Adobe Lightroom Parallel Processing Speeds Up JPEG Export by 50%

Started Mar 5, 2013 | Discussions thread
AxelR
Contributing MemberPosts: 995
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Re: Adobe Lightroom Parallel Processing Speeds Up JPEG Export by 50%
In reply to Tom_N, Mar 6, 2013

Tom_N wrote:

AxelR wrote:

50% speedup with 400% more CPU power sounds like awful scalability to me.

"400% more CPU power" assumes that Lightroom JPEG export is completely single-threaded. We do not know if that is the case. It could be that Lightroom uses more than one CPU core, but isn't written in such a way that it can keep four cores (eight virtual cores on a Core i7) busy. Say (for the sake of example) that it completely used two real cores (four virtual cores) and no more; then you'd expect at best a 100% increase (doubling) in CPU power usage due to user-created parallel jobs.

Also, there may be barriers to scalability other than raw CPU power. For instance, if there is any locking on the Lightroom database, this could be forcing some of the four instances of Lightroom to sit idle for a while.

Yes I see we are on the same page: LR does not scale well.

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