Solution: Finding memory bottlenecks

- [Instructor] Okay, solutions to the challenges.…First of all, on the slide, I'll give you some hints…after we go through the slide here.…You can pause it and try some more if you didn't finish,…or you can keep listening and I'll show you how…I actually solve the challenges.…So for the first question, what we want to do is…use the size of your L2 cache.…So the tricky thing there might be to find the size…of your L2 cache.…

Well the key is the command lscpu.…Maybe you had to install it on your system,…you didn't have it, and then just look for the line…that says L2 cache, and then use that…when you run our cpucache program.…For the second question, it's how to use this perf command.…So you'd run it twice "perf stat -d -d"…and our cpucache giving it the size there,…maybe that's your L2 size,…or the 4 meg is what we're talking about,…and you run it once with the zero, once with the one,…(mumbles) skip it around or not,…and we want to grep the output of the perf command,…the line that says dcache-load-misses,…and I think you'll find there's…