/** * Calls garbage collector and wait. * * @throws Exception if any thread has interrupted the current thread while waiting. */ private void gc() throws Exception { Runtime rt = Runtime.getRuntime(); long freeMem0 = rt.freeMemory(); long freeMem = Long.MAX_VALUE; int cnt = 0; while (freeMem0 < freeMem && cnt < GC_CALL_CNT) { System.gc(); U.sleep(WAIT_TIME); cnt++; freeMem = freeMem0; freeMem0 = rt.freeMemory(); } }