| Re: Generating N random numbers that add to a TOTAL [message #89253 is a reply to message #89252] |
Fri, 08 August 2014 15:00   |
Michael Galloy
Messages: 1114
Registered: April 2006
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Senior Member |
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On 8/8/14, 1:32 PM, rryan@stsci.edu wrote:
> Hi Mike, I might be interested in GPULib. I see it's quite pricey
> (at least for my budget) and Tech-X offers a free trial. But before
> I go through the trouble of even getting the free trial, what else
> can you tell me about GPULib?
A couple of resources:
* documentation for GPULib routines:
http://www.txcorp.com/images/docs/gpulib/1.6.2/html/index.ht ml
* I write about GPULib on my website occasionally, see:
michaelgalloy.com/index.php?s=gpulib&submit=Search
* The official blog is at hgpulib.blogspot.com
> Specifically, I was wondering about what hardware/software do I need
> to use GPULib? I use Mac OSX 10.8.5 and IDL 8.2.3 at present, and
> that sounded sufficient. But anything else I should be aware of?
> Such as GPU cards, RAM, etc.?
Currently, you absolutely need to have CUDA-enabled GPU (any modern
NVIDIA graphics card). The better the card, the better the performance.
Most laptop GPUs can get 2-5x speedup on our demos, while top-end GPUs
can get 40x or better speedups.
For software, IDL 8.2 and CUDA 5.0 on OS X (10.7+), Windows (7, Server
2008), or Linux (CentOS5, CentOS6, RedHat Enterprise Linux 5, Fedora
16). If your software doesn't quite match up, I can usually make a
custom build for you.
> Can you give any examples of the code usage? Like what will my IDL
> code now look like?
It could be as simple as:
gpuinit
dx = gpuFindgen(10)
dy = gpuFindgen(10)
dz = dx + dy
That last line could also be done this way:
dz = gpuFltarr(10)
dz = gpuAdd(dx, dy, LHS=dz)
which can be more efficient in certain situations.
There are basically a bunch of routines with the "gpu" prefix that have
a similar interface as the normal IDL library routine, but take GPU
variables instead of normal ones. See the API documentation link I gave
above for a list of routines available.
There are also several demos in the trial that you can see speedups and
browse example code.
> What about if I need to port the code to another workstation?
Should be fine (no modification) as long as the new workstation also
meets the requirements above.
> Anything else a GPU newbie (but seasoned IDLer) should know or should
> ask?
Not that I can think of, but feel free to ask if you have any more
questions!
Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
Research Mathematician
Tech-X Corporation
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