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Old Slide Deck About Images
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Mike Danko
July 24, 2013
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Old Slide Deck About Images
Mike Danko
July 24, 2013
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Transcript
Performance Image Processing with Ruby And Friends
Who? • TWC Systems Engineer • Network/Systems/Video Integration. Mostly Video.
• Puts pic on slide, even though he’s standing right there.
Who? • Artisan/Grill Fairy/Beer Czar at Neo • Rails and
Stuff • Puts pic on slide, even though he’s standing right there.
Why Does it Matter?
Small Site Operator • Difference between free and not on
Heroku • More time for requests • Less of a chance of hitting the magic 30 second mark
Everyone Else • More efficient workers == Less $$$ •
Faster response == More $$$ • Less time doing the mundane means more time for the interesting.
Peer Pressure • A simple gem change can improve performance
by 220% • Another 15 minutes of work can offload uploads completely • It’s easy, come on.
When Not To... • You’re on jRuby • Your processing
needs are complex • You think you’re doing it right
Getting the Images
People Uploading • Don't tie up Ruby time • Given
Workers, go direct to S3 when you are using S3 • Use nginx’s upload module if that’s your bag
Basics • Your IO will block somewhere, avoid the CPU
• Decoupling IO from processing will do you wonders. • Use workers to your advantage
If You Give A Mouse an Image... • ImageMagick •
GraphicsMagick • ImageSorcery • ImageScience • OpenCV • For the brave... Intel IPP
No Processor is Alike • And they’re mostly really inefficient.
The Rundown
Backing Methods • Pure Ruby: ChunkyPNG • C: RMagick, ImageScience
• Subexec: MiniMagick, QuickMagick • Hybrids: ChunkyPNG/OilyPNG
Something Bothered Me • Went about profiling and benchmarking Ruby
• Went about profiling and benchmarking GM/ IM • Why is something as simple as changing the size of a picture so complex?
ruby-prof breakdown 0 20 40 60 80 Sorcery (IM) Sorcery
(GM) Science Mini (IM) Mini (GM) 73 40 0 0 0 14 20 0 10 12 0 31 14 23 28 23 30 16 22 34 Fit Fill Pad Slice Gif
None
None
Rules of Thumb • Use ImageScience whenever you can •
Next default to subexec’d GM • Use multiple gems if you need to, or patch an existing one. • Avoid calling IM/GM more than once per run