Michael Foord wrote:
> Dino Viehland wrote:
>   
>> I'm not actually the one working on the engine APIs so that's the reason 
>> I've tended to be vague.  I'll talk to the people doing it and let you know 
>> what I hear.
>>
>> But the more info you can give us the better decision we'll be able to make. 
>>  For example what do you actually need to be isolated?  Do you need multiple 
>> system states so they get their own modules, console, etc...  do you need 
>> everything in sys isolated?  Do you need to guarantee the isolation even if 
>> .NET code is called (e.g. they could smuggled data via a static field).  If 
>> they do need some rather high level of isolation are app domains good 
>> enough?  Do you need to marshal a lot of data in/out?  Or is the effort to 
>> spin up and use app domains correctly?
>>   
>>     
> At Resolver we are currently using multiple IronPython engines. Moving 
> to AppDomains is a long term goal for us, but is actually quite a lot of 
> work (we would have *lots* of cross-domain calls and so to avoid that we 
> have to find an efficient way of pumping lots of data in and then out of 
> the app domain).
>
> Switching to app domains is not a high priority task for us, and in the 
> meantime we *can't* upgrade to IronPython 2 if it doesn't support 
> multiple engines.
>
> Isolation of engines is only a minor benefit (it is a positive side 
> effect - but not the reason we started using them) for us at the moment, 
> and an isolated system state (although nice) is not vital.
>
>   

In fact, the reason we started using multiple engines was to divert the 
standard output of simultaneously running user scripts to different 
output windows...

Michael


> All the best,
>
> Michael Foord
> http://www.voidspace.org.uk/ironpython/index.shtml
>
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>   

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