Hello, I want to measure the utilization of my resources for different request rates. For example my measurements will be:
1st measurement: 100 requests/s over 30 min 2nd measurement: 200 requests/s over 30 min and so on Until now I used constant throughput timer with the option all active threads (together). I used a stepping thread group from jp@gc plugin with: start 1000 threads First wait for 0s Then start 1000 threads every 20s using ramp-up 5s Then hold load for 1800s Finally stop 1000 threads every 20s As listener I use sumary report and show results in table. If I use the constant throughput timer with 18000 requests/minute, the throughput in summary report is 333,33 requests/s (constant) instead of 300 requests/s as wished. Even with 16000 requests/minute the throughput goes up to 333,33 requests/second. Could someone explain, why this is the case? I just want to have constant 300 requests/s over 30 minutes, the rate should not alter between e.g. 280 and 320. For 50, 100, 200 requests/s everything worked fine, but now with 300 requests/s it goes up to 333 requests/s in the end. The avg. latency of my requests is 5 ms. It didn't work, so I took jp@gc Throughput shaping timer. Now my summary report displays 296,6 requests/s in the end (and during the whole measurement). This is ok , BUT now the load of the server goes up from 0,03 at the beginning to 3,05 (15 min), 4,14 (5 min), 5,00 (1 min). This was not the case without the plugin. In this case the load value was at 0,7 (15 min) at the end. The avg CPU utilization for both cases is 30%, the avg. network send / rec is only at 200-400 K, free RAM only goes down from 700 MB free to 400 MB free in these 30 minutes. Everything is nearly the same in both cases, except the load value. Can someone please explain, why the load rises to this extend compared to the constant throughput timer? Later I want to shape the request rate, eg. from 100 to 1000 and back to 100 requests/s. So I need the throughput shaper, but I want to have a normal load value. How can I achieve this? Is there another throughput shaper for my case? Thanks a lot! Best regards Birgit --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
