Re: [squid-users] High CPU usage problem on Squid 2.6 STABLE9

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Hi Robert,

Could you provide output from:

    uname -a
    uptime
    cat /proc/stat
        

I am not a big fan of top - as the output can be very confusing to read.

How many processors are in this box? Hyperthreading? (We will see
this in
/proc/stat).

Assuming you have a 4 processor (or 2 proc with Hyperthreading) box,
vmstat
showing 25% user could mean 100% on one processor as squid only uses
one process.

the value that concerns me the most from the vmstat output are the
busy, system and
interrupt columns. This looks as if it is the network driver, as
'bytes out'
seems rather low. iowait seems ok - this could be causing the 'busy'.
System time
is fairly high - once again pointing towards driver issues.

What sort of network card do you have installed in your system?
Or what is generating sooo many interupts.

Regards

Andrew

On 30/01/2007, at 4:46 PM, Robert wrote:

> When top shows cpu usage between 70-99% command vmstat 5 shows:
>
> procs -----------memory---------- ---swap-- -----io---- --system--
> ----cpu----
> r b swpd free buff cache si so bi bo in cs
> us sy id wa
> 3 0 2572 52232 200152 274692 0 0 3 3 1 0
> 2 13 81 4
> 1 0 2572 52888 199716 272884 0 0 50 698 9068 525
> 5 20 63 12
> 1 0 2572 52336 199772 273576 0 0 50 434 9128 485
> 7 19 69 5
> 3 2 2572 54184 198624 270916 0 0 112 1011 7001 808
> 15 25 49 10
> 1 1 2572 58048 198848 272732 0 0 166 232 7558 884
> 9 24 55 12
> 1 0 2572 56588 198888 273304 0 0 45 1242 9288 544
> 5 19 68 9
> 1 0 2572 55568 199044 274576 0 0 167 634 7487 831
> 8 25 56 11
> 1 0 2572 54032 199168 275744 0 0 104 1072 8195 895
> 6 24 55 16
> 1 0 2572 52148 199288 277256 0 0 84 805 8081 753
> 7 24 57 12
> 1 0 2572 52068 199084 275692 0 0 105 1138 8166 890
> 6 24 58 13
> 1 0 2572 52480 199032 272548 0 0 22 529 9144 562
> 4 22 69 5
> 1 1 2572 54472 199080 271208 0 0 66 465 7343 806
> 9 25 58 7
> 3 0 2572 52652 199172 272340 0 0 70 463 8120 631
> 9 24 59 8
> 1 0 2572 52540 199316 271856 0 0 78 856 8125 755
> 6 25 56 13
> 2 0 2572 52948 198744 270388 0 0 46 678 9202 506
> 2 23 70 5
> 1 1 2572 52472 198788 270888 0 0 26 818 9274 535
> 2 23 66 9
> 3 0 2572 52540 198888 271264 0 0 62 646 8094 597
> 9 24 61 6
> 0 2 2572 54552 198140 270720 0 0 122 1262 6174 1141
> 11 28 42 19
> 3 1 2572 54160 197636 268572 0 0 111 90 8258 800
> 5 26 59 10
> 1 0 2572 51808 197740 269692 0 0 37 1314 7916 936
> 6 25 51 18
> 1 0 2572 53616 197112 267260 0 0 14 1075 9456 499
> 4 22 67 8
> 1 0 2572 59748 197276 267844 0 0 94 838 8461 440
> 8 22 61 10
> 1 0 2572 59284 197352 268040 0 0 26 612 9099 467
> 7 19 71 4
> 1 0 2572 59168 197456 268548 0 0 32 676 8672 536
> 7 21 65 7
> 1 1 2572 58048 197544 269072 0 0 36 637 8985 465
> 7 19 70 5
> 1 1 2572 59060 197664 270516 0 0 155 227 7027 783
> 15 25 52 8
> 1 0 2572 56544 197760 271372 0 0 61 461 8933 489
> 7 19 67 7
> 1 0 2572 53568 197816 272132 0 0 25 651 9120 458
> 6 20 70 4
> 1 0 2572 51508 197884 272540 0 0 51 626 9041 557
> 7 19 69 5
> 1 0 2572 52144 198008 271328 0 0 22 754 9055 717
> 6 19 69 6
> 1 0 2572 51112 198088 271588 0 0 61 653 9170 495
> 7 19 67 7
> 2 1 2572 55004 198132 269844 0 0 165 593 6276 955
> 16 27 43 14
> 1 0 2572 57088 198220 270436 0 0 65 544 7785 544
> 9 23 60 9
> 1 1 2572 55604 198264 271344 0 0 69 476 8552 603
> 6 22 67 5
> 1 2 2572 54268 198340 272560 0 0 86 388 8723 540
> 6 21 69 4
> 1 0 2572 51936 198360 272880 0 0 22 338 9220 473
> 5 20 68 6
> 1 0 2572 55432 197760 270556 0 0 32 341 9046 454
> 5 22 70 4
> 1 0 2572 55048 197848 271216 0 0 34 520 9151 397
> 4 21 69 6
> 1 0 2572 54148 197908 271632 0 0 54 461 9075 480
> 4 21 67 7
> 1 0 2572 52904 197996 271884 0 0 51 378 9049 422
> 4 21 71 4
> 1 0 2572 52648 198084 272136 0 0 96 505 8308 567
> 7 24 60 9
> 2 0 2572 53952 198136 272900 0 0 57 510 8533 503
> 6 24 63 7
>
> top:
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
> COMMAND
> 31333 squid 18 0 931m 929m 2280 R 93.4 45.8
> 629:37.67 squid
>
> top -U squid:
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 31333 squid 18 0 932m 929m 2280 R 93.0 45.9 631:54.86 squid
> 31335 squid 15 0 2124 764 652 S 1.0 0.0 6:29.93 diskd-
> daemon
> 31336 squid 15 0 2128 764 652 S 0.7 0.0 6:25.22 diskd-
> daemon
> 31337 squid 15 0 2124 756 648 S 0.3 0.0 6:30.15 diskd-
> daemon
> 31334 squid 18 0 1404 280 224 S 0.0 0.0 0:00.22 unlinkd
>
> cpu load is visible on browsing sites (latency),
>
> Regards
> Robert

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Received on Tue Jan 30 2007 - 09:12:48 MST