[Glass] gc related to cache size

[Dale Henrichs]

Ah okay ... Yes an MFC on a repository that is larger than the SPC can
result in noticeable performance issues for general users ...

You have a couple of choices:
  1. schedule MFC during off hours
    - avoid hitting users with MFC issues
  2. run EpochGc to incrementally collect garbage
    - this minimizes repository growth between MFCs
  3. run offline gc (see FDC/MGC in manual)
    - the scan is done in a separate stone/SPC and the production SPC
      isn't perturbed by the scan for" disconnected objects". the mark step
is
      would still be performed in the production SPC

The "only cost" to running less frequent MFC (say on the weekends) is that
your repository will grow larger ... EpochGc is a good option for Seaside,
because the bulk of the persistent garbage is produced by Seaside session
state and an hourly epoch will gc a good portion of the Seaside session
garbage ... The garbage produced around Epoch boundaries is not caught by
EpochGc and garbage produced by objects with a longer lifetime than the
epoch will also not be caught, so it is necessary to still run periodic
MFCs ...

Dale


On Sun, Jan 26, 2014 at 11:19 AM, Leo De Marco (Smalltalking) <
leo at smalltalking.net> wrote:

> Dale,
>
>
>
> I'm not getting any particular error. The problem is with some reports,
>
> when the users use that functionality the system go down in performance.
>
>
>
> I have a pending issue to review that’s reports, but in the meanwhile
>
> it would be great to have a way to perform the clean cache script when
>
> reach some number.
>
>
>
> Leo
>
>
>
> *De:* Dale Henrichs [mailto:dale.henrichs at gemtalksystems.com]
> *Enviado el:* viernes, 24 de enero de 2014 15:42
> *Para:* leo at smalltalking.net
> *CC:* GemStone Seaside beta discussion
> *Asunto:* Re: [Glass] gc related to cache size
>
>
>
> Leo,
>
>
>
> I'm not familiar with the "cache is too big" condition .... what error
> message do you get?
>
>
>
> On Fri, Jan 24, 2014 at 10:35 AM, <leo at smalltalking.net> wrote:
>
> Hi all!
>
>
>
> I have a script for garbage collect that runs every day at night in my
> maintenance plan. But sometimes the cache is too big before that script
> run, so I have to manually execute the script.
>
>
>
> There is a way to automatically perform the script when cache size reach
> some predefine number?
>
>
>
> thnks in advance!
>
> Leo
>
>
> _______________________________________________
> Glass mailing list
> Glass at lists.gemtalksystems.com
> http://lists.gemtalksystems.com/mailman/listinfo/glass
>
>
>
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