[mapserver-dev] Memory leak in mapcache

[thomas bonfort]

Hi Patrick,
What kind of requests is mapcache responding to, and at what concurrency?
Serving multiple large wms requests is typically an example where large
chunks of memory will be allocated.

--
thomas

On Fri, Apr 12, 2019 at 12:42 AM Patrick Valsecchi <
patrick.valsecchi at camptocamp.com> wrote:

> Hi,
>
> I'm using mapcache v1.6.1 (tested as well with a master build) in docker
> and I can see huge memory increases in the apache process memory usage when
> mapcache is used (it's the only thing this apache instance is serving). The
> thing is configured like that:
>
> <mapcache>
>    <cache name="default" type="memcache">
>       <server>
>          <host>prod-2-4-c2cgeoportal-memcached</host>
>          <port>11211</port>
>       </server>
>    </cache>
>
>    ...
>
>    <tileset name="map">
>      <source>map</source>
>      <cache>default</cache>
>      <grid>swissgrid_005</grid>
>      <metatile>5 5</metatile>
>      <metabuffer>128</metabuffer>
>      <format>image/png</format>
>      <expires>3600</expires> <!-- 1 hour -->
>      <auto_expire>13800</auto_expire> <!-- 4 hours -->
>   </tileset>
>
>
> I can see that memcached is used in it's stats and only mapcache uses it.
>
> But the the memory usage of the whole mapcache container looks like that:
> [image: image.png]
>
> Each dip in usage is when the OOM kills one of the apache workers (out of
> a maximum of 3 workers). I have configured a memory limit in docker at
> 512MB.
> Nothing shows up in the apache logs.
>
> Are there any known memory leaks? Do I have a bad configuration? I could
> have the apache workers restarted every 10 queries, but that would be
> utterly ugly and inefficient...
>
> Thanks for your help.
> _______________________________________________
> mapserver-dev mailing list
> mapserver-dev at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/mapserver-dev
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