[Users] Question about Processes and their priorities in OpenSER

Klaus Darilion klaus.mailinglists at pernau.at
Wed Jun 6 13:56:11 CEST 2007



Ian Fedeli wrote:
> Hello,
> 
> I am working on trying to stress OpenSER using a benchmarking utility.
> 
> I have three questions:
> 
> 1) I was hoping someone here could tell me how many 'openser'
> processes I should expect, and what their functions are.
> 
> For example, I would expect there would be one process for each child,
> but I find that there are more processes than children as configured
> in openser.cfg. I have it set to 32 children in openser.cfg, and yet I
> find that there are 36 processes. The only non-standard module I have
> configured openSER to use is the mySQL module. I have attached the
> output of ps auwx | grep openser below.

There is:
1 attendant
1 timer
numberOfUdpSockets x children UDP worker

if TCP (TLS) is used:
1 TCP listener
tcp_children tcp worker threads

use "openserctl ps" to get a description of the processes

regards
klaus

> 
> 2) When I observe the benchmark as it is running (see below), I notice
> one process that seems to have a lower priority, yet take up more CPU
> time than the rest. Is this process special (this relates to question
> 1)?
> 
> 3) Why is only one processor (Cpu2 in the example below) saturated?
> The server is running on Ubuntu Server 7.04 on a machine with 2
> dual-core processors, for a total of 4 CPUs. I am reasonably sure my
> benchmark is not network limited, as the server and the
> client-benchmark machine are connected via 2 Gigabit NICs.
> 
> I have also discovered that if I renice the process mentioned in
> question 2 to -20, all 4 processors become saturated, and the
> throughput of the server more than doubles.
> 
> The output from top is below.
> 
> Any insight is greatly appreciated.
> 
> Thanks,
> --Ian Fedeli
> 
> #ps auxw | grep openser
> 
> root     27038  0.0  0.0 2150456 4536 ?        S    10:20   0:00
> /usr/local/sbin/openser -E -m 2048
> root     27039  1.3  7.4 2150456 609804 ?      S    10:20   0:03
> /usr/local/sbin/openser -E -m 2048
> root     27040  3.7  7.6 2150456 624188 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27041  3.6  7.6 2150456 625852 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27042  3.6  7.5 2150456 614116 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27043  3.6  7.5 2150456 619564 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27044  0.0  0.0 2150460 1020 ?        S    10:20   0:00
> /usr/local/sbin/openser -E -m 2048
> root     27045  3.6  7.5 2150456 615800 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27046  3.8  7.5 2150456 621144 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27047  3.8  7.6 2150456 623408 ?      S    10:20   0:10
> /usr/local/sbin/openser -E -m 2048
> root     27048  3.7  7.6 2150456 627172 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27050  3.8  7.6 2150456 627780 ?      R    10:20   0:10
> /usr/local/sbin/openser -E -m 2048
> root     27051  3.6  7.6 2150456 624980 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27054  3.7  7.6 2150456 622324 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27056  3.8  7.6 2150456 623992 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27058  3.8  7.5 2150456 616816 ?      S    10:20   0:10
> /usr/local/sbin/openser -E -m 2048
> root     27060  3.5  7.5 2150456 620464 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27062  3.6  7.5 2150456 614324 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27064  3.5  7.4 2150456 611200 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27065  3.7  7.5 2150456 616132 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27067  3.5  7.5 2150456 617480 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27070  3.6  7.5 2150456 618024 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27071  3.6  7.5 2150456 619008 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27073  3.7  7.5 2150456 619724 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27076  3.6  7.5 2150456 617448 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27077  3.7  7.6 2150456 624320 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27080  3.6  7.5 2150456 619576 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27081  3.6  7.5 2150456 615472 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27082  3.8  7.5 2150456 615396 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27086  3.7  7.6 2150456 621484 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27088  3.7  7.5 2150456 617260 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27090  3.6  7.5 2150456 616068 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27092  3.6  7.4 2150456 609980 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27093  3.6  7.5 2150456 616160 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27094  3.6  7.4 2150456 610928 ?      S    10:20   0:09
> /usr/local/sbin/openser -E -m 2048
> root     27098 21.8  1.9 2150456 159300 ?      R    10:20   0:56
> /usr/local/sbin/openser -E -m 2048
> 
> #top (before renicing)
> Tasks: 109 total,  15 running,  94 sleeping,   0 stopped,   0 zombie
> Cpu0  : 23.0%us, 16.0%sy,  0.0%ni, 34.0%id,  0.0%wa,  3.0%hi, 24.0%si,  
> 0.0%st
> Cpu1  : 26.7%us, 20.8%sy,  0.0%ni, 50.5%id,  0.0%wa,  0.0%hi,  2.0%si,  
> 0.0%st
> Cpu2  : 44.6%us, 53.5%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  2.0%si,  
> 0.0%st
> Cpu3  : 25.7%us, 21.8%sy,  0.0%ni, 52.5%id,  0.0%wa,  0.0%hi,  0.0%si,  
> 0.0%st
> Mem:   8175948k total,  1108488k used,  7067460k free,    74800k buffers
> Swap:  3301316k total,        0k used,  3301316k free,   888692k cached
> 
>  PID USER      PPID  PR  VIRT  RES  SHR S %CPU P %MEM    TIME+  COMMAND
> 10065 root     10006  25 2100m  12m  11m R   28 2  0.2   0:10.65 openser
> 10013 root     10006  15 2100m 522m 522m R   13 2  6.5   0:03.03 openser
> 10010 root     10006  15 2100m 525m 524m R   11 2  6.6   0:03.21 openser
> 10057 root     10006  15 2100m 432m 431m S    9 0  5.4   0:02.65 openser
> 10063 root     10006  15 2100m 487m 486m S    9 0  6.1   0:02.83 openser
> 10011 root     10006  15 2100m 510m 509m R    8 1  6.4   0:03.23 openser
> 10012 root     10006  15 2100m 511m 510m S    8 3  6.4   0:02.97 openser
> 10017 root     10006  15 2100m 481m 480m R    8 2  6.0   0:02.80 openser
> 10021 root     10006  15 2100m 487m 486m S    8 2  6.1   0:03.01 openser
> 10024 root     10006  15 2100m 484m 484m S    8 0  6.1   0:02.92 openser
> 10029 root     10006  15 2100m 492m 491m S    8 3  6.2   0:02.65 openser
> 10033 root     10006  15 2100m 501m 501m S    8 3  6.3   0:03.00 openser
> 10036 root     10006  15 2100m 476m 475m S    8 3  6.0   0:02.81 openser
> 10038 root     10006  15 2100m 488m 488m S    8 3  6.1   0:02.88 openser
> 10048 root     10006  15 2100m 463m 462m R    8 1  5.8   0:02.66 openser
> 
> 
> #top (after renicing)
> Tasks: 109 total,  32 running,  77 sleeping,   0 stopped,   0 zombie
> Cpu0  : 42.9%us, 24.5%sy,  0.0%ni,  0.0%id,  0.0%wa,  6.1%hi, 26.5%si,  
> 0.0%st
> Cpu1  : 52.0%us, 44.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  4.0%si,  
> 0.0%st
> Cpu2  : 51.0%us, 47.1%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  2.0%si,  
> 0.0%st
> Cpu3  : 46.0%us, 50.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  4.0%si,  
> 0.0%st
> Mem:   8175948k total,  1262084k used,  6913864k free,    74808k buffers
> Swap:  3301316k total,        0k used,  3301316k free,  1032116k cached
> 
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+   PPID COMMAND
> 10317 root       0 -20 2100m  12m  12m S   54  0.2   0:10.84 10258 openser
> 10279 root      16   0 2100m 490m 489m R   18  6.1   0:02.88 10258 openser
> 10264 root      16   0 2100m 473m 472m R   14  5.9   0:02.54 10258 openser
> 10265 root      16   0 2100m 464m 463m R   14  5.8   0:02.73 10258 openser
> 10266 root      16   0 2100m 481m 480m R   14  6.0   0:02.55 10258 openser
> 10271 root      16   0 2100m 463m 462m R   14  5.8   0:02.57 10258 openser
> 10286 root      16   0 2100m 470m 470m R   14  5.9   0:02.41 10258 openser
> 10304 root      15   0 2100m 434m 433m S   14  5.4   0:02.53 10258 openser
> 10305 root      16   0 2100m 456m 455m R   14  5.7   0:02.37 10258 openser
> 10307 root      16   0 2100m 387m 386m R   14  4.8   0:02.22 10258 openser
> 10262 root      15   0 2100m 476m 475m S   12  6.0   0:02.88 10258 openser
> 10267 root      15   0 2100m 438m 437m R   12  5.5   0:02.50 10258 openser
> 10288 root      16   0 2100m 443m 442m R   12  5.6   0:02.33 10258 openser
> 10289 root      16   0 2100m 458m 457m R   12  5.7   0:02.52 10258 openser
> 
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