Wireshark mailing list archives
Re: Why does the extcap stuff take so long to start up?
From: Michał Łabędzki <michal.tomasz.labedzki () gmail com>
Date: Tue, 28 Mar 2017 08:26:27 +0200
At the moment there is a timeout of 4s to allow androiddump to connect to ADB.
I should be fixed right now and timeout should be 10ms (aka non-blocking socket on Windows and <maybe> on Linux/FreeBSD). If it is no 10ms (no ADB daemon started), then there is only a need to do truly non-blocking socket also for Linux/etc. (follow Windows solution). Current solution works (for me) on Linux (Ubuntu and LFS). The question is why there is significant delay for Guy, but not for me. I use Linux+cmake (out of source) + run Wireshark(s) from, build directory. Dario, could you share your results for: $ adb kill-server $ time run/extcap/androiddump --extcap-interfaces My results: real 0m0.013s user 0m0.000s sys 0m0.001s
about .26 seconds for randpktcdump
It seems that your OS is much more slower than me in case of loading programs. What is it? "strace -tt -v ./run/tshark -D" may show there reason for it. Is that true that g_dir_open() is call many times for all extcap captures? It may be slow on some file[/]systems. Maybe the problem is extcap architecture: "small" binaries that must be run. We can (?) change it to libraries (plugins) + one generic small application that use "plugin". Then it is possible to link or dlopen libraries by Wireshark, but still can run it as standalone apps. I think that can save significant loading time and multiplatform compatibility. In other words: ./genericExtcapTextUI --load=randpktdump --extcap-interfaces or ./wireshark # it dlopen("libextcap_randpkt.so") etc. 2017-03-27 22:33 GMT+02:00 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. ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: https://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
-- Michał Łabędzki ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: https://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
Current thread:
- Why does the extcap stuff take so long to start up? Guy Harris (Mar 26)
- Re: Why does the extcap stuff take so long to start up? Michał Łabędzki (Mar 26)
- Re: Why does the extcap stuff take so long to start up? Guy Harris (Mar 27)
- Re: Why does the extcap stuff take so long to start up? Dario Lombardo (Mar 27)
- Re: Why does the extcap stuff take so long to start up? Guy Harris (Mar 27)
- Re: Why does the extcap stuff take so long to start up? Michał Łabędzki (Mar 27)
- Re: Why does the extcap stuff take so long to start up? Dario Lombardo (Mar 28)
- Re: Why does the extcap stuff take so long to start up? Anders Broman (Mar 28)
- Re: Why does the extcap stuff take so long to start up? Guy Harris (Mar 27)
- Re: Why does the extcap stuff take so long to start up? Michał Łabędzki (Mar 26)