Increase number of stripes in our keyed locker.

--
MOS_MIGRATED_REVID=100843669

1 files changed, 3 insertions, 2 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/concurrent/RefCountedMultisetKeyedLocker.java b/src/main/java/com/google/devtools/build/lib/concurrent/RefCountedMultisetKeyedLocker.java
index ee1c2b5dbc..52109ad543 100644
--- a/src/main/java/com/google/devtools/build/lib/concurrent/RefCountedMultisetKeyedLocker.java
+++ b/src/main/java/com/google/devtools/build/lib/concurrent/RefCountedMultisetKeyedLocker.java
@@ -31,13 +31,14 @@ public class RefCountedMultisetKeyedLocker<K> implements KeyedLocker<K> {
   // Multiset of keys that have threads waiting on a lock or using a lock.
   private final ConcurrentHashMultiset<K> waiters = ConcurrentHashMultiset.<K>create();
 
-  private static final int NUM_STRIPES = 256;
+  private static final int NUM_STRIPES = 2048;
   // For each key, gives the striped lock to use for atomically managing the waiters on that key
   // internally.
   private final Striped<Lock> waitersLocks = Striped.lazyWeakLock(NUM_STRIPES);
 
   // Map of key to current lock, for keys that have at least one waiting or live thread.
-  private final ConcurrentMap<K, ReentrantLock> locks = new ConcurrentHashMap<>();
+  private final ConcurrentMap<K, ReentrantLock> locks =
+      new ConcurrentHashMap<>(1024, .75f, NUM_STRIPES);
 
   public RefCountedMultisetKeyedLocker() {
   }