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ZNC Memory Usage

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Revision as of 01:37, 18 June 2017 by MetaNova (talk | contribs) (updated data (for old versions) to reflect new column (number of networks))
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This page is intended to give users an idea and rough estimate of how much memory ZNC needs to run. Other users are asked to provide anecdotal reports which include memory usage as well as other relevant information.

Various factors can affect ZNC memory usage, including:

  • Number of channels (across all users on a ZNC instance)
  • Average saved buffer size of each channel
  • Whether the AutoClearChanBuffer setting is used
  • Query Buffers (if ZNC 1.5 or later)
  • Loaded modules (number, type, and function)
  • Number of users
  • System architecture (x86, x86-64, etc.)

Note: These are anecdotal reports, which are personal experiences of other ZNC users/administrators. These reports are not in any way verified, nor are any of them the least bit scientific. If exact resource usage figures are important, performing your own testing is highly recommended. As always, YMMV.

The following list doesn't include a list of modules used in each case for the sake of brevity. However, module use could have a meaningful effect on memory usage.


ZNC Version Memory Usage Number of channels Number of networks Average Buffer Size AutoClearChanBuffer Number of Users System Arch
1.4 60.9 MB About 260 About 2,000 Yes, mostly 9 x86-64 (Debian 7.7)
1.4 27.8 MB About 100 About 100 Yes, mostly 8 x86-64 (Debian 7.7)
1.5 12.1 MB About 20 4 About 850,000 Yes 1 x86-64 (Slackware 14.1)
1.5 7.3 MB About 30 2 About 4,290,032,704 Yes 4 x86-64 (Ubuntu 13.10)
1.6.5 160 MB About 100 5 50 Yes 1 x86-64 (Debian 8)
1.6.5 57 MB About 100 2 50 Yes 2 x86-64 (Debian 8)
1.7.x-git* 324.75 MB Over 200 About 50 - 100 Yes 57 x86-64 (Ubuntu 17.04)
1.7.x-git 50.2 MB 53 2 About 1,000,000 Yes 2 x86-64 (Ubuntu 14.04.5 LTS)
1.7.x-git [ZNC-Linker bot] 7.9 MB 2 1 About 50 Yes 1 x86-64 (Ubuntu 14.04.5 LTS)
1.7.x-git 4.7 MB 9 1 About 500 Yes 1 x86-64 (Ubuntu 14.04.5 LTS)
1.7.x-git 10.3 MB 10 1 About 50 Yes 1 x86-64 (Ubuntu 16.04.2 LTS)
1.7.x-git 7.7 MB 7 1 About 50 Yes 1 x86-64 (Ubuntu 16.04.2 LTS)