Re: Finding the Bottleneck
On Thursday 07 June 2001 00:11, Jason Lim wrote:
> 05:51:18 up 5 days, 22:38, 1 user, load average: 6.60, 7.40, 6.51
> 119 processes: 106 sleeping, 11 running, 2 zombie, 0 stopped
> CPU states: 16.4% user, 18.3% system, 0.0% nice, 65.3% idle
> Mem: 128236K total, 124348K used, 3888K free, 72392K buffers
> Swap: 289160K total, 0K used, 289160K free, 9356K cached
> And of "qmail-qstat":
> sh-2.05# qmail-qstat
> messages in queue: 108903
> messages in queue but not yet preprocessed: 19537
> Swap is on Disk 1, because mail queue/spool is on Disk 2.
> I also already added the "-" in front of most entries except the emergency
> or critical ones (if I didn't do it, the load was way higher just writing
> the log files).
> Concerning the mail queue and spool being on the same disk, the reason is
> that there is virtually no emails incoming, 99.999% outgoing.
> About running software raid... I've heard that the CPU usage is increased
> dramatically if you use any form of software raid. Is that true?
> Actually... i doubt the customer would be willing to pay us to implement
> this for him on a hardware level. Good raid cards with good amounts of ram
> don't come cheap last time I checked... :-/
CPU usage isn't increased that much, and as you're only using 30% of the CPU
time it shouldn't be problem if you use more anyway...
Disk access is the main bottleneck, anything that alleviates it is something
you want to do.
http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/ Postal SMTP/POP benchmark
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http://www.coker.com.au/~russell/ My home page