment(lib, "psapi.lib") is an MSVC directive; MinGW/GCC
warns about it. Guarded with ifdef _MSC_VER - MinGW links psapi via
-lpsapi (already in the Makefile), MSVC keeps the pragma.
2. glm.c:1210 - g_numa_nodes defined but not used [-Wunused-variable]
g_numa_nodes is only read/written inside ifdef __linux__ blocks, so on
every non-Linux build it is a static that is never used. Moved the
definition under the same __linux__ guard; nothing references it off-Linux.
Verified: rm -f *.o glm.exe && make glm -> 0 warnings, 0 errors.
The hot-thread tuning sets OMP_WAIT_POLICY=active and caps libgomp's spin
with GOMP_SPINCOUNT=200000. LLVM libomp reads NEITHER: under active policy it
sets KMP_BLOCKTIME=infinite, so once the answer ends and the engine parks on
stdin, the whole OMP team spins forever — ~100% per thread, the 3000% figure
reported on FreeBSD 15.1 in #341 (clang/libomp is the default toolchain
neighborhood there; the same applies to macOS builds).
KMP_BLOCKTIME=200 keeps the team hot for 200 ms after each parallel region —
plenty to bridge back-to-back per-expert matmuls — and then sleeps it.
setenv with overwrite=0, so a user-provided KMP_BLOCKTIME still wins, and
libgomp builds ignore the variable entirely: on GCC toolchains this commit
is a no-op by construction.
Not reproduced locally (this box is gcc/libgomp and idles clean); shipped as
the mechanism-matching candidate fix with a request on the issue for the
reporter to verify on dev and to name their OpenMP runtime (ldd | grep omp).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
No more manual pkill: cmd_serve writes a pidfile, cmd_stop finds the server
(pidfile, then /proc cmdline) and its engine (comm glm/exe/olmoe with SERVE=1
in environ — the engine re-execs for OMP tuning so its comm is 'exe', which is
why every 'pkill -x glm' in history killed nothing). SIGTERM, wait, SIGKILL.
--dry-run lists targets without acting. First real use took down a live
serve+engine pair cleanly and released 16 GB.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
(cherry picked from commit 41a872c331a2a0a8655699e0171c68dd2bcda186)
The cold-chat cost, measured on this box: every `coli chat` spawns a private
engine (34-136 s of resident load) and starts with an empty expert cache (hit
4% cold vs 55% warm). Quitting throws both away.
`coli chat` now probes localhost:8000 first (~1 ms when nothing listens) and,
if a `coli serve` answers, runs the REPL over plain OpenAI SSE against it:
stdlib urllib only, engine byte-protocol untouched. --attach [URL] forces it,
--no-attach restores a private engine. reasoning_content keepalive pings are
filtered; :reset starts a new conversation client-side (the server's KV slots
reuse prefixes per conversation on their own).
Verified against a mock SSE server (pings ignored, markdown rendered, :reset,
clean exit) and against the real 744B model: two consecutive sessions, second
attach instant with zero reload — the engine stayed resident at 15.7 GB across
both. Honest limit: warmth carry-over BETWEEN different conversations is small
here because cap=3 slots/layer is a short memory; the structural wins are the
load never being repaid and same-conversation continuation.
LOCAL ONLY for now — not pushed, per the current working rule.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
(cherry picked from commit aa406ccab8a4501b924bc3a9f4725dd1d18a685d)
The slow-filesystem warning fired for any model path under /mnt/, which
false-positives on native-Linux mounts (ZFS/ext4/xfs/NFS) that commonly
live there. Check the actual filesystem type via statfs() against the 9p
superblock magic (0x01021997) instead, so it only warns for a genuine
WSL 9p mount. Linux-only (statfs); no behavior change on other platforms.
Same fix pattern as test_stops: mkdtemp with a CWD-relative template
(MinGW resolves Windows paths; /tmp is not one), and the fork/pipe/
truncate-based truncation subtest compiles only where those exist —
Windows still runs the cross-platform chunk-loop content check.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Two latent bugs in every st.h reader, both hit in the field:
- a single pread caps at ~2^31 bytes on Linux, so any tensor past
2.1 GB (bf16 embed/unembed tensors of large models qualify) came
back silently truncated with perror printing '... : Success'
(errno untouched by a short read) — the same misleading-error
symptom glm.c fixed for its own reads in #236;
- no EINTR retry.
st_pread_full loops in ST_PREAD_CHUNK pieces (1 GB default, override
for tests), retries EINTR, and reports offset + progress on failure.
All five read sites converted; behavior on well-formed files is
byte-identical (GLM oracle re-verified on this branch: 32/32).
tests/test_st_pread builds with -DST_PREAD_CHUNK=7 so a 96-byte tensor
exercises the multi-chunk loop, and forks a child against a shard
truncated after st_init (init's static bounds check means the pread
path only fires when a file shrinks under a live handle) asserting
exit(1) with a 'short read' message and no 'Success'.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
My test_stops.c called mkdtemp("/tmp/coli_stops_XXXXXX"). These binaries are
built by MinGW into NATIVE Windows .exe files, which resolve Windows paths —
"/tmp" is not one, so mkdtemp failed ENOENT and `make check` went red on the
windows job the moment #143 gave us cross-platform CI.
Now a relative template in the CWD, which is what test_compat_direct.c already
does (`#define TMPF "test_direct.tmp"`). test_uring.c uses /tmp but is
Linux-only by construction (Makefile guards it behind $(LINUX)); I copied the
wrong neighbour.
Worth being precise about what this was, because the red job looked scarier
than it was: Windows is fine. `make check` built the engine, ran the whole C
suite, and passed everything else — test_i4_grouped, kv_alloc, compat_direct —
before tripping on my temp path. The CI caught a bug in the test, not in the
port. That is #143 earning its keep on day one.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
`(uintptr_t)p+n+4095 & ~(uintptr_t)4095` is CORRECT — `+` binds tighter than
`&` in C, so the rounding happens before the mask, which is what was meant.
But gcc -Wall warns (`suggest parentheses around '+' in operand of '&'`), and
this repo builds clean at -Wall -Wextra. Warning-free is a property worth more
than the two characters it costs to keep: it is what makes a NEW warning
visible instead of scrolling past in a wall of noise.
No behaviour change; the emitted code is identical.
Co-Authored-By: ZacharyZcR <#313>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Feeds reference tokens through the normal step() decode path and reports
NLL/ppl + hit rate + tok/s + RSS. Inert unless PPL=1; default path
untouched (12/12 vs ref.json verified with patch applied). Cross-checked
vs HF transformers bf16 on identical token ids: 12.11 vs 12.25 ppl (#108).
GLM-5.2 MLA uses interleaved (DeepSeek-style) RoPE, which the C engine
implements. transformers < 5.11.0 applied split-half (Llama-style) RoPE in
GlmMoeDsa* instead; an oracle built on those versions silently drifts and the
engine scores 25/32 instead of the documented 32/32 (#281). Weights come out
identical across versions -- only the forward pass differs -- so a too-old
transformers produces an invalid ref_glm.json with no warning.
Add a version gate at the top of make_glm_oracle.py: hard sys.exit with an
actionable message citing the issue and the upgrade command. Reads the version
from importlib.metadata (authoritative installed-dist version) rather than the
mutable transformers.__version__ attribute -- the latter gets reset by the lazy
model-class import (from transformers import GlmMoeDsaForCausalLM), so reading
it after that import is unreliable. The gate runs before the heavy import and
falls back to the attribute only if the dist metadata lookup fails (editable/
src installs).
Validated end-to-end on transformers 5.13.1: script runs, ref_glm.json and
model.safetensors are byte-identical to the shipped versions, engine scores
32/32. With the floor raised to (5,14) the gate blocks with the expected
message.
The engine armed its stop tokens from config.json's eos_token_id and nothing
else. That trusts metadata written by third-party conversion tooling, which is
a thing we already know goes wrong: the README documents a mirror shipping
int4 MTP heads that silently give 0% draft acceptance. GLM-5.2 declares THREE
eos ids (<|endoftext|>, <|user|>, <|observation|>); a converter that rewrites
config.json with a reduced list leaves the engine stopping on fewer tokens
than the model emits, and the missed ones get detokenized and printed into the
chat as literal text while generation runs past the end of the turn.
Two independent defenses:
- eos_token_id is now unioned with generation_config.json, which is
HuggingFace's authority for generation (config.json often carries a
partial legacy copy). An extra stop is harmless; a missing one is not.
- every added-token the TOKENIZER marks "special":true is armed as a stop,
whatever the configs say. Those are control tokens (<|user|>, <|assistant|>,
<sop>, [gMASK], the image/video/audio markers) and are never legitimate
content in a reply -- GLM itself lists three of them as official eos.
<think>/<tool_call>/<arg_key> are "special":false and are deliberately NOT
swept up: they are real output. tok.h was parsing added_tokens but throwing
the "special" flag away, so the distinction wasn't available to anyone.
On the real per-row checkpoint this takes the armed set from 3 to 18:
[stop] 18 stop tokens: 154820 154827 154829 154821 ... (15 from the
tokenizer's special set)
Honesty about scope: this is hygiene for a class of bug, NOT a fix for the
trailing-junk report on #298 that prompted it. I hypothesised @woolcoxm's g64
checkpoint had lost eos ids in conversion; he checked, and it hadn't -- his
config arms all three correctly. The emit path is also innocent: is_stop() is
checked BEFORE emit() at every one of the four call sites (4215, 4256, 4908,
4987), so a correctly-armed stop cannot be printed. His trailing junk is still
unexplained and is more likely quantization noise. What this commit buys is
that a checkpoint we don't control cannot leak control tokens into a reply,
which was true before and is not now.
tests/test_stops.c covers both defenses: the union, a missing
generation_config.json, BOTH configs mutilated (the tokenizer still stops all
five control tokens while leaving <think> alone), and T=NULL (the validation
path keeps config-only behaviour).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@woolcoxm's matmul_i4_grouped_pair reads x once instead of twice for the
gate+up pair. Verified here against his branch (86e91b1 merged onto dev):
correct to ~2e-8 relative vs the double reference, and BIT-EXACT against two
separate matmul_i4_grouped calls on aligned shapes -- which is the shape the
real g64 checkpoints have (I = 2048 / 6144, gs = 64). His kernel is good.
Guarded behind COLI_HAVE_GROUPED_PAIR since the function only exists on that
branch; add -DCOLI_HAVE_GROUPED_PAIR to the test's Makefile rule when #298
lands and the pair cases activate.
The checks are deliberately asymmetric, and the reason is worth recording.
Bit-exactness is asserted ONLY when I % gs == 0: there every group is covered
by the AVX2 body, whose accumulation order matches the unfused kernel, so any
difference is a real bug. With a partial last group the tail falls to scalar
code and the compiler may contract/reassociate the fused body differently,
producing ~1e-7 differences -- rounding, not logic. My first version demanded
bit-exactness everywhere and duly "found" a bug in his kernel that did not
exist; the tell was that only `up` differed and never `gate`, which is FP luck
rather than a code path. Correctness is checked everywhere against the double
reference; identity only where identity is actually implied.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
matmul_i4_grouped is the reference the CUDA fmt=4 port (#298) is expected to
reproduce, and it had no test of its own. @woolcoxm is currently debugging a
CUDA backend against an oracle nobody had verified, which is two moving
targets at once -- and he can't cross-check on CPU, since a 5-prompt run
takes 8 hours on the 744B model.
This checks matmul_i4_grouped against a plain-C reference that dequantizes
nibble -> (v-8)*scale[i/gs] and accumulates in double, over 11 shapes: I a
clean multiple of gs, a partial last group (the glen clamp), odd I (the
scalar nibble tail), gs > I, gs=16/64/128, S>1, and the nibble extremes
0x00/0xFF -- which decode to -8/+7 because the format is offset-encoded, not
two's complement. Reading that backwards turns 15 into -1 and looks like
data-dependent noise rather than a bug.
All 11 shapes match to ~1e-8 relative, so the CPU kernel is exact and can be
trusted as the reference.
One note on the tolerance, because the first draft of this test got it wrong
and "found" a bug that wasn't there: the error is compared against the sum of
|terms|, not against |result|. A dot product of signed terms can land near
zero through cancellation, and then a 1e-6 absolute error -- ordinary f32
accumulator precision -- reads as a 1e-3 relative one. A wrong scale index or
a wrong group boundary shifts the result by a fraction of the terms, so it is
still caught at 1e-6.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
- Fix queue flush race: clear is_queued under mutex only; never move
pilot_w backwards (would break r<=w ring-buffer invariant). Worker
skips stale entries via new is_queued guard at start of pilot_realload
- Add early-exit in pilot_realload when is_queued==0 (entry flushed
between enqueue and worker pickup), preventing unnecessary loads
- Fix misleading EMA struct comment: momentum_logits is used only by
the PILOT prefetcher, not blended into actual MoE routing decisions
- Fix Slot pinned comment: 'never evicted' was too strong; clarify that
pinned slots may be displaced under extreme all-pinned cache pressure
- Use st_read_f32() for scale tensor (.qs) instead of st_read_raw() to
handle potential future BF16/F16 dtype changes robustly
make_glm_oracle.py wrote glm_tiny/model.safetensors and glm_tiny/config.json
without creating the directory first. safetensors.save_file writes a temp file
inside the target dir before the atomic rename, so on a clean checkout (no
pre-existing glm_tiny/) it aborts with an opaque error:
SafetensorError: Error while serializing: I/O error:
The system cannot find the path specified. (os error 3)
at path ".../glm_tiny/.tmpXXXXXX"
The directory only ever existed because it was left over from a previous run,
so the first-ever `python tools/make_glm_oracle.py` fails for every new user
following the README's verify step.
Create glm_tiny/ with Path.mkdir(parents=True, exist_ok=True) before the save
branch — covers the fp8 path, the bf16 path, and config.json. Path is already
imported; no new dependency, no change to the CPU build.
- Fix LRU fallback: when all evictable slots are in-flight, find oldest
non-in-flight slot (pinned ok) before falling back to slot 0
- Fix pin_hot_experts: guard enqueue behind g_pilot>0, call
ensure_pilot_worker_started(), and set is_queued flag to prevent
duplicate in-flight loads from pilot_prefetch()
- Fix token counting: increment token_count/freq_token_count by S (batch
size) instead of 1 so prefill tokens are counted accurately and warmup
threshold triggers at the right time
- Fix ENV VARS header: document PILOT=0-3, SMOOTH, CONF_LIMIT; remove stale REBAL entry
- Fix per-layer EMA: apply routing momentum to all layers (not just layer 0) with correct offset
- Fix in-flight slot race in expert_get: LRU eviction now skips slots with eid==-1 (being loaded)
- Fix in-flight slot race in pilot_realload: same fix, prevents concurrent writes into active slot
- Fix idx[] buffer overflow: clamp max_cand to 128 before E in pilot_prefetch
The dashboard's wall-time stack assumed ewait = felt I/O stall and
edisk = overlapped read service, but the engine measured neither:
t_ewait was declared and reported yet never incremented (the blue
'I/O wait' segment always read 0.00s), while t_edisk accumulated on
the COMPUTE thread — blocking OMP loads, PIPE dispatch, pipe_wait
spins — i.e. exactly the felt stall. The UI excluded it from the
stack as 'overlapped', so the whole disk stall landed in 'Other'
(e.g. 46.9s Other vs 45.3s disk on a 54.1s turn).
Now the semantics match the contract:
- t_ewait accumulates the compute-thread stall (blocking loads,
PIPE dispatch, pipe_wait spins) and feeds the in-stack I/O wait.
- Disk service is real: expert_load is timed on whichever thread
runs the read (PIPE workers, OMP loaders, pilot) into an atomic
ns counter (g_edisk_ns) — thread-seconds, overlapped with compute.
- prof_report's I/O share and verdict use the felt wait only, and
the expert I/O line prints 'read service / felt wait' so the
wait:service gap shows how well PIPE is hiding the reads.
PROF wire format, /profile JSON and the web UI are unchanged —
the dashboard's existing assumptions are simply true now.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dd4hHD2Dsvgr7VAwEVFqWK
The engine already tracks where each turn's wall time goes (expert-disk
service, I/O wait, expert matmul, attention, lm_head) — it just only spoke
at exit or under PROF=1. Stream it instead:
- glm.c: mux serve emits a per-turn "PROF" protocol line next to TIERS/HITS
(window deltas per request, same convention as the STAT hit%); the phase
window base is now always captured (a few loads per request).
- openai_server.py: parses PROF into a 120-turn rolling window and serves it
at /profile (read-only, same trust level as /health).
- web: new Profiling tab — stat tiles (tok/s, wall, tokens/forward, disk
service), wall-time composition bars for the last turn and the window,
per-turn throughput and stacked phase columns with hover readouts, and a
table of recent turns. Disk service is shown apart from the stack: it
overlaps with compute, so only the I/O wait the compute thread felt counts
inside wall time. Phase colours are a CVD-validated set with gaps + legend
+ table so identity never rides on colour alone.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WhTmF8yvEBgSkUKSVfZF7P
run_serve_mux (SERVE_BATCH, used by openai_server.py / coli web) completes
requests in mux_done, so the run_serve per-turn hook never fired there.
Snapshot the window where hits0 is taken, record batched-forward latency
around step_decode_batch, report on stderr at DONE. With KV_SLOTS>1 the
window shares batched forwards across slots — same convention as the
existing STAT hit%.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TCBNCciBaHea41QmidLUMn
Answers 'where does it slow down on THIS machine with THIS config' so users
can tune RAM_GB/PIPE/DIRECT/PIN for their hardware without folklore:
- startup header: CPU/cores/RAM/backend + effective knobs (cache cap, pin,
DRAFT/PIPE/DIRECT/MMAP/IDOT/DSA/PILOT/CACHE_ROUTE) — every saved log is
self-describing when comparing runs across configs or machines
- per-forward decode latency ring (32k) -> p50/p90/p99/max, plus a tail
diagnosis when p99 >> p50 (cold-cache expert loads)
- expert I/O accounting at the pread/mmap-touch sites: GB fetched, MB/token,
GB/s, hit rate, loads/token, pinned/LRU tier fill
- phase shares of wall time and a plain-language verdict naming the knob
most likely to move tok/s (I/O-bound vs compute-bound vs attention-bound)
- reports after REPLAY / PROMPT / oracle runs (stdout) and per turn in serve
mode (stderr; stdout stays the framed protocol)
Additive only: with PROF unset every mode's output is byte-identical.
hwinfo_emit's /proc probe is factored into hw_probe() and shared.
Validated end-to-end on a tiny-random unquantized fixture (REPLAY, PROF on/
off, RAM_GB squeeze flips hit 96.9%->26.6% and the verdict follows);
make check clean, 0 warnings.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TCBNCciBaHea41QmidLUMn
Both sentinels in c/coli (READY and END) end with \n. Under CRT text
mode on Windows, printf() translates \n to \r\n, so the engine emits
\x01\x01READY\x01\x01\r\n. The Python coli wrapper checks
endswith(SENTINEL) which expects bare \n — the match never fires and
chat hangs forever.
_setmode(fileno(stdout), O_BINARY) at engine startup switches stdout
to binary mode so \n passes through unchanged. This matches the
belt-and-braces reasoning already in compat.h:88 (O_BINARY for file
I/O). The fix is defense-in-depth: on the documented w64devkit/MinGW
build path, CRT text mode may or may not apply depending on how the
terminal is attached, so this ensures correctness regardless.
Note: I was unable to compile-test this on the full codebase because
glm.c uses POSIX-only symbols (mmap, madvise, select, fd_set, struct
stat/fstat) that are unavailable on Windows without platform guards.
The codebase compiles on Linux (Ubuntu 24.04, GCC 13) and macOS
(Apple clang). Windows compilation requires wrapping those POSIX calls
in #if defined(__APPLE__) || defined(__linux__) || defined(__FreeBSD__)
guards — I opened this as a separate concern for the maintainer.
@bokiko benchmarked the feature on three hosts and found every setting is
either no faster or no longer coherent. Reproduced here on a 25 GB box, and
the numbers are worse than "a quality/speed tradeoff":
- budget=8 -> hellaswag 30% vs 90% with it off (25% is the chance floor)
- budget=4 -> decode is literal noise ("The **1...: s2151:")
- MTP acceptance 0%. Which experts survive the cap depends on cache
residency at the moment of the forward, so draft and verify do not
compute the same function -- the invariant #294 just established for
#163, violated through cache state instead of kernel dispatch. SPEC_PIN
cannot fix that and should not try: it is feature semantics, not
dispatch.
- 0.13 tok/s vs 0.30 baseline, while loading 14.66 experts per layer
against a topk=8 baseline. The cap does MORE disk I/O than not using it.
"~335 GB I/O saved" counts dropped experts, not bytes not read.
EXPERT_BUDGET>0 is now ignored unless EXPERT_BUDGET_EXPERIMENTAL=1, with the
measurements printed. The code stays compiled and developable: MoE-Spec
(arXiv 2602.16052) is not a wrong idea, this implementation just has no
point where it is both faster and correct. Re-enabling it by default needs a
quality number next to every speed number.
Also gates the cap to decode (S<=4), @woolcoxm's fix from #292/#298: during
prefill the batch union is 30-100+ experts, and capping to 4-8 drops most of
them, corrupting the hidden state and therefore the KV cache. Necessary but
not sufficient -- the run above already includes it.
Removes issue_budget.md, issue_diskio.md and issue_grouped_quant.md: design
notes in the repo root, unlinked from any README, whose only user-facing
content was "EXPERT_BUDGET=6-8 -- good speedup, minimal quality loss" and
"+83% decode at budget=4". Measurement says otherwise, and they were the
only thing on main telling anyone to switch this on. They stay in history.
Reported-by: bokiko <#303>
Co-Authored-By: woolcoxm <#292>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Two silent failures that compound into "[engine terminated]" with no cause.
cap_for_ram() floors the expert cache at cap=1. When resident+slack have
already blown the budget, avail is negative and capmax would be 0 -- "I do
not fit in your budget". Flooring it to 1 and carrying on turns "I do not
fit" into "I overshoot", which is precisely the mid-generation OOM-kill the
function exists to prevent: it printed "projected peak 25.1 GB" against a
22 GB budget and started anyway. Now it says so, names PIN_GB when that is
what inflated the resident set, and refuses to start when the peak also
exceeds the memory actually available on the machine (COLI_RAM_OVERCOMMIT=1
overrides).
The kernel kills with SIGKILL: no error, no log, stdout just closes. coli
read that EOF and printed "[engine terminated]" without ever reaping the
child, so an OOM-kill was indistinguishable from a clean exit -- the report
in #305 (Debian 12, dies mid-generation, no message). engine_diag() now
reports the signal or exit code, names the OOM-killer when it was SIGKILL,
and shows the tail of the engine's stderr.
Reported-by: Ne00n <#305>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
One HF 504 killed the whole bench. Now: load_dataset retries with
exponential backoff (hf_hub resumes partial downloads from cache); a task
that still fails is skipped instead of killing the rest; JSONLs are written
atomically (coli only checks existence, so a truncated file from an
interrupted run would block re-download forever); coli bench drops
still-missing tasks with a warning and refuses to run eval with none.
Co-Authored-By: Claude <noreply@anthropic.com>
Apple clang 16 (clang-1600.0.26.6) defaults objective-c++ to a pre-C++11
dialect, so the raw string literal holding the Metal shader in
backend_metal.mm fails to parse:
backend_metal.mm:12:29: error: use of undeclared identifier 'R'
backend_metal.mm:13:10: fatal error: 'metal_stdlib' file not found
Pinning gnu++17 on METALXX fixes 'make glm METAL=1' and 'make metal-test'.
Verified on macOS 15 / M4 Max: both targets build and all metal backend
tests pass.
JustVugg