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xsvm
8fe2c74f58
memory-stats reads /proc/self/smaps by default on Linux: every sample formats and parses one block per mapping while holding the mmap lock. The benches' RssSampler polls it every 2 ms, so on a profile of bevel_bench --size 4000x3000 the rss-sampler thread was ~22% of all samples (smaps_account 14.7%, smaps_pte_entry 6.3%), contending with the measured threads. Enable the crate's always_use_statm feature: one short read of the kernel's RSS counters, the same number VmRSS reports. The measured code is unchanged; only the harness overhead goes.
21 lines
706 B
TOML
21 lines
706 B
TOML
[package]
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name = "photocraft-testkit"
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version.workspace = true
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edition.workspace = true
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license.workspace = true
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[lints]
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workspace = true
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[dependencies]
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photocraft-geom = { workspace = true }
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photocraft-color = { workspace = true }
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photocraft-raster = { workspace = true }
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serde_json = { workspace = true }
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[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
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# In-process resident memory for the benchmarks (`perf`; MIT OR Apache-2.0). `always_use_statm`:
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# on Linux read /proc/self/statm, not /proc/self/smaps, which walks every mapping under the mmap
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# lock and made the 2 ms sampler thread a fifth of a large bench's CPU time.
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memory-stats = { version = "1.2", features = ["always_use_statm"] }
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