Gallery of Processor Cache Effects

I am not seeing it mentioned anywhere, but for people looking for a good starting point on "low-level" CPU performance debugging, intel's CPU top-down u-architecture method (https://www.intel.com/content/www/us/en/docs/vtune-profiler/...) is a good systematic way to understand where you CPU is speeding most of it's cycle. They also have two tools which basically implement this analysis and spit a bunch of very useful metric that are actionable and very easy to understand - Intel Vtune is a fantastic tool to start…

When I worked at LSI Logic, we had a dual core processor that didn't have any cache consistency at all between cores. You actually had to pad all memory allocations to a cache line so that the two cores didn't interfere with each other. Unfortunately, we also let our customers develop their own code. One of our best customers (Motorola) starting having problems with one of their projects. Small changes in their code would cause all kinds of bizarre crashes…

For those interested about RAM timings, effects of cache, and other low level memory topics explained exceptionally well, check out "What Every Programmer Should Know About Memory"[1] [1] http://people.redhat.com/drepper/cpumemory.pdf

Very interesting (but not exactly news) But I suppose in this "modern world" most people forget how their processors work