Replace sched_yield with usleep(1) on Linux

to avoid the massive overhead of the sched_yield call on Linux kernels since its semantics were changed in early 2003 (late 2.5 series) to include reordering of the thread queue. Ref. #900,#923
2017-01-08 23:05:55 +01:00 · 2017-01-08 23:05:55 +01:00 · f1db56fcd7
parent c61a7cd293
commit f1db56fcd7
1 changed files with 4 additions and 0 deletions
--- a/common.h
+++ b/common.h
@ -314,6 +314,10 @@ typedef int blasint;
 #define YIELDING	thr_yield()
 #endif
 	
+#if defined(OS_LINUX)
+#define YIELDING	usleep(1)
+#endif
+
 #if defined(OS_WINDOWS)
 #if defined(_MSC_VER) && !defined(__clang__)
 #define YIELDING    YieldProcessor()