Revision: 54969
http://brlcad.svn.sourceforge.net/brlcad/?rev=54969&view=rev
Author: brlcad
Date: 2013-03-29 15:51:34 +0000 (Fri, 29 Mar 2013)
Log Message:
-----------
stub in an implementation of thread affinity for mac os x, to the extent that
mac supports the notion. they don't really do affinity, but will let you
group/ungroup threads to help/discourage cache sharing. here we put every
thread into their own group so the default affinity scheduling should help
minimize cpu movement.
Modified Paths:
--------------
brlcad/trunk/src/libbu/affinity.c
Modified: brlcad/trunk/src/libbu/affinity.c
===================================================================
--- brlcad/trunk/src/libbu/affinity.c 2013-03-29 15:47:25 UTC (rev 54968)
+++ brlcad/trunk/src/libbu/affinity.c 2013-03-29 15:51:34 UTC (rev 54969)
@@ -40,6 +40,11 @@
# include <pthread_np.h>
#endif
+#ifdef HAVE_MACH_THREAD_POLICY_H
+# include <mach/thread_policy.h>
+# include <mach/mach.h>
+#endif
+
#include "bu.h"
@@ -48,6 +53,8 @@
{
#if defined(HAVE_PTHREAD_H) && defined (CPU_ZERO)
+ /* Linux and BSD pthread affinity */
+
pthread_t curr_thread = pthread_self(); /* Get current thread */
int cpulim = bu_avail_cpus(); /* Max number of CPUs available
for the process */
int status; /* Status of thread
setting/getting */
@@ -97,9 +104,35 @@
return -1;
}
-#endif
+ return 0;
+#elif defined(HAVE_MACH_THREAD_POLICY_H)
+
+ /* Mac OS X mach thread affinity hinting */
+
+ thread_extended_policy_data_t epolicy;
+ thread_affinity_policy_data_t apolicy;
+ thread_t curr_thread = mach_thread_self();
+ kern_return_t ret;
+
+ epolicy.timeshare = FALSE;
+ ret = thread_policy_set(curr_thread, THREAD_EXTENDED_POLICY,
(thread_policy_t) &epolicy, THREAD_EXTENDED_POLICY_COUNT);
+ if (ret != KERN_SUCCESS)
+ return -1;
+
+ apolicy.affinity_tag = curr_thread;
+ ret = thread_policy_set(curr_thread, THREAD_EXTENDED_POLICY,
(thread_policy_t) &apolicy, THREAD_EXTENDED_POLICY_COUNT);
+ if (ret != KERN_SUCCESS)
+ return -1;
+
return 0;
+
+#else
+
+ /* don't know how to set thread affinity on this platform */
+ return 0;
+
+#endif
}
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