First let me say that there is no generic optimal setting, each CF server should be configured for the application(s) running on it.
With that being said, a sim setting of 512 is probably a little too high. But to truely test this you will need to measure the # of hits and the amount of kb throughput under load over a set period of time. A load tester is the best way to determine this but not the only way. The important part about measuring this information is that the work and the measurement time remain the same for all tests. In other words, you need a script that traverses your site as users would to make it repeatable. In addition, you should watch the request queues with CFSTAT (cfusionmx/bin). i.e. cfusionmx/bin/cfstat 2 (will show the cf statistics every two seconds) You should adjust the sim setting up and down until you see consistent trends, then narrow in on the optimal setting. One other thing to note, there are many more settings that should be investigated before you start. i.e. datasource settings, caching, etc... HTH Regards, Rob Rusher --- Adam Bailin <[EMAIL PROTECTED]> wrote: > Is there a optimal setting for no. of simultaneous requests? > > Our ISP upped ours to 512 when we were having problems with the site. Is this > too much? > > We are running CF5 on Redhat 7.3 and MySQL on a separate database server. > Both machines are dual processor 1GHz with 2GB RAM. We get about 250,000 hits > per day. > > I heard that 4 x (no. of processors) was a good ball-park. > > Adam Bailin > Web Developer > Ofsted > Tel: 020 7421 5977 > > >>> Steven Erat <[EMAIL PROTECTED]> 02/24/03 10:02pm >>> > Diagnosing hangs on CF5 & 4,5x: > > Start by logging "slow pages" as seen on the CFAdmin Logging page. Set it to > a value of perhaps 30 seconds. Then periodically check the server.log under > cf_root/logs/, and look for an entry that ends with ".... Ran: xxx seconds". > Just search for the string "Ran:". Keep a list of those pages with their > reported run times. > > Make sure that the overall server timeout is set reasonably low in the > CFAdmin settings page. Enable 'Restart at X Unresponsive Requests' and set X > to a value less than the 'Simultaneous Requests' value. This will log > problem page requests as "unresponsive" in server.log. Those pages marked > as unresponsive are those that were making a third party call for a period > greater than their timeout setting. > > Keep in mind that some pages in the app might have overriding timeouts with > links that include a querystring in the URL for ?requesttimeout=xxx. They > override the server timeout in the CFAdmin. > > Once you have a list of pages from the server.log marked as slow (search > string is "Ran:") or long running (search string is "unresponsive"), then you > should start troubleshooting the pages that run the longest and work down. > Use caching techniques (cachedwithin on queries, cfcache tag for whole pages) > where ever possible. Look for other performance improvements... don't do > Select * from Table where unwanted data is being selected. Check the trusted > cache setting in the CFAdmin, etc... > > The setting for Restart after X Unresponsive Requests is a heuristic one. CF > will track pages that are unresponsive if the general Timeout is enabled, and > then it will restart itself if that the Restart threshold is reached. This > will kill the hung threads and allow more incoming requests. > > Use cfstat to see what CF is doing. In a hang you would see Reqs Running > equal to Simultaneous Requests, and you should would see Req's Q'd > increasing. This will confirm the information gained from the server.log. > > You should find a lot of performance tuning articles and discussions on the > web for CF5, if you want more info. > > > -----Original Message----- > From: Ian Hartten [mailto:[EMAIL PROTECTED] > Sent: Monday, February 24, 2003 4:43 PM > To: CF-Linux > Subject: Cold Fusion does not like Linux? Anyone? > > Hello, > > First post here for me in a long time....We are looking for advice on issues > related to running CF, Linux and mySQL (and program in fusbox). > > We have a dedicated Linux box (big compac machine with Dual 1 gig > processors).. We are seeing some issues with CF 5 under load... The machine > seems to puke while underloads that I would no consider extremely high.. It > pushes about a gig a day and has even traffic from morning until late > evening... > > We are running red hat, mysql and CF 5 and see that the machine will just > hang under medium load at times for up to 15 minutes and will just come back > suddenly. The CPU pops up to 99% pretty fast. > > Here are my questions: > > Is there a tool that will help us monitor what is actuall happening with CF > processes in detail? > We are looking for suggestions for expanding load balancing - Should we beef > up the processors or add a machine? > Is there a "application level issue" with the CF for Linux that Macromedia > is not fully admitting too? > > > Thanks, > > Ian Hartten > Toledo, Ohio > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=14 Subscription: http://www.houseoffusion.com/cf_lists/index.cfm?method=subscribe&forumid=14 Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.14
