Optimize random file access in GetNextFileToPrefetch().

xrootd · Jun 30, 2016 · 44c8f0c · 44c8f0c
1 parent 21a5ee5
commit 44c8f0c
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/XrdFileCache/XrdFileCache.cc b/src/XrdFileCache/XrdFileCache.cc
@@ -254,6 +254,11 @@ Cache::GetNextFileToPrefetch()
    }
 
    //  std::sort(m_files.begin(), m_files.end(), myobject);
+
+   size_t l = m_files.size();
+   int idx = rand() % l;
+   File* f = m_files[idx];
+
    std::random_shuffle(m_files.begin(), m_files.end());
    File* f = m_files.back();
    f->MarkPrefetch();