[SyzygyRhythm]

Sometimes you have to optimize other people's code. Also, sometimes code behaves unexpectedly depending on the data, say over a certain size threshold. And sometimes it behaves differently on different hardware. You don't always find these things out until production.

[saagarjha]

I don't really understand how PC sampling is going to help you with this

[gnurizen]

A lot of times the performance is data dependent, like randomized data can result in poor warp utilization where as sorted data can be much more efficient because you have less warps sitting around idle. We have an upcoming blog post on decompression kernels that show this clearly, stay tuned!