80 lines
2.1 KiB
Bash
80 lines
2.1 KiB
Bash
#!/bin/sh
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# read memory values in kB
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get_mem_info() {
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# Linux / FreeBSD / OpenBSD / BusyBox
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if command -v free >/dev/null 2>&1; then
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# free outputs in KiB unless -b is added
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# We parse: total + available
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set -- $(free | awk '/Mem:/ {print $2, $7}')
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mem_total=$1
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mem_avail=$2
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return 0
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fi
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# macOS / BSD via sysctl
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if command -v sysctl >/dev/null 2>&1; then
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# total memory
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mem_total_bytes=$(
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sysctl -n hw.memsize 2>/dev/null || \
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sysctl -n hw.realmem 2>/dev/null || \
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sysctl -n hw.physmem 2>/dev/null || \
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sysctl -n hw.physmem64 2>/dev/null
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)
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if [ -n "$mem_total_bytes" ] 2>/dev/null; then
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mem_total=$(expr "$mem_total_bytes" / 1024) # convert to kB
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else
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mem_total=""
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fi
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# available memory varies by OS; fallback to inactive + free
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page_size=$(sysctl -n vm.stats.vm.v_page_size 2>/dev/null)
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free_pages=$(sysctl -n vm.stats.vm.v_free_count 2>/dev/null)
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inactive_pages=$(sysctl -n vm.stats.vm.v_inactive_count 2>/dev/null)
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if [ -n "$page_size" ] && [ -n "$free_pages" ]; then
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mem_avail=$(expr \( "$free_pages" + "${inactive_pages:-0}" \) \* "$page_size" / 1024)
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return 0
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fi
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fi
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# Unknown system
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mem_total=""
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mem_avail=""
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return 1
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}
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slug='memory-usage'
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name='Memory Usage'
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available=1
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if ! get_mem_info; then
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available=0
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fi
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if [ -z "$mem_total" ] || [ -z "$mem_avail" ] || [ "$mem_total" -eq 0 ] 2>/dev/null; then
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available=0
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fi
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recommend=1
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THRESHOLD=90
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check() {
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get_mem_info
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mem_used_pct=$(
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awk -v t="$mem_total" -v a="$mem_avail" '
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BEGIN {
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used = t - a;
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pct = (used * 100) / t;
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printf "%d", pct;
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}
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'
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)
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if [ "$mem_used_pct" -ge "$THRESHOLD" ] 2>/dev/null; then
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warn "" "$mem_used_pct" "Memory usage is at ${mem_used_pct}%"
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else
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ok "" "$mem_used_pct" "Memory usage is at ${mem_used_pct}%"
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fi
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}
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