more conservative preallocateIsFaster check

1 files changed, 7 insertions, 1 deletions

diff --git a/db/dur_journal.cpp b/db/dur_journal.cpp
index a3a2a493192..cfed2191f75 100644
--- a/db/dur_journal.cpp
+++ b/db/dur_journal.cpp
@@ -240,7 +240,13 @@ namespace mongo {
         }
         bool preallocateIsFaster() {
             Timer t;
-            bool res = _preallocateIsFaster() && _preallocateIsFaster() && _preallocateIsFaster(); 
+            bool res = false;
+            if( _preallocateIsFaster() && _preallocateIsFaster() ) { 
+                // maybe system is just super busy at the moment? sleep a second to let it calm down.  
+                // deciding to to prealloc is a medium big decision:
+                sleepsecs(1);
+                res = _preallocateIsFaster();
+            }
             if( t.millis() > 3000 ) 
                 log() << "preallocateIsFaster check took " << t.millis()/1000.0 << " secs" << endl;
             return res;