Standard Compute Layer Library

​http://www.browndeertechnology.com/stdcl.html

A wrapper library API for OpenCL API used in the tutorial below. It seems that the libstdcl greatly simplify a sample program ($OPENCLDIR/samples/opencl/cl/app/NBody) supplied with Stream SDK 2.0beta.

OpenCL Tutorial: N-Body Simulation

​http://www.browndeertechnology.com/docs/BDT_OpenCL_Tutorial_NBody.html

A tutorial that modifies the sample NBody program written in OpenCL API.

local & global

​http://forums.amd.com/devforum/messageview.cfm?catid=390&threadid=123350&enterthread=y

It's a tricky question . On 4xxx __local mem is really __global mem ( ATI thinks it's too much work to optimize compiler to use 48xx  LDS - although it's possible ). 
On 5xxx __local is LDS - so it's located in simd core.

Catalyst 10.1 with Ubuntu 9.10 workarounds

Change the grub setting

Edit "/etc/default/grub" and execute update-grub. I add "nopat" to GRUB_CMDLINE_LINUX_DEFAULT for Catalyst 10.1.

The configuration file for the grub is at /boot/grub/grub.cfg. This file is automatically generated by update-grub command.

X server setting

The default login manager gdm is difficult to properly configure, I install xdm instead of gdm. The configuration file for xdm is at /etc/X11/xdm directory.

Edit "Xservers" file as

:0 local /usr/bin/X :0 vt7 -nolisten tcp -ac

This "-ac" option enable remote applications to access the local X server.