}

    /**
     * Sets the concurrency level that will be used by the to-be-built {@link Interner}.
     *
     * @see MapMaker#concurrencyLevel(int)
     */
    @CanIgnoreReturnValue
    public InternerBuilder concurrencyLevel(int concurrencyLevel) {
      this.mapMaker.concurrencyLevel(concurrencyLevel);
      return this;
    }

    public <E> Interner<E> build() {
      if (!strong) {
        mapMaker.weakKeys();
      }

      @Nullable Strength keyStrength,
      @Nullable Strength valueStrength) {

    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
    if (concurrencyLevel != null) {
      builder.concurrencyLevel(concurrencyLevel);
    }
    if (initialCapacity != null) {
      builder.initialCapacity(initialCapacity);
    }
    if (maximumSize != null) {
      builder.maximumSize(maximumSize);
    }

   */
  @CanIgnoreReturnValue
  public CacheBuilder<K, V> concurrencyLevel(int concurrencyLevel) {
    checkState(
        this.concurrencyLevel == UNSET_INT,
        "concurrency level was already set to %s",
        this.concurrencyLevel);
    checkArgument(concurrencyLevel > 0);
    this.concurrencyLevel = concurrencyLevel;
    return this;
  }

  int getConcurrencyLevel() {

    assertThrows(IllegalArgumentException.class, () -> builder.concurrencyLevel(0));
  }

  public void testConcurrencyLevel_setTwice() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder().concurrencyLevel(16);
    assertThrows(IllegalStateException.class, () -> builder.concurrencyLevel(16));
  }

  @J2ktIncompatible
  @GwtIncompatible // CacheTesting

    assertThrows(IllegalArgumentException.class, () -> builder.concurrencyLevel(0));
  }

  public void testConcurrencyLevel_setTwice() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder().concurrencyLevel(16);
    assertThrows(IllegalStateException.class, () -> builder.concurrencyLevel(16));
  }

  @J2ktIncompatible
  @GwtIncompatible // CacheTesting

        Map<Element, Element> map = new MapMaker().concurrencyLevel(1).makeMap();
        for (Element element : keys) {
          map.put(element, element);
        }
        return map;
      }
    },
    MapMaker16 {
      @Override
      Map<Element, Element> create(Collection<Element> keys) {
        Map<Element, Element> map = new MapMaker().concurrencyLevel(16).makeMap();
        for (Element element : keys) {

  @SuppressWarnings("GuardedBy")
  @BeforeExperiment
  void setUp() {
    LocalCache<Object, Object> cache =
        new LocalCache<>(CacheBuilder.newBuilder().concurrencyLevel(1), null);
    segment = cache.segments[0];
    chain = null;
    for (int i = 0; i < length; i++) {
      Object key = new Object();

    concurrencyLevel = min(builder.getConcurrencyLevel(), MAX_SEGMENTS);

    keyEquivalence = builder.getKeyEquivalence();
    this.entryHelper = entryHelper;

    int initialCapacity = min(builder.getInitialCapacity(), MAXIMUM_CAPACITY);

    // Find power-of-two sizes best matching arguments. Constraints:
    // (segmentCount > concurrencyLevel)
    int segmentShift = 0;

    // power of (1/concentration) and floor()ed
    max = Ints.checkedCast((long) Math.pow(distinctKeys, concentration));

    cache =
        CacheBuilder.newBuilder()
            .concurrencyLevel(segments)
            .maximumSize(maximumSize)
            .build(
                new CacheLoader<Integer, Integer>() {
                  @Override
                  public Integer load(Integer from) {

    concurrencyLevel = min(builder.getConcurrencyLevel(), MAX_SEGMENTS);

    keyEquivalence = builder.getKeyEquivalence();
    this.entryHelper = entryHelper;

    int initialCapacity = min(builder.getInitialCapacity(), MAXIMUM_CAPACITY);

    // Find power-of-two sizes best matching arguments. Constraints:
    // (segmentCount > concurrencyLevel)
    int segmentShift = 0;