/**
* 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();
}
}
