Re: Did something change with ZFS and vnode caching?
- In reply to: Garrett Wollman : "Re: Did something change with ZFS and vnode caching?"
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Date: Mon, 11 Sep 2023 18:20:32 UTC
<<On Mon, 11 Sep 2023 00:26:15 -0400, I wrote: > That was ... interesting. It took a bit of postprocessing, but I was > able to make a flame chart from that: > <https://people.csail.mit.edu/wollman/contention.svg> When I originally did this I thought that it made the most sense to organize by the stack and then the lock name, but after staring at it for a few hours, I decided that it might be more helpful to see it aggregated by lock first and then stacks, so I switched it around: <https://people.csail.mit.edu/wollman/contention-bylock.svg> Note that in order to reproduce these flame graphs, you'll have to make a new version of Gregg's stackcollapse.pl that removes the weird behavior the original version has for names with "->" in them, as well as doing some additional postprocessing. -GAWollman