On 7/4/22 03:01, Mike wrote:
My Solr index size is around 500GB and I have 64GB of RAM. Solr eats up all
the memory and because of that PHP works very, very slowly. What can I do?
Solr is a Java program. A Java program will never directly use more
memory than you specify for the max heap size. We cannot make any
general recommendations about what heap size you need, because there is
a good chance that any recommendation we make would be completely wrong
for your install. I did see that someone recommended not going above
31G ... and this is good advice. At 32 GB, Java switches to 64-bit
pointers instead of 32-bit. So a heap size of 32 GB actually has LESS
memory available than a heap size of 31 GB.
The OS will use additional memory beyond the heap for caching the index
data, but that is completely outside of Solr's control. Note that 64GB
total memory for a 500GB index is almost certainly not enough memory,
ESPECIALLY if the same server is used for things other than Solr. I
wrote the following wiki page:
https://cwiki.apache.org/confluence/display/SOLR/SolrPerformanceProblems
Others have recommended that you run Solr on dedicated hardware that is
not used for any other purpose. I concur with that recommendation.
Thanks,
Shawn
