L3 is generally on the order of the same time as main memory - it's main purpose is to reduce the total amount of requests in order to conserve bandwidth
SSDs are on the order of 0.1ms, so 100,000 ns, give or take a factor of 10.
Someone smarter than me will have to answer the NUMA node question.
I think L3 is much faster; perhaps 1/3rd of main memory, assuming the line is available and not in another core. Here are some numbers for L3 cache, from Intel (probably specific to the 5500 series)[1]:
L3 CACHE hit, line unshared ~40 cycles
L3 CACHE hit, shared line in another core ~65 cycles
L3 CACHE hit, modified in another core ~75 cycles
remote L3 CACHE ~100-300 cycles
Local Dram ~60 ns
Remote Dram ~100 ns
I was trying to make the point that these numbers are somewhat arbitrary (i.e. why do I need to know the access speed to disc, when I keep everything in memory on a NUMA system?) and don't apply to all programmers (e.g. embedded systems may not have discs, L2 Caches or internet access).
L3 is generally on the order of the same time as main memory - it's main purpose is to reduce the total amount of requests in order to conserve bandwidth
SSDs are on the order of 0.1ms, so 100,000 ns, give or take a factor of 10.
Someone smarter than me will have to answer the NUMA node question.