support for named VM swap file. Fixed a few important interaction issues between the background saving processes and IO threads

1 files changed, 13 insertions, 0 deletions

diff --git a/redis.conf b/redis.conf
index f675ac203..8b8f34a7d 100644
--- a/redis.conf
+++ b/redis.conf
@@ -182,6 +182,19 @@ appendfsync always
 vm-enabled no
 # vm-enabled yes
 
+# This is the path of the Redis swap file. As you can guess, swap files
+# can't be shared by different Redis instances, so make sure to use a swap
+# file for every redis process you are running.
+#
+# The swap file name may contain "%p" that is substituted with the PID of
+# the Redis process, so the default name /tmp/redis-%p.vm will work even
+# with multiple instances as Redis will use, for example, redis-811.vm
+# for one instance and redis-593.vm for another one.
+#
+# Useless to say, the best kind of disk for a Redis swap file (that's accessed
+# at random) is a Solid State Disk (SSD).
+vm-swap-file /tmp/redis-%p.vm
+
 # vm-max-memory configures the VM to use at max the specified amount of
 # RAM. Everything that deos not fit will be swapped on disk *if* possible, that
 # is, if there is still enough contiguous space in the swap file.