Re: [Boost-build] Python Port Updates

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]>
> wrote:
>
>> AMDG
>>
>> 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 <
https://github.com/boostorg/build/blob/develop/src/engine/function.c#L3850>.

-- 
-- Rene Rivera
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