[OpenIndiana-discuss] /hipster: question about /proc

[Predrag Zečević - Technical Support Analyst]

On 09/29/17 15:55, Predrag Zečević - Technical Support Analyst wrote:
> Hi all,
> 
> I got today alert (actually blinking TimeSlider icon) that root FS is 
> more than 70% in use (that is my setup).
> 
> Went to check what occupies so much space, and found:
> $ pfexec du -sch /*
> ...
> 76G     /proc
> 
Correction:
$ 67G     /proc/22973

> I was confused, so:
> $ ps -Zef| grep 22973
>    global    mysql 22973     1   0   Sep 27 ?         419:56 
> /opt/MySQL/5.7_32/bin/mysqld --user=mysql --datadir=/var/MySQL/data/5.7 
> --pid-f
> 
> Well, that is self compiled 32bit version of MySQL server (we need it 
> for some reason)...
> 
> What is using so much memory (top shows almost nothing)?
> 
> After server bouncing, I got 4GB usage for MySQL PID /proc space, which 
> is normal.
> 
> Maybe my compilation leaks memory? Or MySQL setup needs tweak (some tmp 
> files created in memory)?
> 
> I am just curious if someone else spotted similar problem.
> Also, I know that I can truss process - but what if that generates 
> another big file (I cannot seat and watch truss output)?
I probably do not have reason to be worried, but still - between my 1st 
and this second mail:
$ du -shc /proc/* | sort -h
...
1,2G    /proc/4225
1,5G    /proc/4652
2,1G    /proc/10220
12G     /proc/18087
20G     total

$ ps -ef | grep -E "10220|18087"
   global predrag* 10220 10216   5   Sep 26 pts/1     978:02 
/usr/bin/firefox --setDefaultBrowser --profile 
/export/home/predrag_zecevic/.mo
   global predrag* 18247  7600   0 16:03:08 pts/13      0:00 grep -E 
10220|18087
   global    mysql 18087     1   0 15:41:31 ?           4:04 
/opt/MySQL/5.7_32/bin/mysqld --user=mysql --datadir=/var/MySQL/data/5.7 
--pid-f

(please note that MySQL instance is used for some testing)
> 
> Regards.
> 
> P.S: rpool is installed to 256GB SSD drive, and /opt and /var/MySQL are 
> located on HD zfs file systems

-- 
Predrag Zečević
Technical Support Analyst
2e Systems GmbH

tel: +49 - 6196 - 95058 - 15
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e-mail: predrag.zecevic at 2e-systems.com

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