Dear lucene
In order to test the solr search performance ，I closed all the cache solr
[cid:image001.png@01CEE0AA.39ECDE90]
insert into the 10 million data，and find the first search very
slowly（700ms），and the secondary search very quick（20ms），I am sure no solr cache。
This problem bothering
Solr uses the MMap Directory by default.
What you see is surely a filesystem cache.
Once a file is accessed, it's memory mapped.
Restarting solr won't reset it.
On unix, you may reset this cache with
echo 3 /proc/sys/vm/drop_caches
Franck Brisbart
Le mercredi 13 novembre 2013 à 11:58
I have to ask a different question: Why would you disable
the caches? You're trying to test worst-case times perhaps?
Because the caches are an integral part of Solr performance.
Disabling them artificially reduces your performance
numbers. So disabling them is useful for answering the question
