Re: [Ptolemy] [Info] needed regarding execution under SDF model

[Stephen Andrew Neuendorffer]

It sounds like what you want is to put a downsampler between HT1 and HT2 with
a rate of N1.   With the correct setting of the phase parameter, the 
downsampler
will discard all but the last token out of N1.  This token will be passed 
to HT2.
similar for the connection between HT2 and HT3.  With the token rates of 
each port of
HT1, 2, 3 set to one, you will get the dataflow you want.   Setting the 
iterationCount parameter
of the SDF director to 1 will cause the model to stop executing after HT3 
executes once.

Unfortunately, it means that each firing HT1 produces an dummy value.  To be a
technically valid SDF model it must...  From the point of view of the 
interface of HT1 alone,
I'm a bit at a loss as to why it must execute N1 times?  In seems to me 
like the
N1 firings of HT1 and the N2 firings of HT2 could be hidden inside the 
actor, but without
more information about where the desired number of firings is coming from, 
I couldn't
hazard a guess as to the right way to represent it.

Steve

From: John Doe <[EMAIL PROTECTED]>
Subject: Help needed regarding execution under SDF model
Date: Tue, 01 Jun 2004 18:07:31 +0200
Hello, I need some help to be able to simulate a new langage in ptolemy.
I have a graph with several hierchical tasks (HT) : HT1 --- HT2 --- HT3
- ---
I need to execute HT1 N1 times before producing one result, this result is
consumed by HT2. I don't need to execute HT1 anymore.
After i need to execute HT2 N2 times before producing one result this
result is consumed by HT3. And i don't need to execute HT2 anymore.
and so on ...
N1 is different from N2, N2 from N3 ...
Is there a way to do it properly using an SDF director or any other
directors ?
Thanking you in advance
Philippe
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