Hi,
I am experiencing a strange issue doing some load tests. Our setup: - 2 server with each 24 cpu cores, 130GB of RAM - 10 shards per server (needed for response times) running in a single tomcat instance - each query queries all 20 shards (distributed search) - each shard holds about 1.5 mio documents (small shards are needed due to rather complex queries) - all caches are warmed / high cache hit rates (99%) etc. Now for some reason we cannot seem to fully utilize all CPU power (no disk IO), ie. increasing concurrent users doesn't increase CPU-Load at a point, decreases throughput and increases the response times of the individual queries. Also 1-2% of the queries take significantly longer: avg somewhere at 100ms while 1-2% take 1.5s or longer. Any ideas are greatly appreciated :) Fred.
