IDS Forum

Re: Monitoring CPU usage

Posted By: Michael Mueller
Date: Wednesday, 16 February 2005, at 7:33 a.m.

In Response To: Monitoring CPU usage (Navaid Arif)

Hi,

I would change the advice from your book a little and use the "Virtual
processor summary" times for class cpu:

time cpu-time
-------------------------
00:52:02 108202.91
01:00:22 108251.34
-------------------------
diff: 500 secs 48.43 secs

Your cpu vp uses 48.43 cpu secs out of 500 secs = 9.68%. (If you do this
calculation with n cpu vps instead of 1 devide the resulting % value by n.)

This is far below 100% and there is no need to add a second cpu vp. But
if you do, it probably wouldn't hurt either.

If you want to keep your single cpu vp, you can set "SINGLE_CPU_VP 1".
It saves some internal latching but forbids adding cpu vps dynamically.

Regards

Michael


Navaid Arif wrote:
> Dear All,
> I am using IDS 7.3 on RS-6000 p-Series with AIX. I have two hardware
> processors in my server machine, but in onconfig file I found :
>
> MULTIPROCESSOR 0 # 0 for single-processor, 1 for multi-processor
> NUMCPUVPS 1 # Number of user (cpu) vps
> SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one
> NOAGE 0 # Process aging
> AFF_SPROC 0 # Affinity start processor
> AFF_NPROCS 0 # Affinity number of processors
>
>
> Before changing it to 'MULTIPROCESSOR 1' I want to confirm CPU utilization.
> As I will enable MULTIPROCESSOR, I will add a CPU VP as well. To make sure
> that IDS really need another CPU. I execute following command :
>
> onstat -g glo
>
> It gave following figures:
>
>
> Informix Dynamic Server Version 7.31.FD3 -- On-Line -- Up 33 days
> 00:52:02 -
> - 199728 Kbytes
>
> MT global info:
> sessions threads vps lngspins
> 71 92 16 0
>
> sched calls thread switches yield 0 yield n yield forever
> total: 3195336250 456925131 2805835830 42590908 145700814
> per sec: 107 75 32 6 5
>
> Virtual processor summary:
> class vps usercpu syscpu total
> cpu 1 97045.63 11157.28 108202.91
> aio 10 583.66 1578.32 2161.98
> lio 1 28.91 65.36 94.27
> pio 1 146.55 650.22 796.77
> adm 1 83.34 109.54 192.88
> soc 1 1972.14 11626.22 13598.36
> msc 1 43.17 13.06 56.23
> total 16 99903.40 25200.00 125103.40
>
> Individual virtual processors:
> vp pid class usercpu syscpu total
> 1 16598 cpu 97045.63 11157.28 108202.91
> 2 11030 adm 83.34 109.54 192.88
> 3 17052 lio 28.91 65.36 94.27
> 4 16124 pio 146.55 650.22 796.77
> 5 17304 aio 133.37 373.77 507.14
> 6 18068 msc 43.17 13.06 56.23
> 7 17810 aio 103.90 328.03 431.93
> 8 17552 soc 1972.14 11626.22 13598.36
> 9 13338 aio 87.13 258.06 345.19
> 10 18326 aio 66.52 206.95 273.47
> 11 10192 aio 50.65 127.29 177.94
> 12 9682 aio 39.64 83.24 122.88
> 13 15342 aio 29.70 58.53 88.23
> 14 10510 aio 24.87 50.06 74.93
> 15 13898 aio 24.36 47.03 71.39
> 16 16184 aio 23.52 45.36 68.88
> tot 99903.40 25200.00 125103.40
>
>
> When I execute the same command after 8 minutes, it showed:
>
> Informix Dynamic Server Version 7.31.FD3 -- On-Line -- Up 33 days
> 01:00:22 -
> - 199728 Kbytes
>
> MT global info:
> sessions threads vps lngspins
> 71 92 16 0
>
> sched calls thread switches yield 0 yield n yield forever
> total: 3207093453 456990509 2817528512 42592314 145728029
> per sec: 197366 487 196880 6 191
>
> Virtual processor summary:
> class vps usercpu syscpu total
> cpu 1 97093.07 11158.27 108251.34
> aio 10 584.38 1579.73 2164.11
> lio 1 28.92 65.38 94.30
> pio 1 146.59 650.35 796.94
> adm 1 83.36 109.55 192.91
> soc 1 1972.32 11627.18 13599.50
> msc 1 43.19 13.06 56.25
> total 16 99951.83 25203.52 125155.35
>
> Individual virtual processors:
> vp pid class usercpu syscpu total
> 1 16598 cpu 97093.07 11158.27 108251.34
> 2 11030 adm 83.36 109.55 192.91
> 3 17052 lio 28.92 65.38 94.30
> 4 16124 pio 146.59 650.35 796.94
> 5 17304 aio 133.51 373.95 507.46
> 6 18068 msc 43.19 13.06 56.25
> 7 17810 aio 104.02 328.32 432.34
> 8 17552 soc 1972.32 11627.18 13599.50
> 9 13338 aio 87.27 258.30 345.57
> 10 18326 aio 66.62 207.15 273.77
> 11 10192 aio 50.74 127.43 178.17
> 12 9682 aio 39.71 83.36 123.07
> 13 15342 aio 29.74 58.57 88.31
> 14 10510 aio 24.87 50.14 75.01
> 15 13898 aio 24.38 47.11 71.49
> 16 16184 aio 23.52 45.40 68.92
> tot 99951.83 25203.52 125155.35
>
>
> In a book, from where I found this command, it was written "IF THE
> ACCUMULATED USERCPU AND SYSCPU TIMES, TAKEN TOGETHER, APPROACH 100 PERCENT
> OF THE ACTUAL ELAPSED TIME FOR THE PERIOD OF THE TEST, ADD ANOTHER CPU
> VIRTUAL PROCESSOR IF YOU HAVE A CPU AVAILABLE TO RUN IT." I could not
> understand, how will I get the percentage from this and how to read this
> command's result?
> If anybody knows any other way to monitor/check CPU utilization, please
> reply.
>
> Thanks in advance.
>
>
>
> Regards,
>
> Navaid Arif
> Software Operations Executive,
> ORIX Network,
> 111-767-657 Ext: 223
>
>
>

Messages In This Thread

• Monitoring CPU usage
  Navaid Arif -- Wednesday, 16 February 2005, at 5:00 a.m.
  • Re: Monitoring CPU usage
    Michael Mueller -- Wednesday, 16 February 2005, at 7:33 a.m.
  • Re: Monitoring CPU usage
    Madison Pruet -- Wednesday, 16 February 2005, at 10:43 a.m.

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