Macro bench_main 

macro_rules! bench_main {
    (allocator = none; $($groups:tt)*) => { ... };
    (allocator = $allocator:path; $($groups:tt)*) => { ... };
    ($($groups:tt)*) => { ... };
}

Defines the entry point for GPUI Criterion benchmark groups.

This mirrors criterion::criterion_main! so GPUI benchmark files can keep the same shape as ordinary Criterion benchmarks. It also installs [CountingAllocator] as the binary’s global allocator, so reports include heap allocations per iteration. It wraps the system allocator by default; allocator = Path; wraps another unit-struct allocator instead, e.g. to compare allocators, which pay the same small counting cost:

gpui::bench_main!(allocator = mimalloc::MiMalloc; benches);

allocator = none; installs no global allocator, leaving Rust’s default and dropping the allocation metrics from reports.