Measure how long an app changing module cannot answer, against a host restart (030)

An app of a million items (a list grown by doubling) or of a thousand, in
a host of apps, its store in RAM: the longest gap between two answered
writes while it changes module on SIGHUP (stopped and started again from
its store, 71e319b), and while the host is restarted. A thousand items:
1.59 ms against 3.05 (median of 20 and 10). A million: 150.64 ms against
149.73 (10 and 5): both are the store read again (pure_app_start, 142
ms), so changing does not answer sooner than restarting.

1 files changed, 25 insertions, 0 deletions

diff --git a/research/experiments/030-app-lifecycle/runs.sh b/research/experiments/030-app-lifecycle/runs.sh
new file mode 100755
index 0000000..601f754
--- /dev/null
+++ b/research/experiments/030-app-lifecycle/runs.sh
@@ -0,0 +1,25 @@
+#!/bin/sh
+# The runs of research 115 (docs/design/017's stage 3), from the repository's
+# root, in steps, each under research/guard.py:
+#   runs.sh build NAME COMMIT   pure-serve of COMMIT, with its pure-crypto.so,
+#                               in ~/.cache/pure-030/NAME
+#   runs.sh window NAME ITEMS CHANGES RESTARTS [MODULE]   window.py on that
+#                               build, into DATE-window-NAME-ITEMS[-MODULE].jsonl
+set -e
+out=research/experiments/030-app-lifecycle
+builds=$HOME/.cache/pure-030
+day=$(date +%F)
+case "$1" in
+build)
+    rm -rf "$builds/src-$2"
+    git worktree add -f -q --detach "$builds/src-$2" "$3"
+    make -s -C "$builds/src-$2" build/pure-serve build/pure-crypto.so
+    mkdir -p "$builds/$2"
+    cp "$builds/src-$2/build/pure-serve" "$builds/src-$2/build/pure-crypto.so" "$builds/$2/"
+    git worktree remove --force "$builds/src-$2" ;;
+window)
+    until awk '{ exit !($1 < 1.5) }' /proc/loadavg; do sleep 10; done
+    python3 research/guard.py --most 2048 -- python3 $out/window.py "$builds/$2/pure-serve" "$3" "$4" "$5" ${6:+"$6"} \
+        > "$out/$day-window-$2-$3${6:+-$6}.jsonl" ;;
+*) echo "runs.sh build NAME COMMIT | window NAME ITEMS CHANGES RESTARTS [MODULE]" >&2; exit 2 ;;
+esac