Re: [boost] [xint] Third release is ready, requesting preliminary review

Subject: Re: [boost] [xint] Third release is ready, requesting preliminary review
From: Chad Nelson (chad.thecomfychair_at_[hidden])
Date: 2010-05-02 12:57:27

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On 05/02/2010 09:49 AM, Marius Stoica wrote:

>> I've used a few of those, and haven't noticed a major compile-speed
>> problem, which is an argument in your favor.
> 
> Dunno if you notticed but i was just checking the first boost
> libraries in alphabethic order. I guess what i was trying to say is
> that pretty much all the boost libraries are like this. It's ...
> tradition :)

Just not a tradition that I've personally experimented with. :-)

> Also i'm not certain the headers need to be parsed every time anyway.
> Most compiler support precompiled headers. If compilation speed
> becomes too much of an issue I'm sure they'll become more widely
> used.

Another good point.

>> Also, multithreaded operation is still fairly uncommon. I'd hate to
>> make everyone pay for something that only a few need, especially
>> when the speed cost is so high (the single-threaded version is
>> *twice* the speed of the multithreaded one).
> 
> How did you managed to get that difference anyway since threads are
> just processes without the memory protection.

Copy-on-write. Though please see my reply to Joel Falcou this morning; I
may have misinterpreted the results. I'll test that later today, when I
have some free time.

> C++11 will add several things related to this including thread local
> storage , move and others. Do you expect that with this the 
> difference will dissapear?

It's quite possible. Copy-on-write is still measurably faster than
emulated move semantics via Boost.Move, but built-in ones could very
well erase that difference.

> If so i think it's best to support this with a compile flag since
> that can be easily deprecated.

That's how I'm doing it now. :-)
- -- 
Chad Nelson
Oak Circle Software, Inc.
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