Thanks all for your replies. It gives me much to ponder about. Abel.
Andrey Beznogov wrote: > > Hello, > > there are some very nice (and short too ;)) publications on that > topic. You could start by reading "Part 4: Modeling Groups of Users" > of the "User Experience, not Metrics" Series. > > PDF file of that article http://www.perftestplus.com/resources/UENM4.pdf > Home page of the series (scroll down, its somewhere in the second half > of the page) http://www.perftestplus.com/pubs.htm > JMeter Wiki with some interesting links > http://wiki.apache.org/jakarta-jmeter/ > > Long story short, your server does not care much about the number of > concurrent users, it is just receiving the requests, processing them > and sending out the response. So basically, what you are emulating is > number of different HTTP Sampler calls per second. With JMeter, you > could run those Samplers more frequently, i.e. simulate more users > with less threads. That is, if you configure everything right. And if > you loop those threads, you don't have to spawn a new one for every > new run through the user model. > > Regards, > Andrey > > If you loop some threads which are sending out the requests much > faster than real users, and if you configure those threads right, the > generated load will be the same as the one generated by more you could > generate the same load as many of those real users with some large > thinking time do. > On Thu, Jul 10, 2008 at 10:44 AM, Abel MacAdam <[EMAIL PROTECTED]> > wrote: >> >> Peter and Sebb, >> >> Thanks for your reply. >> >> How would you emulate: >> "During peak hours we get a maximum of 3600 requests per hour." >> and >> "Each step in the sales process may cost a maximum of 1 second" >> >> I think the second request is not possible to emulate, as it depends on >> the >> webserver and traffic on the Internet, not on JMeter. >> >> The transaction I need to test consists of 6 pages. Different pages where >> you need to fill in personal data. Compare it with entering your personal >> data >> when you buy something at Amazon. >> >> Should I add "think" time at each page, so the "user" I emulate has the >> time to enter information? 10 Seconds per page where you need to enter >> something? That makes a transaction time of 20 seconds (two pages where >> data needs to be entered). >> >> 1 Does that make 6 requests in 20 seconds? >> 2 Should I multiply that with 600, to get 3600 requests? >> or >> 3a Should I multiply that with 180 to get 3600 seconds? (eg repeat 180 >> times) >> and >> 3b Should I use 4 users (3,333) to get from 180 to 600 requests? >> >> Eventually I used 25 threads with a ramp up of 25 seconds, to be repeated >> indefinitely. I observed that the server had problems (response code 502) >> responding to the load. >> >> Abel >> >> >> sebb-2-2 wrote: >>> >>> On 09/07/2008, Abel MacAdam <[EMAIL PROTECTED]> wrote: >>>> >>>> Hi, >>>> >>>> Today I tried to emulate "3600 users in one hour" by making a test >>>> where >>>> 3600 threads where started in 3600 seconds. I observed that the load >>>> in >>>> one >>>> of my CPU's went to 100 %, and that JMeter stopped responding. >>>> Eventually I >>>> killed this process, and restarted it with 25 threads, to be started >>>> within >>>> 25 seconds, and looping forever, but now for 3600 seconds (one hour). >>>> Now >>>> the test is running, while my CPU-usage is idling at away between 2 >>>> and >>>> 5 %. >>>> At the same time I'm writing this question. So all in all a much >>>> better >>>> situation. >>>> >>>> My question: Is JMeter loading all 3600 threads in memory, resulting >>>> in >>>> requiring that much memory and processor power? >>>> >>> >>> 3600 threads is rather a lot for one JMeter instance. >>> Too many for your test plan, as you have found. >>> >>> Note that a single thread can generate a much higher load than a >>> single user, as JMeter can issue requests much faster than a user >>> clicking links. >>> >>> >>>> Thanks, >>>> Abel >>>> >>>> -- >>>> View this message in context: >>>> http://www.nabble.com/3600-Threads-with-a-rampup-of-3600-seconds--tp18363108p18363108.html >>>> Sent from the JMeter - User mailing list archive at Nabble.com. >>>> >>>> >>>> --------------------------------------------------------------------- >>>> To unsubscribe, e-mail: [EMAIL PROTECTED] >>>> For additional commands, e-mail: [EMAIL PROTECTED] >>>> >>>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: [EMAIL PROTECTED] >>> For additional commands, e-mail: [EMAIL PROTECTED] >>> >>> >>> >> >> -- >> View this message in context: >> http://www.nabble.com/3600-Threads-with-a-rampup-of-3600-seconds--tp18363108p18376917.html >> Sent from the JMeter - User mailing list archive at Nabble.com. >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > > > > -- > diem perdidi > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/3600-Threads-with-a-rampup-of-3600-seconds--tp18363108p18379363.html Sent from the JMeter - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
