group.ngroups=true is always going to be somewhat expensive, but in your
case it seems more expensive than I would expect. You should check to see
that you have enough Java JVM heap to hold more of the index and to avoid
any excessive GCs.
-- Jack Krupansky
-----Original Message-----
From: Mickael Magniez
Sent: Wednesday, January 09, 2013 10:09 AM
To: solr-user@lucene.apache.org
Subject: Performance issue with group.ngroups=true
Hi,
I have a performance issue with group.ngroups=true parameters.
I have an index with 100k documents (small documents, 1-10 documents per
group, group on string field), if i make a q=*:*&...&group.ngroups=true i
have 4s responsetime vs 50ms without the ngroups parameters.
Is it a workaround for this problem?
Mickael
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