[Python-Dev] Computed Goto dispatch for Python 2 (original) (raw)

Gregory P. Smith greg at krypto.org
Thu May 28 19:13:29 CEST 2015

On Thu, May 28, 2015 at 9:08 AM Guido van Rossum <guido at python.org> wrote:

Wow. Such thread. :-)

This patch could save companies like Dropbox a lot of money. We run a ton of Python code in large datacenters, and while we are slow in moving to Python 3, we're good at updating to the latest 2.7.

Dropbox should be compiling its own interpreter with whatever patches it deems appropriate. The people it'll save resources for are companies not enlightened enough to do that: thousands of them, generally small or non-tech focused :)

The patch is forward and backward compatible.I'm strongly in favor.

+1 I'm in favor as well. I mostly wanted to make sure that people were aware of profile-opt builds and that it was being compared. Sounds like both benefit, even used together. Win win.

This is a 100% API compatible change. It just rearranges the interpreter loop on compilers enlightened enough to allow it. I was always bummed that it didn't make it into 2.7 itself. But given the world+dog is going to have 2.7 around and kicking for a long time, lets save the world some CPU cycles (read: carbon) for little effort. Very practical. Good for the world.

People who need to save orders of magnitude more cycles shouldn't use an interpreter. ie: PyPy. Or consider the costs of moving to a compiled language.

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