[389-users] Re: autosizing the cache

On Tue, 2018-03-13 at 13:05 -0500, Sergei Gerasenko wrote:
> 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".

If autosize > 0, we write a new entrychace/cachememsize every start up.

So you only need to set autosize to between 1 and 99 for it to work.

There is some other logic in there to account for other scenarioes =
for example, if you set autosize to 0 AND you set the entry cachesize
to 0, we'll autosize it at start up anyway. BUT if you have autosize =
0, and entry cachesize > 0, we won't touch it.

Does that help?

>
> Thanks!
>
> > On Mar 1, 2018, at 2:55 PM, Sergei Gerasenko <gerases@gmail.com>
> > 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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> rg
--
Thanks,

William Brown
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