Revision: 55031
http://brlcad.svn.sourceforge.net/brlcad/?rev=55031&view=rev
Author: brlcad
Date: 2013-04-04 02:56:37 +0000 (Thu, 04 Apr 2013)
Log Message:
-----------
provide a LIBBU_AFFINITY environment variable to allow run-time disabling of
cpu affinity since it defaults to always on for all bu_parallel() threads.
check the environment variable from the parent thread (where we can, most
modern platforms)
Modified Paths:
--------------
brlcad/trunk/src/libbu/parallel.c
Modified: brlcad/trunk/src/libbu/parallel.c
===================================================================
--- brlcad/trunk/src/libbu/parallel.c 2013-04-03 15:33:12 UTC (rev 55030)
+++ brlcad/trunk/src/libbu/parallel.c 2013-04-04 02:56:37 UTC (rev 55031)
@@ -121,6 +121,7 @@
genptr_t user_arg;
int cpu_id;
int counted;
+ int affinity;
};
@@ -347,8 +348,10 @@
/* keep track of our parallel ID number */
thread_set_cpu(user_thread_data->cpu_id);
- /* lock us onto a core corresponding to our parallel ID number */
- parallel_set_affinity(user_thread_data->cpu_id);
+ if (user_thread_data->affinity) {
+ /* lock us onto a core corresponding to our parallel ID number */
+ parallel_set_affinity(user_thread_data->cpu_id);
+ }
if (!user_thread_data->counted) {
bu_semaphore_acquire(BU_SEM_SYSCALL);
@@ -382,6 +385,8 @@
parallel_interface(void)
{
struct thread_data user_thread_data_pi;
+ char *libbu_affinity = NULL;
+ int affinity = 1;
user_thread_data_pi.user_func = parallel_func;
user_thread_data_pi.user_arg = parallel_arg;
@@ -390,7 +395,12 @@
user_thread_data_pi.cpu_id = parallel_nthreads_started++;
bu_semaphore_release(BU_SEM_SYSCALL);
+ libbu_affinity = getenv("LIBBU_AFFINITY");
+ if (libbu_affinity)
+ affinity = (int)strtol(libbu_affinity, NULL, 0x10);
+
user_thread_data_pi.counted = 1;
+ user_thread_data_pi.affinity = affinity;
parallel_interface_arg(&user_thread_data_pi);
@@ -417,6 +427,9 @@
int avail_cpus = 1;
int x;
+ char *libbu_affinity = NULL;
+ int affinity = 1;
+
/*
* multithreading support for SunOS 5.X / Solaris 2.x
*/
@@ -448,6 +461,10 @@
parallel_func = func;
parallel_arg = arg;
+ libbu_affinity = getenv("LIBBU_AFFINITY");
+ if (libbu_affinity)
+ affinity = (int)strtol(libbu_affinity, NULL, 0x10);
+
user_thread_data_bu = (struct thread_data *)bu_calloc(ncpu,
sizeof(*user_thread_data_bu), "struct thread_data *user_thread_data_bu");
/* Fill in the data of user_thread_data_bu structures of all threads */
@@ -456,6 +473,7 @@
user_thread_data_bu[x].user_arg = arg;
user_thread_data_bu[x].cpu_id = x;
user_thread_data_bu[x].counted = 0;
+ user_thread_data_bu[x].affinity = affinity;
}
/* if we're in debug mode, allow additional cpus */
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