[TriLUG] Questions about Threading
M. Mueller at Signalnetware.com
mmueller at signalnetware.com
Tue Mar 26 12:55:36 EST 2002
On Tuesday 26 March 2002 12:08 pm, you wrote:
> I'm not a programmer, but I am curious about threading and the advantage
> to having a multi-processor linux box (I guess running an smp kernel).
> Do programs have to be written to take advantage of a dual-processor, or
> will cycles be distributed evenly during a process? How do you know if
> your program will support multiple processors?
The kernel can use multiple processors to run more than one single threaded
A program can be composed of:
mutiple single || multiple
Programs that are multi-process, multi-threaded might run faster in a
multi-processor environment. A programmer could write a multi-process,
multi-thread operation that passes a semephore that allows execution only
with possesion of the semaphore, thus rendering multi-processors to be of
less value to such an application.
In general, it pays to understand the kernel scheduling function and design a
program to take advantage of that algorithm.
Running a web server with multiple processes could probably be improved using
a multiple processor server.
My application would be helped significantly by having multiple processors,
one for each of 5 daemons that run in parallel and perform independent tasks
and use IPC to talk to each other. In this case, the vendor tells you
outrightly that the multiple processor machine will improve performance.
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