I found this chart in a recent paper. I've emailed the author about it but they didn't reply.
I want to create something similar but I don't know what the correct software to use is.
I need the following:
- category grouping (small/medium/large)
- column/bar labelling (1, 2, 4)
- stacked bars (comp/mem/TLB/idle) <-- maybe stacked isn't the right word, but I also need to show a percentage breakdown in the same way.
- grayscale. This image is very printer-friendly
Can this be done with pgfplots? If not, what software could I use?

pgfplotsand itsy bar stacked-feature. – Johannes_B Dec 12 '13 at 16:47