Bug 1161405. Part 1 - improve parallelism of nsThreadPool by taking the number of pending events into account when spawning a new thread. r=nfroyd.

2015-05-09 07:32:30 +08:00
parent d76434982a
commit 8e689713fa
3 changed files with 42 additions and 1 deletions
--- a/xpcom/threads/nsThreadPool.cpp
+++ b/xpcom/threads/nsThreadPool.cpp
@@ -82,7 +82,10 @@ nsThreadPool::PutEvent(nsIRunnable* aEvent)
    MOZ_ASSERT(mIdleCount <= (uint32_t)mThreads.Count(), "oops");

    // Make sure we have a thread to service this event.
-    if (mIdleCount == 0 && mThreads.Count() < (int32_t)mThreadLimit) {
+    if (mThreads.Count() < (int32_t)mThreadLimit &&
+        // Spawn a new thread if we don't have enough idle threads to serve
+        // pending events immediately.
+        mEvents.Count() >= mIdleCount) {
      spawnThread = true;
    }