The following are the most common scenarios that may require changing the default settings: I am building NumPy for my local useĪnd I do not intend to export the build to other users or target a different CPU than what the host has. Raising the ceiling of the baseline features will often improve performance and may also reduce binary size. In general, the default settings tend to not impose certain CPU features that may not be available on some older processors. global- option= "-cpu-baseline=avx2 fma3" \ You can also customize CPU/build options through PIP command: pip install -no-use-pep517 - global- option=build \ Python setup.py build_clib -cpu-baseline= "avx2 fma3" install -user To customize only build_clib: cd /path/to/numpy Python setup.py build_ext -cpu-baseline= "avx2 fma3" install -user
To customize only build_ext: cd /path/to/numpy Python setup.py build -cpu-baseline= "avx2 fma3" install -user To customize both build_ext and build_clib: cd /path/to/numpy That fixed it.If build_clib or build_ext are not specified by the user, the arguments of build will be used instead, which also holds the default values. Completely shutdown the computer and then turn it back on. Update: It happened again and sleep did not help. That way the computer switched to the C3 sleep state and by waking up something got switched back to where it was supposed to be. What actually helped was instead of restarting to use sleep. That is probably why turning on and off does not help, because there is no power state change in between. It seems that for one reason or another Windows thinks that the "normal" power state is the power state that's supposed to be lowest possible. This was actually caused by the fact, that the brief sleep allowed the battery to charge above the critical treshold. What misled me was that when I put the PC to sleep and woke it up again it was fixed.
When battery level is back to reasonable level, CPU spins up to 3GHz as it's supposed to. When battery level is critical, CPU underclocks itself to save energy. This led me to the actual cause, which is: critical battery level. The processor has been in this reduced performance state for XY seconds since the last report.
The speed of processor 0 in group 0 is being limited by system firmware. After much research I finally found out what's causing the issue.
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