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| From: | Roshan D'Souza |
| Subject: | Re: [Swarm-Modelling] ABMs on Graphical Processor Units |
| Date: | Thu, 10 Jan 2008 09:34:53 -0500 |
Seth Tisue wrote:Unless there are high level operators that express concurrency (e.g. map
> Russell> I think the most useful outcome of this work would be a
> Russell> library of data structures and algorithms with a C language
> Russell> interface (with a JNI Java interface a relatively trivial
> Russell> proposition on top of that) that provides useful building
> Russell> blocks for ABMs. Such a library would be useful for all of the
> Russell> above toolsets (except perhaps NetLogo, for which is not
> Russell> obvious how you call the Java layer from logo).
>
> (NetLogo models may call out to arbitrary Java code. This is documented
> at http://ccl.northwestern.edu/netlogo/docs/extensions.html .
a function over a space, or merging discrete event schedules across
agents), I don't think it will work very well to just layer on a
library. I think what's probably ideal is not a library but a compiler
for an appropriate high level language for ABM. Maybe write a MetaABM
GCC or LLVM frontend? Short of something like that, I think the only
way to go is to write several tuned libraries for specific tasks (e.g
spaces) which are also for specific architectures (assuming there are
sensible interfaces from above).
There are people working on adapting GOMP (GCC's OpenMP) for the Cell.
One idea would be to extend GCC's Java compiler with some kind of
OpenMP-like directives. But for Java on Cell it's just such a big VM
to slosh around. I can't believe that would ever work well. Unclear
what kind of progress is being made on IBM's X10, but it doesn't sound
to me like that project has displaced IBM's standard compiler suite (and
Octopiler), or the Cell Superscalar project.
Marcus
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