Re: memory used by btt

[Ming Zhang <blackmagic02881@gmail.com>]

On Mon, 2007-03-26 at 12:17 -0400, Alan D. Brunelle wrote:
> Ming Zhang wrote:
> > Hi 
> >
> > I am now using btt to analyze a 700MB trace data and it always run oom
> > in my 2GB ram laptop. it also eat 2GB swap as well. Any idea why btt
> > need so many memory?
> >   
> 
> Well, BTT builds trees based upon outstanding IO traces. That could 
> indicate that BTT is having a hard time dealing with your data - I find 
> that sometimes the kernel does weird things, causing strange IO trees 
> being built that BTT can't put back together. I've got some multi-GB 
> sized binary files that I've handled, let me see what the memory 
> footprint is for those...
> 
> 
> > ps, why we always need double in the code, can float fit the bill as
> > well?
> >   
> 
> Probably could, but I'm not too sure about some of the conversions done 
> with LBAs. I can look into that if need be.

i did a quick check, changing to float will not have much help on that
footprint. double is not used in some key data structures.

> 
> Alan
> 
> > Ming
> >
> >   
> 
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