[PATCH] read-cache: increase write buffer size

[David Turner <dturner@twopensource.com>]

Each write() has syscall overhead, and writing a large index entails
many such calls.  A larger write buffer reduces the overhead,
leading to increased performance.

On my repo, which has an index size of 30m, this saves about 10ms of
time writing the index.

Signed-off-by: David Turner <dturner@twopensource.com>
---
 read-cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/read-cache.c b/read-cache.c
index d9fb78b..09ebe08 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1714,7 +1714,7 @@ int unmerged_index(const struct index_state *istate)
 	return 0;
 }
 
-#define WRITE_BUFFER_SIZE 8192
+#define WRITE_BUFFER_SIZE 131072
 static unsigned char write_buffer[WRITE_BUFFER_SIZE];
 static unsigned long write_buffer_len;
 
-- 
2.4.2.767.g62658d5-twtrsrc