Hello!
On Tue, May 22, 2018 at 12:37:18PM -0400, rickGsp wrote:
> >>- Make sure the $host variable you use for the limiting is not
> >>empty and not changed between requests created by your testing
> >>tool. Try logging the variable to see if it changes or not.
> >>Alternatively, replace it with a static string to see if it helps.
>
> Checked. $host variable is set for all the requests.
>
> >>- Make sure there are no unrelated requests in the log. In
> >>particular, you may want to use different logs in the server{}
> >>block you are limiting and in the http{} block.
>
> Checked. There are no unrelated requests in the log.
>
> >>- Try another tool to see if you are able to reproduce the same
> >>effect. Something simple like "ab" or "http_load" might be a
> >>good choice.
>
> Checked with "ab" with as following (concurrency 700 requests);
> ab -n 20000 -c 700 https://9.0.0.10:443/test.html
>
> Here is the piece of output. As per the report test ran for approx. 50
> seconds and 20000-14622 = 5278 requests returned with success. This is as
> expected as per rate limiting at 100r/s for 50 seconds test. Notice that
> Mean requests processed per second is 396.
>
> Concurrency Level: 700
> Time taken for tests: 50.437 seconds
> Complete requests: 20000
> Failed requests: 14722
> Requests per second: 396.53 [#/sec] (mean)
>
> Access log report for this test as per the following command seems to be
> fine: grep ' 200 ' /path/to/log | awk '{print $4}' | uniq -c
> 111 [22/May/2018:15:35:04
> 101 [22/May/2018:15:35:05
> 95 [22/May/2018:15:35:06
> 98 [22/May/2018:15:35:07
> 97 [22/May/2018:15:35:08
> 106 [22/May/2018:15:35:09
> 95 [22/May/2018:15:35:10
> 99 [22/May/2018:15:35:11
> 104 [22/May/2018:15:35:12
> 106 [22/May/2018:15:35:13
>
>
> In another test, I ran two instances of "ab" in parallel with same
> configuration and following is the output.This is again approx. 50 seconds
> test. By combining both the reports (20000+20000) - (9344+10239) = 20417
> requests returned with success. This is four times of expected 5000
> requests/sec rate. I would like to understand this behaviour. I guess this
> is happening in my tests as well. In my case I just keep pushing requests
> without waiting for response.
>
> First instance:
> Concurrency Level: 700
> Time taken for tests: 46.944 seconds
> Complete requests: 20000
> Failed requests: 9344
> Requests per second: 426.04 [#/sec] (mean)
>
> Second Instance:
> Concurrency Level: 700
> Time taken for tests: 53.344 seconds
> Complete requests: 20000
> Failed requests: 10239
> Requests per second: 374.92 [#/sec] (mean)
>
>
> Access log report for this test as per the following command does not seem
> to be fine: grep ' 200 ' /path/to/log | awk '{print $4}' | uniq -c
> 180 [22/May/2018:15:52:59
> 276 [22/May/2018:15:53:00
> 33 [22/May/2018:15:53:01
> 20 [22/May/2018:15:53:00
> 70 [22/May/2018:15:53:01
> 1 [22/May/2018:15:53:00
> 181 [22/May/2018:15:53:01
> 16 [22/May/2018:15:53:02
> 2 [22/May/2018:15:53:01
> 99 [22/May/2018:15:53:02
> 1 [22/May/2018:15:53:01
> 177 [22/May/2018:15:53:02
> 329 [22/May/2018:15:53:03
> 8 [22/May/2018:15:53:02
Please show "uname -a", "nginx -V", and "ps -alxww | grep nginx"
output.
--
Maxim Dounin
http://mdounin.ru/
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