feat(server): generate all thumbnails for an asset in one job #13012
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mertalev
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jrasm91
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Sep 28, 2024
| await this.assetRepository.upsertFile({ assetId: asset.id, type: AssetFileType.THUMBNAIL, path: thumbnailPath }); | ||
| await this.assetRepository.update({ id: asset.id, updatedAt: new Date() }); | ||
| await this.assetRepository.upsertJobStatus({ assetId: asset.id, thumbnailAt: new Date() }); | ||
| await this.assetRepository.upsertJobStatus({ assetId: asset.id, previewAt: new Date(), thumbnailAt: new Date() }); |
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In the future should we combine these into one column?
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I think so. There's not much point to having both when they get set at the same time.
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It's great. I wonder how many assets you ran the test on? |
I ran it on 3,500 images. |
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Description
This PR changes image thumbnail generation to first decode and resize the input image to a preview-sized raw buffer, then reuse that buffer as the input for the preview, thumbnail and thumbhash. This has several advantages:
A concern I had was around RAM usage. Remarkably, this approach uses less RAM than the current one despite the use of an in-memory buffer. Peak memory usage dropped from 2.47GiB to 1.22GiB during testing, and the average is also lower compared to preview generation.
Video thumbnails are not optimized in this PR to keep it smaller and more focused. A later PR will use a similar approach through FFmpeg. In the meantime, I refactored the code such that it will be easy to make this change. I intentionally made it generate video thumbnails sequentially instead of using
Promise.allto avoid excessive resource usage.Testing
I ran thumbnail generation on all assets and confirmed that jobs were processed successfully. Setting different image settings and enabling the "extract embedded preview" setting all functioned as expected. I additionally ran an image-only comparison on all assets:
In order from left to right:
On main, generating the previews took 43 minutes and completing all jobs took 76 minutes , while this PR completed all thumbnail generation tasks in 44 minutes. For this particular library with default settings, this is a ~73% speedup for images. The gap will widen with more RAW or high megapixel images and when the "extract embedded preview" setting is enabled.