* memory used by btt
@ 2007-03-26 15:23 Ming Zhang
2007-03-26 16:17 ` Alan D. Brunelle
2007-03-27 1:20 ` Ming Zhang
0 siblings, 2 replies; 3+ messages in thread
From: Ming Zhang @ 2007-03-26 15:23 UTC (permalink / raw)
To: linux-btrace
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?
ps, why we always need double in the code, can float fit the bill as
well?
Ming
--
Ming Zhang <mzhang AT ibrix.com>
www.ibrix.com
978-670-7400 x 145
http://blackmagic02881.wordpress.com/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: memory used by btt
2007-03-26 15:23 memory used by btt Ming Zhang
@ 2007-03-26 16:17 ` Alan D. Brunelle
2007-03-27 1:20 ` Ming Zhang
1 sibling, 0 replies; 3+ messages in thread
From: Alan D. Brunelle @ 2007-03-26 16:17 UTC (permalink / raw)
To: linux-btrace
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.
Alan
> Ming
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: memory used by btt
2007-03-26 15:23 memory used by btt Ming Zhang
2007-03-26 16:17 ` Alan D. Brunelle
@ 2007-03-27 1:20 ` Ming Zhang
1 sibling, 0 replies; 3+ messages in thread
From: Ming Zhang @ 2007-03-27 1:20 UTC (permalink / raw)
To: linux-btrace
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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^ permalink raw reply [flat|nested] 3+ messages in thread
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2007-03-26 16:17 ` Alan D. Brunelle
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