Hi everyone,
currently I am taking some performance measurements on a Solr
installation and I am trying to figure out if what I see mostly fits
expectations:
The data is as follows:
- solr 4.8.1
- 8 millon documents
- mostly office documents with real text content, stored
- index size on disk 90G
- full index memory mapped into virtual memory:
- this is a on a vmware server, 4 cores, 16 GB RAM
PID PR NI VIRT RES SHR S %CPU %MEM TIME+ nFLT
961 20 0 93.9g 10g 6.0g S 19 64.5 718:39.81 757k
When I start running a jmeter query test sending requests as fast a
possible with a few threads, it peaks at about 4 qps with a real-world
query replay of mostly 1, 2, sometimes more terms.
What I see are around 150 to 200 major page faults per second, meaning
that Solr is not really happy with what happens to be in memory at any
instance in time.
My hunch is that this hints at a too small RAM footprint. Much more RAM
is needed to get the number of major page faults down.
Would anyone agree or disagree with this analysis. Someone out there
saying "200 major page faults/second are normal, there must be another
problem"?
Thanks,
Harald.
