Re: [Gems-users] Start Ruby after the simulation is running?

[Dan Gibson <degibson@xxxxxxxx>]

GEMS can simulate just about anything, but it is often of little 
research interest to simulate certain system-level events. That is, the 
timing of these events is not usually relevant.
Xuan Qi wrote:
> 4) Be careful to only simulate the important regions of code -- do not
>
>    include thread creation / destruction, process forking, etc.
>
>    BTW, does this mean GEMS can't simulate multiprogramed or multithreaded
>    programs? Thanks!
>
>    Best regards,
>    Xuan Qi
>
> On Mon, 3 Mar 2008, Dan Gibson wrote:
>
>   
> > Have a look at the various headers that come in the LogTM codebase, in
> > transactions/common/ (GEMS 2.0+) in particular. There should be some
> > handy macros there intended for this purpose.
> >
> > Regards,
> > Dan
> >
> > Philip Garcia wrote:
> >       Look in the simics reference manual about using the special
> >       magic instructions.  Using magic breakpoints in the code
> >       (combined with having set magic-break-enable before running
> >       the code) will have simics stop execution at that
> >       instruction.  Just make sure you do a "c 1" after the magic
> >       instruction before saving the processor's state.  If you
> >       don't do this, the state will be saved at the magic
> >       instruction, and telling it to execute again will just cause
> >       it to break again.
> > Phil
> > On Mar 3, 2008, at 1:13 AM, Jim Leek wrote:
> >
> >       The wiki FAQ
> >       (http://www.cs.wisc.edu/gems/doc/wiki/moin.cgi/Frequently_Asked_Questions)
> >       recommends the following:
> >
> >  4) Be careful to only simulate the important regions of code -- do not
> >
> > include thread creation / destruction, process forking, etc.
> >
> >       That sounds like a good idea.  What is the standard way
> >       to do this?  It seems like you would have to throw an
> >       instruction into the benchmark code to halt the
> >       simulation and drop back to the simics CLI.  Is there
> >       an instruction to do this?  I guess I could use
> >       getchar() to do that.  What did the logTM guys do?
> >
> >       Jim
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