Machine slow

[Martin Hepworth]

Billy

ny old machine was a single 500mhz celeron with 512MB ram and could
handle that load (and MailWatch + db etc)
--
Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300


Billy A. Pumphrey wrote:
> Thanks for the info.  Glad to know that my server (dual 600mhz, 1024
> RAM) is not very taxed at all at processing about 2-3k messages per day.
>
> Billy Pumphrey
> IT Manager
> Wooden & McLaughlin
>
>
>>-----Original Message-----
>>From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
>>Behalf Of Julian Field
>>Sent: Wednesday, May 18, 2005 10:21 AM
>>To: MAILSCANNER at JISCMAIL.AC.UK
>>Subject: Re: Machine slow
>>
>>On 18 May 2005, at 15:48, Steen, Glenn wrote:
>>
>>
>>>Billy A. Pumphrey wrote:
>>>
>>>
>>>>Quick verification on load average if I may.
>>>>
>>>>I do not understand how those numbers work.  They appear not to be
>>>>percent usage.
>>>>
>>>>How do the load average numbers work?
>>>>On my mailwatch, my usually is around .60-1.4
>>>>
>>>>Billy Pumphrey
>>>>IT Manager
>>>>Wooden & McLaughlin
>>>>
>>>>
>>>
>>>(snip)
>>>
>>>The "load factors" are perhaps the most abused "performance
>>>statistics"
>>>around... They're just the CPU run queue size (+ running jobs)
>>>averages
>>>calculated for 1, 5 and 15 minutes. Nice to know and a quick
>>>indicator,
>>>but nothing else.
>>>
>>>For example: on a one CPU system a load of 2 might be less than
>>>desirable,
>>>while on a system with 4 CPUs it shows two CPUs idling away... So
>
> one
>
>>>needs weigh the system as a whole when determining if a certain
>>>load is
>>>fine or not.
>>
>>It's not as simple as that. Jobs can be in the run queue if they are
>>waiting for disk or network response. So if you have 10 processes all
>>waiting to do DNS lookup, for example, then you will have a load
>>greater than 10, but totally idle CPU(s).
>>
>>This is why a busy MailScanner having a load of up to about 15 is
>>nothing to worry about. It merely means there are 15 processes
>>waiting for any of
>>     (a) CPU time
>>     (b) network response
>>     (c) disk i/o.
>>And that is a very simple view of it.
>>
>>When the figure is over 1, it really doesn't tell you very much of
>>any use at all. And all it tells you when it is less than 1 is that
>>there is some time when your system is not doing anything.
>>
>>--
>>Julian Field
>>www.MailScanner.info
>>Buy the MailScanner book at www.MailScanner.info/store
>>PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654
>>
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>
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