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diff --git a/research/experiments/025-i64-cost/ab-sessions.sh b/research/experiments/025-i64-cost/ab-sessions.sh
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+++ b/research/experiments/025-i64-cost/ab-sessions.sh
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+#!/bin/zsh
+# ab-sessions.sh DIR A B SESSIONS: ab.py on fresh processes each session,
+# pure-serve-A and pure-serve-B from DIR, which starts first alternating;
+# each session waits for a load average below 2.
+here=${0:A:h}
+dir=$1 a=$2 b=$3 n=$4
+for i in $(seq 1 $n); do
+  until [ "$(cut -d' ' -f1 /proc/loadavg | cut -d. -f1)" -lt 2 ]; do sleep 5; done
+  if (( i % 2 )); then first=$a second=$b; else first=$b second=$a; fi
+  echo "== session $i first=$first $(cut -d' ' -f1-3 /proc/loadavg)"
+  python3 $here/ab.py $dir/pure-serve-$first $dir/pure-serve-$second 6 30 2>&1
+done
+echo "== end"