[Asterisk-Users] Asterisk CPU priorities (nice?)

[Arve Rasmussen]

Should a "watchdog" be an internal part of the Asterisk core?

The problem is generic. I.e. any real time process may swamp a machine, 
and therefor it is not Asterisk specific.

arve5

 >This is a problem that can be solved in asterisk, though, with a 
watchdog, and/or something more elegant.  I've >implemented this in 
iaxclient (it gets used automatically if you use iaxclient as root on 
linux), and it should be done for >asterisk as well.

 >See http://bugs.digium.com/bug_view_page.php?bug_id=0003203

 >If this is implemented in asterisk, and asterisk swamps your machine 
for more than N seconds (where N is 4, for example), >the real-timedness 
of asterisk goes away..


Arve5

Steve Kann wrote:

> Gilad Ben-Yossef wrote:
>
>> Justin Carlson wrote:
>>
>>> what is wrong with running asterisk with the -pg flags at startup?
>>
>>
>>
>> Which is exactly what I suggested:
>>
>>>>
>>>> Since VoIP is a real time activity, simple "nice" really isn't 
>>>> enough. What you should do is mark the Asterisk proccess as a real 
>>>> time task for the Linux kernel to schedule accordingly. You can do 
>>>> this with Asterisk by passing the "-p" option to the Asterisk 
>>>> command line.
>>>>
>>
>> And the warning still holds:
>>
>>>> A warning is due here: real time priority scheduled tasks are not 
>>>> something to be toyed with. You need to be root to be able to turn 
>>>> on this feature (meaning you have to be running Asterisk as root). 
>>>> A bug in Asterisk, a problem with mpg123 or a red alert on a FXO 
>>>> card can very well leave your system completly non responsive - so 
>>>> use with care.
>>>>
>>>> Having said that, I've been running an Asterisk server on a machine 
>>>> which is also used as SOHO firewall and file server for year now 
>>>> and it works great.
>>>
>>>
> This is a problem that can be solved in asterisk, though, with a 
> watchdog, and/or something more elegant.  I've implemented this in 
> iaxclient (it gets used automatically if you use iaxclient as root on 
> linux), and it should be done for asterisk as well.
>
> See http://bugs.digium.com/bug_view_page.php?bug_id=0003203
>
> If this is implemented in asterisk, and asterisk swamps your machine 
> for more than N seconds (where N is 4, for example), the 
> real-timedness of asterisk goes away..
>
> -SteveK
>
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