Hi all,
I have already know that luminous would use more memory for bluestore cache
than the config setting, but I was expecting 1.5x not 7-8x.
below is my bluestore cache setting
[osd]
osd max backfills = 4
bluestore_cache_size = 134217728
bluestore_cache_kv_max = 134217728
osd client message size cap = 67108864
My osd nodes have only 2G memory and I ran 2 osds per node.So I set the
cache value very low.
I was running a read throughput test and then found some of my osds were
killed by oom killer and restarted.I found the oom killed osd used much more
memory for bluestore_cache_data than the normal ones.
The oom killed osd used 795MB ram in mempool and 722MB in
bluestore_cache_data
The normal osd used about 120MB ram in mempool and 17MB in
bluestore_cache_data
graph of memory useage of the oom killed osd:
https://pasteboard.co/H1GzihS.png
graph of memory useage of the nomral osd: https://pasteboard.co/H1GzaeF.png
Is this a bug of bluestore cache or I misunderstood the meaning of
bluestore cache setting in config?
2018-01-06
lin.yunfan_______________________________________________
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