In this posting I summarize top-down performance counter analysis to evaluate workloads and show how this can be measured on Haswell using likwid-perfctr and perf. In part 2 to follow, I’ll describe how top down metrics have been added to … Continue reading →
Kicked off a run with the Phoronix CPU suite using likwid-perfctr. Benchmarks that were single-threaded were pinned to a single CPU, others to all CPUs. #!/bin/bash likwid-perfctr -a | tail +3 | awk ‘{ print $1 }’ | while read … 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 →