Hi Loïc,
I don't have any tests specifically for this, but looking at #39057, I
wonder if something could be crafted using the check_shard_select test
that Adam wrote as a template. What do you think?
Mark
On 3/16/21 3:52 PM, Loïc Dachary wrote:
Hi Mark,
While trying to figure out a random failure in the mempool tests[0] introduced when fixing a bug in how mempool selects shards holding the byte count of a given pool[1] earlier this year, I was intrigued by this "cache line ping pong" problem[2]. And I wonder if you have some kind of benchmark, somewhere in your toolbox, that someone could use to demonstrate the problem. Maybe such a code could be adapted to show the benefit of the optimization implemented in mempool?
Cheers
[0] https://tracker.ceph.com/issues/49781#note-9
[1] https://github.com/ceph/ceph/pull/39057/files
[2] https://www.drdobbs.com/parallel/understanding-and-avoiding-memory-issues/212400410
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