Re: Solaris 11 memory usage

[Nestor Urquiza]

Thanks for this Martin,

I will keep you posted now that I installed 5.7 and put the command in monitrc as recommended.

We are also getting some alerts for CPU usage spikes. Do you have a recommendation for the command to run when getting those as well?

Thanks!

- Nestor

On Wed, Oct 22, 2014 at 3:33 AM, Martin Pala <address@hidden> wrote:

Hi Nestor,

you can use something like this to get the distribution (will record the memstat output + user space distribution ... processes by RSS):

        if memory usage > 80% then exec "/bin/sh -c 'exec >> /tmp/memstat.$$; echo ___________ `date` ___________; echo ::memstat | sudo mdb -k; prstat -c -s rss 1 10'"


There was fix for memory usage report for Solaris in Monit 5.7 ... please can you upgrade to Monit 5.9? If the problem will persist - is the system where Monit is running 32-bit or 64-bit? Is it the Solaris zone?


Regards,
Martin

> On 20 Oct 2014, at 22:04, Nestor Urquiza <address@hidden> wrote:
>
> Hi Martin,
>
> Is there a way to put monit in debug mode so we get more information about the memory distribution at the moment of the alert?
>
> One thing we have noticed is that regardless how many cycles we wait to alert, the succeed message comes in the next cycle after the alert which is really weird.
>
> Thanks,
>
> - Nestor
>
> On Sun, Oct 19, 2014 at 12:32 PM, Nestor Urquiza <address@hidden> wrote:
> I am sorry about the examples but yes we do get memory utilization spikes:
>
> "mem usage of 82.6% matches resource limit [mem usage>80.0%],"
>
> It is difficult to get that information at the time of the alert though. Is there a way to put monit on debug mode or something to get exactly the memory utilization distribution?
>
> Right now everything is alright:
>
> $ sudo monit status
>
> ...
>
> System 'server'
>
>   status                            Running
>
>   monitoring status                 Monitored
>
>   load average                      [0.13] [0.12] [0.11]
>
>   cpu                               0.3%us 1.4%sy 0.0%wa
>
>   memory usage                      11822268 kB [35.2%]
>
>   swap usage                        0 kB [0.0%]
>
>   data collected                    Sun, 19 Oct 2014 12:23:47
>
> ...
>
>
>
> $ echo ::memstat | sudo mdb -k
>
> Page Summary                Pages                MB  %Tot
>
> ------------     ----------------  ----------------  ----
>
> Kernel                     591587              2310    7%
>
> ZFS File Data             1089502              4255   13%
>
> Anon                       999345              3903   12%
>
> Exec and libs               50239               196    1%
>
> Page cache                 249081               972    3%
>
> Free (cachelist)          3821104             14926   46%
>
> Free (freelist)           1587621              6201   19%
>
>
> Total                     8388479             32767
>
>
>
>
>
> Thanks,
>
> - Nestor
>
>
>
>
>
>
> On Sat, Oct 18, 2014 at 4:22 PM, Martin Pala <address@hidden> wrote:
> Hi,
>
> the attached error message ("cpu system usage ...") is for CPU test ... not related to memory usage. High "cpu system" usage may be for example sign of heavy disk I/O activity and/or swapping (memory shortage) - check vmstat output for details.
>
> If the memory usage report is problem, please can you provide output of "echo ::memstat | mdb -k" and "monit status" (just the System service part is sufficient).
>
>
> Regards,
> Martin
>
>
>
> > On 16 Oct 2014, at 16:41, Nestor Urquiza <address@hidden> wrote:
> >
> > Hi guys,
> >
> > Since we went from Solaris 10 to 11 we have seen an increase monit alerts related to memory resource utilization. We used to get no alerts even when we set the memorty threshold really low, for example:
> >
> > "...cpu system usage of 45.8% matches resource limit [cpu system usage>40.0%]"
> >
> >
> > We have incremented the threshold to 90% but still we get alerts.
> >
> > Could it be that the way monit decides what is free memory in Solaris is incorrect when using ZFS http://serverfault.com/questions/378392/how-should-i-monitor-memory-usage-performance-in-sunos-solaris
> >
> > We are running monit version 5.5 BTW which has been working fine for ages.
> >
> > Perhaps version 5.9 has done something in that regard as I read the release notes ( http://mmonit.com/monit/changes/ ) are allowing to monitor generic device strings (not related really but worth to ask).
> >
> > Thanks!
> >
> > - Nestor
> >
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>
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