30 lines
1.2 KiB
Rust
30 lines
1.2 KiB
Rust
pub mod cert;
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pub mod crypt_config;
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pub mod format;
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pub mod json;
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pub mod lru_cache;
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pub mod nom;
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pub mod sha;
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pub mod ticket;
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pub mod async_lru_cache;
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/// Set MMAP_THRESHOLD to a fixed value (128 KiB)
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///
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/// This avoids the "dynamic" mmap-treshold logic from glibc's malloc, which seems misguided and
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/// effectively avoids using mmap for all allocations smaller than 32 MiB. Which, in combination
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/// with the allocation pattern from our/tokio's complex async machinery, resulted in very large
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/// RSS sizes due to defragmentation and long-living (smaller) allocation on top of the heap
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/// avoiding that the (big) now free'd allocations below couldn't get given back to the OS. This is
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/// not an issue with mmap'd memeory chunks, those can be given back at any time.
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///
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/// Lowering effective MMAP treshold to 128 KiB allows freeing up memory to the OS better and with
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/// lower latency, which reduces the peak *and* average RSS size by an order of magnitude when
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/// running backup jobs. We measured a reduction by a factor of 10-20 in experiments and see much
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/// less erratic behavior in the overall's runtime RSS size.
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pub fn setup_libc_malloc_opts() {
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unsafe {
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libc::mallopt(libc::M_MMAP_THRESHOLD, 4096 * 32);
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}
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}
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