[stgt] tgtd memory usage

[FUJITA Tomonori]

On Fri, 1 Apr 2011 10:53:09 +0400
Степан Фёдоров <stepan.fedorov at clodo.ru> wrote:

> Each target has one real LUN:
> 
> USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
> 0 targets ~1Gb:
> root     19675  0.1  9.7 1247120 1198808 ?     SLs  Mar30   4:51 /usr/sbin/tgtd
> 
> 1 target:
> root     19675  0.1  9.7 1247120 1198808 ?     SLsl Mar30   4:51 /usr/sbin/tgtd
> 
> 10 targets:
> root     19675  0.1  9.7 1542176 1199096 ?     SLsl Mar30   4:51 /usr/sbin/tgtd
> 
> 20 targets:
> root     19675  0.1  9.7 1870016 1199416 ?     SLsl Mar30   4:51 /usr/sbin/tgtd
> 
> 30 targets:
> root     19675  0.1  9.7 2197856 1199736 ?     SLsl Mar30   4:51 /usr/sbin/tgtd
> 
> 40 targets:
> root     19675  0.1  9.7 2525696 1200056 ?     SLsl Mar30   4:51 /usr/sbin/tgtd
> 
> 50 targets:
> root     19675  0.1  9.7 2853536 1200376 ?     SLsl Mar30   4:51 /usr/sbin/tgtd
> 
> 100 targets:
> root     19675  0.1  9.7 4492736 1201976 ?     SLsl Mar30   4:52 /usr/sbin/tgtd
> 
> 200 targets:
> root     19675  0.1  9.7 7771136 1205176 ?     SLsl Mar30   4:52 /usr/sbin/tgtd
> 
> 400 targets:
> root     19675  0.1  9.8 14327936 1211576 ?    SLsl Mar30   4:56 /usr/sbin/tgtd
> 
> This 14327936, is more than memory physically installed on this node
> (12Gb), and i don't know what will happen, if tgtd will try to use all
> of this memory.

If user system has swap memory, tgtd can continue to work, I think.

> So, we can see increasing VSZ field by about 30Mb per one LUN.

per one target with one lun?

Anyway, still need to investigate why we use so much memory.
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