Hi guys, Thanks a lot for the cogent feedback, much appreciated. I'll group my answers in one message.
1- (Charlie): regarding the type of queries I make: here is a typical one; it's fairly vanilla, no faceting or anything fancy. q=+((titleStart:"was sixteen")(subTitleStart:"was sixteen"))+(participantStart:"fairport convention")&fq=+(type:COCV) 2- (Erick): correct, my index is not sharded, and there is no SolrCloud for the test. In a production env, I will setup a SolrCloud, but I think I need to understand what's going on here first. It's a medium-size index (30 million docs). I did a sharded test and the performance was worse on 2 servers / 2 shards, than 2 servers / same single shard on each. 3- (Walter): regarding the cache situation : you may be on to something; this is what I observed: document cache: hitrate 0.38 (1 server condition) / 0.26 (on each of the 2 servers) filter cache : hitrate 1 in both conditions query result cache : hitrate 0.24 (1 server) / 0.14 (on each of the 2 servers) Is it possible this is the issue? My batch issues ~300,000 queries, corresponding to ~150,000 unique queries. Will look into Varnish, thanks for the pointer. Yannick
