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43 lines
1.6 KiB
Bash
43 lines
1.6 KiB
Bash
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#!/usr/bin/env bash
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# Run a command only once the machine is idle — so other workloads can't skew a
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# benchmark. This is how the published mining numbers were measured (see
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# docs/findings.md §7a): the run starts only after CPU idle stays above a
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# threshold for several consecutive polls.
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#
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# ./scripts/run_when_idle.sh python3 -m equix_bench run --config configs/mining.toml --out results/mining
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#
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# Env overrides:
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# IDLE_THRESH=85 required % CPU idle IDLE_NEED=3 consecutive polls
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# IDLE_POLL=25 seconds between polls IDLE_MAXWAIT=21600 give-up (s)
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set -uo pipefail
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[ $# -ge 1 ] || { echo "usage: $0 <command> [args...]" >&2; exit 2; }
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THRESH="${IDLE_THRESH:-85}"
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NEED="${IDLE_NEED:-3}"
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POLL="${IDLE_POLL:-25}"
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MAXWAIT="${IDLE_MAXWAIT:-21600}"
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cpu_idle() {
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case "$(uname -s)" in
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Darwin) top -l 2 -s 1 -n 0 2>/dev/null | grep 'CPU usage' | tail -1 \
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| sed -E 's/.* ([0-9.]+)% idle.*/\1/' ;;
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Linux) vmstat 1 2 2>/dev/null | tail -1 | awk '{print $15}' ;;
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*) echo 100 ;; # unknown platform: don't block
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esac
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}
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ok=0; elapsed=0
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echo "waiting for idle (>= ${THRESH}% CPU idle x ${NEED} consecutive polls)..."
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while :; do
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idle="$(cpu_idle)"; idle="${idle:-0}"
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if awk "BEGIN{exit !(${idle}+0 >= ${THRESH})}"; then ok=$((ok+1)); else ok=0; fi
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echo " idle=${idle}% streak=${ok}/${NEED} (waited ${elapsed}s)"
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[ "$ok" -ge "$NEED" ] && break
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sleep "$POLL"; elapsed=$((elapsed+POLL))
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[ "$elapsed" -ge "$MAXWAIT" ] && { echo "gave up waiting for idle after ${elapsed}s" >&2; exit 3; }
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done
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echo "system idle; running: $*"
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exec "$@"
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