for (int i = 0; i < 30; i++) {
            if (MemoryUtil.getUsedMemory() < current + margin) {
                break;
            }
            System.gc();
            Thread.sleep(1000L);
        }
        final long usedMemory = MemoryUtil.getUsedMemory();
        assertTrue(usedMemory + " < " + current + " + " + margin + ", " + MemoryUtil.getMemoryUsageLog(), usedMemory < current + margin);
    }