Wireshark · Wireshark-dev: Re: [Wireshark-dev] Tips regarding measuring function execution times

[Roland Knall <rknall@xxxxxxxxx>]

Keep in mind, that printf is by far one of the slowest functions. Additionally it slows also down the output as well. I'd recommend writing the times into a buffer and dumping them in intervalls, very much like the tap's work, otherwise what you see might not be what is happening on the network.

cheers

On Sun, Oct 15, 2017 at 11:15 PM, Paul Offord <Paul.Offord@xxxxxxxxxxxx> wrote:

Thanks to all for the tips.  I’ll give it a go.

 

From: Wireshark-dev [mailto:wireshark-dev-bounces@wireshark.org] On Behalf Of Pascal Quantin
Sent: 15 October 2017 21:50
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Tips regarding measuring function execution times

 

 

 

2017-10-15 22:40 GMT+02:00 João Valverde <joao.valverde@tecnico.ulisboa.pt>:

On 15-10-2017 21:32, Peter Wu wrote:

On Sat, Oct 14, 2017 at 02:18:39PM +0000, Paul Offord wrote:

I'm investigating a performance problem with the TRANSUM dissector.  I'd like to measure the accumulated time taken to execute a function in a Release build.  My basic idea is to do something like this:

guint32 execute_time_us;
.
.
start_stopwatch(&execute_time_us);
function_call_to_be_measured();
pause_stopwatch(&execute_time_us);

.
.
.

stop_and_output_stopwatch(&execute_time_us);

Is there a standard way to do this in Wireshark?  How can I output the accumulated time on, say, the Status Line?

Not sure about the Status line question, but you can measure elapsed
microseconds with something like:

     guint64 start_time, end_time;

     start_time = g_get_monotonic_time();
     // ...
     end_time = g_get_monotonic_time();
     // ...
     g_print("elapsed us: %" G_GUINT64_FORMAT, end_time - start_time);

https://developer.gnome.org/glib/stable/glib-Date-and-Time-Functions.html#g-get-monotonic-time

I think console output doesn't work on Windows for graphical applications, or something like that. There isn't a better standard mechanism for debug output in Wireshark, that I know of.

 

You can make it appear with Edit -> Preferences -> Advanced -> change gui.console_open option to ALWAYS.

 

Pascal.

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