Re: [Gems-users] Problem with Simics segmentation fault

[Mike Marty <mikem@xxxxxxxxxxx>]

The USER_MODE_DATA_ONLY appears to be a flag for LogTM only. 

I would try to identify what exact parameter causes the segmentation 
fault.  I wouldn't be surprised if it is the size of the data block 
(since we haven't done much testing in using sizes other than 64). 

--Mike


Liz Mooney wrote:
> Sorry..here is the line from rubyconfig.defaults that I changed to get ruby to run in user mode:
>
> USER_MODE_DATA_ONLY: false //I changed this to true
>
> L2_CACHE_NUM_SETS_BITS: 10 //changed this too
> g_DATA_BLOCK_BYTES: 256    //and this but these are probably unrelated
>
> We also changed the SLICC interface file MOSI_SMP_directory_1level-cache.sm to add certain functionality. But this should not make a difference because it has been running fine in previous simulations with and without the user mode set.  
>
> Thanks,
> Liz
>
> ---- Original message ----
>   
> > Date: Fri, 04 May 2007 20:47:16 -0500
> > From: Dan Gibson <degibson@xxxxxxxx>  
> > Subject: Re: [Gems-users] Problem with Simics segmentation fault  
> > To: Gems Users <gems-users@xxxxxxxxxxx>
> > I don't understand what you mean by "change(ing) the user mode". What 
> > specific parameters did you change in rubyconfig.defaults?
> > Also, have you made other changes to the Ruby codebase?
> >
> > Regards,
> > Dan
> >
> > Liz Mooney wrote:
> >
> >     
> > > Hello,
> > >
> > > I have been compiling and running Ruby on several different benchmarks just fine until this morning.  I wanted to change the user mode in /ruby/config in the rubyconfig.defaults and when I did this, recompiled Ruby, and tried loading it into Simics I got the following error after I tried typing something (like ls or pushing enter) in the Simics console:
> > >
> > > simics> c
> > > Segmentation fault (SIGSEGV) in main thread
> > > The simulation state has been corrupted. Simulation cannot continue.
> > > Please restart Simics.
> > >
> > > This seems strange to me because I have been changing cache size, block size, and user mode in the configuration file in the past and it worked just fine. Nothing has changed since last night when I last ran a simulation. 
> > >
> > > I am loading Ruby to Simics correctly since I have checked this. Any help would be appreciated. 
> > >
> > > Thanks,
> > > Liz
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> > >
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