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Docs: FAQ: Add illegal instruction error.

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Brandon Amos 2016-01-19 14:19:01 -05:00
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@ -31,3 +31,19 @@ see [the raw data](/data/2016-01-19/execution-times.txt).
[here](http://dlib.net/face_landmark_detection_ex.cpp.html).
Use the `-DUSE_AVX_INSTRUCTIONS=ON` in the first `cmake` command.
If your architecture does not support AVX, try SSE4 or SSE2.
## I'm getting an illegal instruction error in the pre-built Docker container.
This is unfortunately a result of building the Docker container
on one machine that compiles software with non-standard CPU flags
and creates illegal instructions on architectures that don't support
the additional CPU features.
Using the binaries from the pre-built container on a CPU that
doesn't support these features results in the illegal instruction error.
We try to prevent these as much as possible by building the images
inside of a Docker machine.
If you are still having these issues, please fall back to building
the image from scratch instead of pulling from Docker Hub.
Instructions for doing this are in our
[setup guide](http://cmusatyalab.github.io/openface/setup/).