The man page states the difference but does not explain it in detail.
CPU The percentage of recent CPU time used by the process. If executing in a non-global zone and the pools facility is active, the percentage will be that of the processors in the processor set in use by the pool to which the zone is bound. USR The percentage of time the process has spent in user mode. SYS The percentage of time the process has spent in system mode. The CPU number is the same as ps reports, its a time-decayed average of recent CPU usage measured using clock-tick sampling. Its also divided down by the number of CPUs in the system (or zone). So if you see 2% on a 10CPU system its the same as 20% on a 1CPU system. The USR and SYS numbers are proportions of wall-clock time, accurately measured on every state transition using microstate accounting. Since prstat runs at a given interval, they are the average over the interval since the previous measurement. This is a much more useful measure, and it is not divided down by the CPU count. The output you show looks suspicious to me because process C has not accumulated any time since starting. You should let it run for a while and reach a steady state before trying to compare the two measures. Adrian On 10/19/06, Cherian Abraham <[EMAIL PROTECTED]> wrote:
Hi All, Thanks for all the feedback. I tried to run both prstat and prstat -m option and here are the output displays... (showing only three processes). prstat -mL PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/LWPID 25952 root 30 30 0.0 0.0 0.0 0.0 30 0.0 100 6K 87K 0 processC/1 25571 root 5.1 0.7 0.0 0.0 0.0 0.0 93 0.0 57 68 5K 0 processB/1 2003 root 0.3 1.2 0.1 0.0 0.0 0.0 97 1.9 67 8 1K 21 processA/1 prstat PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP 2003 root 39M 38M sleep 59 0 3:05:58 0.6% processA/1 25571 root 6488K 5752K sleep 13 0 0:00:00 0.5% processB/1 25952 root 5208K 4184K sleep 23 0 0:00:00 0.1% processC/1 Is it possible to relate the CPU usage shown by prstat and prstat -m ? or am i comparing apples and oranges here ? process C shows 0.1% CPU usage (is this only usr time?) and microstate accounting shows 30% user time, 30% sys time and 30% sleep. How does one relate the two ? The above is just snapshots taken almost at the same time. My testing is normally done in a 2 hr time frame. So i could run prstat with 10 sec sampling rate and prstat -m with also a 10 sec sampling rate during the same period. The sampling instance for both maybe slightly off. If i average out during this run for each process from prstat and also the same from prstat -m, how do i relate these values ? This message posted from opensolaris.org _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
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