At 09:21 AM 8/23/2016 -0400, Barton Chittenden wrote:
Zebra tends to be I/O bound -- we've seen it write enormous .zrs files to disk (~16G/query on large libraries). Bug 13665 mentions that searches could be taking upwards of 40 seconds to complete -- I think that we've seen searches time out and return no results at about 1 minute.

When I looked into "speed" some time ago <http://navalmarinearchive.com/z_koha/>, it was the fact that multi-core processing was not possible (Intel 8-core I7 machine.)  Speed is the only reason that we decided to stay with 3.8.24 rather than upgrade.

Best -- Paul


Is it possible to tune Zebra's space/time optimizations in any way so that it doesn't write such large files to disk?

On Tue, Aug 23, 2016 at 5:38 AM, Jonathan Druart <jonathan.druart@bugs.koha-community.org> wrote:
See bug 13665 - Retrieve facets from zebra is slow
To understand why and when use_zebra_facet=1 is slow

2016-08-22 21:31 GMT+01:00 Barton Chittenden <barton@bywatersolutions.com>:
> I haven't run into the issue with the dashes in idzebra-2.0 2.0.59, but I
> have run into this, when using ICU-Chains:
>
> Bug 16581 : ICU tokenization bug in idzebra-2.0 2.0.59-1
> URL       : https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=16581
> Priority  : P5 - low
> Urgency   : enhancement
> Status    : NEW
>
> I also know that when use_zebra_facets was first introduced, it was *very*
> slow -- I can't find any bugs about that though. It's possible that it got
> so slow under idzebra-2.0 2.61 that the searches are timing out.
>
> It should be possible to set the logging for zebra so that you can see the
> PQF queries:
>
> See
>
> Bug 15714 : Remove zebra.log from debian scripts and add optional log levels
> URL       : https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15714
> Priority  : P5 - low
> Urgency   : enhancement
> Status    : RESOLVED
>
> For setting the log levels
>
> And http://koha.1045719.n5.nabble.com/Improving-Zebra-logging-td5861827.html
>
> For a general discussion of how to use them.
>
> ... This should give you some idea of what's failing, both in terms of the
> dashes in 2.0.59 and the non-functional zebra facets under 2.0.61.
>
> My general feeling is that 2.0.59 is irredeemably broken by bug 16581, and
> we need at least 2.0.60, but I don't have any experience with zebra facets.
>
> --Barton
>
>
>
> On Mon, Aug 22, 2016 at 2:49 PM, Mark Tompsett <mtompset@hotmail.com> wrote:
>>
>> Greetings,
>>
>> Similar problem. I hope someone has a better solution than setting it to
>> 0.
>>
>> GPML,
>> Mark Tompsett
>>
>> -----Original Message-----
>> From: Philippe Blouin
>> Sent: Monday, August 22, 2016 2:40 PM
>> To: koha-devel@lists.koha-community.org
>> Subject: [Koha-devel] 16.05, zebra and jessie
>>
>> Hello!
>>
>> We're trying to find the correction combination.  We're new on Jessie,
>> so we still have some tweaking needed...
>>
>> - By default, we get zebra 2.00.59 installed on Jessie through the
>> packages.
>> - On 16.05, we get some very bad results in the search when the itemtype
>> contains an hyphen (-), like 'A-DOC'.
>> - So we installed zebra 2.00.62.  This fixes the search...
>> - But now we do not have facets.
>> - So we set <use_zebra_facets>0</use_zebra_facets>
>> - And now we have facets.  But this feels... wrong?
>>
>> My dummy question: what is the supposedly correct version of Zebra on
>> Jessie ?
>> And we're we correct in setting the config to 0 ?
>>
>> Thanks
>> Blou
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>
>
>
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