In the previous post, I published my best set of numbers for local memory latency on a variety of AMD Opteron system configurations. Here I expand that to include remote memory latency on some of the systems that I have available for testing. Ranger is the oldest system still operational… read more
memory latency
What good are “Large Pages” ?
I am often asked what “Large Pages” in computer systems are good for. For commodity (x86_64) processors, “small pages” are 4KiB, while “large pages” are (typically) 2MiB. The size of the page controls how many bits are translated between virtual and physical addresses, and so represent a trade-off between what… read more
Memory Latency Components
A reader of this site asked me if I had a detailed breakdown of the components of memory latency for a modern microprocessor-based system. Since the only real data I have is confidential/proprietary and obsolete, I decided to try to build up a latency equation from memory…. Preliminary Comments: It… read more