Hi Reinaldo, Which version of Solr do you use and could you share your cache settings?
On the other hand, did you check here: https://cwiki.apache.org/confluence/display/SOLR/SolrPerformanceProblems Kind Regards, Furkan KAMACI On Thu, Jun 25, 2020 at 11:09 PM Odysci <ody...@gmail.com> wrote: > Hi, > > I have a solrcloud setup with 12GB heap and I've been trying to optimize it > to avoid OOM errors. My index has about 30million docs and about 80GB > total, 2 shards, 2 replicas. > > In my testing setup I submit multiple queries to solr (same node), > sequentially, and with no overlap between the documents returned in each > query (so docs do not need to be kept in cache) > > When the queries return a smallish number of docs (say, below 1000), the > heap behavior seems "normal". Monitoring the gc log I see that young > generation grows then when GC kicks in, it goes considerably down. And the > old generation grows just a bit. > > However, at some point i have a query that returns over 300K docs (for a > total size of approximately 1GB). At this very point the OLD generation > size grows (almost by 2GB), and it remains high for all remaining time. > Even as new queries are executed, the OLD generation size does not go down, > despite multiple GC calls done afterwards. > > Can anyone shed some light on this behavior? > > I'm using the following GC options: > GC_TUNE=" \ > > -XX:+UseG1GC \ > > -XX:+PerfDisableSharedMem \ > > -XX:+ParallelRefProcEnabled \ > > -XX:G1HeapRegionSize=4m \ > > -XX:MaxGCPauseMillis=250 \ > > -XX:InitiatingHeapOccupancyPercent=75 \ > > -XX:+UseLargePages \ > > -XX:+AggressiveOpts \ > > " > Thanks > Reinaldo >
