#pypy on 2018-09-27 — irc logs at freenode.irclog.whitequark.org

2018-02-26 15:52 cfbolz changed the topic of #pypy to: PyPy, the flexible snake (IRC logs: https://botbot.me/freenode/pypy/ ) | use cffi for calling C | the secret reason for us trying to get PyPy users: to test the JIT well enough that we're somewhat confident about it

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02:38 <_aegis_> has anyone played around with caching parts of the pypy build?

02:53 <tumbleweed> it doesn't do any kind of separate compilation, so you can't really

03:05 <_aegis_> not talking about like ccache, I assume there are steps in the process that when viewed by themselves take a hashable input and produce roughly the same output

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03:08 <tumbleweed> no, the build is one massive step, that generates C (non-deterministicly) followed by a traditional makefile + c compiler

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03:16 <_aegis_> I've looked at a few of the intermediate steps, and I think "one massive step" is a drastic oversimplification

03:17 <simpson> It's very dependent on the C toolchain and environment.

03:21 <_aegis_> I'm not surprised if the C compilation part seems harder to cache, I'm talking more about the intermediate bits

03:21 <simpson> Yes, what's in those intermediate bits is heavily customized for the C toolchain.

03:23 <simpson> There *was* work on the kind of incremental behavior that you're talking about, but I don't know what the status is.

03:24 <_aegis_> I don't even see the kind of caching I'm talking about as incremental, you'd be running rpython from the start each time, I'd probably run a profiler and guess at whether some of the expensive parts could be hashable

03:24 <_aegis_> though I shudder to think how long it takes to profile the build

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03:25 <simpson> Write a tiny toy RPython entrypoint and profile that. It can take under a minute.

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21:33 <shodan45> reading https://morepypy.blogspot.com/2018/09/inside-cpyext-why-emulating-cpython-c.html - what does the "W_" prefix mean in rpython/pypy?

21:40 <Alex_Gaynor> "Wrapped"

21:41 <Alex_Gaynor> so a W_Int is a python object, which "wraps" a machine integer

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22:04 <shodan45> oh, duh. :)

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