: It looks like warmup queries execute sequentially. : : Considering servers have N CPU cores these days, would it make sense : to make them (optionally) run in parallel? This should help with : cases where warmup queries are CPU bound by letting Solr use more than : 1 thread and thus more than 1 CPU core. Should I add to JIRA?
It's something we've talked about before, so there may already be one. One reason it's never been super high on my priority list: in the newSearcher case, where you are actively serving "live" searches against the old searcher, you probably don't want to risk CPU contention by spinning up a bunch of new threads to hammer the newSearcher with warming queries. the main place parallelized warming queries would be handy is on firstSearcher -- but since server startup / core reload should be a fairly low occurance situation in a production deployment , there were always bigger fish to fry in terms of improving solr. -Hoss
