26 Apr
2024
26 Apr
'24
11:27 p.m.
Hi Erich,
Erich Weiler schreef op 2024-04-23 15:47:
So I'm trying to figure out ways to reduce the
number of warnings I'm
getting and I'm thinking about the one "client failing to respond to
cache pressure".
Is there maybe a way to tell a client (or all clients) to reduce the
amount of cache it uses or to release caches quickly? Like, all the
time?
I know the linux kernel (and maybe ceph) likes to cache everything for
a while, and rightfully so, but I suspect in my use case it may be more
efficient to more quickly purge the cache or to in general just cache
way less overall...?
We have many thousands of threads all doing different things that are
hitting our filesystem, so I suspect the caching isn't really doing me
much good anyway due to the churn, and probably is causing more
problems than it helping...
We are seeing "client failing to respond to cache pressure" on a daily
basis.
Remounting on the client usually 'fixes' the issue. Sometimes,
remounting on all clients that have the same directory mounted is
needed. Also, a larger MDS cache seems to help.
As Dietmar said, VS Code may cause this. Quite funny to read, actually,
because we've been dealing with this issue for over a year, and
yesterday was the very first time Ceph complained about a client and we
saw VS Code's remote stuff running. Coincidence.
-erich
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