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bug#61489: Increase BLOCK_ALIGN from 1024 to 32768

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Originally discovered by Tyler Dodge in his article "Significant Garbage
Collection Improvement For Emacs".

While testing this change on Archlinux system with Intel i5-7200U CPU,
average time of garbage collection gets reduced by ≈25%. Other users
report improvements up to 50%. While monitoring PSS of emacs with and
without customizations loaded before and after the patch, no
statistically significant differences were discovered. So overall, this
change is a win.
* src/alloc.c (BLOCK_ALIGN): increase from 1024 to 32768.
This commit is contained in:
Konstantin Kharlamov 2023-02-16 18:07:55 +03:00 • committed by Eli Zaretskii
parent 49e021e5be
commit 396f46d904
1 changed files with 1 additions and 1 deletions
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src/alloc.c
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@ -1083,7 +1083,7 @@ lisp_free (void *block)
BLOCK_BYTES and guarantees they are aligned on a BLOCK_ALIGN boundary. */
/* Byte alignment of storage blocks. */
#define BLOCK_ALIGN (1 << 10)
#define BLOCK_ALIGN (1 << 15)
verify (POWER_OF_2 (BLOCK_ALIGN));
/* Use aligned_alloc if it or a simple substitute is available.