Swapping in 2.4.10.SuSE-3 (2.4.10aa1 + some patches).

Swapping in 2.4.10.SuSE-3 (2.4.10aa1 + some patches).

Post by Marcelo Tosatt » Wed, 03 Oct 2001 01:50:07




>         Hi, folks,

>         Kernel 2.4.10.SuSE-3 + patches from Andrea (from LKML), 1 CPU, 1 Gb RAM,
> 4 Gb swap. Mysql going to swap, but server has about 700Mb free memory:

> buran:~ # vmstat 2
>    procs                      memory    swap          io     system         cpu
>  r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
>  0  0  0 335984 686688   6392 194476   3   6   126   167  172    83   4   1  94
>  0  0  0 335984 686688   6392 194476   0   0     0     0  102    11   0   0 100

>         Result of "top" command:

>   PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND
>  1190 root       9   0  1220 1020   876 S     0.0  0.0   0:00 sh
>  1210 root       9   0   964  732   728 S     0.0  0.0   0:00 safe_mysqld
>  1245 mysql      9   0  318M  624   612 S     0.0  0.0   0:00 mysqld.42
>  1247 mysql      9   0  318M  624   612 S     0.0  0.0   0:00 mysqld.42
>  1248 mysql      9   0  318M  624   612 S     0.0  0.0   0:00 mysqld.42
>  1249 mysql      9   0  318M  624   612 S     0.0  0.0   0:17 mysqld.42
>  1250 mysql      9   0  318M  624   612 S     0.0  0.0   0:00 mysqld.42
>  1251 mysql      9   0  318M  624   612 S     0.0  0.0   0:29 mysqld.42
>  1252 mysql      9   0  318M  624   612 S     0.0  0.0   1:06 mysqld.42
>  1253 mysql      9   0  318M  624   612 S     0.0  0.0   0:00 mysqld.42
>  1254 mysql      9   0  318M  624   612 S     0.0  0.0   0:00 mysqld.42
>  1259 mysql      9   0  318M  624   612 S     0.0  0.0  26:01 mysqld.42

>         No error messages in dmesg and syslog.

>         It is normal ?

Yes.

The kernel is just preallocating swap. If there is actual swap activity,
you can see in the "si so" (swapin/swapout) fields of vmstat.

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1. VM: 2.4.10 vs. 2.4.10-ac2 and qsort()

Just rip it off NetBSD and there you go. (FreeBSD's breaks on machines
like SPARC, NetBSD's does not.)

http://www.de.freebsd.org/cgi/cvsweb.cgi/basesrc/lib/libc/stdlib/merg...
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