| Re: load sharing on multiple machines? [message #28908 is a reply to message #28885] |
Wed, 16 January 2002 20:07  |
Mark Rivers
Messages: 49
Registered: February 2000
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Member |
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Mike Miller <mmiller3@iupui.edu> wrote in message
news:yaghepmncy4.fsf@iupui.edu...
> Dear IDL'ers,
>
> I'm a new IDL user and I've got some image reconstruction tasks
> that are done on a slice-by-slice basis. I think that this will
> make it simple for me to run IDL programs on several different
> machines, each doing a subset of the slices, so that overall
> processing time will be reduced. I've got a stack of Linux PCs
> and some shiny new windows 2000 PCs to do this on. These windows
> machines run at 1.8 GHz and I'd like to take advantage of all the
> wasted cycles that aren't needed when the users are doing their
> email and text processing.
>
> Does anyone out there have any experience or suggestions on ways
> to implement this? I can work it out with scripts on the linux
> boxes, but I'm at a loss for how to do it with the windows
> machines. Is it even possible to work them into the mix?
> (without turning them into Linux boxes that is...)
I am doing tomography reconstruction that sounds similar to what you want to
do. I am currently running on a single Windows machine, but with dual-CPUs.
Both IDL and the Intel Math Kernal Library that I use for FFT-based
reconstruction take advantage of both CPUs.
I have thought about what you are trying to do, use multiple machines, but
have not done it yet.
Here are some possible approaches:
- One IDL process on one machine is the "master" and sends jobs to be run on
other "server" machines. This could be accomplished by writing a file on
the server, which IDL on that server is waiting to read. It could also be
accomplished by running a server task each the server machine that listens
for socket connections from the IDL master. IDL has a socket client
interface.
- You could use MPI to parallelize the reconstruction. There is a group at
Argonne who have this running on Windows machines for tomography
reconstruction. Contact Francesco De Carlo (decarlo@aps.anl.gov) for more
information. This is not using IDL, but I think IDL could be interfaced to
it.
You might be interested in my Web page:
http://cars.uchicago.edu/software/tomography.html
This describes the IDL software that I've written for tomography
reconstruction, including a new GUI interface to control it.
Mark Rivers
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