I have set up a new AMD performance machine for experiments. The processors is a Ryzen 7840 (Phoenix) in a Beelink SER7 mini-PC. Following are some of the major parameters. This comparison is with Intel i5-13500H which will be my … Continue reading →
I copied Stream from https://www.cs.virginia.edu/stream/ and put a copy in https://github.com/cycletourist/perf. This suggested the following compilation flags On my system with a Ryzen 7 7800X3D this results in the following performance: The question is what is the sensitivity of various … Continue reading →
From past work, we know the five counters required to compute the first level topdown metrics on Intel processors: CLK_UNHALTED_CORE = 0x00 IDQ_UOPS_NOT_DELIVERED_CORE = 0x9C, umask=1 UOPS_RETIRED_RETIRE_SLOTS = 0xC2, umask=2 UOPS_ISSUED_ANY = 0x0E, umask=1 INT_MISC_RECOVERY_CYCLES = 0x0d, umask=3, cmask=1 These … Continue reading →
It looks like there are many new capabilities in the linux perf command run on a Zen4 core under Linux 6.2 when compared with Zen1 core under Linux 5.4. I compared the “perf list” output between: Ubuntu 20.04, Linux 5.4, … Continue reading →
Back in 2018, I set up a website at perf.mvermeulen.com to document my explorations of performance topics. This website is continuing that tradition but providing a new location including using the central administration and https certificate from mvermeulen.org. Otherwise I … Continue reading →