Thanatomanic: Remove old info and redirect to Preferences page

2018-11-24T11:53:13Z

Remove old info and redirect to Preferences page

← Older revision		Revision as of 11:53, 24 November 2018
Line 1:		Line 1:
	The "Performance" tab is only for people who know what they're doing. It lets you poke under the hood and tweak the parameters of some tools. These parameters take part in the balance between speed and stability.		#REDIRECT [[Preferences#Performance_Tab]]

	~~== Maximum Number of Threads for Noise Reduction ==~~
	~~The~~ [[~~Noise Reduction~~]] algorithm in RawTherapee is very powerful. It is also quite CPU and memory intensive. People with weak hardware who experience crashes caused by running out of RAM may find that tweaking this parameter prevents those crashes, at the cost of longer processing time.

	[[Noise Reduction]] has a baseline requirement of 128MB of RAM for a 10 megapixel raw photo, or 512MB of RAM for a 40 megapixel one, and additionally 128MB of RAM per thread. The more threads run in parallel, the quicker the computation, but higher the memory requirement.

	Most modern CPUs run two threads per physical core. Find out what CPU you have and how many cores it has, multiply that by two, and you get the maximum number of threads it would make sense to run simultaneously. Let's call this number ''T<sub>max</sub>''. You would not benefit from running more threads than this - in fact you would likely suffer a small speed penalty.

	Setting this parameter to "0" will let your CPU figure out what ''T<sub>max</sub>'' is, and use that. If you experience crashes due to insufficient RAM, then you can calculate ''T<sub>max</sub>'' yourself and use a number lower than that.

DrSlony: Created page with "The "Performance" tab is only for people who know what they're doing. It lets you poke under the hood and tweak the parameters of some tools. These parameters take part in the..."

2014-01-27T09:53:16Z

Created page with "The "Performance" tab is only for people who know what they're doing. It lets you poke under the hood and tweak the parameters of some tools. These parameters take part in the..."

New page

The "Performance" tab is only for people who know what they're doing. It lets you poke under the hood and tweak the parameters of some tools. These parameters take part in the balance between speed and stability.

== Maximum Number of Threads for Noise Reduction ==
The [[Noise Reduction]] algorithm in RawTherapee is very powerful. It is also quite CPU and memory intensive. People with weak hardware who experience crashes caused by running out of RAM may find that tweaking this parameter prevents those crashes, at the cost of longer processing time.

[[Noise Reduction]] has a baseline requirement of 128MB of RAM for a 10 megapixel raw photo, or 512MB of RAM for a 40 megapixel one, and additionally 128MB of RAM per thread. The more threads run in parallel, the quicker the computation, but higher the memory requirement.

Most modern CPUs run two threads per physical core. Find out what CPU you have and how many cores it has, multiply that by two, and you get the maximum number of threads it would make sense to run simultaneously. Let's call this number ''Tmax''. You would not benefit from running more threads than this - in fact you would likely suffer a small speed penalty.

Setting this parameter to "0" will let your CPU figure out what ''Tmax'' is, and use that. If you experience crashes due to insufficient RAM, then you can calculate ''Tmax'' yourself and use a number lower than that.

Performance Tab - Revision history

Thanatomanic: Remove old info and redirect to Preferences page

DrSlony: Created page with "The "Performance" tab is only for people who know what they're doing. It lets you poke under the hood and tweak the parameters of some tools. These parameters take part in the..."