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Rollup merge of #39583 - michaelwoerister:limit-llvm-threads, r=nikomatsakis

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back: Limit the number of LLVM worker threads.

This should fix issue https://github.com/rust-lang/rust/issues/39568.
Also see https://github.com/rust-lang/rust/issues/39280.

r? @nikomatsakis
This commit is contained in:
Corey Farwell 2017-02-08 10:19:54 -05:00 committed by GitHub
commit 7658921267
1 changed files with 8 additions and 4 deletions
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12
src/librustc_trans/back/write.rs
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@ -27,6 +27,7 @@
use syntax_pos::MultiSpan;
use context::{is_pie_binary, get_reloc_model};
use std::cmp;
use std::ffi::CString;
use std::fs;
use std::path::{Path, PathBuf};
@ -754,10 +755,13 @@ pub fn run_passes(sess: &Session,
}
// Process the work items, optionally using worker threads.
// NOTE: This code is not really adapted to incremental compilation where
// the compiler decides the number of codegen units (and will
// potentially create hundreds of them).
let num_workers = work_items.len() - 1;
// NOTE: We are hardcoding a limit of worker threads for now. With
// incremental compilation we can run into situations where we would
// open hundreds of threads otherwise -- which can make things slower
// if things don't fit into memory anymore, or can cause the compiler
// to crash because of too many open file handles. See #39280 for
// some discussion on how to improve this in the future.
let num_workers = cmp::min(work_items.len() - 1, 32);
if num_workers <= 1 {
run_work_singlethreaded(sess, &trans.exported_symbols, work_items);
} else {