On Mon, May 30, 2011 at 3:03 PM, Kishore Kumar Pusukuri <kish...@cs.ucr.edu>wrote:
> Hi, > I would like to measure both system utilization and application > (multithreaded application) progress on a 8-core machine running Solaris 10. > I am using prstat(1) for measuring the progress of the application in terms > of USR and planning to use mpstat(1) for mesauring overall system > utilization in terms of (100 - idl). I am running one multithreaded > application at a time. > > However, I am observing some strange results. For example, when I run > application A, its prstat output (average) is as follows. As you can see > application A is utilizing system resources for around 67% of the elapsed > time. I have used 1 second interval for both the prstat and mpstat. > > PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/NLWP > 11668 user 67 0.4 0.1 0.0 0.0 20 11 4.0 108 148 206 0 A/9 > > The following is the output of mpstat -a. As you can see, more or less > mpstat also shows that application A is consuming system resources in the > lines of the output of prstat. > > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt > idl sze > 0 6468 0 74 1664 215 4599 926 345 94 0 22223 77 3 0 20 > 8 > > > However, for another application B, there is a significant difference > between prstat and mpstat outputs. As you can see, prstat shows that > application B is utilizing system resources for only 17% while mpstat shows > it is around 98%. > > prstat output: > PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/NLWP > 2342 user 17 0.2 0.0 0.0 0.0 70 0.0 13 4 40 49 0 B/43 > > mpstat output: > SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt > idl sze > 0 4662 0 32941 34085 248 1032 560 94 81 0 4124 98 2 0 0 > 8 > > Please help me to understand the above behavior. And also please let me > know if there is any efficient way to measure overall system utilization. > > Actually I am working on developing a new scheduling algorithm for Solaris > 10. For this, I need to monitor both the progress of the applications and > also overall system utilization. I am planning to use USR of prstat as a > metric to measure the progress of an application and the output of mpstat > i.e., (100 - idl) as a metric for system > utilization.<perf-discuss@opensolaris.org> mpstat will show overall USR utilization by all processes. is there any other app that appB might be triggering that would be using the remaining 81% of USR ? You can check that right in prstat. -- Giovanni Tirloni
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