grep -rl "#performance" ~/writing ~/notes
#performance
1 post and 3 notes tagged performance.
20261 post
- 8 min
Linux load average is not CPU usage
Why a high load average can point at CPU pressure, blocked I/O, or scheduling pressure—and what to inspect next.
Notes
- TIL
MemoryHigh is a slope, MemoryMax is a cliff
A container that runs out of memory did not run out of machine memory — it hit a limit recorded under /sys/fs/cgroup, which is why free -h inside the container…
- TIL
perf counts, perf samples — pick the right one
perf has two modes and they answer different questions. Decide which one you are asking before you collect anything. Count when the question is how much:…
- TIL
Why is boot slow? Ask for the critical chain
systemd-analyze blame sorts units by how long they took to start, but units start in parallel, so the slowest one often isn't what delayed boot. This shows the…