Provided by: libredis-fast-perl_0.34+dfsg-1_amd64 
NAME
Redis::Fast - Perl binding for Redis database
SYNOPSIS
## Defaults to $ENV{REDIS_SERVER} or 127.0.0.1:6379
my $redis = Redis::Fast->new;
my $redis = Redis::Fast->new(server => 'redis.example.com:8080');
## Set the connection name (requires Redis 2.6.9)
my $redis = Redis::Fast->new(
server => 'redis.example.com:8080',
name => 'my_connection_name',
);
my $generation = 0;
my $redis = Redis::Fast->new(
server => 'redis.example.com:8080',
name => sub { "cache-$$-".++$generation },
);
## Use UNIX domain socket
my $redis = Redis::Fast->new(sock => '/path/to/socket');
## Enable auto-reconnect
## Try to reconnect every 500ms up to 60 seconds until success
## Die if you can't after that
my $redis = Redis::Fast->new(reconnect => 60, every => 500_000);
## Try each 100ms up to 2 seconds (every is in microseconds)
my $redis = Redis::Fast->new(reconnect => 2, every => 100_000);
## Disable the automatic utf8 encoding => much more performance
## !!!! This will be the default after 2.000, see ENCODING below
my $redis = Redis::Fast->new(encoding => undef);
## Use all the regular Redis commands, they all accept a list of
## arguments
## See http://redis.io/commands for full list
$redis->get('key');
$redis->set('key' => 'value');
$redis->sort('list', 'DESC');
$redis->sort(qw{list LIMIT 0 5 ALPHA DESC});
## Add a coderef argument to run a command in the background
$redis->sort(qw{list LIMIT 0 5 ALPHA DESC}, sub {
my ($reply, $error) = @_;
die "Oops, got an error: $error\n" if defined $error;
print "$_\n" for @$reply;
});
long_computation();
$redis->wait_all_responses;
## or
$redis->wait_one_response();
## Or run a large batch of commands in a pipeline
my %hash = _get_large_batch_of_commands();
$redis->hset('h', $_, $hash{$_}, sub {}) for keys %hash;
$redis->wait_all_responses;
## Publish/Subscribe
$redis->subscribe(
'topic_1',
'topic_2',
sub {
my ($message, $topic, $subscribed_topic) = @_
## $subscribed_topic can be different from topic if
## you use psubscribe() with wildcards
}
);
$redis->psubscribe('nasdaq.*', sub {...});
## Blocks and waits for messages, calls subscribe() callbacks
## ... forever
my $timeout = 10;
$redis->wait_for_messages($timeout) while 1;
## ... until some condition
my $keep_going = 1; ## other code will set to false to quit
$redis->wait_for_messages($timeout) while $keep_going;
$redis->publish('topic_1', 'message');
DESCRIPTION
"Redis::Fast" is a wrapper around Salvatore Sanfilippo's hiredis
<https://github.com/redis/hiredis> C client. It is compatible with Redis.pm
<https://github.com/melo/perl-redis>.
This version supports protocol 2.x (multi-bulk) or later of Redis available at
<https://github.com/antirez/redis/>.
Reconnect on error
Besides auto-reconnect when the connection is closed, "Redis::Fast" supports reconnecting
on the specified errors by the "reconnect_on_error" option. Here's an example that will
reconnect when receiving "READONLY" error:
my $r = Redis::Fast->new(
reconnect => 1, # The value greater than 0 is required
reconnect_on_error => sub {
my ($error, $ret, $command) = @_;
if ($error =~ /READONLY You can't write against a read only slave/) {
# force reconnect
return 1;
}
# do nothing
return -1;
},
);
This feature is useful when using Amazon ElastiCache. Once failover happens, Amazon
ElastiCache will switch the master we currently connected with to a slave, leading to the
following writes fails with the error "READONLY". Using "reconnect_on_error", we can
force the connection to reconnect on this error in order to connect to the new master. If
your Elasticache Redis is enabled to be set an option for close-on-slave-write
<https://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/ParameterGroups.Redis.html#ParameterGroups.Redis.2-8-23>,
this feature might be unnecessary.
The return value of "reconnect_on_error" should be greater than "-2". "-1" means that
"Redis::Fast" behaves the same as without this option. 0 and greater than 0 means that
"Redis::Fast" forces to reconnect and then wait for a next force reconnect until this
value seconds elapse. This unit is a second, and the type is double. For example, 0.01
means 10 milliseconds.
Note: This feature is not supported for the subscribed mode.
PERFORMANCE IN SYNCHRONIZE MODE
Redis.pm
Benchmark: running 00_ping, 10_set, 11_set_r, 20_get, 21_get_r, 30_incr, 30_incr_r, 40_lpush, 50_lpop, 90_h_get, 90_h_set for at least 5 CPU seconds...
00_ping: 8 wallclock secs ( 0.69 usr + 4.77 sys = 5.46 CPU) @ 5538.64/s (n=30241)
10_set: 8 wallclock secs ( 1.07 usr + 4.01 sys = 5.08 CPU) @ 5794.09/s (n=29434)
11_set_r: 7 wallclock secs ( 0.42 usr + 4.84 sys = 5.26 CPU) @ 5051.33/s (n=26570)
20_get: 8 wallclock secs ( 0.69 usr + 4.82 sys = 5.51 CPU) @ 5080.40/s (n=27993)
21_get_r: 7 wallclock secs ( 2.21 usr + 3.09 sys = 5.30 CPU) @ 5389.06/s (n=28562)
30_incr: 7 wallclock secs ( 0.69 usr + 4.73 sys = 5.42 CPU) @ 5671.77/s (n=30741)
30_incr_r: 7 wallclock secs ( 0.85 usr + 4.31 sys = 5.16 CPU) @ 5824.42/s (n=30054)
40_lpush: 8 wallclock secs ( 0.60 usr + 4.77 sys = 5.37 CPU) @ 5832.59/s (n=31321)
50_lpop: 7 wallclock secs ( 1.24 usr + 4.17 sys = 5.41 CPU) @ 5112.75/s (n=27660)
90_h_get: 7 wallclock secs ( 0.63 usr + 4.65 sys = 5.28 CPU) @ 5716.29/s (n=30182)
90_h_set: 7 wallclock secs ( 0.65 usr + 4.74 sys = 5.39 CPU) @ 5593.14/s (n=30147)
Redis::Fast
Redis::Fast is 50% faster than Redis.pm.
Benchmark: running 00_ping, 10_set, 11_set_r, 20_get, 21_get_r, 30_incr, 30_incr_r, 40_lpush, 50_lpop, 90_h_get, 90_h_set for at least 5 CPU seconds...
00_ping: 9 wallclock secs ( 0.18 usr + 4.84 sys = 5.02 CPU) @ 7939.24/s (n=39855)
10_set: 10 wallclock secs ( 0.31 usr + 5.40 sys = 5.71 CPU) @ 7454.64/s (n=42566)
11_set_r: 9 wallclock secs ( 0.31 usr + 4.87 sys = 5.18 CPU) @ 7993.05/s (n=41404)
20_get: 10 wallclock secs ( 0.27 usr + 4.84 sys = 5.11 CPU) @ 8350.68/s (n=42672)
21_get_r: 10 wallclock secs ( 0.32 usr + 5.17 sys = 5.49 CPU) @ 8238.62/s (n=45230)
30_incr: 9 wallclock secs ( 0.23 usr + 5.27 sys = 5.50 CPU) @ 8221.82/s (n=45220)
30_incr_r: 8 wallclock secs ( 0.28 usr + 4.91 sys = 5.19 CPU) @ 8092.29/s (n=41999)
40_lpush: 9 wallclock secs ( 0.18 usr + 5.06 sys = 5.24 CPU) @ 8312.02/s (n=43555)
50_lpop: 9 wallclock secs ( 0.20 usr + 4.84 sys = 5.04 CPU) @ 8010.12/s (n=40371)
90_h_get: 9 wallclock secs ( 0.19 usr + 5.51 sys = 5.70 CPU) @ 7467.72/s (n=42566)
90_h_set: 8 wallclock secs ( 0.28 usr + 4.83 sys = 5.11 CPU) @ 7724.07/s (n=39470)o
PERFORMANCE IN PIPELINE MODE
#!/usr/bin/perl
use warnings;
use strict;
use Time::HiRes qw/time/;
use Redis;
my $count = 100000;
{
my $r = Redis->new;
my $start = time;
for(1..$count) {
$r->set('hoge', 'fuga', sub{});
}
$r->wait_all_responses;
printf "Redis.pm:\n%.2f/s\n", $count / (time - $start);
}
{
my $r = Redis::Fast->new;
my $start = time;
for(1..$count) {
$r->set('hoge', 'fuga', sub{});
}
$r->wait_all_responses;
printf "Redis::Fast:\n%.2f/s\n", $count / (time - $start);
}
Redis::Fast is 4x faster than Redis.pm in pipeline mode.
Redis.pm:
22588.95/s
Redis::Fast:
81098.01/s
AUTHOR
Ichinose Shogo <shogo82148@gmail.com>
SEE ALSO
• Redis.pm <https://github.com/melo/perl-redis>
LICENSE
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.