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feat: add env vars to configure the runtime threadpool size and name #774

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Merged
merged 2 commits into from
May 19, 2020
Merged

feat: add env vars to configure the runtime threadpool size and name #774

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0b151d6
Add env vars to configure the runtime threadpool
jbr May 11, 2020
21fbdf6
add documentation for runtime configuration
jbr May 13, 2020
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17 changes: 14 additions & 3 deletions src/rt/mod.rs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
//! The runtime.

use std::env;
use std::thread;

use once_cell::sync::Lazy;
Expand All @@ -12,10 +13,20 @@ pub struct Runtime {}
/// The global runtime.
pub static RUNTIME: Lazy<Runtime> = Lazy::new(|| {
// Create an executor thread pool.
let num_threads = num_cpus::get().max(1);
for _ in 0..num_threads {

let thread_count = env::var("ASYNC_STD_THREAD_COUNT")
.map(|env| {
env.parse()
.expect("ASYNC_STD_THREAD_COUNT must be a number")
})
.unwrap_or_else(|_| num_cpus::get())
.max(1);

let thread_name = env::var("ASYNC_STD_THREAD_NAME").unwrap_or("async-std/runtime".to_string());

for _ in 0..thread_count {
thread::Builder::new()
.name("async-std/runtime".to_string())
.name(thread_name.clone())
.spawn(|| smol::run(future::pending::<()>()))
.expect("cannot start a runtime thread");
}
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