Re: Why does the extcap stuff take so long to start up?

[Guy Harris <guy () alum mit edu>]

On Mar 27, 2017, at 1:14 PM, Guy Harris <guy () alum mit edu> wrote:

> Currently, with that fix, I get results like
>
> $ time ./tshark -r /tmp/nothing.pcap 
>
> real    0m1.407s
> user    0m0.312s
> sys     0m0.676s
>
> with the extcap directory in place and results like
>
> $ time ./tshark -r /tmp/nothing.pcap 
>
> real    0m0.334s
> user    0m0.182s
> sys     0m0.146s
>
> with the extcap directory moved out of the way, so the extcap executables are taking some time to run, but it's 
> better than wasting time trying to run androiddump.c or Makefile.am.

And, if I move various extcap executables out of the way:

$ time ./tshark -r /tmp/nothing.pcap            # all executables

real    0m1.484s
user    0m0.313s
sys     0m0.720s

$ time ./tshark -r /tmp/nothing.pcap            # after removing androiddump

real    0m1.179s
user    0m0.287s
sys     0m0.588s

$ time ./tshark -r /tmp/nothing.pcap            # after removing ciscodump

real    0m0.950s
user    0m0.254s
sys     0m0.491s

$ time ./tshark -r /tmp/nothing.pcap            # after removing randpktcdump

real    0m0.688s
user    0m0.228s
sys     0m0.334s

$ time ./tshark -r /tmp/nothing.pcap            # after removing sshdump

real    0m0.493s
user    0m0.198s
sys     0m0.235s

$ time ./tshark -r /tmp/nothing.pcap            # after removing udpdump

real    0m0.335s
user    0m0.183s
sys     0m0.145s

So that's about .3 seconds for androiddump, about .23 seconds for ciscodump, about .26 seconds for randpktcdump, about 
.19 seconds for sshdump, and about .16 seconds for usbdump.

So none of them are individually out of the ordinary, but about 1.5 to 2.5 seconds per program, with 5 programs, adds 
up.
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