Comment by dist1ll

It's very interesting how abtracted away HPC sometimes looks from hardware. The books seem to revolve a lot around SPMD programming, algo & DS, task parallelism, synchronization etc, but very little about computer architecture details like supercomputer memory subsystems, high-bandwidth interconnects like CXL, GPU architecture and so on. Are the abstractions and tooling already good enough that you don't need to worry about these details? I'm also curious if HPC practitioners have to fiddle a lot of black-box knobs to squeeze out performance?