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Message from discussion redis-server taking 10 times more RAM to store data than the dump
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Alexey Verkhovsky  
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 More options Jun 1 2009, 11:03 pm
From: Alexey Verkhovsky <alexey.verkhov...@gmail.com>
Date: Mon, 1 Jun 2009 21:03:05 -0600
Local: Mon, Jun 1 2009 11:03 pm
Subject: redis-server taking 10 times more RAM to store data than the dump
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Hi all,

Been playing with Redis quite a bit for the last couple of weeks. One thing
that is bugging me right now looks like this:

02 Jun 02:46:20 . DB 0: 2092395 keys (0 volatile) in 2097152 slots HT.
02 Jun 02:46:20 . 4 clients connected (0 slaves), 310914 bytes in use

This is ~2 mln name-value pairs taking up 300 Mb of RAM (actually, RSS of
that process is even bigger - 440 Mb). The name-value pairs in question map
8-byte strings to integers. And it takes 150-200 bytes of RAM to store each.
The dump of the same database takes up 24 Mb unarchived - 12 bytes per
record, which is a lot more to my liking. I realize that there are indexes
and therefore hash values and pointers everywhere, but 200 bytes pf RAM to
store 16 bytes of data in a big hash table still seems somewhat excessive.

So, is this a normal behavior, and is there a way to cut down the amount of
RAM used by Redis in this scenario by a factor of 2-3?

--
Alexey Verkhovsky
http://alex-verkhovsky.blogspot.com/
CruiseControl.rb [http://cruisecontrolrb.thoughtworks.com]


 
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