solr perf

[Matthieu Labour]

Hi
I have a slr instance in which i created 700 core. 1 Core per user of my
application.
The total size of the data indexed on disk is 35GB with solr cores going
from 100KB and few documents to 1.2GB and 50 000 documents.
Searching seems very slow and indexing as well
This is running on a EC2 xtra large instance (6CPU, 15GB Memory, Raid0 disk)
I would appreciate if anybody has some tips, articles etc... as what to do
to understand and improve performance
Thank you