On Fri, 18 Nov 2011 07:24:32 +0000, "Boswell, Dan - GT&O JPN-MLJS" <daniel.d.bosw...@baml.com> wrote: > Hi all, > > There's a bug in python (http://bugs.python.org/issue3905) that affects > PyTools when PyCUDA creates a subprocess to run nvcc. Fortunately this is > only the case for Windows machines, and specifically when PyCUDA is run in a > UI application (shell) which itself is run from the console; something that's > probably not very common. Unfortunately for me, that is _exactly_ the > scenario for the IDE/shell that we use where I work (Windows XP, Python > 2.6.5). > > Although the python bug remains open, there's a simple workaround which > involves passing subprocess.PIPE as the argument to _all_ the std* keywords > when using subprocess.Popen in prefork.py. I've attached a patch, but let me > know if this is not the correct forum to do so, or if there's an alternative > process (e.g. a git pull request). > > > One simple way of reproducing this is to use IDLE: > > 1. From the Windows console run 'pythonw idlelib\idle.pyw -n', then in IDLE: > > >>> # This fails > >>> from subprocess import Popen, PIPE > >>> Popen(['nvcc', '--version'], stdout=PIPE) > > >>> # This works > >>> Popen(['nvcc', '--version'], stdin=PIPE, stdout=PIPE, stderr=PIPE) > > 2. Or run hello_gpu.py in that IDLE window > > And you should get an error like the following > > [...] > File "C:\home\dbo\argh\ext\win32_vc9\lib\python2.6\subprocess.py", line > 773, in _make_inheritable > DUPLICATE_SAME_ACCESS) > WindowsError: [Error 6] The handle is invalid > > > Hope that helps, and it would be good to get this into the official > PyTools repo/distribution so that we don't have to maintain a patched > version here! :)
Done. I've also uploaded 2011.5 with the patch on board, to make your life easier. Andreas
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