From 88f777f332022ad2b92be5ceccf1863e9fb4d53f Mon Sep 17 00:00:00 2001
From: Ben Johnson <benbjohnson@yahoo.com>
Date: Tue, 2 Jun 2015 13:04:44 -0600
Subject: [PATCH] Add madvise() after mmap().

This commit advises the mmapped data file to use MADV_RANDOM to avoid
readahead. This can provide a performance boost to Bolt databases that
are larger than memory by avoiding unnecessary disk i/o.
---
 bolt_unix.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/bolt_unix.go b/bolt_unix.go
index 266222a..17ca318 100644
--- a/bolt_unix.go
+++ b/bolt_unix.go
@@ -63,6 +63,11 @@ func mmap(db *DB, sz int) error {
 		return err
 	}
 
+	// Advise the kernel that the mmap is accessed randomly.
+	if err := madvise(b, syscall.MADV_RANDOM); err != nil {
+		return fmt.Errorf("madvise: %s", err)
+	}
+
 	// Save the original byte slice and convert to a byte array pointer.
 	db.dataref = b
 	db.data = (*[maxMapSize]byte)(unsafe.Pointer(&b[0]))
@@ -84,3 +89,12 @@ func munmap(db *DB) error {
 	db.datasz = 0
 	return err
 }
+
+// NOTE: This function is copied from stdlib because it is not available on darwin.
+func madvise(b []byte, advice int) (err error) {
+	_, _, e1 := syscall.Syscall(syscall.SYS_MADVISE, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), uintptr(advice))
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}