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I'm looking for debug tools for X.

Something like tcpdump or strace for X protocol. To debug X windows.

You can read my another question here: https://stackoverflow.com/questions/25182216/xterm-randomly-hangs-while-scrolling-in-vim-inside-screen

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Watch0nMe
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xtruss, xtrace and xmon. Wireshark also has a good x11 dissector. All of them have good core protocol support but may lack some extensions. Also note that most of GL calls are serialized using it's own protocol inside glxRender request body when using indirect opengl, and direct gl completely bypasses x11 after allocation of screen buffer using DRI extension.

Andrey Sidorov
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  • I'm currently read about wireshark here http://xwindow.angelfire.com/page23.html, looks like such information must be in wiki http://en.wikipedia.org/wiki/Strace – Watch0nMe Aug 12 '14 at 13:50