Posts tagged “performance”
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Finding false sharing with perf c2c: reading code that fights over one cache line
Adding threads but not getting faster? Find false sharing with Linux perf c2c: record and report options, reading offsets, CPU support differences and fixes, per the official docs.
Reading Linux Transparent Huge Pages settings: enabled, per-size controls, madvise and khugepaged
THP has a top-level enabled file and per-size hugepages-<size>kB/enabled files. It covers inherit, MADV_HUGEPAGE/MADV_NOHUGEPAGE and khugepaged, and how to check real use in /proc and sysfs.
Linux minor vs major page faults: what ru_minflt and ru_majflt count
On Linux, getrusage's ru_minflt and ru_majflt split page faults by whether I/O was needed. What the two counters measure, and why a major fault count is not a count of disk reads (man-pages 6.19).
Is a load average of 4.0 high? What Linux load average counts and what 1, 5 and 15 minutes mean
Linux load average isn't CPU usage. It's a decaying average of runnable (R) and uninterruptible (D) tasks. How the kernel computes it, how to read it against CPU count, and how PSI differs.
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