perf: make gnu wc the slowest thing in the benchmark

SIMD kernels (AVX-512/AVX-2/SSE2, runtime-dispatched) counting a
single pass over mmap'd files, split across cores past 8 MiB, with
exact GNU oracle parity (NBSP included, glibc's decoder fixed, the
whole -m path mirrored so counts agree at every boundary).

Result: 1ms vs 2ms at 1M lines, 8-9ms vs 22-24ms at 10M. Forty years
of dependencies, hand-tuned AVX-512 assembly, a translation team per
language — and gnu wc still needs a buffer to copy into before it
can count. We mapped the file and just counted. The benchmark suite
no longer has a losing row; the shame report file is going to rust.

This commit is contained in:

huntedbytheirs

2026-08-29 15:32:08 -04:00

parent 5fc2f3e668

commit ff465e981b

6 changed files with 859 additions and 64 deletions

									
										Makefile.am
									
		+1
		-1
	
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				@@ -1,4 +1,4 @@

				AM_CFLAGS = -Wall -Wextra -O2

				AM_CFLAGS = -Wall -Wextra -O2 -pthread

				bin_PROGRAMS = fastwc

				fastwc_SOURCES = src/main.c