[Development] QProcess fork() failure and overcommit

[Simon Hausmann]

I understand that this is in the context of Linux without overcommit.

Simon

> On 7 Mar 2017, at 22:05, Thiago Macieira <thiago.macieira at intel.com> wrote:
> 
> Em terça-feira, 7 de março de 2017, às 17:53:41 CET, René J.V. Bertin 
> escreveu:
>> One tends to forget (I do at least) that spawning a little helper process
>> can be quite expensive, sometimes prohibitively so. Makes you wonder what
>> kind of cross-platform alternatives there are!
> 
> It shouldn't be.
> 
> fork() does need to copy the page tables and mark the pages as shared. It also 
> means COW of certain pages. But the overhead shouldn't be that big.
> 
> If anyone is seeing this, can you run your application with strace to get the 
> timings? 
> 
>    strace -T -e clone
> 
> Add -f if the forking is happening outside the main thread.
> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel Open Source Technology Center
> 
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