[cfaussie] Re: throughput and simultaneous requests
Basically I am on a witchhunt trying to see why some pages are occasionally too slow. Geoff, Your example is exactly what I am trying to do. (In other words, should I touch the CF default settings?) Lucus, in the Performance Monitor there is a chart of simultaneous requests (but I dont know how to log it. The number of simultaneous requests at any one time seems to always be an even number between 0 and eight) For throughput should I go with a ratio? number of pages served per second / mb served per sec How do I log the number of simultaneous requests? Can you define what you are trying to measure? Both of these definitions will change with respect to the task at hand, and have little meaning without factoring in some concept of time. For example, are you trying to determine optimal configuration settings, number of users that can be served in a certain time interval with a given response time, and so on. Best regards, -- geoff http://www.daemon.com.au/ Date: Fri, 5 Sep 2008 14:28:22 +1000 From: [EMAIL PROTECTED] To: cfaussie@googlegroups.com Subject: [cfaussie] Re: throughput and simultaneous requests Hi Mark, throughput can be measured in two ways (that i know of) 1. number of pages served per second 2. mb served per sec and simultaneous requests would be the amount of requests in a single second hope this helps, Lucas. On Fri, Sep 5, 2008 at 1:09 PM, Mark Ireland [EMAIL PROTECTED] wrote: I want to chart throughput against simultaneous requests. Can someone please give me a definitions for throughput and simultaneous requests. Thanks Play now to win prizes for you and your friends! Are you a friend magnet? -- Lucas http://www.thebitbucket.net/ _ It's simple! Sell your car for just $40 at CarPoint.com.au http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fsecure%2Dau%2Eimrworldwide%2Ecom%2Fcgi%2Dbin%2Fa%2Fci%5F450304%2Fet%5F2%2Fcg%5F801459%2Fpi%5F1004813%2Fai%5F859641_t=762955845_r=tig_OCT07_m=EXT --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups cfaussie group. To post to this group, send email to cfaussie@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/cfaussie?hl=en -~--~~~~--~~--~--~---
[cfaussie] Re: throughput and simultaneous requests
Hi Mark, you wrote: Basically I am on a witchhunt trying to see why some pages are occasionally too slow. Geoff, Your example is exactly what I am trying to do. (In other words, should I touch the CF default settings?) Lucus, in the Performance Monitor there is a chart of simultaneous requests (but I dont know how to log it. The number of simultaneous requests at any one time seems to always be an even number between 0 and eight) If you can tickle the code add the GetMetricData(PERF_MONITOR) function to Application.cfm/c or put it in OnRequestEnd, or both is even better if you can, and grab some of the parameters shown there. You can see how many requests are running at that moment, etc., it has some useful numbers. Store the bits you want incrementally into a application scope struct with a timestamp or some such and dump that to see what is going on. You can also add a getTickCount() to both ends of the page and see how long the page took to process, it amazes me how ofter a slow page has nothing to do with CF but is dependent on the connection (FireBug comes in handy there) Assuming x86-based CPUs and unless you have an old server they have HyperThreaded cores and the OS thinks there are two CPUs where there is actually one with its two internal bits. So the Simultaneous requests number is always an even number as CF farms out threads per CPU. If you have a typical dual-dual Xeon box you have 2 Dual Core HyperThreaded CPUs, really 4 processing cores but the OS will report 8 CPUs. With the processing speed available now the old rule-of-thumb of 5 threads(simultaneous requests) per CPU is long gone 10 or more is OK (assuming good SAS/SCSI drives, lots of RAM, etc). With Simultaneous Requests meaning the number of pages CF is processing at any one moment as soon as the number of requests rise above the number of CPUs there is internal thread switching going on in CF as well as the overall OS task switching so other performance issues creep in. We found on one client's site that it used to suddenly bog for no apparent reason and it was traced to folk doing file uploads into the management system of the site (a glorified CMS thingo). When there is a file upload going on one CPU core gets dedicated to that task and become unavailable to the task switching pool so there could be a performance hit. Its only half an answer but I hope it helps. (IOHAABIHIH, is that a new acronym? I don't think so :-)) -- Yours, Kym Kovan mbcomms.net.au --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups cfaussie group. To post to this group, send email to cfaussie@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/cfaussie?hl=en -~--~~~~--~~--~--~---
[cfaussie] Re: throughput and simultaneous requests
On Sep 5, 1:09 pm, Mark Ireland [EMAIL PROTECTED] wrote: I want to chart throughput against simultaneous requests. Can someone please give me a definitions for throughput and simultaneous requests. Can you define what you are trying to measure? Both of these definitions will change with respect to the task at hand, and have little meaning without factoring in some concept of time. For example, are you trying to determine optimal configuration settings, number of users that can be served in a certain time interval with a given response time, and so on. Best regards, -- geoff http://www.daemon.com.au/ --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups cfaussie group. To post to this group, send email to cfaussie@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/cfaussie?hl=en -~--~~~~--~~--~--~---
[cfaussie] Re: throughput and simultaneous requests
Hi Mark, throughput can be measured in two ways (that i know of) 1. number of pages served per second 2. mb served per sec and simultaneous requests would be the amount of requests in a single second hope this helps, Lucas. On Fri, Sep 5, 2008 at 1:09 PM, Mark Ireland [EMAIL PROTECTED] wrote: I want to chart throughput against simultaneous requests. Can someone please give me a definitions for throughput and simultaneous requests. Thanks Play now to win prizes for you and your friends! Are you a friend magnet? -- Lucas http://www.thebitbucket.net/ --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups cfaussie group. To post to this group, send email to cfaussie@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/cfaussie?hl=en -~--~~~~--~~--~--~---
