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Need for speed: What are the key fact...

The Panorama Factory Forum » The Panorama Factory FAQ » Need for speed: What are the key factors in hardware for speeding up the creation of the mosaic? « Previous Next »

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Chris Vastenhoud
Posted on Tuesday, June 12, 2001 - 5:59 am:   Edit PostDelete Post

In addition to the memory and swap-file issues adressed in this list, wht speeds up the process best?

A faster processor?
Is PF quicker on dual processor machines?
More memory? Minimum memory?
A powerfull video-card?
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John Strait
Posted on Friday, June 22, 2001 - 10:02 am:   Edit PostDelete Post

This subject has already been covered in detail in the FAQ Increasing Performance.

The short answers to your questions are:

A faster processor?
If you have enough RAM, a faster processor will certainly help. However, if you have insufficient RAM, a faster processor will make much less difference.

Is PF quicker on dual processor machines?
Not significantly. The Panorama Factory will only use one processor. It may halp slightly becuase other operating system tasks can use the other processor.

More memory? Minimum memory?
If you have inadequate memory, adding more RAM will make the most different in speed. The amount of memory you need depends on the size of your images. During stitching, watch the hard disk activity light on your computer and also watch the progress bar that tells what PF is doing. If the disk is active only when PF indicates it is reading or writing image files, you probably have enough memory.

A powerfull video-card?
This is unlikely to make very much difference.
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Brad Templeton
New member
Username: Bradtem

Post Number: 2
Registered: 9-2006
Posted on Thursday, November 15, 2007 - 6:01 pm:   Edit PostDelete Post

PFactory now says it supports multiple processors, so I presume this answer is out of date. (While I have a Core 2 Duo, I use wine so have not yet gotten the advantages of this.)

What has been parallelized? On a machine with good memory, what's the typical speedup from one core to two? How about with four?
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John Strait
Username: Jstrait

Post Number: 340
Registered: 5-2001
Posted on Friday, November 16, 2007 - 8:28 am:   Edit PostDelete Post

Yes, the part about dual processor machines is out of date.

Starting with V4.2, the m32 and x64 Editions support multiple processors. The Legacy Edition doesn't include support for multiple processors. Neither does the V5.0 Mac Edition, but this is planned for a subsequent V5.x release.

Most of the image processing operations (warp, align, blend, crop, resize, etc) take advantage of all processor cores. The user interface and file input/output use only a single processor.

In our testing (performed around the time of the V4.2 release), typical speed ups were:

2 processors: 1.8 X
3 processors: 2.6 X
4 processors: 3.0 X

Of course, speed is heavily influenced by many factors. The most significant is available RAM. If you have insufficient RAM for the image you are stitching, you may not see significant speed improvements.

As always with performance measurement, YMMV.

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