private Map<String, Long> getJVMStat() {
		Runtime runtime = Runtime.getRuntime();

		Map<String, Long> stat = new HashMap<>();
		stat.put("used", runtime.totalMemory() - runtime.freeMemory());
		stat.put("free", runtime.freeMemory());
		stat.put("total", runtime.totalMemory());
		stat.put("max", runtime.maxMemory());

		return stat;
	}
Get current jvm stat

@return map for jvm used/free/total/max
ngrinder-controller/src/main/java/org/ngrinder/operation/cotroller/StatisticsApiController.java