My system is an Intel core i5 laptop, no GPU. It's running Fedora (the most recent one, I've never been able to find version numbers), and I'm using the Intel OpenCL implementation (version 1.5) for 64-bit Linux. My PyOpenCL version is 2011.2 . Python is 2.7.2
In getting started for OpenCL development, I started writing a kernel. That kernel did not ever halt. I've pared down the arguments to the bare minimum -- if I remove one of those arguments, then the kernel halts. That behavior is confusing and alarming. The arguments aren't _used_, but as long as they are part of the function signature they cause the OpenCL kernel to work forever rather than halting. Furthermore, top reports 350+% CPU usage, so it's not blocking or anything -- it's busy working. If my NDRange only has one work-item, then I get about 100% CPU usage. So even just a single kernel instance takes forever. In an effort to rule out PyOpenCL problems, I managed to rule them in: a C port of the Python program, with the same kernel, did not take forever to execute. It's not an exact copy, and I don't really know what I'm doing, so if there are different semantics please point them out, as they could also explain differing behavior. Here is a link to the Python and C code that reproduces and doesn't reproduce this problem, respectively: http://bpaste.net/show/X8Gcr5b2mL3QcgwABdqY/ If you can offer any help or advice, it'd be much appreciated. -- Devin P.S. I asked a question on Stack Overflow some time ago, but I now have reason to believe it's specifically a PyOpenCL problem rather than OpenCL in general, so I figured I'd post here. If you want to see the original, it is here: http://stackoverflow.com/questions/10306669/opencl-kernel-hangs-forever-unless-i-remove-parameters It has had no responses, but this is a cross-post so I figured I'd let you know. _______________________________________________ PyOpenCL mailing list [email protected] http://lists.tiker.net/listinfo/pyopencl
