Re: [PyCUDA] test_gpuarray.py errors

Imran Haque Sun, 25 Apr 2010 11:38:43 -0700

Hi Chethan,

Devices of compute capability 1.3 do support double. 1.2 and lower do not.


Imran

Chethan Pandarinath wrote:

Hi Bryan, thanks for the quick reply. I understand the issue now.

So it looks like any devices of compute capability 1.x would not havesupport for double precision (from section 5.1.1.1 of the NVIDIA CUDAProgramming Guide).

Does this seem like a reasonable way of checking for double precisionsupport in the test script? e.g., :


import pycuda.driver as cuda
dev=cuda.Device(0);
if dev.compute_capability() < (2,0):
   no double precision support, don't run those tests...

On Fri, Apr 23, 2010 at 9:07 PM, Bryan Catanzaro<bryan.catanz...@gmail.com <mailto:bryan.catanz...@gmail.com>> wrote:


    The GPU in your MacBook doesn't support double precision, which is

why these tests are failing.You're of course welcome to change the tests so that they check for

    double precision support before running them - that would probably
    help out others who end up in this situation.

    - bryan

    On Apr 23, 2010, at 5:41 PM, Chethan Pandarinath
    <chethan.pandarin...@gmail.com
    <mailto:chethan.pandarin...@gmail.com>> wrote:

    Hi everybody,

    I've been working on installing PyCUDA on my MacBook (Snow
    Leopard).  I think I'm close to having it working, it's been quite
    a long road: getting compatible versions of boost, setuptools,
    pytools... anyway, I think I'm past all that.

    I can now successfully run test_math.py and test_driver.py with no
    errors.

    I am having trouble, however, with test_gpuarray.py

    I'm attaching the output from running the test script, with the
    standard error appended as well.
       $ arch -i386 python test_gpuarray.py >test_gpuarray_output.txt


    There are a couple types of errors that I can see here:

    E               AssertionError: (array(-4.2129004090721698e+36),
    -1.2509687918788644e+303, <type 'numpy.float64'>, 'min')
    test_gpuarray.py:328: AssertionError

    E           assert array(-6.0786212321272663e+144) ==
    -2.6357594520767543e+301
    test_gpuarray.py:357: AssertionError

    E           LaunchError: cuCtxPopCurrent failed: launch failed
    /Library/Python/2.6/site-packages/pycuda/tools.py:504: LaunchError

    E           RuntimeError: make_default_context() wasn't able to
    create a context on any of the 1 detected devices
    /Library/Python/2.6/site-packages/pycuda/tools.py:216: RuntimeError


    To tell you the truth I don't know how to begin debugging this. If
    anyone can point me in the right direction, I'd greatly appreciate
    it. Willing to provide any info that would help...

    I'm running this on a MacBook, Snow Leopard (10.6.3), with an
    NVIDIA GeForce 9400M. Using Python 2.6.1.

    Thanks.
    Chethan

--Chethan Pandarinath

    <mailto:chethan.pandarin...@gmail.com>chethan.pandarin...@gmail.com
    <mailto:chethan.pandarin...@gmail.com>
    <test_gpuarray_output.txt>
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--
Chethan Pandarinath
chethan.pandarin...@gmail.com <mailto:chethan.pandarin...@gmail.com>


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Re: [PyCUDA] test_gpuarray.py errors

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