Re: autosizing the cache

[Sergei Gerasenko <gerases@xxxxxxxxx>]

Sorry to resurrect this thread, but I’ve upgraded to 1.3.6 and so my question is back on the table :)

My cn=userRoot,cn=ldbm database,cn=plugins,cn=config is currently:

...
nsslapd-cachesize: -1
nsslapd-cachememsize: 1543503872
nsslapd-readonly: off
nsslapd-require-index: off
nsslapd-dncachememsize: 500000000
…

But cn=config,cn=ldbm database,cn=plugins,cn=config has these settings:
...
nsslapd-cache-autosize: 10
nsslapd-cache-autosize-split: 40
…

If you remember, according to the docs, setting nsslapd-cache-autosize to a value > 0, enables autosizing for all backends regardless of their cache size settings. Is that accurate or must I set them to 0s after all? It looks like autosizing is enforced because I got an error when trying to modify the changelog backend:

modifying entry "cn=changelog,cn=ldbm database,cn=plugins,cn=config"

ldap_modify: Server is unwilling to perform (53)

        additional info: Error: "nsslapd-cachememsize" can not be updated while "nsslapd-cache-autosize" is set in "cn=config,cn=ldbm database,cn=plugins,cn=config".

Thanks!

On Mar 1, 2018, at 2:55 PM, Sergei Gerasenko <gerases@xxxxxxxxx> wrote:

I don't believe autotuning exists in 1.3.5, it was only added to 1.3.6 - sorry :-/

Ah, that makes my life a bit simpler for now :)

Also, is there a way to check that auto-tuning is working normally? Is dbmon.sh the right way?

The error log at startup will tell you what the server sets the caches to.  ldapsearch on nsslapd-dbcachesize will also return the adjusted size if I am correct, but I haven't tried it.  But like I said before... this feature is not present in 389-ds-base-1.3.5


Got it. Thanks, Mark!!

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