[LAU] OS for realtime operation

[fred]

Le 10/01/2012 13:44, Paul Davis a écrit :
> On 1/10/12, Jeremy Jongepier<jeremy at autostatic.com>  wrote:
>    
>> On 01/09/12 23:01, Moshe Werner wrote:
>>      
>>> Something little OT, but what exactly is the difference between
>>> Windows/Mac, where one doesn't need an rt kernel to run realtime
>>> processes,
>>> and Linux which needs one?
>>>        
>> Hello Moshe,
>>
>> On Linux you don't need a real-time kernel to run real-time processes
>> either.
>>      
> to clarify a little more:
>
> 1) on linux, **access** to realtime scheduling is not necessarily
> granted to normal users, unlike the situation on windows and OS X. on
> any sane linux system, this is easy to alter. on any sane linux system
> that targets music/pro-audio/media production, its already set up that
> way and so there is no difference between these systems and windows or
> OS X in this regard.
>
> 2) the PREEMPT_RT kernel is substantially "more realtime" than any
> version of windows or OS X that you could lay your hands on. its more
> like an actual realtime OS than the kind of general purpose OS that
> regular Linux, Windows and OS X represent, though without actually
> being suitable (quite) for "hard RT" tasks.
>    
To add, even if it's not IMHO something good, (clearly it's a shameful 
job) :
Linux machines are the standard for "high frequency trading"
Almost just because they can really go RT


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