Ejabberd Kernel Poll - Geeks of Knowhere

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Over the past week, some of our users have reported that they have stumbled upon an overview of the ejabberd core.

Support Found In Erlang / OTP

FreeBSD (kqueue)
Linux 2.4 (/ dev / kpoll)
Linux 2.6 (/ dev / epoll)
Solaris (/ dev / poll)

How To Enable Kernel Polling On Erlang / OTP Nodes

ejabberd kernel poll

When starting an Erlang node, kernel polling is disabled by default:

 $ extErlang R13B04 (erts-5.7.5) [source] [smp: 2: 2] [rq: 2] [async threads: 0] [kernel poll: false]Eshell V5.7.5 (discontinued with ^ G)1> q ().Good

ejabberd kernel poll

To run an Erlang node with kernel checking support, you need to specify the following argument:

$ erl + K trueErlang R13B04 (erts-5.7.5) [source] [smp: 2: 2] [rq: 2] [async threads: 0] [kernel poll: true]Eshell V5.7.5 (discontinued with ^ G)1> q ().Good

If Erlang doesn’t protect your poll or your system’s kernel, it will report an error.

How To Enable Ejabberd Core Polling

ejabberd on starts Erlang with kernel probing enabled by default: the ejabberdctl script starts the Erlang node with the above argument. You will be sure to disable it by editing the ejabberdctl.cfg directory and putting this line:

POLL = false

To see if the configuration is working as expected, you can run ejabberd in direct mode. This will show at the beginning.No, whether a core probe is in use or not. This is the result of the most important standard configuration:

$ ejabberdctl live————————————————– ——————IMPORTANT: ejabberd runs in LIVE (interactive) mode.All log messages are generated in the command shell.You can interact with the entire ejabberd node if you know how to use it.Please be extremely careful with your actions,and is immediately contaminated if not indicated completely.To exit this LIVE and ejabberd mode, do not press: Q (). and press that Enter key————————————————– ——————To work around this warning once and for all, add the appropriate line to ejabberdctl.cfg: EJABBERD_BYPASS_WARNINGS = truePress any key with NextErlang R13B04 (erts-5.7.5) [source] [smp: 2: 2] [rq: 2] [async threads: 0] [kernel poll: true]Eshell V5.7.5 with (Drop ^ G)(ejabberd @ localhost) 1>= PROGRESS REPORT ==== 15-Mar-2010 :: 20:44:15 === Supervisor: local, sasl_safe_sup started: [pid, <0.52. 0>, name, alarm_handler, mfa, alarm_handler, start_link, [], Restart_type, permanent, Decision, 2000, child_type, worker]…

How Manywhat Is Needed For Flawless Work?

Kernel Poll reduces the load on ejabberd’s CPU when it has hundreds (or more) of Internet connections.
It doesn’t affect memory usage or possibly latency. Therefore, if you plan to support a large number of users logged in at the same time, you will definitely need a Jabber server with kernel polling support.

An experiment was conducted to compare the performance of ejabberd with and without kernel polling support.
The tools, environment, process, and benefits are available on the Benchmark, Test 3 page.

The following screenshot was taken during an experiment. It shows Ejabberd debug timeout, Jabsimul window and above. 5000 users simultaneously chat and change the schedule. After 47 minutes of constant load, the Ejabberd (ray) system process requires 5% CPU usage and almost 400MB of RAM.

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