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#!/usr/bin/env bash
# Don't use set -x here, since it generates a lot of output and slows
# the script down, causing unexpected test fails.
set -eu
set -o pipefail
PAGE_SIZE=$(getconf PAGE_SIZE)
BLOAT_ITERATION_TARGET=$((100 << 20)) # 100 MB
BLOAT_HOLDER=()
PID="$$"
function bloat {
local set_size mem_usage target_mem_size
# Following `| cat` weirdness is intentional to generate some reclaim
# activity in case there's no swap available.
set_size=$(cut -d " " -f2 "/proc/$PID/statm" | cat)
mem_usage=$((set_size * PAGE_SIZE))
target_mem_size=$((mem_usage + $1))
BLOAT_HOLDER=()
while [[ "$mem_usage" -lt "$target_mem_size" ]]; do
echo "target $target_mem_size"
echo "mem usage $mem_usage"
BLOAT_HOLDER+=("$(printf "=%0.s" {1..1000000})")
set_size=$(cut -d " " -f2 "/proc/$PID/statm" | cat)
mem_usage=$((set_size * PAGE_SIZE))
done
}
function run {
local arr=()
while :; do
bloat "$BLOAT_ITERATION_TARGET"
arr+=("${BLOAT_HOLDER[@]}")
sleep 1
done
}
run
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