Hi I am learning PETSc (a software for solving PDES' numerically in parallel) and I came this passage in the FAQ
High per-CPU memory performance is required. Each CPU (core in multi-core systems) needs to have its own memory bandwith of roughly 2 or more gigabytes/second. For example, standard dual processor "PC's" will not provide better performance when the second processor is used, that is, you will not see speed-up when you using the second processor. This is because the speed of sparse matrix computations is almost totally determined by the speed of the memory, not the speed of the CPU
I am using Debian Linux and Ubuntu Linux systems on my computers. How do I find out the memory-bandwidth in Gb/s of my cpu? Are there any linux commands for this.