Re: [boost] [1.58.0] Release candidates available

Subject: Re: [boost] [1.58.0] Release candidates available
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2015-04-07 16:33:33

On 04/07/2015 10:42 PM, Bjørn Roald wrote:

>> Rob, it used to be possible to do:
>>
>>      import option ;
>>      option.set jobs : 4 ;
>>
>> in user-config.jam, but that appears to have regressed. Is that what
>> you're after?
>>
>
> This would be a nice config setting.

Okay, I'll see whether I can revive it.

>
> Also, in principle, bjam could check available free RAM before invoking a new parallel task.  I think -j 4 does not mean it _has_ to run 4
> tasks in parallel, rather it means up to 4 tasks in paralell.  An implicit -j <hardware_concurrency> certainly should throttle on system
> resources, so why not available RAM as well as available cores.

I don't think it's easy. If I run 4 compilations in parallel, and it consumes so much RAM and I/O that computer becomes
unresponsive, it means the OS could not throttle these tasks effectively. And if OS, having all information at hand, fails, then
b2 has no chance.

-- 
Vladimir Prus
CodeSourcery / Mentor Embedded
http://vladimirprus.com