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docs(benchmark): log post-inlining state + bootstrap refresh

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Records the cumulative effect of the IsLarge fix, pointer-promotion
codegen, inline-candidate analyser, and leaf-function inlining
landed this session.  Bootstrap binary refreshed in-place;
releases/v0.8.0/blaise is now the verified stage-3 fixpoint of
the current source, so fixpoint converges at stage-2/3.

Headline numbers vs the original 2026-05-16 baseline:
  Small alloc/free:    14 -> 9 ms  (-36%)
  Mixed sizes:          8 -> 5 ms  (-38%)
  Realloc growth:      13 -> 10 ms (-23%)
  Large alloc/free:    33 -> 0 ms  (matches malloc)
  Retain + free-all:    5 -> 5 ms  (unchanged)
This commit is contained in:
Graeme Geldenhuys 2026-05-16 14:45:37 +01:00
parent c16249ae18
commit f387bbf2b7
1 changed files with 60 additions and 0 deletions
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@ -45,6 +45,66 @@ Workload columns
All values in milliseconds. Ratio = blaise_mem / malloc per
workload; "—" when malloc baseline is 0 ms.
================================================================
2026-05-16 — commit c16249a + bootstrap binary refreshed
================================================================
Workload | malloc | blaise_mem | ratio
---------+--------+------------+--------
S | 7 | 9 | 1.3x
M | 5 | 5 | 1.0x
R | 5 | 10-11 | 2.1x
L | 0 | 0 | —
H | 5 | 5 | 1.0x
Notes:
Captures the cumulative effect of three changes shipped in this
session, with the v0.8.0 bootstrap binary refreshed in-place
against the verified stage-3 fixpoint of the new source.
Contributing changes since the 2026-05-16 first-row baseline:
9847369 fix(rtl): restore large-alloc LIFO cache in
blaise_mem. L workload 33 ms -> 0 ms (matches malloc).
b4ec712 feat(codegen): promote tyPointer and tyPChar locals
to QBE temps. Foundational; no direct workload
change but unlocks downstream wins by removing stack
slot loads on every pointer access.
314b537 feat(semantic): mark inline candidates. Analyser
only; no codegen change yet.
c16249a feat(codegen): inline small leaf functions at call
sites. 20 candidates inlined compiler-wide
(RoundUpToClass, MapFailed, PageRound, MemCopy,
StrData, _StringLength, etc.). R workload
12-13 ms -> 10-11 ms (-15%). S workload 10 -> 9 ms.
Compared to the original 2026-05-16 first-row baseline
(before the IsLarge fix landed):
S: 14 -> 9 ms (-36%)
M: 8 -> 5 ms (-38%)
R: 13 -> 10 ms (-23%)
L: 33 -> 0 ms (now matches malloc)
H: 5 -> 5 ms (unchanged; already at malloc parity)
Open gaps (next targets):
R workload (2.1x malloc) — remaining gap is in the
SmallGetMem/memcpy/SmallFreeMem fallback path that fires
when realloc crosses size classes. Inlining SizeClassIndex
and SizeClassBytes would help further; both currently
rejected by the analyser (case stmt, > 8 statements).
S workload (1.3x malloc) — freelist push/pop is already O(1);
the remaining gap is glibc tcache thread-local caching.
Not closing this without a redesign.
Bootstrap binary: releases/v0.8.0/blaise replaced in-place with
the stage-3 fixpoint binary. Fixpoint now converges at
stage-2/3 (was stage-3/4), so future fixpoint runs are faster
(~2 min instead of ~4).
================================================================
2026-05-16 — investigation: in-place arena-tail realloc growth
================================================================