There was a question from Shannon about ""what people think is a
acceptable slowdown for single-threaded code"" ... he had estimated
an impact "in the 15-20% range"
Horror!
To me, the acceptable slowdown is exactly zero.
I can already use multiple cores by running multiple Python processes.
Any slowdown of single-process performance would be a terrible step backwards.
Python is already slow. It should look at PHP and see what it can take out of their book. PHP 7, which had no JIT, was already about 6x faster than Python. PHP 8 is even faster for some workloads. I'm not sure if the overhead of a JIT makes sense though. But PHP 7 is a good place to look for a performance benchmark.
To me, the acceptable slowdown is exactly zero.
I can already use multiple cores by running multiple Python processes.
Any slowdown of single-process performance would be a terrible step backwards.
Python is already slow. It should look at PHP and see what it can take out of their book. PHP 7, which had no JIT, was already about 6x faster than Python. PHP 8 is even faster for some workloads. I'm not sure if the overhead of a JIT makes sense though. But PHP 7 is a good place to look for a performance benchmark.