gistfile1.txt

@Test
    public void testToFindEntryCountFactor() {
        final ICache cache = createCache();
        final Random random = new Random();
        final int size = 1000;
        for (int i = 0; i < size; i++) {
            cache.put(i, random.nextInt(size));
        }

        ///////////////////////////////////////////////////////////////////////////////////

        HazelcastServerCacheManager hscm = (HazelcastServerCacheManager) cacheManager;
        EnterpriseCacheService ecs = (EnterpriseCacheService) hscm.getCacheService();
        int partitionCount = ecs.getNodeEngine().getPartitionService().getPartitionCount();

        ///////////////////////////////////////////////////////////////////////////////////

        int totalSize = 0;
        System.out.println(partitionCount);
        for (int partitionId = 0; partitionId < partitionCount; partitionId++) {
            ICacheRecordStore crs = ecs.getCacheRecordStore("/hz/" + cache.getName(), partitionId);
            totalSize += crs.size();
        }
        final int averageSize = (int) ((double) totalSize / (double)partitionCount);

        System.out.println("log: Total size: " + totalSize + ", Average size: " + averageSize);

        ///////////////////////////////////////////////////////////////////////////////////

        double sizeDiffRatio = 0;
        for (int partitionId = 0; partitionId < partitionCount; partitionId++) {
            ICacheRecordStore crs = ecs.getCacheRecordStore("/hz/" + cache.getName(), partitionId);
            sizeDiffRatio += (double) averageSize / (double) crs.size();
        }
        final double averageSizeDiffRatio = sizeDiffRatio / partitionCount;

        System.out.println("log: Total size diff ratio: " + sizeDiffRatio +
                ", Average size diff ratio: " + averageSizeDiffRatio);

        ///////////////////////////////////////////////////////////////////////////////////

        int deviation = 0;
        for (int partitionId = 0; partitionId < partitionCount; partitionId++) {
            ICacheRecordStore crs = ecs.getCacheRecordStore("/hz/" + cache.getName(), partitionId);
            deviation += Math.pow((crs.size() - averageSize), 2);
        }
        final double variation = (double) deviation / (double) partitionCount;
        final double standardDeviation = Math.sqrt(variation);

        System.out.println("log: Variation: " + variation + ", Standard deviation: " + standardDeviation);
    }