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tstellanova/headless_gpu_testing.md

Last active August 9, 2019 23:40
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Create a framebuffer for headless GPU operations
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headless_gpu_testing.md

If you attempt to run GPU rendering code (such as OpenGL code) while ssh'd to a server, you'll get errors such as:

    Running `/home/rockpi/proj/glutin/target/debug/examples/headless`
thread 'main' panicked at 'Failed to initialize any backend! Wayland status: NoCompositorListening X11 status: XOpenDisplayFailed', /home/rockpi/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.20.0-alpha2/src/platform_impl/linux/mod.rs:480:9

If you check echo $DISPLAY you'll see that no display is set.

To remedy this, install xvfb: sudo apt install xvfb

Then you can run eg:

Xvfb :1 -screen 1 1600x1200x16&
export DISPLAY=:1

Followed by whatever OpenGL code you like.

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