#psi

Performance & Scaling

Linux performance triage in ten minutes: vmstat, iostat, pidstat and PSI, in that order

Kenji Watanabe · Jul 3, 2026 · 7 min read

When a Linux server is slow, the order of the first commands matters more than the tools. A ten-minute triage routine that tells CPU, memory, disk and network pressure apart, what each column actually means, and the mistakes that send people down the wrong path.

MLOps

Monitoring ML models in production when labels arrive weeks later

Ryan Pham · May 28, 2025 · 6 min read

Accuracy is the metric everyone wants, and for many models the labels arrive weeks or months after the prediction. This guide covers what to monitor in the meantime: data quality, input drift with PSI and KS tests, prediction drift, and alert design that does not cry wolf.