Application development for the Cell processor
Before you can launch the Cell Full System Simulator, you must store the path to the simulator in the SYSTEMSIM_TOP environmental variable, which is /opt/ibm/systemsim-cell by default.
The following command wakes up the simulator:
The -g option launches a Tcl/Tk-based graphical interface (Figure 6). To see the various modes the simulator offers, press the Mode button. For a simple function test, Fast Mode is probably your best choice. Clicking Go launches the simulator. Now the console window will show you the operating system booting on the simulated Cell machine.
To load the program you want to run on the simulator, use the callthru command. If you run the command without any parameters, it will just show a help text. To import an executable file stored in the path /tmp/pi_libspe on the physical machine, use the command:
callthru source /tmp/pi_libspe > pi_libspe
After modifying the permissions, as in chmod u+x pi_libspe, you can then finally launch the program:
./pi_libspe 1000000 8
Running the program tells the simulation machine to create a million pairs of random numbers using eight SPEs. The precision with which the result matches the accepted value of PI depends on the quality of the pseudo-random numbers, but also on the number of attempts. The statistical error is approximately identical to the reciprocal value of the square root of the number of attempts. Given one-million attempts, the deviation between the approximated value and the actual value of PI is about one thousandth, that is, about 0.003.
Another programming tool is the Data Communication and Synchronization (DaCS) library. Dacs abstracts a number of the Cell processor's special features, which means that it potentially could be ported to other accelerator architectures. In contrast to this, the Accelerator Library Framework (ALF) implements a programming model that swaps out individual functions to the SPEs. DaCS and ALF are included in the IBM developer environment.
The Multicore Application Runtime System (Mars) is an open source project spearheaded by Sony . Mars installs miniature kernels on the SPEs, and the kernels autonomously manage the execution of programs on "their" SPEs. Released in November 2008, version 1.0.1 is available as either an RPM package or Tar archive.
- Top 500: http://www.top500.org
- Green 500: http://www.green500.org
- Cell SDK: http://www.ibm.com/developerworks/power/cell
- Cell system simulator: http://www.alphaworks.ibm.com/tech/cellsystemsim
- Barcelona Supercomputer Center: http://www.bsc.es
- Linux on the PS 3: http://en.wikipedia.org/wiki/Linux_for_PlayStation_3
- Mars software and documentation: ftp://ftp.infradead.org/pub/Sony-PS3/mars
Buy this article as PDF
Mozilla’s script blocker add-on could be putting malware sites on the whitelist.
The Internet community officially banishes the notoriously unsafe Secure Sockets Layer protocol.
Popular desktop environment continues the Gnome 2 legacy – with new support for the Gnome 3 toolkit.
The Obama White House has issued a memorandum telling all US government agencies they must use HTTPS for all websites and web communication.
New program will dial up security for the Firefox browser.
Red Hat's community distro embraces the cloud.
New partnership will bring more and better CS training to US schools
Criminals offer online help over Tor network
Sophisticated malware is still present on Joomla and WordPress sites around the world.
Future versions of Ubuntu's code service will support the popular Git version control system used with Linux and other open source projects.