Common values for MaxServers/MinSpareServers/MinSpareServers/MinSpareServers

[Chimezie Ogbuji]

I'm having issues with the akara processes shutting down after some
time. I want to rule out whether my MaxMin/etc server configuration
settings are to blame and was wondering if others who use akara on
production servers can share their settings for these values?

This is what I have

MaxServers = 3
MinSpareServers = 1
MinSpareServers = 2
MinSpareServers = 1000

The message in the log I see that leads me to think these settings
have something to do with it is:

May 17 20:26:31 akara[29276]: [INFO] Akara server shutting down.
May 17 20:26:31 akara[29276]: [INFO] Removed PID file '..etc..'

Which I only expect to see when I explicitly bring the server down

Thanks

-- Chime

[Luis Miguel Morillas]

2013/5/17 Chimezie Ogbuji <chim...@gmail.com>:

> I'm having issues with the akara processes shutting down after some
> time. I want to rule out whether my MaxMin/etc server configuration
> settings are to blame and was wondering if others who use akara on
> production servers can share their settings for these values?
>
> This is what I have
>
> MaxServers = 3
> MinSpareServers = 1
> MinSpareServers = 2
> MinSpareServers = 1000

Is this what you have?

MaxServers = 3
MinSpareServers = 1

MaxSpareServers = 2
MaxRequestsPerServer = 1000

luismiguel

>
> The message in the log I see that leads me to think these settings
> have something to do with it is:
>
> May 17 20:26:31 akara[29276]: [INFO] Akara server shutting down.
> May 17 20:26:31 akara[29276]: [INFO] Removed PID file '..etc..'
>
> Which I only expect to see when I explicitly bring the server down
>
> Thanks
>
> -- Chime
>

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[Uche Ogbuji]

Hi Chimezie,

Wow those are really cranked down settings!  Here is what we use in production:

grep Servers akara.conf

    #  MaxServers: maximum number of servers to run at any one time

    MaxServers           = 150

    #  MinSpareServers: minimum number of spare servers

    MinSpareServers      =   5

    #  MaxSpareServers: maximum number of spare servers

    MaxSpareServers      =  10

Which I think matches the distributed defaults,

Yes, at MaxServers = 3 I can expect a lot of reaping and respawning, which might cause some thrashing behavior.

Another very important setting is:

    #  MaxRequestsPerServer: restart a server after this many requests

    MaxRequestsPerServer =   10

This is usually the first one to tweak for perf.  If you use a lot of lightweight processes, crank it up (100 - 300, perhaps).  If you use a more modest number of heavyweight processes, keep it low (10 - 30, perhaps).

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