//    definitely observe all earlier writes, but we still have no guarantee that done() would see
  //    the initial write (just stronger guarantees if it does).
  //
  // See: http://cs.oswego.edu/pipermail/concurrency-interest/2015-January/013800.html
  // For a (long) discussion about this specific issue and the general futility of life.
  //
  // For the time being we are OK with the problem discussed above since it requires a caller to

  public void testSizingDefaults() {
    LoadingCache<?, ?> cache = CacheBuilder.newBuilder().build(identityLoader());
    LocalCache<?, ?> map = CacheTesting.toLocalCache(cache);
    assertThat(map.segments).hasLength(4); // concurrency level
    assertEquals(4, map.segments[0].table.length()); // capacity / conc level
  }

  @GwtIncompatible // CountDownLatch
  static final class DelayingIdentityLoader<T> extends CacheLoader<T, T> {

  public void testSizingDefaults() {
    LoadingCache<?, ?> cache = CacheBuilder.newBuilder().build(identityLoader());
    LocalCache<?, ?> map = CacheTesting.toLocalCache(cache);
    assertThat(map.segments).hasLength(4); // concurrency level
    assertEquals(4, map.segments[0].table.length()); // capacity / conc level
  }

  @GwtIncompatible // CountDownLatch
  static final class DelayingIdentityLoader<T> extends CacheLoader<T, T> {

}

var listCache sync.Map // map[string]listImports, keyed by contextName

// listSem is a semaphore restricting concurrent invocations of 'go list'. 'go
// list' has its own internal concurrency, so we use a hard-coded constant (to
// allow the I/O-intensive phases of 'go list' to overlap) instead of scaling
// all the way up to GOMAXPROCS.
var listSem = make(chan semToken, 2)

type semToken struct{}

   *
   * <p>We manage calls to this method carefully, to signal only when necessary, but never losing a
   * signal, which is the classic problem of this kind of concurrency construct. We must signal if
   * the current thread is about to relinquish the lock and may have changed the state protected by
   * the monitor, thereby causing some guard to be satisfied.
   *

    assertSame(DISCARDING_QUEUE, map.removalNotificationQueue);
    assertSame(NULL_TICKER, map.ticker);

    assertEquals(4, map.concurrencyLevel);

    // concurrency level
    assertThat(map.segments).hasLength(4);
    // initial capacity / concurrency level
    assertEquals(16 / map.segments.length, map.segments[0].table.length());

    assertFalse(map.evictsBySize());
    assertFalse(map.expires());

}

// ObjectSpeedTestHandler - reports maximum speed of a cluster by performing PUT and
// GET operations on the server, supports auto tuning by default by automatically
// increasing concurrency and stopping when we have reached the limits on the
// system.
func (a adminAPIHandlers) ObjectSpeedTestHandler(w http.ResponseWriter, r *http.Request) {
	ctx, cancel := context.WithCancel(r.Context())
	defer cancel()

    misconfigured `ExecutorService` that limited the number of worker threads.
    If you're using `Call.enqueue()` this update should significantly improve
    request concurrency.

 *  **Fix: Lazily initialize the response cache.** This avoids strict mode
    warnings when initializing OkHttp on Android‘s main thread.

 *  **Fix: Disable ALPN on Android 4.4.** That release of the feature was

                    }
                }
                assertTrue(hasNonZero, "Each array should have a signature");
            }
        }

        @Test
        @DisplayName("Should handle high concurrency without deadlock")
        void testHighConcurrencyNoDeadlock() throws InterruptedException {
            int threadCount = 100;
            int operationsPerThread = 50;

	values := make(url.Values)
	values.Set(peerRESTSize, strconv.Itoa(opts.objectSize))
	values.Set(peerRESTConcurrent, strconv.Itoa(opts.concurrency))
	values.Set(peerRESTDuration, opts.duration.String())
	values.Set(peerRESTStorageClass, opts.storageClass)
	values.Set(peerRESTBucket, opts.bucketName)