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#!/usr/bin/env bash
# Background workload for demo tapes. Generates a steady mix of file I/O
# (open/read/close), big writes (fsync/dd), stat-heavy traffic, and ioworkload
# scenarios so every TUI tab has something interesting to display.
#
# Designed to be killed via `kill $!` from the tape wrapper. All children are
# placed in this script's process group so a single signal cleans them up.
set -u
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
IOWORKLOAD="${ROOT}/../ioworkload"
SCRATCH="$(mktemp -d -t ior-demo-workload-XXXXXX)"
trap 'rm -rf "$SCRATCH"' EXIT
cleanup() {
trap - TERM INT
# Kill the entire process group so all background loops stop.
kill -- -$$ 2>/dev/null || true
exit 0
}
trap cleanup TERM INT
# A) walk /usr and read first byte of each file: tons of openat/read/close + varied paths.
(
while true; do
find /usr/share /usr/lib -maxdepth 4 -type f 2>/dev/null \
| shuf -n 800 \
| xargs -r -I{} sh -c 'head -c 1 "{}" >/dev/null 2>&1' || true
sleep 1
done
) &
# B) periodic large write with fsync via dd: fills the latency tab with slow writes.
(
while true; do
dd if=/dev/zero of="${SCRATCH}/big.bin" bs=1M count=20 conv=fsync status=none 2>/dev/null || true
sleep 3
rm -f "${SCRATCH}/big.bin"
done
) &
# C) stat-heavy directory crawl: feeds the syscall tab with newfstatat/getdents.
(
while true; do
find /etc /var/log -maxdepth 3 >/dev/null 2>&1 || true
sleep 2
done
) &
# D) ioworkload scenario rotation if the binary exists: gives us syscall variety
# beyond what the shell utilities trigger (mmap, dup, fcntl, sync, rename, link).
if [ -x "$IOWORKLOAD" ]; then
(
scenarios=(
open-basic
readwrite-basic
stat-basic
stat-statx
mmap-basic
sync-basic
dup-basic
fcntl-dupfd
rename-basic
link-basic
dir-basic
)
while true; do
for s in "${scenarios[@]}"; do
"$IOWORKLOAD" --scenario="$s" >/dev/null 2>&1 || true
done
done
) &
fi
# Idle until killed.
wait
|
