Hi, thanks for your response.
About the MDS cache, now I've the mds_cache_memory_limit at 8Mb. 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).
What catches my attention, is the huge difference between kernel and fuse. Why the kernel client is not notizable and the fuse client is using the most of CPU power...
Greetings.
2018-07-23 14:01 GMT+02:00 Paul Emmerich <paul.emmerich@xxxxxxxx>:
PaulHi,do you happen to have a relatively large number of clients and a relatively small cache size on the MDS?2018-07-23 13:16 GMT+02:00 Daniel Carrasco <d.carrasco@xxxxxxxxx>:______________________________Hello,I've created a Ceph cluster of 3 nodes (3 mons, 3 osd, 3 mgr and 3 mds with two active). This cluster is for mainly for server a webpage (small files) and is configured to have three copies of files (a copy on every OSD).My question is about ceph.fuse clients: I've noticed an insane CPU usage when the fuse client is used, while the kernel client usage is unnoticeable.For example, now i've that machines working with kernel client and the CPU usage is less than 30% (all used by php processes). When I change to ceph.fuse the CPU usage raise to more than 130% and even sometimes up to 190-200% (on a two cores machines means burn the CPU).Now I've seen two warnings on the cluster:1 MDSs report oversized cache4 clients failing to respond to cache pressureand I think that maybe is a lack of capabilities on ceph kernel modules, so I want to give a try to fuse module but I've the above problem.My SO is Ubuntu 16.04 x64 with kernel version 4.13.0-45-generic and ceph server/client version is 12.2.7.How I can debug why that CPU usage?.Thanks!--_________________________________________ Daniel Carrasco Marín
Ingeniería para la Innovación i2TIC, S.L.
Tlf: +34 911 12 32 84 Ext: 223
www.i2tic.com
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_________________________________________
Daniel Carrasco Marín
Ingeniería para la Innovación i2TIC, S.L.
Tlf: +34 911 12 32 84 Ext: 223
www.i2tic.com
_________________________________________
Ingeniería para la Innovación i2TIC, S.L.
Tlf: +34 911 12 32 84 Ext: 223
www.i2tic.com
_________________________________________
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