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[experiment/perf] Disable jemalloc's time-delayed purging, for extra determinism. #77162

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[experiment/perf] Disable jemalloc's time-delayed purging, for extra determinism. #77162

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6 changes: 6 additions & 0 deletions compiler/rustc/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,12 @@ fn main() {
static _F5: unsafe extern "C" fn(*mut c_void, usize) -> *mut c_void = jemalloc_sys::realloc;
#[used]
static _F6: unsafe extern "C" fn(*mut c_void) = jemalloc_sys::free;

// HACK(eddyb) disable time-delayed purging to remove the main (only?)
// source of non-determinism in `jemalloc`.
#[used]
#[export_name = "malloc_conf"]
static MALLOC_CONF: &'static [u8; 34] = b"dirty_decay_ms:0,muzzy_decay_ms:0\0";
}

rustc_driver::set_sigpipe_handler();
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