X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/b0553789719a3f47531655dab13f5def5ce35403..c44d3b56df4ce4cae1c2e6db6397eaab9651ff7a:/redis.conf diff --git a/redis.conf b/redis.conf index c1a1f7f1..c9ff26cf 100644 --- a/redis.conf +++ b/redis.conf @@ -22,9 +22,10 @@ timeout 300 # Set server verbosity to 'debug' # it can be one of: # debug (a lot of information, useful for development/testing) +# verbose (many rarely useful info, but not a mess like the debug level) # notice (moderately verbose, what you want in production probably) # warning (only very important / critical messages are logged) -loglevel debug +loglevel verbose # Specify the log file name. Also 'stdout' can be used to force # the demon to log on the standard output. Note that if you use standard @@ -49,6 +50,9 @@ databases 16 # after 900 sec (15 min) if at least 1 key changed # after 300 sec (5 min) if at least 10 keys changed # after 60 sec if at least 10000 keys changed +# +# Note: you can disable saving at all commenting all the "save" lines. + save 900 1 save 300 10 save 60 10000 @@ -97,7 +101,7 @@ dir ./ # Set the max number of connected clients at the same time. By default there # is no limit, and it's up to the number of file descriptors the Redis process -# is able to open. The special value '0' means no limts. +# is able to open. The special value '0' means no limits. # Once the limit is reached Redis will close all the new connections sending # an error 'max number of clients reached'. # @@ -129,7 +133,7 @@ dir ./ # happens this is the preferred way to run Redis. If instead you care a lot # about your data and don't want to that a single record can get lost you should # enable the append only mode: when this mode is enabled Redis will append -# every write operation received in the file appendonly.log. This file will +# every write operation received in the file appendonly.aof. This file will # be read on startup in order to rebuild the full dataset in memory. # # Note that you can have both the async dumps and the append only file if you @@ -137,7 +141,7 @@ dir ./ # Still if append only mode is enabled Redis will load the data from the # log file at startup ignoring the dump.rdb file. # -# The name of the append only file is "appendonly.log" +# The name of the append only file is "appendonly.aof" # # IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append # log file in background when it gets too big. @@ -154,16 +158,96 @@ appendonly no # always: fsync after every write to the append only log . Slow, Safest. # everysec: fsync only if one second passed since the last fsync. Compromise. # -# The default is "always" that's the safer of the options. It's up to you to -# understand if you can relax this to "everysec" that will fsync every second -# or to "no" that will let the operating system flush the output buffer when -# it want, for better performances (but if you can live with the idea of -# some data loss consider the default persistence mode that's snapshotting). +# The default is "everysec" that's usually the right compromise between +# speed and data safety. It's up to you to understand if you can relax this to +# "no" that will will let the operating system flush the output buffer when +# it wants, for better performances (but if you can live with the idea of +# some data loss consider the default persistence mode that's snapshotting), +# or on the contrary, use "always" that's very slow but a bit safer than +# everysec. +# +# If unsure, use "everysec". -appendfsync always -# appendfsync everysec +# appendfsync always +appendfsync everysec # appendfsync no +################################ VIRTUAL MEMORY ############################### + +# Virtual Memory allows Redis to work with datasets bigger than the actual +# amount of RAM needed to hold the whole dataset in memory. +# In order to do so very used keys are taken in memory while the other keys +# are swapped into a swap file, similarly to what operating systems do +# with memory pages. +# +# To enable VM just set 'vm-enabled' to yes, and set the following three +# VM parameters accordingly to your needs. + +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). +# +# *** WARNING *** if you are using a shared hosting the default of putting +# the swap file under /tmp is not secure. Create a dir with access granted +# only to Redis user and configure Redis to create the swap file there. +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. +# +# With vm-max-memory 0 the system will swap everything it can. Not a good +# default, just specify the max amount of RAM you can in bytes, but it's +# better to leave some margin. For instance specify an amount of RAM +# that's more or less between 60 and 80% of your free RAM. +vm-max-memory 0 + +# Redis swap files is split into pages. An object can be saved using multiple +# contiguous pages, but pages can't be shared between different objects. +# So if your page is too big, small objects swapped out on disk will waste +# a lot of space. If you page is too small, there is less space in the swap +# file (assuming you configured the same number of total swap file pages). +# +# If you use a lot of small objects, use a page size of 64 or 32 bytes. +# If you use a lot of big objects, use a bigger page size. +# If unsure, use the default :) +vm-page-size 32 + +# Number of total memory pages in the swap file. +# Given that the page table (a bitmap of free/used pages) is taken in memory, +# every 8 pages on disk will consume 1 byte of RAM. +# +# The total swap size is vm-page-size * vm-pages +# +# With the default of 32-bytes memory pages and 134217728 pages Redis will +# use a 4 GB swap file, that will use 16 MB of RAM for the page table. +# +# It's better to use the smallest acceptable value for your application, +# but the default is large in order to work in most conditions. +vm-pages 134217728 + +# Max number of VM I/O threads running at the same time. +# This threads are used to read/write data from/to swap file, since they +# also encode and decode objects from disk to memory or the reverse, a bigger +# number of threads can help with big objects even if they can't help with +# I/O itself as the physical device may not be able to couple with many +# reads/writes operations at the same time. +# +# The special value of 0 turn off threaded I/O and enables the blocking +# Virtual Memory implementation. +vm-max-threads 4 + ############################### ADVANCED CONFIG ############################### # Glue small output buffers together in order to send small replies in a @@ -171,19 +255,39 @@ appendfsync always # in terms of number of queries per second. Use 'yes' if unsure. glueoutputbuf yes -# Use object sharing. Can save a lot of memory if you have many common -# string in your dataset, but performs lookups against the shared objects -# pool so it uses more CPU and can be a bit slower. Usually it's a good -# idea. -# -# When object sharing is enabled (shareobjects yes) you can use -# shareobjectspoolsize to control the size of the pool used in order to try -# object sharing. A bigger pool size will lead to better sharing capabilities. -# In general you want this value to be at least the double of the number of -# very common strings you have in your dataset. -# -# WARNING: object sharing is experimental, don't enable this feature -# in production before of Redis 1.0-stable. Still please try this feature in -# your development environment so that we can test it better. -shareobjects no -shareobjectspoolsize 1024 +# Hashes are encoded in a special way (much more memory efficient) when they +# have at max a given numer of elements, and the biggest element does not +# exceed a given threshold. You can configure this limits with the following +# configuration directives. +hash-max-zipmap-entries 64 +hash-max-zipmap-value 512 + +# Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in +# order to help rehashing the main Redis hash table (the one mapping top-level +# keys to values). The hash table implementation redis uses (see dict.c) +# performs a lazy rehashing: the more operation you run into an hash table +# that is rhashing, the more rehashing "steps" are performed, so if the +# server is idle the rehashing is never complete and some more memory is used +# by the hash table. +# +# The default is to use this millisecond 10 times every second in order to +# active rehashing the main dictionaries, freeing memory when possible. +# +# If unsure: +# use "activerehashing no" if you have hard latency requirements and it is +# not a good thing in your environment that Redis can reply form time to time +# to queries with 2 milliseconds delay. +# +# use "activerehashing yes" if you don't have such hard requirements but +# want to free memory asap when possible. +activerehashing yes + +################################## INCLUDES ################################### + +# Include one or more other config files here. This is useful if you +# have a standard template that goes to all redis server but also need +# to customize a few per-server settings. Include files can include +# other files, so use this wisely. +# +# include /path/to/local.conf +# include /path/to/other.conf