Hi Peter,
I've recently upgraded my Windows 2000 Professional system from a
> Pentium 3-500MHz with 512MB of RAM
to
> Pentium 4-1.5GHz with 1.5GB of RAM
and noticed that interpolation of larger images has slowed drastically. I have tried upgrading to the latest version (v2.31), to no avail - interpolation under the supposedly slower system was smooth and faster.
Under the Pentium 4 system, PMView interpolates larger images in a choppy manner, and is at least a magnitude slower to complete the render.
Any ideas?
Thanks,
- Wade
This sounds very strange. I'd say that there might be something odd with your L1/L2 cache settings. What cache size did your Pentium III have? How about the P4?
Or is this maybe just a display driver issue? Is the rendering choppy also when you disable interpolation?
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Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
[This message has been edited by Peter (edited December 08, 2001).]
Hi Peter - the rendering is fast with interpolation DISABLED. It's only when I turn it on again, that I see the images rendered to the screen in sections (i.e., not smooth progression), and much slower than on my prior Pentium 3, 500MHz.
- wader
BTW, not sure if this was clear, but rendering with Interpolation enabled is fast when the image size is less than the display size. The drastic slowdown occurs only when a larger image than 1024x768 is being resized for the screen. Again, the speed is vastly slower than under a P3 with otherwise same hardware and software.
Hope that helps.
- wader
This sounds very strange. The only explanation I have is that there is something wrong with the cache management (i.e. an operating system or hardware thing).
------------------
Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
Maybe, though I haven't noticed such problems for anything else yet . Any diagnostics in PMView I can try?
I assume that I'm the only one to report this with a P4 processor - mine is using the Asus P4B mainboard, which uses an Intel 845 chipset, and PC133 SDRAM. DirectX 8.1. Not sure if the libraries you use are at all looking for anything special.
- wader
Peter, I tried some graphics benchmark tests and check the cache settings: everything seems normal outside of PMView, from what I can glean. Cache is 20 for L1 and 256 for L2, btw.
- wader
Are you sure that you're not running in 256 color mode? (Interpolation is much slower in 256 color mode since a nearest color search must be done for each pixel).
Check that you're using a video mode with deep color (15 bits or more).
Let's hope this is it. At least this would explain why it is significantly slower
------------------
Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
[This message has been edited by Peter (edited December 21, 2001).]
Peter,
Would you recommend any types of tests I could run to attempt locating the cause of this problem?
Thanks,
- wader
Try a 1600x1200 GIF and a 1600x1200 color JPEG.
Do you notice a remarkable difference in speed?
------------------
Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
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