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From Russell Bahr <r...@manzama.com>
Subject Re: upgrading from solr4 to solr8 searches taking 4 to 10 times as long to return
Date Thu, 05 Sep 2019 16:51:14 GMT
Hi Shawn,
Sorry for the other link.  I figured out after I sent the first one how to
share the entire folder.  Please try this link and let me know if that
works.

https://www.dropbox.com/sh/hslknixd3azj7mi/AABnCXex_HInCvRz3kuKLwNna?dl=0

I will pull the GC logs and save them up to the same folder link.
Thank you,
Russ


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On Thu, Sep 5, 2019 at 9:38 AM Shawn Heisey <apache@elyograg.org> wrote:

> On 9/4/2019 12:48 PM, Russell Bahr wrote:
> > Thank you for the feedback and advise.  I have loaded the 2 screenshots
> up
> > to drop box.  Here is the link.
> >
> >
> https://www.dropbox.com/s/c5b41a61za0ojw7/solr4_Screen%20Shot%202019-09-03%20at%203.37.08%20PM.png?dl=0
>
> Just one screenshot there.
>
> Looking at that, I'm guessing that you have a heap size between 11 and
> 12 GB, and about 7GB of index data.  A little more than 3GB of your
> system memory is being used for disk caching.  So you can fit about half
> your index into the cache.
>
> I would not ordinarily expect a situation like this to have such bad
> performance, so there may be something going on that isn't
> straightforward to see here.  One possible problem is that your install
> actually needs a bigger heap than you have, so it's spending a lot of
> time doing garbage collection.  If this is what's happening, you
> probably are going to need more than 16GB total memory.
>
> What is the total document count for that 7GB of index data?
>
> Solr 4 likely isn't writing a GC log, but Solr 8 probably is.  Can you
> share those logs?
>
> Thanks,
> Shawn
>

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