Subject: Re: [Boost-build] Python Port Updates
From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2016-09-26 15:37:59
On Mon, Sep 26, 2016 at 2:34 PM, Rene Rivera <grafikrobot_at_[hidden]> wrote:
> On Mon, Sep 26, 2016 at 2:23 PM, Steven Watanabe <watanabesj_at_[hidden]>
>> On 09/26/2016 11:20 AM, aaron_at_[hidden] wrote:
>> > The biggest performance hit is the Features, Properties,
>> > and PropertySet instances. Based on the fact that there
>> > is a property_set module written in C, I'm assuming that
>> > Jam, at one point, suffered the same problem.
>> It still does have this problem. Even after
>> all the optimizations I made, a significant
>> fraction of memory usage and running time is
>> spent in this area. The Jam implementation
>> may not be as slow as python, but it's not
>> exactly fast either.
> Actually.. I've been doing some perf measurements in the past few days on
> b2 engine and I was rather surprised where the time goes (not the memory).
> For example, currently, the most expensive operation is in switching module
> contexts. Specifically here <https://github.com/boostorg/
> build/blob/develop/src/engine/function.c#L4169>. There are many reasons
> for why that's slow (some obvious from just looking at those few lines).
> But the key problem in the current implementation is that other than the
> optimization work Steven did we haven't done design changes for
> optimizations. But that's something I was about to get into in an imminent
> future email :-)
Grr.. And that's the wrong line link.. Here's the correct one <
-- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail
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