[ty] Use jemalloc on linux by MichaReiser · Pull Request #21975 · astral-sh/ruff (original) (raw)

added 2 commits

December 13, 2025 08:30

• Copy Ruff's platform-specific allocator configuration to ty:

  • Windows: uses mimalloc
  • Unix-like (x86_64, aarch64, powerpc64, riscv64): uses jemalloc by default
  • Other platforms: uses system allocator

• Add mimalloc feature flag to prefer mimalloc over jemalloc on platforms that support both allocators

• Add allocator memory usage statistics:

  • Set TY_ALLOCATOR_STATS=1 to print memory stats on exit
  • jemalloc: shows allocated, active, resident, mapped, retained, metadata bytes and fragmentation percentage
  • mimalloc: provides guidance for using MIMALLOC_SHOW_STATS=1

• Add tikv-jemalloc-ctl workspace dependency with stats feature

Add comprehensive documentation to the allocator module explaining:

• TY_ALLOCATOR_STATS=1 for built-in stats output
• MALLOC_CONF=stats_print:true for detailed jemalloc stats
• stats_print_opts flags for jemalloc (g, m, d, a, b, l, x)
• MIMALLOC_SHOW_STATS=1 and MIMALLOC_VERBOSE=1 for mimalloc

Also update the jemalloc stats output to include a tip about MALLOC_CONF for users wanting more detailed information.

Update allocator configuration so that:

• No feature flags: use system allocator (default)
• --features jemalloc: use jemalloc on supported platforms
• --features mimalloc: use mimalloc on all platforms
• Both features enabled: jemalloc on supported platforms, mimalloc elsewhere

This makes it easy to compare allocator performance by simply changing the feature flags during build.

MichaReiser changed the title[ty] Use custom allocator [ty] Use jemalloc on linux

Dec 14, 2025

MichaReiser deleted the claude/custom-allocators-mimalloc-01VFGzka5wDLFvvNY9bHrHgG branch

December 15, 2025 15:04

dcreager added a commit that referenced this pull request

Dec 15, 2025

• origin/main: Fluent formatting of method chains (#21369) [ty] Avoid stack overflow when calculating inferable typevars (#21971) [ty] Add "qualify ..." code fix for undefined references (#21968) [ty] Use jemalloc on linux (#21975) Update MSRV to 1.90 (#21987) [ty] Improve check enforcing that an overloaded function must have an implementation (#21978) Update actions/checkout digest to 8e8c483 (#21982) [ty] Use ParamSpec without the attr for inferable check (#21934) [ty] Emit diagnostic when a type variable with a default is followed by one without a default (#21787)

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