Support for selecting memory allocator

[sunlei]

Pull Request

Support for selecting memory allocator.

• Added as features:
  • allocator-jemalloc
  • allocator-mimalloc
• In one of my Rust projects with heavy network and computational I/O workloads, both mimalloc and jemalloc outperformed the system allocator:
  • mimalloc + glibc performed better than jemalloc + glibc
    • Both outperformed configurations using + musl
  • Therefore, mimalloc + glibc is recommended.

Type of change

• New feature (non-breaking change which adds functionality)

Issue

Since the cargo checks in pre-commit are run with --all-features, the logic for choosing between allocators fails to pass the checks. As a temporary workaround, the code related to jemalloc has been commented out. So:

• Is there a better approach to support a mutually exclusive choice between the two?
• Or should we simply remove jemalloc and keep only mimalloc?
• Use tools like https://github.com/taiki-e/cargo-hack ?

[github-actions]

Thank you for your contribution! 🙏

The pre-commit checks failed, but this is easy to fix. You'll need to run:

make pre-commit
# or
pre-commit run --all-files

This will automatically fix most formatting issues. Just commit any changes and push again.

See our CONTRIBUTING.md guide for more details.