Yep, when Chromium ate up all the memory, it just hang the whole OS, waiting for OOM killer about 10+ min, then the cursor can be moved again, then freeze again...
If you want hilarious fun: make a gl shader than takes ~30 seconds to run. GPUs are only very recently preemptable (if they are at all yet? I lose track of what is “planned” vs released).
Make it run that shader in a loop.
See how well your system appears to respond.
IIRC macOS has a 60s or something watchdog the hard resets the GPU, while the gpu is hung the screen is not updated. Everything is running fine, cpu isn’t pinned or anything, but the gpu is blocked so no compositing, and so no screen updating.
I’m not sure what Linux does in that case, and I think windows may be able to paint because the directx driver interfaces let it do ... something? I’ve always assume some way to dma straight to the framebuffer, but no real idea :)
olliej|6 years ago
Make it run that shader in a loop.
See how well your system appears to respond.
IIRC macOS has a 60s or something watchdog the hard resets the GPU, while the gpu is hung the screen is not updated. Everything is running fine, cpu isn’t pinned or anything, but the gpu is blocked so no compositing, and so no screen updating.
I’m not sure what Linux does in that case, and I think windows may be able to paint because the directx driver interfaces let it do ... something? I’ve always assume some way to dma straight to the framebuffer, but no real idea :)