[Spce-user] SEMS SBC CPU question

[Schaefer, Larry]

I am trying to run SPCE with the SEMS SBC module (running with symmetric rtp configuration) in Amazon EC2 and having performance issues.  After about 700 callers, CPU on SEMS process is maxed and RTP starts to drop.  While watching top, it appears that sems is only running on one core.  Below is the output that I see while under load:

top - 23:08:06 up  7:31,  2 users,  load average: 0.43, 0.12, 0.08
Tasks: 144 total,   1 running, 143 sleeping,   0 stopped,   0 zombie
%Cpu0  :  9.2 us, 66.7 sy,  0.0 ni,  0.7 id,  0.0 wa,  0.0 hi, 23.4 si,  0.0 st
%Cpu1  :  1.3 us,  0.0 sy,  0.0 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.3 st
%Cpu2  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu4  :  0.3 us,  0.3 sy,  0.0 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu5  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu6  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu7  :  0.7 us,  1.0 sy,  0.0 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:   7134848 total,  2906892 used,  4227956 free,    46916 buffers
KiB Swap:        0 total,        0 used,        0 free,  2022252 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
32702 sems      20   0  329m 186m 2088 S 103.0  2.7   4:26.85 sems
29108 root      20   0  128m 1636  424 S   3.0  0.0   1:17.43 mediaproxy-ng
1638 root      20   0  255m 1584 1128 S   1.3  0.0   0:21.14 rsyslogd
2985 mysql     20   0  657m 110m 7576 S   0.3  1.6   0:18.12 mysqld
29755 kamailio  20   0 1061m  24m 6500 S   0.3  0.4   0:02.16 kamailio
29756 kamailio  20   0 1061m  24m 6500 S   0.3  0.4   0:02.16 kamailio
29757 kamailio  20   0 1061m  24m 6500 S   0.3  0.4   0:02.11 kamailio
29759 kamailio  20   0 1061m  24m 6496 S   0.3  0.4   0:02.13 kamailio
29760 kamailio  20   0 1061m  24m 6500 S   0.3  0.4   0:02.10 kamailio
29762 kamailio  20   0 1060m  23m 4852 S   0.3  0.3   0:04.63 kamailio
    1 root      20   0 10644  820  688 S   0.0  0.0   0:03.01 init

Is there any way to configure sems to use multiple cores for processing calls?  From the display looks like Cpu1-Cpu7 are idle, but Cpu0 is getting hit at 100%.

Thanks,
Larry

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