Add env variable for rayon thread counts (#12693)
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#[macro_use]
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extern crate lazy_static;
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use std::env;
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//TODO remove this hack when rayon fixes itself
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lazy_static! {
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// reduce the number of threads each pool is allowed to half the cpu core count, to avoid rayon
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// hogging cpu
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static ref MAX_RAYON_THREADS: usize = num_cpus::get() as usize / 2;
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static ref MAX_RAYON_THREADS: usize =
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env::var("SOLANA_RAYON_THREADS")
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.map(|x| x.parse().unwrap_or(num_cpus::get() as usize / 2))
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.unwrap_or(num_cpus::get() as usize / 2);
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}
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pub fn get_thread_count() -> usize {
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