to increase the speed

summit · 05-24-2012, 07:06 AM

Hi LinuxExperts,

I am using Scientific linux. I am using simulation toolkit Geant4. For this, I am using terminal to run and compile the program (GCC). I have core i5 processor. For running the program, how can I use all the four cores for it so that I can increase the speed???

Please suggest me.

Thanks in advance,
Summit

TobiSGD · 05-24-2012, 07:09 AM

You have to make your program to make use of multi-threading. There is no automagic way to do that, your program has to be written in that way.

summit · 05-24-2012, 07:13 AM

Hi

Thanks for reply

Can you tell me how can I make the program to use multi-threading?
any idea pls?

---------- Post added 05-24-12 at 05:44 PM ----------

or it have to do during make as make -j4 or something else???

TobiSGD · 05-24-2012, 07:23 AM

make -j4 will only speed up the compiling, not the program itself.
As I can see it Geant4 uses C++, so you have to learn how to do proper multithreading in C++ and in which way you can use that knowledge with the Geant4 framework. Since I neither program in C++ nor know much about Geant4 I can't help you with that.

whizje · 05-24-2012, 07:29 AM

If you want the program to make use of your four cores you need Geant4-MT. The make -j4 option is only to speed up the compilation (creation) time of the program. And that is a one time proces. Until there is a new version of course and you want to use the new functions or get rid of a annoying bug, then you have to compile the new program ones.

chrism01 · 05-24-2012, 08:22 PM

Quote:

Can you tell me how can I make the program to use multi-threading?

See the advice above and I'd also recommend asking the Mods (via the Report button) to move this to the Programming forum.