Another graphics card question

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Re: Another graphics card question

Post by admin »

This is very interesting. I did not really expect LHR cards to be impacted this much and I am a admittedly a little skeptical that LHR would hobble OpenCL performance in this way... :think:

Multi-core performance between a 5600X and 5900X should be definitely be noticeable in general usage.

The GPU version of StarTools still uses the CPU in many parts of algorithms where GPU acceleration is not possible or desirable (e.g. cases where GPU performance would be inferior to using the CPU). There are many such cases, usually involving complex branching and execution paths, or where it is not possible to efficiently parallelize calculations.

Modules in StarTools almost always consist of multiple steps, filters, convolutions, etc. It wholly depends on the constituent steps and algorithms how such a step is executed. For example, a convolution with a custom kernel (lots of brute-force multiplies, easy to parallelize) is much faster on the GPU, whereas a median filter (lots of branching, sorting, harder to parallelize efficiently) is much faster on the CPU.

Decon is indeed the most CPU and GPU demanding module, and you should see both CPU and GPU getting a workout, taking turns during every iteration.

Hope this helps,
Ivo Jager
StarTools creator and astronomy enthusiast
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Re: Another graphics card question

Post by riverpoet »

Mike in Rancho wrote: Sat Sep 24, 2022 8:37 pm Is that 3070 an older model, perhaps FE? I wasn't aware that you could get these in FHR anymore, but I should look. I don't know if I want to trust eBay though on something that could be a few hundy.
Older 3060, 3070, 3080 and 3080Ti are "FHR" alias full hash rate, and the newer ones have the limiter, LHR. All 3060Ti and 3070Ti are LHR. 3090 and 3090 TI do not have the limiter. You can get plenty of "FHR" cards on eBay these days are Ethereum mining is over, but the vast majority of them have been running 24/7 for years.
I'm looking for either 3090 or AMD 6900XT as my "astro processing card".
Mike in Rancho wrote: Sat Sep 24, 2022 8:37 pm New 1.8 HDR is very heavily CPU dependent, without a lot of GPU offloading. Just the type of calculations required, according to Ivo. There's a big thread here on it where several of us ran timed experiments trying out various module parameters to see their effect on completion times.
Intresting, I'm still using 1.7 as I have the compulsive need to reprocess all older data when I "discover" some better processing technique, and I also miss Reveal DSO Core in 1.8 HDR and that is a very important step in my workflow.

Peter
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hixx
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Re: Another graphics card question

Post by hixx »

Hi Peter,
I also miss Reveal DSO Core in 1.8 HDR and that is a very important step in my workflow.
As per inofficial manual / Guy's User note, there is a way to achieve the old V1.7 HDR settings in HDR 1.8.... :
Mimicking the Reveal DSO Core preset, as per
reduce Context Size, and only set Shadow Detail Boost, while leaving all other parameters (e.g. Gamma Highlight, Gamma Shadow and Highlights Detail Boost) alone. One difference though compared to 1.7, is that even at max settings, the detail recovered in 1.8 is much more carefully placed in its surroundings, and does not look artificial, while also perfectly conforming to the noise levels of its surroundings (the latter extends also covers the interaction with the Gamma Highlight/Shadow parameter - consistency is maintained).
You'll find more tips in the Inofficial manual (under downloads) or in User Notes (under Forum)
clear skies,
Jochen
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Re: Another graphics card question

Post by admin »

hixx wrote: Tue Sep 27, 2022 11:41 am Hi Peter,
I also miss Reveal DSO Core in 1.8 HDR and that is a very important step in my workflow.
As per inofficial manual / Guy's User note, there is a way to achieve the old V1.7 HDR settings in HDR 1.8.... :
Mimicking the Reveal DSO Core preset, as per
reduce Context Size, and only set Shadow Detail Boost, while leaving all other parameters (e.g. Gamma Highlight, Gamma Shadow and Highlights Detail Boost) alone. One difference though compared to 1.7, is that even at max settings, the detail recovered in 1.8 is much more carefully placed in its surroundings, and does not look artificial, while also perfectly conforming to the noise levels of its surroundings (the latter extends also covers the interaction with the Gamma Highlight/Shadow parameter - consistency is maintained).
You'll find more tips in the Inofficial manual (under downloads) or in User Notes (under Forum)
clear skies,
Jochen
I'll bring back a DSO Core preset in 1.9's HDR module. :thumbsup:
Ivo Jager
StarTools creator and astronomy enthusiast
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