Merge pull request #47 from sipa/measure

Improve addrman Select() performance when buckets are nearly empty.
ElementsProject · Aug 26, 2015 · 538c0f6 · 538c0f6
2 parents 8f68447 + 0622350
commit 538c0f6
Showing 1 changed file with 8 additions and 4 deletions.
diff --git a/src/addrman.cpp b/src/addrman.cpp
@@ -343,8 +343,10 @@ CAddress CAddrMan::Select_()
         while (1) {
             int nKBucket = GetRandInt(ADDRMAN_TRIED_BUCKET_COUNT);
             int nKBucketPos = GetRandInt(ADDRMAN_BUCKET_SIZE);
-            if (vvTried[nKBucket][nKBucketPos] == -1)
-                continue;
+            while (vvTried[nKBucket][nKBucketPos] == -1) {
+                nKBucket = (nKBucket + insecure_rand()) % ADDRMAN_TRIED_BUCKET_COUNT;
+                nKBucketPos = (nKBucketPos + insecure_rand()) % ADDRMAN_BUCKET_SIZE;
+            }
             int nId = vvTried[nKBucket][nKBucketPos];
             assert(mapInfo.count(nId) == 1);
             CAddrInfo& info = mapInfo[nId];
@@ -358,8 +360,10 @@ CAddress CAddrMan::Select_()
         while (1) {
             int nUBucket = GetRandInt(ADDRMAN_NEW_BUCKET_COUNT);
             int nUBucketPos = GetRandInt(ADDRMAN_BUCKET_SIZE);
-            if (vvNew[nUBucket][nUBucketPos] == -1)
-                continue;
+            while (vvNew[nUBucket][nUBucketPos] == -1) {
+                nUBucket = (nUBucket + insecure_rand()) % ADDRMAN_NEW_BUCKET_COUNT;
+                nUBucketPos = (nUBucketPos + insecure_rand()) % ADDRMAN_BUCKET_SIZE;
+            }
             int nId = vvNew[nUBucket][nUBucketPos];
             assert(mapInfo.count(nId) == 1);
             CAddrInfo& info = mapInfo[nId];