Ummmm... yeah, I'll make a few comments on that. The general rule for setting simultaneous requests is for 5 per processor. The fact that he has set his to 50 and things appear fine to him I guess is a good thing - unless he's not seeing the whole picture.
If his has such high traffic volume that the regularly and consistently gets timeouts then I think that means that he need to increase the amount of hardware or reduce the number of websites running on the machine. Increasing the number of simultaneous users may very well decrease the number of timeouts that occur due to a shorter queue, but it may be increasing the wait time for a template to be processed to unbearable figures. It could be driving some customers away rather than servicing them. Also, what is the figure that you've set in your administrator for timeouts? Is it set unusually high? That could be another reason that timeouts are decreasing in this case. The Holy Grail of web server tuning is to have maximum throughput measured in the amount of information leaving the server in the shortest amount of time. I'm not saying that it isn't possible that he's getting great results with his settings. I'm just trying to repeat some of the things that I learned about server tuning. I'm not expert on this either, so something I've written could be wrong. - Matt Small -----Original Message----- From: John Innit [mailto:[EMAIL PROTECTED]] Sent: Tuesday, April 23, 2002 9:41 AM To: CF-Talk Subject: Re: Optimal settings for LIMIT SIMULTANEOUS REQUESTS Bud, thanks for your response. So you've set your simultaneous requests limit to 50 !!!! and your performance is fine and you've minimized your time outs, that's interesting. Anyone have any comments on that ?? At 08:34 PM 4/23/2002, you wrote: >On 4/23/02, John Innit penned: > >Our web server is a P3 500 with 512KB RAM running WIN2K/ IIS & CF 4.5.1 > >our DB server is also a P3 500 with 512KB RAM running WIN2K and SQL > >SERVER 2000 > >I've read the rule of thumb for the limit simultaneous requests should be > >2x or 3x the number of processors on the box, as we have 1 processor on our > >web server does this mean our setting should be only 2 simultaneous > >requests??? This seems frighteningly low to me!! currently we have it set > >to 15. - am I missing something here ? > >Well, when I had mine set to the recommended settings I used to get >dozens of timeouts daily in the application.log. Every couple days >I'd go in and raise it by 5 and the number of timeouts would >decrease. When I got to 45 they went away. I then made it 50 and >never get timeouts and the performance hasn't suffered. Right now I'm >hosting about 40 CF sites on the box, with about half running Access >as the database and the other half running SQL on a separate box. >Some of the SQL sites are pretty busy getting hundreds of visitors >daily with one doing close to 2,000 visitors daily. I do get some >ConnectWrite SQL Server ODBC timeout errors, an average of about 4 a >day, which I can live with. > >My web server is running dual 533 Mz PIIIs with 1 GB RAM. The SQL >Server is a single PIII 833 Mz with 512 MB RAM. >-- > >Bud Schneehagen - Tropical Web Creations > >_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ >ColdFusion Solutions / eCommerce Development >[EMAIL PROTECTED] >http://www.twcreations.com/ >954.721.3452 > ______________________________________________________________________ This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting. FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/[email protected]/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
