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Re: Stitcher 5.5.2 update amazes me.

Ian Wood wrote:

You probably don't want to hear this, but a similar render using PTGui on a near-identical machines takes less than half the time... ;-)


To get back on that point: on a dual CPU, the load while remapping images into the "blending space" does not exceed 100%, and watching a CPU meter shows that the scheduler of the OS is "busy" (well, not really) moving threads from one CPU to the other to balance the thermal load. Disk access during this phase is negligible, and RAM usage is around 800 MB (of 3000). It's producing about one image per minute, a bit slower than that, even.
Once Stitcher gets to the blending stage, the disk access is the limiting factor. For the 18000x9000 panoramas, it's moving some 80-90 GBs around (according to Activity Monitor). CPU load is negligible, but RAM fills up rather fast.

So, there's still lots of room for improvement.
- more RAM will most likely help.
- the nonexisting parallelism during image remapping means that running it on a 2x2-core Intel MacPro @ 2.66 GHz will most likely not result in any significant gain over my current 2 GHz G5 (well, maybe 2.66 / 2 = 33 percent gain ;)
- warping ... should be easily scalable into parallel processing, even if it's only "one core per source image"
- blending ... not sure if this is something than can easy and efficiently be made into parallel CPU threads due to the whole irregular image intersection areas.
- filling up the MacPro disk slots to build a SATA RAID for swap space should net some more performance.
- an (unattainable) 20 GB "disk" made of RAM and attached by SATA-II would make the best swap space ever ;)

Yay! Lots of chances to tinker once/if i get my new machine :)

-Markus

Outside-the-box note: Cinema4D scales from 1-core to 4-core by a factor of 360 %, which isn't bad :) [unless hair simulation is involved - those pre-render passes are 1-core only]
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References: 
 >Stitcher 5.5.2 update amazes me. (From: Markus Altendorff <email@hidden>)
 >Re: Stitcher 5.5.2 update amazes me. (From: Ian Wood <email@hidden>)



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