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Diagnose High Load on a Linux Server

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Linux & Systems intermediate 8 min read $0.01 Updated 2026-10-19

A fixed triage for a loaded Linux host: what load average means, then CPU, memory and swap, disk I/O and iowait, per-process and per-service culprits with top, vmstat, iostat and pidstat, and the usual fixes.

The load average is far above the CPU count and the server feels slow. Decide whether the cause is CPU, memory pressure, disk I/O or a runaway process, using a few commands in a fixed order.

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#linux#load-average#performance#cpu#io-wait

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