From 5bd879646cdb303045096fc2b9d75f565313afa8 Mon Sep 17 00:00:00 2001
From: Jason Evans <jasone@canonware.com>
Date: Wed, 15 Jul 2015 17:15:26 -0700
Subject: Change default chunk size from 256 KiB to 2 MiB.
This change improves interaction with transparent huge pages, e.g.
reduced page faults (at least in the absence of unused dirty page
purging).
---
doc/jemalloc.xml.in | 2 +-
include/jemalloc/internal/chunk.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/doc/jemalloc.xml.in b/doc/jemalloc.xml.in
index bb15ae4..eb677ad 100644
--- a/doc/jemalloc.xml.in
+++ b/doc/jemalloc.xml.in
@@ -907,7 +907,7 @@ for (i = 0; i < nbins; i++) {
<listitem><para>Virtual memory chunk size (log base 2). If a chunk
size outside the supported size range is specified, the size is
silently clipped to the minimum/maximum supported size. The default
- chunk size is 256 KiB (2^18).
+ chunk size is 2 MiB (2^21).
</para></listitem>
</varlistentry>
diff --git a/include/jemalloc/internal/chunk.h b/include/jemalloc/internal/chunk.h
index c253cdc..91aefad 100644
--- a/include/jemalloc/internal/chunk.h
+++ b/include/jemalloc/internal/chunk.h
@@ -5,7 +5,7 @@
* Size and alignment of memory chunks that are allocated by the OS's virtual
* memory system.
*/
-#define LG_CHUNK_DEFAULT 18
+#define LG_CHUNK_DEFAULT 21
/* Return the chunk address for allocation address a. */
#define CHUNK_ADDR2BASE(a) \
--
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