[kepler-users] SDF Firing Order

[Kenneth Evans]

>> Looks to me like org.geon.FileWrite should be providing a PortParameter
rather than a parameter to specify the file name...

That would be nice and would fix this problem.
 
>> SDF uses data precedences to determine firing order.

Does that mean I should not have to worry about the order?  I seem to be
finding other examples where the order is wrong (i.e. not what I want).  The
SDF precedence mechanism doesn't seem to be capable of handling this
situation (with the actor as is).  In fact, it really has no way of knowing
which order you want.  Either could make sense.  It would probably be a
major change to add a feature that could be used to specify the desired
order in cases of ambiguity.  Or maybe there is reason not to?
 
BTW in Kepler even though the description says it is org.geon.FileWrite, it
is really in ptolemy.actor.lib.io.

Thanks,

        -Ken

-----Original Message-----
From: Edward A. Lee [mailto:eal at eecs.berkeley.edu] 
Sent: Thursday, November 15, 2007 4:36 PM
To: Kenneth Evans
Cc: Kepler Mailing List
Subject: Re: [kepler-users] SDF Firing Order


SDF uses data precedences to determine firing order.
Looks to me like org.geon.FileWrite should be providing a PortParameter
rather than a parameter to specify the file name...

Edward


At 04:11 PM 11/14/2007, Kenneth Evans wrote:
>Hi,
> 
>In SDF if two actors have their input ports connected to a relation, what
determines which fires first?  Since the order may be important, is there a
way to insure the order you want.
> 
>In particular, the attached example, which uses a File Writer actor with
the fileName determined by a workspace parameter that is set by the same
relation that determines the File Writer input, does not work correctly
because the parameter is set after the File Writer fires.
> 
>Maybe there is a better way to specify a variable fileName to a File Writer
in the first place (in which case I would appreciate some guidance), but
this is not the only workflow in which I am having a firing-order problem.
> 
>Thanks,
> 
>        -Ken
> 
>
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------------ 
Edward A. Lee
Chair of EECS and Robert S. Pepper Distinguished Professor
231 Cory Hall, UC Berkeley, Berkeley, CA 94720-1770
phone: 510-642-0253, fax: 510-642-2845
eal at eecs.Berkeley.EDU,
http://www.eecs.berkeley.edu/Faculty/Homepages/lee.html