current VM performance

current VM performance

[Rik van Riel]

Hi,

While considering future VM improvements, I decided to do
some tests with the current VM subsystem.

I started with a 512x512 image (background of www.zip.com.au)
in GIMP. The first thing I did was increasing the image size
to 5120x5120, now I am 120M in swap on my 24M machine :-)

The resizing goes reasonably fast, a good indication that
swapOUT I/O clustering works. Zooming out to 16:0 (so that
I could view the entire image in one time) was hell though.
That was to be expected since we don't do swapIN clustering
yet...

Now the system is running the 'NL' enhancement filter, it's
happily churning away at 100 swapins a second, 50 swapouts
and 'some' filesystem activity... Gimp and the filter both
get around 25% CPU and x11amp doesn't skip a beat :-)

This looks quite acceptable to me, and together with swapin
readahead (yup, it's on it's way) even my 24M system should
rock again...

Rik.
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Re: current VM performance

[Andi Kleen]

Rik van Riel <H.H.vanRiel@phys.uu.nl> writes:

> Hi,
> 
> While considering future VM improvements, I decided to do
> some tests with the current VM subsystem.
> 
> I started with a 512x512 image (background of www.zip.com.au)
> in GIMP. The first thing I did was increasing the image size
> to 5120x5120, now I am 120M in swap on my 24M machine :-)

I'm not sure if the gimp is a good vm tester, because it basically
does its own VM with its tile based memory architecture. 

-Andi 
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Re: current VM performance

[Alex Buell]

On Sun, 5 Jul 1998, Rik van Riel wrote:

> This looks quite acceptable to me, and together with swapin
> readahead (yup, it's on it's way) even my 24M system should
> rock again...

Yay! Then I can get acceptable performance out of Netscape!

Cheers,
Alex
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Re: current VM performance

[Rik van Riel]

On 5 Jul 1998, Andi Kleen wrote:
> Rik van Riel <H.H.vanRiel@phys.uu.nl> writes:
> 
> > I started with a 512x512 image (background of www.zip.com.au)
> > in GIMP. The first thing I did was increasing the image size
> > to 5120x5120, now I am 120M in swap on my 24M machine :-)
> 
> I'm not sure if the gimp is a good vm tester, because it basically
> does its own VM with its tile based memory architecture. 

With some changes to /usr/share/gimp/gimprc it is...
Let it grow to 100MB of memory and use cubic interpolation
instead of linear....

Besides, I don't have room anymore for the gimp's own
swap file :)

Rik.
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| Linux memory management tour guide.        H.H.vanRiel@phys.uu.nl |
| Scouting Vries cubscout leader.      http://www.phys.uu.nl/~riel/ |
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