[CoLoCo] How do I make a program fully utilize my dual-core processor?

[Ryan Maki]

Additionally, serious password cracking software might also be able to
utilize your graphics card, depending on make and model.~Ryan

On Mon, Oct 5, 2009 at 4:30 PM, Neal McBurnett <neal at bcn.boulder.co.us>wrote:

> I'd be surprised if good cracking applications didn't already have an
> option to do multi-threading to use all your cores.  What software are
> you using?
>
> -Neal
>
> On Sat, Oct 03, 2009 at 06:51:37PM -0400, Ringo wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
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> > Thanks for all of the great responses! Looks like for now I'll be
> > sticking to just one core for cracking. Recovering this password
> > unfortunately isn't enough of a justification for me to go in and hack
> > the source.
> >
> > Ringo
> >
> > NICK VERBECK wrote:
> > > If you wrote the program yourself or have access to the source. You
> > > could extend it to use Threads. However with threads you can truly
> > > only fire-up as many threads as you have cores. Each thread will use a
> > > separate core to run in, but once you get 2 threads in the same core
> > > you will start context switching between each thread in that core
> > > slowing down the actual speed of those 2 threads.
> > >
> > > On Sat, Oct 3, 2009 at 8:31 AM, Neal McBurnett <neal at bcn.boulder.co.us>
> wrote:
> > >> In general, the problem you identify is one of the most daunting
> > >> issues facing computer science.  It is getting much harder to speed up
> > >> individual processors, so the way to give people more power is to give
> > >> them more cores.  But we often can't find a suitable way to take
> > >> advantage of them to solve a given problem....
> > >>
> > >>  http://en.wikipedia.org/wiki/Parallel_computing
> > >>
> > >> It all depends on exactly what you want to do.  You are in luck
> > >> because recovering a password is easily done in parallel, as James
> > >> notes.  But many other interesting tasks can't be easily parallelized.
> > >>
> > >> Neal McBurnett                 http://neal.mcburnett.org/
> > >>
> > >> On Sat, Oct 03, 2009 at 07:35:00AM -0600, James Wyatt wrote:
> > >>> Assuming both instances can work on different hashes you could run
> your
> > >>> app twice and assign processor affinity to each process.
> > >>>
> > >>> http://www.linuxjournal.com/article/6799
> > >>>
> > >>>
> > >>> You could do something with erlang if you wanted to do it with style,
> > >>> but that would certainly be overkill.
> > >>>
> > >>> Jim
> > >>>
> > >>>
> > >>>
> > >>> On Sat, Oct 3, 2009 at 1:31 AM, Ringo <2600denver at gmail.com> wrote:
> > >>>
> > > Hey Ubuntu experts,
> > >
> > > I've got an intel dual-core processor which Ubuntu (intrepid) runs
> great
> > > on. It will fully utilize both cores if I've got lots of programs
> > > running but each program is confined to only one core.
> > >
> > > I've looked around online to find out how to make a program use both
> > > cores, but I can't find any advice on this outside of the convoluted
> > > process of running a program inside a virtual machine. I'm trying to
> > > recover a password from a hash and one core is at 100% while the other
> > > is around 3% usage.
> > >
> > > Any ideas?
> > >
> > > Thanks,
> > > Ringo
> > >
> > >>>
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