On 05/08/2015 07:19 PM, Gregory Farnum wrote:
On Fri, May 8, 2015 at 4:21 PM, Mark Nelson <mnelson@xxxxxxxxxx> wrote:
Hi Guys,
At the performance meeting this week we discussed the possibility of
changing how newstore handles large partial overwrites.
Er, what was the potential change?
Basically breaking the object up into fragments on overwrite so that we
don't do big updates to 4MB files behind the scenes. Instead for
overwrites of a certain size (say 1MB+) create a new fragment.
To determine if
this is useful, we look at rados bench and rbd performance of newstore at
various IO sizes. I've also included some rados bench read results as folks
were interested in those. On the graphs I've tried to mark interesting
improvements/regressions and also some questions/comments. These tests were
run without overlay which may help small IO performance in some cases.
Graphs are here:
http://nhm.ceph.com/newstore/8c8c5903_rbd_rados_tests.pdf
Thanks,
Mark
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