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Re: Parallelization of Python on GPU?

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GPU computing is great if you have the following:

1. Your data structures are arrays floating point numbers.
2. You have a data-parallel problem.
3. You are happy with single precision.
4. You have time to code erything in CUDA or OpenCL.
5. You have enough video RAM to store your data.

For Python the easiest solution is to use Numba Pro.

Sturla


Jason Swails <jason.swails@gmail.com> wrote:
> On Thu, 2015-02-26 at 14:02 +1100, Steven D'Aprano wrote:
>> John Ladasky wrote:
>> 
>> 
>>> What I would REALLY like to do is to take advantage of my GPU.
>> 
>> I can't help you with that, but I would like to point out that GPUs 
>> typically don't support IEE-754 maths, which means that while they are 
>> likely significantly faster, they're also likely significantly less 
>> accurate. Any any two different brands/models of GPU are likely to give 
>> different results. (Possibly not *very* different, but considering the mess 
>> that floating point maths was prior to IEEE-754, possibly *very* different.)
> 
> This hasn't been true in NVidia GPUs manufactured since ca. 2008.
> 
>> Personally, I wouldn't trust GPU floating point for serious work. Maybe for 
>> quick and dirty exploration of the data, but I'd then want to repeat any 
>> calculations using the main CPU before using the numbers anywhere :-)
> 
> There is a *huge* dash toward GPU computing in the scientific computing
> sector.  Since I started as a graduate student in computational
> chemistry/physics in 2008, I watched as state-of-the-art supercomputers
> running tens of thousands to hundreds of thousands of cores were
> overtaken in performance by a $500 GPU (today the GTX 780 or 980) you
> can put in a desktop.  I went from running all of my calculations on a
> CPU cluster in 2009 to running 90% of my calculations on a GPU by the
> time I graduated in 2013... and for people without as ready access to
> supercomputers as myself the move was even more pronounced.
> 
> This work is very serious, and numerical precision is typically of
> immense importance.  See, e.g.,
> http://www.sciencedirect.com/science/article/pii/S0010465512003098 and
> http://pubs.acs.org/doi/abs/10.1021/ct400314y
> 
> In our software, we can run simulations on a GPU or a CPU and the
> results are *literally* indistinguishable.  The transition to GPUs was
> accompanied by a series of studies that investigated precisely your
> concerns... we would never have started using GPUs if we didn't trust
> GPU numbers as much as we did from the CPU.
> 
> And NVidia is embracing this revolution (obviously) -- they are putting
> a lot of time, effort, and money into ensuring the success of GPU high
> performance computing.  It is here to stay in the immediate future, and
> refusing to use the technology will leave those that *could* benefit
> from it at a severe disadvantage. (That said, GPUs aren't good at
> everything, and CPUs are also here to stay.)
> 
> And GPU performance gains are outpacing CPU performance gains -- I've
> seen about two orders of magnitude improvement in computational
> throughput over the past 6 years through the introduction of GPU
> computing and improvements in GPU hardware.
> 
> All the best,
> Jason

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Thread

Parallelization of Python on GPU? John Ladasky <john_ladasky@sbcglobal.net> - 2015-02-25 18:35 -0800
  Re: Parallelization of Python on GPU? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-26 14:02 +1100
    Re: Parallelization of Python on GPU? John Ladasky <john_ladasky@sbcglobal.net> - 2015-02-25 20:01 -0800
    Re: Parallelization of Python on GPU? Jason Swails <jason.swails@gmail.com> - 2015-02-26 10:06 -0500
    Re: Parallelization of Python on GPU? Sturla Molden <sturla.molden@gmail.com> - 2015-02-26 16:53 +0000
    Re: Parallelization of Python on GPU? Terry Reedy <tjreedy@udel.edu> - 2015-02-26 12:16 -0500
    Re: Parallelization of Python on GPU? Jason Swails <jason.swails@gmail.com> - 2015-02-26 12:48 -0500
    Re: Parallelization of Python on GPU? Sturla Molden <sturla.molden@gmail.com> - 2015-02-26 22:10 +0100
    Re: Parallelization of Python on GPU? Jason Swails <jason.swails@gmail.com> - 2015-02-26 17:28 -0500
  Re: Parallelization of Python on GPU? Ethan Furman <ethan@stoneleaf.us> - 2015-02-25 19:03 -0800
  Re: Parallelization of Python on GPU? Ethan Furman <ethan@stoneleaf.us> - 2015-02-25 19:05 -0800
    Re: Parallelization of Python on GPU? John Ladasky <john_ladasky@sbcglobal.net> - 2015-02-25 21:53 -0800
      Re: Parallelization of Python on GPU? Christian Gollwitzer <auriocus@gmx.de> - 2015-02-27 19:55 +0100
  Re: Parallelization of Python on GPU? Jason Swails <jason.swails@gmail.com> - 2015-02-26 10:27 -0500
  Re: Parallelization of Python on GPU? Sturla Molden <sturla.molden@gmail.com> - 2015-02-26 16:40 +0000
    Re: Parallelization of Python on GPU? John Ladasky <john_ladasky@sbcglobal.net> - 2015-02-26 09:34 -0800
      Re: Parallelization of Python on GPU? Sturla Molden <sturla.molden@gmail.com> - 2015-02-26 21:54 +0100

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