= Setting up openCL =

I am still developing the procedure that follows.  I don't have openCL working yet.

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I will use openCL to do radio array computations faster.

I am running Scientific Linux on a Scientific Linux 6.2 system  (2.6.32 kernel), Intel P4 3GHz 2CPU 12000 bogomips.
My graphics card is an nVidia G92 9800GTX (112 CUDA cores, 512MB RAM, PCIEx16 gen1).  This drives a 20 inch Viewsonic 1400x1050 display.

See https://developer.nvidia.com/opencl

=== Setting up the nVidia driver ===
 .0) back up /etc/r
 .1) download the NVIDIA driver installer from http://www.nvidia.com/object/linux-display-ia32-310.44-driver.html
 .2) Turn off the nouveau driver.
  . in /etc/grub.conf, add rdblacklist=nouveau to the end of each "kernel" line
 .3) reboot to single user, telinit 3
 .4) run the NVIDIA driver installer.  Among other things, this will add /etc/modprobe.d/nvidia-installer-disable-nouveau.conf

This adds a whole bunch of files and modules, including /etc/OpenCL with an nVidia vendor file.

The installed driver is 310.44, NV-Control Version 1.28

Note - I did this before setting up the SDK.  The SDK may also have the driver!

=== Setting up the SDK ===

 . also see http://docs.nvidia.com/cuda/cuda-getting-started-guide-for-linux/index.html

 . download CUDA from https://developer.nvidia.com/cuda-downloads
 . Yikes! there is no entry for RHEL6 32 bit!  Let's try RHEL5 32 bit.
  . Click that button, download the 570MB   cuda_5.0.35_linux_32_rhel5.x-1.run
  . run that as root
 . modify the PATH to include /usr/local/cuda-5.0/bin .  I put this in /etc/profiles.d/cuda.sh:
  . PATH=/usr/local/cuda-5.0/bin:${PATH}
  . export PATH
 . I put this in /etc/ld.so.conf.d/cuda.conf:
  . /usr/local/cuda-5.0/lib
 . then ran ldconfig as root

 . /usr/bin/nvidia-settings . . . nvcc -V . . .

=== More setup to prepare for samples ===

 . yum install freeglut
 . ln -s /usr/lib/libglut.so.3 /usr/lib/libglut.so
 . yum install openmpi openmpi-devel
 . ln -s /usr/lib/openmpi/bin/mpicxx /usr/local/bin/mpicxx
 . yum install libXmu-devel

=== samples ===
 . sh cuda*run -silent -driver -samples
 . cd /usr/local/cuda-5.0/samples . . . . make
 . in /usr/local/cuda-5.0/samples/bin/linux/release:
  . smokeParticles
  . randomFog

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Comparison of nVidia cards:

|| Card       || 9800 GT || GTX 570 || Titan   ||
|| Release    || 2008/07 || 2010/12 || 2013/02 ||
|| Tech       ||  65nm   ||  40nm   ||   28nm  ||
|| Core Clock || 600MHz  || 732MHz  ||  836MHz ||
|| Power      || 125W    ||  219W   ||   250W  ||
|| RAM        || 512M    || 1280M   ||  6144M  ||
|| GFlop      || 504     || 1405    ||  4500   ||
|| Cores      || 112     ||   480   ||  2688   ||
|| OpenCL     ||   1.1   ||     1.1 ||     1.2 ||
|| Rel. Price ||         ||    $349 ||  $1000  ||