Yeah, is also my thread. This thread was created before lower the cache size from 512Mb to 8Mb. I thought that maybe was my fault and I did a misconfiguration, so I've ignored the problem until now.
Greetings!
El mar., 24 jul. 2018 1:00, Gregory Farnum <gfarnum@xxxxxxxxxx> escribió:
On Mon, Jul 23, 2018 at 11:08 AM Patrick Donnelly <pdonnell@xxxxxxxxxx> wrote:On Mon, Jul 23, 2018 at 5:48 AM, Daniel Carrasco <d.carrasco@xxxxxxxxx> wrote:
> Hi, thanks for your response.
>
> Clients are about 6, and 4 of them are the most of time on standby. Only two
> are active servers that are serving the webpage. Also we've a varnish on
> front, so are not getting all the load (below 30% in PHP is not much).
> About the MDS cache, now I've the mds_cache_memory_limit at 8Mb.
What! Please post `ceph daemon mds.<name> config diff`, `... perf
dump`, and `... dump_mempools ` from the server the active MDS is on.
> I've tested
> also 512Mb, but the CPU usage is the same and the MDS RAM usage grows up to
> 15GB (on a 16Gb server it starts to swap and all fails). With 8Mb, at least
> the memory usage is stable on less than 6Gb (now is using about 1GB of RAM).
We've seen reports of possible memory leaks before and the potential
fixes for those were in 12.2.6. How fast does your MDS reach 15GB?
Your MDS cache size should be configured to 1-8GB (depending on your
preference) so it's disturbing to see you set it so low.See also the thread " Fwd: MDS memory usage is very high", which had more discussion of that. The MDS daemon seemingly had 9.5GB of allocated RSS but only believed 489MB was in use for the cache...-Greg
--
Patrick Donnelly
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