snmalloc-rs

snmalloc-rs provides a wrapper for microsoft/snmalloc to make it usable as a global allocator for rust. snmalloc is a research allocator. Its key design features are:

• Memory that is freed by the same thread that allocated it does not require any synchronising operations.
• Freeing memory in a different thread to initially allocated it, does not take any locks and instead uses a novel message passing scheme to return the memory to the original allocator, where it is recycled.
• The allocator uses large ranges of pages to reduce the amount of meta-data required.

Some old benchmark results are available in the snmalloc paper. There are three features defined in this crate:

• debug: Enable the Debug mode in snmalloc.
• 1mib: Use the 1mib chunk configuration.
• cache-friendly: Make the allocator more cache friendly (setting CACHE_FRIENDLY_OFFSET to 64 in building the library).

To use snmalloc-rs add it as a dependency:

# Cargo.toml
[dependencies]
snmalloc-rs = "0.2"

To set SnMalloc as the global allocator add this to your project:

#[global_allocator]
static ALLOC: snmalloc_rs::SnMalloc = snmalloc_rs::SnMalloc;