Multiple chronicle maps in same application causing long GC pauses

Question

I'm creating multiple chronicle maps just to avoid contention between threads. I have 10 threads that need something from the cache. With a single cache I observed continuously increasing putAll() [putting 2016 double[3][2] arrays) with each putAll] times (up to 2.6 seconds). So I put in 10 caches avoiding contention by making keys in a cache never collide with another thread. The GC pauses came out to be as long as 45 seconds compared to ~ 50 ms with a single chronicle map.

  private final ChronicleMap<CharSequence, double[][]>[] cache = new ChronicleMap[totalCaches];

    for (int i = 0; i < totalCaches; i++) {
      try {
        cache[i] =
            ChronicleMap.of(CharSequence.class, double[][].class)
                .entriesPerSegment(1000000)
                .averageKeySize(44.0)
                .averageValueSize(119.0)
                .entries(40320000)
                .maxBloatFactor(10.0)
                .name(CACHE_NAME.concat(String.valueOf(i)))
                .putReturnsNull(true)
                .createOrRecoverPersistedTo(
                    new File(
                        "/var/opt/cache/"
                            .concat(CACHE_NAME)
                            .concat(String.valueOf(i))
                            .concat(".dat")));
      } catch (final IOException e) {
        LOGGER.error("GA cache init error", e);
      }
    }

Another problem is that I tried specifying constantValueBySample with a double[][] object and it threw exception stating value size should be 119 which doesn't make sense.

    double[][] sample = new double[][]{{Math.random(), Math.random()},
                                       {Math.random(), Math.random()},
                                       {Math.random(), Math.random()}}; 
    for (int i = 0; i < totalCaches; i++) {
      try {
        cache[i] =
            ChronicleMap.of(CharSequence.class, double[][].class)
                .entriesPerSegment(1000000)
                .averageKeySize(44.0)
                .constantValueSizeBySample(sample)
                .entries(40320000)
                .maxBloatFactor(10.0)
                .name(CACHE_NAME.concat(String.valueOf(i)))
                .putReturnsNull(true)
                .createOrRecoverPersistedTo(
                    new File(
                        "/var/opt/cache/"
                            .concat(CACHE_NAME)
                            .concat(String.valueOf(i))
                            .concat(".dat")));
      } catch (final IOException e) {
        LOGGER.error("GA cache init error", e);
      }
    }