Re: [Valgrind-developers] multiple passes over application

[Ayodele T. <em...@st...>]

I tried running the same skin twice on the same executable (with no 
changes), and even that gave different results for the data memory 
addresses.  I will have to figure out another way to reduce my memory 
requirements - maybe dumping state to a file occasionally and then only 
reading it back when needed.

Ayo

> 
> On Wed, 7 Jan 2004, Ayodele Thomas wrote:
> 
> > My initial step is designed to identify data addresses that are read only
> > so that they can be excluded from the main analysis performed by the
> > second step. Therefore, the second step is the critical step and must be
> > performed in Valgrind.    I can't think of a way that both steps can be
> > performed at the same time because the goal is to determine which data can
> > be ignored - but that cannot be determined until the entire application
> > has run because I am locating dependencies.
> 
> So you can't tell which addresses are read only until the program has
> finished?  Ok, I think I understand.
> 
> > The initial step is designed to reduce the memory requirements because I must
> > keep track of a tremendous amount of state in the main pass and have
> > issues running out of memory and crashing, even with the 2GB of memory on
> > my machine.
> 
> What about if you put both passes into the same skin, and then switch
> between the pre-processing and main processing with a command-line arg?
> That way, you will hopefully get the same memory addresses for both runs.
> However, even if it does work, it sounds fragile.
> 
> N
> 


-- 
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Ayodele Bolaji Thomas  			"Joy in the Morning"                

Ph.D. Candidate Electrical Engineering 	
Computer Systems Laboratory 		
Stanford University
Ayo...@st...


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