>
>
> Hi,
>
> Short:
> Does anyone know offhand of pitfalls trying to make system calls through pipes
> via FFI from Squeak on Linux (Ubuntu 14.04 on ARM if it makes a difference)?
>
> Long:
> I¹ve been having fun playing with the Parallella board [1]. The Parallella
> board has a Xilinx dual-core ARMv7 with a small FPGA, and an Epiphany
> coprocessor which has 16 RISC cores.
>
> I managed to get a CogStackVM running on (one of the) ARM cores. Based on
> Tim¹s CogStackVM for the RPi (ARMv6), I made some hacks to get it working on
> the BeagleBoneBlack (ARMv7). This ARMv7 version was compiled on a Chromebook
> by Ken Dickey where it magically worked, and now by me on the Parallella where
> it also ³just works².
>
> So I wanted to see if I could fire up any of the Epiphany cores. I loaded
> Squeak OpenCL FFI bindings [2] (very cool) and have been able to do some very
> simple things such as query the Epiphany capabilities, and create Epiphany
> buffers and write/read them. So far so good.
>
> If you want to induce any of the Epiphany¹s cores to do some actual work, you
> have to provide some code (kernel in OpenCL-speak). These can be compiled and
> loaded on the fly by an OpenCL library API. This is where I am stuck.
>
> The OpenCL library for the Parallella is open source so I can see exactly
> where things go wrong. When the kernel compile API is called, it performs its
> work by making a bunch of system calls via popen(<cmd>, ³r²). None of these
> works; both Squeak and the command are deadlocked once the first popen() call
> is made. I rebuilt the OpenCL library from sources with debug enabled, as well
> as added some additional debug prints.
>
> In order to communicate with the Epiphany, processes need to be run as root,
> thus I am running Squeak as root for these tests. And since Squeak is running
> as root I don¹t suspect permission problems getting access to commands and
> files.
>
> The OpenCL library for Parallella compiles kernels successfully for test
> programs written in C, so /it/ should be ok. And the Squeak OpenCL bindings
> seem to work fine (insofar as I have played with them; that alone is a lot of
> fun :)) on a Mac with GPU.
>
> I know the question is vague, and I¹m sure I haven¹t provided nearly enough
> info, but thought I would throw it out there :)
>
> Thanks!
> Doug
>
> [1]
http://www.parallella.org <
http://www.parallella.org/>
> [2]
https://sites.google.com/site/schwaj/home/opencl-binding-for-squeak>
>
> ------ End of Forwarded Message
Locked
