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How is overall elapsed time calculated

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Thirukumaran
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Thirukumaran asked on 03 Jul 2019, 07:16 AM

If you look below the overall elapsed time given by fiddler is 1.377 seconds but when calculate the time between 11:56:17.495 & 11:56:20.382 it looks like it took 0:00:02.887 So how is the overall elapsed item calculated.

ClientConnected:11:56:17.495
ClientBeginRequest:11:56:19.004
GotRequestHeaders:11:56:19.004
ClientDoneRequest:11:56:19.004
Determine Gateway:0ms
DNS Lookup: 0ms
TCP/IP Connect:0ms
HTTPS Handshake:0ms
ServerConnected:11:56:17.744
FiddlerBeginRequest:11:56:19.004
ServerGotRequest:11:56:19.005
ServerBeginResponse:11:56:20.382
GotResponseHeaders:11:56:20.382
ServerDoneResponse:11:56:20.382
ClientBeginResponse:11:56:20.382
ClientDoneResponse:11:56:20.382

Overall Elapsed:0:00:01.377

 

 

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Eric R | Senior Technical Support Engineer
Telerik team
answered on 08 Jul 2019, 10:04 PM
Hi Thirukumaran,

The Overall Elapsed time from the Statistics tab is calculated using the ​ClientDoneResponse​ value less the ​ClientBeginRequest value. Note that by default, Fiddler captures timestamps using the default system clock with a precision of 15.6 milliseconds (ms). If an operation takes less time than the 15.6ms it will appears as no time at all. This may result in slightly rounded values.

For example, the provided ClientDoneRepsonse of 20.382 less the ClientBeginRequest of 19.004 is 1.378 which is about what the overall elapsed time is recorded. 

To enable high-resolution timers of 1ms instead of 15.6ms, select the checkbox under Tools > Fiddler Options > General tab. This will also increase power consumption on mobile devices and laptops.




Please let me know if you need any additional information and thank you for using the Telerik Fiddler forums.

Regards,

Eric R
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Eric R | Senior Technical Support Engineer
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