Re: stuck MDS warning: Client HOST failing to respond to cache pressure

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On 17/10/2023 11:27, Frank Schilder wrote:
Hi Stefan,

probably. Its 2 compute nodes and there are jobs running. Our epilogue script will drop the caches, at which point I indeed expect the warning to disappear. We have no time limit on these nodes though, so this can be a while. I was hoping there was an alternative to that, say, a user-level command that I could execute on the client without possibly affecting other users jobs.

Hello,
If you know the names of the files to flush from the cache (from /proc/$PID/fd, lsof, batch job script, ...), you can use something like https://github.com/tortay/cache-toys/blob/master/drop-from-pagecache.c on the client.

See comments line 16 to 22 of the source code for caveats/limitations.


Loïc.
--
|       Loīc Tortay <tortay@xxxxxxxxxxx> - IN2P3 Computing Centre      |
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