hi, We are doing stress tests to our service which it's underlying data layer is jena TDB. one of our tests is tor run heavy queries for long time (about 6 Hrs) and afterwards run light queries. (we have clients which are in that mode). What we witness is a huge performance degradation, light queries which usually took around 0.1-0.2 sec after the heavy queries execution took more than 3 seconds.
Also the heavy query execution had a huge performance degradation after only one minute: each heavy query fetched around 35000 triplets and for the first minutes it took between 10-40 seconds (which is OK), afterwards it peaked to 200-8000 seconds. Same thing memory wise, after a minute it peaked from 200mg to 2.2g. What I would like to know is if there could be memory leak in jena, or whether jena objects are cached in some way and maybe we can release them. Here are important details for answering: *jena version: 2.6.4* *tdb version: 0.8.9* *arq: 2.8.7* *we use a single model and no datasets.* Also can an upgrade to jena latest stable version help us here ? Help is much appreciated :) Thanks, Nadav
