strange CPU load issue

From: Mieden, Rick van der (rick.vandermieden_at_orangemail.nl)
Date: 07/25/05

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    Date: Mon, 25 Jul 2005 16:46:58 +0200
To: <sunmanagers@sunmanagers.org>

    Hi all,

    First post to this newsgroups. I hope you can help me find an
    explenation off the following.

    We are running a monitoring application called Nagios which causes a
    very high CPU load:

    Hardware: 2x 1100 Mhz CPU with 1024 MB RAM

    OS : Solaris 8 kernel patch 117350-05

    When I do a top I get the following output:

    last pid: 10261; load averages: 6.85, 7.40, 7.32
    16:41:14

    84 processes: 78 sleeping, 4 running, 2 on cpu

    CPU states: 4.3% idle, 75.9% user, 19.3% kernel, 0.5% iowait, 0.0%
    swap

    Memory: 1024M real, 511M free, 238M swap in use, 2437M swap free

       PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND

     24512 netsaint 5 0 0 8808K 6608K sleep 7:42 1.63% nagios

     10256 netsaint 1 0 0 8232K 7640K run 0:00 0.77%
    check_snmp_stor

     10224 netsaint 1 0 0 7664K 7080K sleep 0:00 0.75%
    check_snmp_load

     10259 netsaint 1 0 0 8176K 7584K cpu/0 0:00 0.70%
    check_snmp_user

     10229 netsaint 1 0 0 7520K 6936K sleep 0:00 0.61%
    check_processes

     10247 netsaint 4 0 0 16M 7744K sleep 0:00 0.19% sqlplus

     10260 netsaint 3 0 0 8792K 6280K run 0:00 0.12% nagios

     10250 netsaint 1 0 0 3600K 2792K run 0:00 0.07% ssh

      1062 netsaint 1 59 0 3360K 1232K sleep 6:58 0.05% ssh-agent

         1 root 1 58 0 856K 280K sleep 90:43 0.04% init

      8138 apache 3 50 0 10M 2952K sleep 0:00 0.04% httpd

      9176 netsaint 1 59 0 2824K 1704K cpu/1 0:00 0.04% top

     10237 netsaint 1 0 0 2552K 1880K sleep 0:00 0.02%
    check_oracle

     10253 netsaint 3 0 0 8792K 1800K sleep 0:00 0.02% nagios

     10245 netsaint 1 0 0 2552K 1224K sleep 0:00 0.02%
    check_oracle

    How is it possible that a proces nagios with only 5 LWPS can stress the
    cpu to a load of 7. I can't find a way how to show this behaviour. Can
    it be a system call thing?

    A vmstat gives:

    $ vmstat 5

     procs memory page disk
    faults cpu

     r b w swap free re mf pi po fr de sr s0 s1 s2 -- in
    sy cs us sy id

     4 0 0 2582248 582960 546 375 5 5 4 0 0 0 8 0 0 311 1407 502 63
    18 20

     6 0 0 2527464 549280 440 7143 0 8 8 0 0 0 8 0 0 288 24273 401 85
    15 0

     6 0 0 2507096 535384 484 10244 0 0 0 0 0 0 0 0 0 342 31842 566 79
    21 0

     4 0 0 2508552 529336 574 10137 0 0 0 0 0 0 0 0 0 381 29564 612 74
    23 4

     3 0 0 2511568 537584 750 9249 0 6 4 0 0 0 7 0 0 340 27504 565 65
    20 15

     6 0 0 2528312 548208 588 10524 0 1 1 0 0 0 0 0 0 375 28649 590 73
    23 4

     6 0 0 2521848 541696 488 7871 0 0 0 0 0 0 16 0 0 304 28062 462 66
    18 16

     8 0 0 2519920 539080 576 8539 0 11 9 0 0 0 8 0 0 345 24551 521 79
    18 3

     8 0 0 2500472 530104 295 8656 0 0 0 0 0 0 0 0 0 323 30986 510 79
    21 0

     7 0 0 2497000 520200 786 9454 0 0 0 0 0 0 0 0 0 353 31087 560 72
    22 7

    I hope I gave enough information to give some explenation of this.

    Regards,

    Rick

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