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Can someone explain the output of /proc/pid/sched
Guys,
I am trying to understand the output of the /proc/pid/sched. I could not find anything on the web either. Here is the output I see on my system. root@slot7:/root> cat /proc/10556/sched send_tipc (10556, #threads: 1) --------------------------------------------------------- se.exec_start : 29266438.441437 se.vruntime : 762810.236743 se.sum_exec_runtime : 195.169059 se.avg_overlap : 0.322470 se.avg_wakeup : 3.999993 nr_switches : 3515 nr_voluntary_switches : 3466 nr_involuntary_switches : 49 se.load.weight : 29154 policy : 0 prio : 105 clock-delta : 102 What do each of these values mean. Is the unit nano seconds ? Thanks, Vinay |
FYI See: http://linux.about.com/od/commands/l/blcmdl5_proc.htm
This forum will be to short to tell you all about it |
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A colleague of mine is familiar with the data. The file seems to be new and probably came in as part of CFS. Here is information on some of the data
se.exec_start : 29266438.441437 se.vruntime : 762810.236743 se.sum_exec_runtime : 195.169059 sum_exec_runtime is the CPU time used by the thread (if you add up the utime and stime for the thread it should match this value except this is in nano-secs. vruntime is virtual run time, it kind of is the same as the sum_exec_runtime scaled by the load.weight below. The scheduler uses this field to arrange the ready queue in a Red and Black tree and the one with the least vruntime is always picked to run next. I think exec_start is the current time when this thread is picked up to run, not sure. se.avg_overlap : 0.322470 se.avg_wakeup : 3.999993 avg_wakeup gives the average time the thread spent blocking. nr_switches : 3515 This is the # of context switches. nr_voluntary_switches : 3466 Voluntary switches, I.e the thread blocked and hence another thread is picked up. nr_involuntary_switches : 49 involuntary – the scheduler kicked the thread out as there is another hungry thread is ready to run. se.load.weight : 29154 load.weight is based on the nice value, nice value range from –19 to 20, plays a role in calculating the time slice (note CFS supports variable time slice, a process with nice value of –1 gets ~ 5% more time-slice than a process with nice 0) policy : 0 prio : 105 prio 0-99 are real-time priorities, 100-139 are CFS scheduling priority. 105 indicates you are running with –15 clock-delta : 102 |
Thanks for responding back with that info. here is a little more from the CFS author.
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