From 07d0379edd4c5844d84e66a2c979d3bc651fc4a0 Mon Sep 17 00:00:00 2001
From: David Schwartz <davidjoelschwartz@gmail.com>
Date: Mon, 5 May 2014 09:45:00 -0700
Subject: [PATCH] Reduce number of async fetches

---
 src/ripple_core/nodestore/impl/DatabaseImp.h | 4 +++-
 src/ripple_core/nodestore/impl/Tuning.h      | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/ripple_core/nodestore/impl/DatabaseImp.h b/src/ripple_core/nodestore/impl/DatabaseImp.h
index 92318902f..ebb98a5b7 100644
--- a/src/ripple_core/nodestore/impl/DatabaseImp.h
+++ b/src/ripple_core/nodestore/impl/DatabaseImp.h
@@ -130,7 +130,9 @@ public:
     int getDesiredAsyncReadCount ()
     {
         // We prefer a client not fill our cache
-        return m_cache.getTargetSize() / 4;
+        // We don't want to push data out of the cache
+        // before it's retrieved
+        return m_cache.getTargetSize() / asyncDivider;
     }
 
     NodeObject::Ptr fetch (uint256 const& hash)
diff --git a/src/ripple_core/nodestore/impl/Tuning.h b/src/ripple_core/nodestore/impl/Tuning.h
index c5bb1cb85..dcacf9388 100644
--- a/src/ripple_core/nodestore/impl/Tuning.h
+++ b/src/ripple_core/nodestore/impl/Tuning.h
@@ -30,6 +30,9 @@ enum
 
     // Expiration time for cached nodes
     ,cacheTargetSeconds = 300
+
+    // Fraction of the cache one query source can take
+    ,asyncDivider = 8
 };
 
 }