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std::rt: Use a constant 4 threads for multithreaded sched tests. #7772

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Too much overcommit here exhausts the low fd limit on OS X.
This commit is contained in:
Brian Anderson 2013-07-17 10:51:54 -07:00
parent 93c270c63d
commit 49b72bdd77
1 changed files with 4 additions and 5 deletions
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9
src/libstd/rt/test.rs
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@ -64,7 +64,6 @@ pub fn run_in_mt_newsched_task(f: ~fn()) {
use os; use os;
use from_str::FromStr; use from_str::FromStr;
use rt::sched::Shutdown; use rt::sched::Shutdown;
use rt::util;
let f_cell = Cell::new(f); let f_cell = Cell::new(f);
@ -72,10 +71,10 @@ pub fn run_in_mt_newsched_task(f: ~fn()) {
let nthreads = match os::getenv("RUST_TEST_THREADS") { let nthreads = match os::getenv("RUST_TEST_THREADS") {
Some(nstr) => FromStr::from_str(nstr).get(), Some(nstr) => FromStr::from_str(nstr).get(),
None => { None => {
// Using more threads than cores in test code // A reasonable number of threads for testing
// to force the OS to preempt them frequently. // multithreading. NB: It's easy to exhaust OS X's
// Assuming that this help stress test concurrent types. // low maximum fd limit by setting this too high (#7772)
util::num_cpus() * 2 4
} }
}; };