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virtual-dsm/src/memory.sh
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#!/usr/bin/env bash
set -Eeuo pipefail
msg="Checking memory..."
enabled "$DEBUG" && echo "$msg"
RAM_AVAIL=$(free -b | grep -m 1 Mem: | awk '{print $7}')
AVAIL_MEM=$(formatBytes "$RAM_AVAIL")
checkConfiguredMemory() {
local wanted msg
if disabled "$RAM_CHECK" || [[ "${RAM_SIZE,,}" == "max" || "${RAM_SIZE,,}" == "half" ]]; then
return 0
fi
wanted=$(numfmt --from=iec "$RAM_SIZE")
if (( (wanted + RAM_SPARE) > RAM_AVAIL )); then
msg="Your configured RAM_SIZE of ${RAM_SIZE/G/ GB} is too high for the $AVAIL_MEM of free memory available,"
if [[ "${FS,,}" == "zfs" ]]; then
info "$msg but since ZFS is active this will be ignored."
else
RAM_SIZE="max"
warn "$msg it will automatically be adjusted to a lower amount."
fi
else
if (( (wanted + (RAM_SPARE * 3)) > RAM_AVAIL )); then
msg="your configured RAM_SIZE of ${RAM_SIZE/G/ GB} is very close to the $AVAIL_MEM of free memory available,"
if [[ "${FS,,}" == "zfs" ]]; then
info "$msg but since ZFS is active this will be ignored."
else
warn "$msg please consider a lower amount."
fi
fi
fi
return 0
}
configureHalfMemory() {
local wanted
if [[ "${RAM_SIZE,,}" != "half" ]]; then
return 0
fi
if (( (RAM_AVAIL / 2) > RAM_SPARE )); then
wanted=$(( (RAM_AVAIL / 2) / 1048577 ))
RAM_SIZE="${wanted}M"
info "Allocated $wanted MB of RAM for the virtual machine."
else
RAM_SIZE="max"
fi
return 0
}
configureMaxMemory() {
local wanted
if [[ "${RAM_SIZE,,}" != "max" ]]; then
return 0
fi
if (( RAM_AVAIL < (RAM_SPARE * 2) )); then
wanted=$(( RAM_AVAIL / 2 ))
else
wanted=$(( RAM_AVAIL - (RAM_SPARE * 3) ))
if (( wanted < (RAM_SPARE * 6) )); then
wanted=$(( RAM_AVAIL - RAM_SPARE ))
fi
fi
wanted=$(( wanted / 1048577 ))
RAM_SIZE="${wanted}M"
info "Allocated $wanted MB of RAM for the virtual machine."
return 0
}
checkMinimumMemory() {
local wanted
wanted=$(numfmt --from=iec "$RAM_SIZE")
if [ "$wanted" -lt "$RAM_MINIMUM" ]; then
wanted=$(( wanted / 1048577 ))
error "Not enough memory available, there is only $wanted MB left!"
exit 16
fi
return 0
}
checkConfiguredMemory
configureHalfMemory
configureMaxMemory
checkMinimumMemory
return 0