> 8 threads sharing something may have *some* overhead versus 8 processes, but > as you say, 410ms overhead points to a different problem.
- You have baseline (single-threaded load-stress script sending requests to SOLR) (1-request-in-parallel, 8 requests to 8 Tomcats); 200ms looks extremely high... only if you are not GETting more than top-10000 docs in a single query (instead of default top-10).
