Great, thanks very much Andreas! Dan
-----Original Message----- From: Andreas Kloeckner [mailto:li...@buster.tiker.net] Sent: Friday, November 18, 2011 6:57 PM To: Boswell, Dan - GT&O JPN-MLJS; PyCUDA@tiker.net Subject: Re: [PyCUDA] Python bug affecting PyTools/PyCUDA on Windows - invalid handle when piping stdout from subprocess 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 ---------------------------------------------------------------------- This message w/attachments (message) is intended solely for the use of the intended recipient(s) and may contain information that is privileged, confidential or proprietary. If you are not an intended recipient, please notify the sender, and then please delete and destroy all copies and attachments, and be advised that any review or dissemination of, or the taking of any action in reliance on, the information contained in or attached to this message is prohibited. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Sender. Subject to applicable law, Sender may intercept, monitor, review and retain e-communications (EC) traveling through its networks/systems and may produce any such EC to regulators, law enforcement, in litigation and as required by law. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or free of errors or viruses. References to "Sender" are references to any subsidiary of Bank of America Corporation. Securities and Insurance Products: * Are Not FDIC Insured * Are Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are Not a Condition to Any Banking Service or Activity * Are Not Insured by Any Federal Government Agency. Attachments that are part of this EC may have additional important disclosures and disclaimers, which you should read. This message is subject to terms available at the following link: http://www.bankofamerica.com/emaildisclaimer. By messaging with Sender you consent to the foregoing. _______________________________________________ PyCUDA mailing list PyCUDA@tiker.net http://lists.tiker.net/listinfo/pycuda
