Hi,
I've attached two patches, one for configure.ac and another for
client/app_start.c, just in case there is any interest in getting them
upstream.
I've spent much time fiddling with Linux kernel schedulers and priorities. I
found that rather than just setting the priority of a task to 19, in the case
that the machine is not a dedicated cruncher, the desktop responsiveness is
improved by setting the tasks schedule policy to BATCH, which gives it a
slight scheduling disadvantage compared to a task running with a standard
NORMAL/OTHER schedule policy and nice'd to 19.
Basically, the patch results in CPU tasks running BATCH/19 and GPU tasks
OTHER/10. In the case of a headless dedicated cruncher the PPD is not affected,
but in the case that the machine is also running general tasks (like a code
build and a desktop), the desktop responsiveness is greatly improved under
heavy load.
Regards
Clive
--
Clive Messer <[email protected]>
--- boinc_core_release_6_6a/client/app_start.cpp.orig 2009-09-19 18:51:44.000000000 +0100
+++ boinc_core_release_6_6a/client/app_start.cpp 2009-09-19 18:55:18.000000000 +0100
@@ -57,6 +57,10 @@
#include <fcntl.h>
#endif
+#ifdef HAVE_SCHED_SETSCHEDULER
+#include <sched.h>
+#endif
+
#include <vector>
using std::vector;
@@ -934,6 +938,16 @@
}
}
#endif
+#ifdef HAVE_SCHED_SETSCHEDULER
+ if (!config.no_priority_change) {
+ struct sched_param p;
+ p.sched_priority = 0;
+ if (sched_setscheduler(0, high_priority?SCHED_OTHER:SCHED_BATCH, &p)
+ ) {
+ perror("sched_setscheduler");
+ }
+ }
+#endif
sprintf(buf, "../../%s", exec_path );
if (g_use_sandbox) {
char switcher_path[100];
--- boinc_core_release_6_10_6/configure.ac.orig 2009-09-20 18:00:34.000000000 +0100
+++ boinc_core_release_6_10_6/configure.ac 2009-09-23 06:34:08.000000000 +0100
@@ -643,7 +643,7 @@
if test "${ac_cv_func_alloca_works}" = "yes" ; then
ac_cv_func_alloca="yes"
fi
-AC_CHECK_FUNCS(alloca _alloca __builtin_alloca ether_ntoa setpriority strlcpy strlcat strcasestr sigaction getutent setutent getisax strdup strdupa daemon stat64 putenv setenv unsetenv)
+AC_CHECK_FUNCS(alloca _alloca __builtin_alloca ether_ntoa setpriority sched_setscheduler strlcpy strlcat strcasestr sigaction getutent setutent getisax strdup strdupa daemon stat64 putenv setenv unsetenv)
dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
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