Tweet
#!/bin/bash
# Copyright George Scorer, March 2019.
# You may copy and/or modify and/or use this script as you see fit. There is no warranty of any kind.
# Each memory p-state switch causes a screen flicker. Tweak these variables to match
# your personal 'flicker aversion' vs 'efficiency and silence desire' trade-off.
# These variables are integers.
GPU_BUSY_UP=80 # The gpu_busy_percent at and above which we consider the gpu is busy
GPU_BUSY_DOWN=10 # The gpu_busy_percent at and below which we consider the gpu is idle
LOW_MEM_STATE=0 # Choose between 0 & 1
STANDARD_SLEEP_INTERVAL=1 # in seconds. How frequently we should poll the core p-state.
DOWN_DELAY=10 # in seconds. How long the gpu should appear to be idle before we drop down.
# These variables are floating point.
CONCENTRATE_SLEEP_INTERVAL=0.1 # in seconds. How frequently we should poll when we're proposing to jump up.
UP_DELAY=0.5 # in seconds. How long the gpu should appear to be busy before we jump up.
# Sysfs paths here are hardcoded for one amdgpu card at card0; adjust as needed.
FILE_PERF_LEVEL=/sys/class/drm/card0/device/power_dpm_force_performance_level
FILE_MEM_P_STATE=/sys/class/drm/card0/device/pp_dpm_mclk
FILE_GPU_BUSY_PERCENT=/sys/class/drm/card0/device/gpu_busy_percent
# check for root privileges
if [ $UID -ne 0 ]
then
echo "Writing to sysfs requires root privileges; relaunch as root"
exit 1
fi
function get_started {
# Set gpu performance level control to manual
# echo "Setting performance level control to manual"
echo "manual" > "$FILE_PERF_LEVEL"
# Read the current gpu busy percentage and set a corresponding initial memory p-state
GPU_BUSY_PERCENT="$(<$FILE_GPU_BUSY_PERCENT)"
if [ "$GPU_BUSY_PERCENT" -ge "$GPU_BUSY_UP" ]; then
MEM_P_STATE=2
else
MEM_P_STATE=$LOW_MEM_STATE
fi
echo "$MEM_P_STATE" > "$FILE_MEM_P_STATE"
echo "New gpu memory p-state: $MEM_P_STATE"
PROPOSED_MEM_P_STATE=$MEM_P_STATE
SLEEP_INTERVAL=$STANDARD_SLEEP_INTERVAL
}
function check_gpu_busy_percent {
GPU_BUSY_PERCENT="$(<$FILE_GPU_BUSY_PERCENT)"
# Propose what the corresponding memory p-state should be
OLD_PROPOSED_MEM_P_STATE=$PROPOSED_MEM_P_STATE
PROPOSED_MEM_P_STATE=$MEM_P_STATE
if [ "$GPU_BUSY_PERCENT" -ge "$GPU_BUSY_UP" ]; then
PROPOSED_MEM_P_STATE=2
elif [ "$GPU_BUSY_PERCENT" -le "$GPU_BUSY_DOWN" ]; then
PROPOSED_MEM_P_STATE=$LOW_MEM_STATE
fi
if [ "$PROPOSED_MEM_P_STATE" -eq "$MEM_P_STATE" ]; then
# We're happy in this memory state - go back to sleep
SLEEP_INTERVAL=$STANDARD_SLEEP_INTERVAL
else
# We want to change so determine whether we're already counting down.
if [ "$PROPOSED_MEM_P_STATE" -ne "$OLD_PROPOSED_MEM_P_STATE" ]; then
# Start a new countdown
if [ "$PROPOSED_MEM_P_STATE" -eq 2 ]; then
# We might be going up; check more frequently to avoid jumping on a spike. (bad)
CHANGE_COUNTDOWN=$UP_DELAY
SLEEP_INTERVAL=$CONCENTRATE_SLEEP_INTERVAL
else
CHANGE_COUNTDOWN=$DOWN_DELAY
SLEEP_INTERVAL=$STANDARD_SLEEP_INTERVAL
fi
else
CHANGE_COUNTDOWN=$( echo "$CHANGE_COUNTDOWN - $SLEEP_INTERVAL" | bc )
fi
if (( $( echo "$CHANGE_COUNTDOWN <= 0.0" | bc ) )); then
# The countdown has reached 0 so change the memory p-state.
MEM_P_STATE=$PROPOSED_MEM_P_STATE
# echo "manual" > "$FILE_PERF_LEVEL"
echo "$MEM_P_STATE" > "$FILE_MEM_P_STATE"
echo "New gpu memory p-state: $MEM_P_STATE"
fi
fi
# echo "Old Prop Mem Busy % Countdown"
# echo " $OLD_PROPOSED_MEM_P_STATE $PROPOSED_MEM_P_STATE $MEM_P_STATE $GPU_BUSY_PERCENT $CHANGE_COUNTDOWN"
}
function reset_on_fail {
echo "Exiting, setting memory p-state to 2"
echo "manual" > "$FILE_PERF_LEVEL"
echo "2" > "$FILE_MEM_P_STATE"
exit 1
}
# always try to fix memory p-state 2 on failure
trap "reset_on_fail" SIGINT SIGTERM
function run_daemon {
while :; do
# If mem_p_state in sysfs differs from our calculated MEM_P_STATE then restart.
# Causes: external change to power_dpm_force_performance_level, system sleep, a change to display configuration or a commit of a gpu voltage or clock frequency change.
# Note: we're only testing once every $SLEEP_INTERVAL seconds so it might take us a long time to spot a momentary change in mem_p_state.
SYS_MEM_P_STATE="$(grep -F '*' $FILE_MEM_P_STATE)"
SYS_MEM_P_STATE=${SYS_MEM_P_STATE:0:1}
if [[ $(< $FILE_PERF_LEVEL) != "manual" ]]; then
echo "Something's changed memory performance level; taking back control."
get_started
fi
if [[ $MEM_P_STATE != $SYS_MEM_P_STATE ]]; then
echo "Something's meddling with gpu memory p-states; taking back control."
get_started
fi
sleep $SLEEP_INTERVAL
check_gpu_busy_percent
done
}
get_started
# start the loop
run_daemon
$ cat $HOME/bin/shared/suspend-computer
#!/bin/bash
# suspend
sync
sudo sh -c "echo mem > /sys/power/state"
# resume
if [ $(hostname) == "desktop" ]; then
sleep 1
gpu-powersave # Script which selects lowest mclk+sclk
fi
Comment