On 09/08/2016 09:47 AM, Wangzhiyuan wrote:
Hi guys
I am testing the performance of blue store backend on PCIE SSD with ceph jewel 10.2.2 and I found that the 4K random write performance is bad because of large write amplification.
After I got some recently change log which related to this issue. I upgrade to the latest code, and I was so surprised that the performance was much better. But there is an issue that the memory is out after running tens of minutes. Does anyone have idea about the issue. I know the code is not stable, but I eager for great performance.
How old is your master pull? PR #11011 just got merged this morning
that should improve memory usage dramatically, but there might still be
issues (just not as bad).
https://github.com/ceph/ceph/pull/11011
Also, you might see rocksdb stalls with small random writes. If so, try
setting bluefs_buffered_io to true. We're still figuring out how to
deal with it so it might not be necessary in the long run.
Mark
Thanks a lot
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