Re: Finding the Bottleneck
- To: "Jason Lim" <email@example.com>, <firstname.lastname@example.org>
- Subject: Re: Finding the Bottleneck
- From: Russell Coker <email@example.com>
- Date: Thu, 7 Jun 2001 09:21:05 +0200
- Message-id: <0106070921050G.13317@lyta>
- Reply-to: Russell Coker <firstname.lastname@example.org>
- In-reply-to: <00dd01c0eed6$fe1d02a0$0300a8c0@jcl1>
- References: <00e001c0ee3c$5ac9d8c0$0300a8c0@jcl1> <01060614055109.09428@lyta> <00dd01c0eed6$fe1d02a0$0300a8c0@jcl1>
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
http://www.coker.com.au/projects.html Projects I am working on
http://www.coker.com.au/~russell/ My home page