On 11/4/13, 7:40 AM, wufei wrote:
Hello All,
I am using perf to measure a multi-threaded program on kernel 3.2.23,
the system has 40 cores and there are lots of context switches during
the test. The command is:
# perf record -e sched:sched_stat_sleep -e sched:sched_switch -e
sched:sched_process_exit -g -r 0 -p 39249 sleep 5
It generates a ~1GB size perf.data. `perf report` got 2 issues:
1. A lot of this warning message:
Warning: Timestamp below last timeslice flush
What's the NUMA make up? multiple sockets?
2. No useful output, but this:
Found 32117 unknown events!
Try increasing the mmap size. e.g., -m 2048. Does it decrease or remove
this stat?
David
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