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Make dlmalloc 2.4x faster for multithreading

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This change adds a TLS freelist for small dynamic memory allocations.
Cosmopolitan's TIB is now 512 bytes in size. Single-threaded malloc()
performance isn't impacted by this, until pthread_create() is called.
Single-threaded programs may also want to consider using:

    #include "libc/mem/tinymalloc.inc"

Which will shave 30k off the executable size and sometimes go faster.
This commit is contained in:
Justine Tunney 2024-05-28 11:13:12 -07:00
parent deaef81463
commit 07cef612c3
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GPG key ID: BE714B4575D6E328
9 changed files with 150 additions and 6 deletions
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third_party/dlmalloc/README.cosmo vendored
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@ -9,6 +9,7 @@ LICENSE
LOCAL CHANGES
- Use thread-local freelist from cosmo tib
- Use faster two power roundup for memalign()
- Poison maps to integrate with Address Sanitizer
- Introduce __oom_hook() by using _mapanon() vs. mmap()