I’ve been using VVVV for the last few months and it’s been brilliant. Insane resolution across multiple displays at a buttery smooth 60fps with most of the machines I’ve run it on. However, when I put it on the final hardware, I had huge slowdowns on some normally fine operations.
What I’m doing is using the Ex9 player patch with a sequence of 1600x2400 jpeg images. It can run mostly black images (100kB), but high-detail images (1.1MB) make it slow down and stutter hugely. At the start, on the first few seconds, I still get an easy 60fps, but as the sequence goes on, it drops to 7-8fps.
The machine I’m running it on has two of the Quadro k5000 graphics cards, 64GB of RAM, four 500GB SSDs in a RAID 5 configuration, and an Intel Xeon E5-2650. By all measures, a beast of a machine.
I’d thought it was a hard-drive read speed issue, but on testing, it can do 6GB/s. Anyone have any idea what might be going wrong? Any thoughts would be greatly appreciated :)
i’d recommend not to stream jpeg-sequences but to convert them to dds (uncompressed RGB or a dxt codec), ideally with image dimensions that are a power of 2.
while jpegs have to be decompressed on the cpu and can only then be transferred to the GPU-memory for display, the dds format was made for direct loading into GPU-memory (and if you are using DXT compression, it can be decoded directly on the GPU).
even though your machine is a beast, the jpeg decompression might be a bottleneck.
