Lightroom: Set a size limit for the previews folder

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  • Updated 7 years ago
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I'd like to see an alternative for configuring the previews folder expiry. I'd rather not ever throw away a preview, however setting the option to "never" will eventually fill the disk. As a side note - I have a dedicated SSD for my previews and catalog. The speed is great on the SSD, but since it isn't big, I've easily filled the drive.

Once the drive fills LR stops generating new previews until I manually take action. The alternative is to set the expiry to something like a day or a week or a month. None of these options really does what I want though - I want to donate large amounts of diskspace to the previews so that it is as fast as possible, but not have to deal with the disk full situation with manual intervention.

Ideally an alternative configuration item would be to set the maximum size in GB of the previews folder.
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Damon Brodie

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Posted 8 years ago

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Rikk Flohr, Champion

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I think this is a reasonable suggestion-especially given the small size of SSD drives currently.

How would you like the purging handled in a Size-Limited environment? First In -First Out?
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Damon Brodie

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First in-First Out is reasonable. Another possibility is purge the oldest accessed preview.

I'd be happy with either
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Ian Lyons, Champion

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Setting the 1:1 option to 30 days is intended to delete the 1:1 previews, but leave the standard sized previews behind. Deleting everything is a recipe for major pain!

Note: Lr 3.3 has bug (fixed in 3.4) whereby 1:1 previews where never purged
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Rikk Flohr, Champion

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Ian's comment is a good thought. While this does put your previews on a very fast device, it will cost you time in rebuilding previews if you reach your threshold often. Only you, after some testing, can say if that is a net win.

Until devices like SSD get large enough for this to be a non-issue that would be the struggle.
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Beat Gossweiler

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Well, there could be a strategy of first deleting 1:1 previews if the threshold is reached, but keep the standard size previews as long as they fit into the quota assigned.

Beat
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Ian Lyons, Champion

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Much is made of SSD, but for the most part it has little to offer in terms of a "performance boost" for Lightroom.

I posted my thoughts here http://www.computer-darkroom.com/blog...
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Rob Cole

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Thanks for the link Ian. I also found surprisingly little improvement in rendering times when upgrading to SSD (and surprisingly big improvement upgrading my motherboard/cpu/ram).

I'd love to see your benchmarks for ACR cache, or anybody elses (even if informal). ACR cache isn't helping dev module rendering speed for me (or at least not noticeably/significantly) - and I've heard stories ranging from "doesn't help me either", to "helps a little if not many adjustments have been applied", to "its about 5 times faster when there's a cache hit" - I don't know what to believe: is there a bug that bites some not others?, or are people just delusional... - I'd *really* like to figure this one out - I've either got an unusual problem that I'd *really* like to solve, or the acr cache is just darn near useless - which is it?
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Bryn Forbes

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By the way, you'll notice a huge speed up using SSDs if you are copying the previews folder from one SSD to another! All those tiny files in random locations really slow down rotating media
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Damon Brodie

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Great link Ian. I was going to do a similar set of tests but you beat me to it :-)

I have a sandy bridge i7 setup and 16 gigs ram (running at 4.8GHz) and LR still feels slow while louping...

Thanks again for the tests!
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Bryn Forbes

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I just requested ability to select some photos and discard the standard previews which is some what related to this topic.

http://feedback.photoshop.com/photosh...

I'd also like the ability to set a max size for the preview folders. But I think there needs to be a thumbnail sized preview such that when the standard previews are discarded offlines files can still be minimally identified.