NetBSD Thread Switch Performance
From Wikistix
Scheduler activations were removed after 4.0. This shows the impact on thread context switch time, running on an old SPARC. The code simply has two threads fighting over a flip-flop, via a condition wait and associated mutex. Recorded values are the best of several runs.
| version | thread context switches per second |
|---|---|
| 4.0_BETA | 14894.5 |
| 4.99.16 | 10545.0 |
| 4.99.72 | 10075.0 |
| 5.99.9 | 10763.2 |
Raw output
orac:ksh$ uname -a NetBSD orac.stix.org.au 4.0_BETA NetBSD 4.0_BETA (ORAC) #0: Tue Oct 17 19:50:31 EST 2006 stix@zion.stix.org.au:/export/netbsd/netbsd-4/obj.sparc/export/netbsd/netbsd-4/src/sys/arch/sparc/compile/ORAC sparc orac:ksh$ ./pthreadswitch 76801 thread context switches in 5.156345 seconds 14894.5 thread context switches per second
orac:ksh$ uname -a NetBSD orac.stix.org.au 4.99.16 NetBSD 4.99.16 (ORAC) #0: Sun Mar 25 19:45:39 EST 2007 stix@zion.stix.org.au:/export/netbsd/current/obj.sparc/export/netbsd/current/src/sys/arch/sparc/compile/ORAC sparc orac:ksh$ ./pthreadswitch 55297 thread context switches in 5.243912 seconds 10545.0 thread context switches per second
orac:ksh$ uname -a NetBSD orac.stix.org.au 4.99.72 NetBSD 4.99.72 (ORAC) #0: Thu Aug 21 08:56:22 EST 2008 stix@hex.stix.org.au:/u/netbsd/current/obj.sparc/u/netbsd/current/src/sys/arch/sparc/compile/ORAC sparc orac:ksh$ ./pthreadswitch 55297 thread context switches in 5.488561 seconds 10075.0 thread context switches per second
orac:ksh$ uname -a NetBSD orac.stix.org.au 5.99.9 NetBSD 5.99.9 (ORAC) #0: Fri Apr 10 18:43:31 EST 2009 stix@hex.stix.org.au:/u/netbsd/20090403T0002/obj.sparc/u/netbsd/20090403T0002/src/sys/arch/sparc/compile/ORAC sparc orac:ksh$ ./pthreadswitch 65537 thread context switches in 6.088976 seconds 10763.2 thread context switches per second
