Added a new option to wspy to get the performance counters from the linux kernel. This builds on my previous learnings to inventory the system and build counter information provided by the system including event numbers, umasks and other fields.
Continue reading →I have found the counters necessary for wspy to get memory reads/writes. It wasn’t completely straightforward, so this documents the steps I took.
Continue reading →I have enhanced wspy to read performance counters. It now has three different instrumentation methods: Reading ftrace logfiles from kernel subsystem. Currently reads the scheduler events for fork/exec/exit to construct process trees Reading /proc/stat on periodic basis (once per second) … Continue reading →
During a recent look at likwid-perfctr the performance counters didn’t look right in several aspects: CPU core to CPU core differences in what should be a symmetric benchmark and where wspy results showed processes balanced run to run differences with … Continue reading →
The likwid performance monitoring and benchmarking suite has multiple tools including: likwid-topology – print thread, cache and NUMA topology likwid-pin – pin threaded applications to processors likwid-bench – micro-benchmarking application likwid-agent – monitoring agent for hardware performance counters As of … Continue reading →