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fancontrol.go
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fancontrol.go
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package main
import (
"bufio"
"fmt"
"log"
"os"
"os/exec"
"strconv"
"strings"
"time"
)
/*
* Fan control software for the following board(s):
* Supermicro PIO-617R-TLN4F+-ST031/X9DRi-LN4+/X9DR3-LN4+
*
* This is intended to provide a better fan curve for home usage on
* this motherboards so you neighbors don't think you are working
* on jet engines.
*
* DISCLAIMER: The author of this code provides the code free of
* charge with no conditions on usage and provides no warrantee or
* guarantee of any kind. Compile and run this at your own risk
* if your computer blows up, you win the lotto, or world war 3
* coincidentally starts after running this code, that is on you.
*
* Some day I will put a real license here, until then whatever
* happens, it is not my fault.
*
*/
const ipmitool = "/usr/bin/ipmitool"
var fanLowSpeed float64 = 80
var fanLowTemp float64 = 30
var fanHighSpeed float64 = 255
var fanHighTemp float64 = 80
// Temperature on last check
var lastTemp float64
// Temperature on last fan update
var lastSetTemp float64
// Figure out the number of CPU sockets
func getSocketCount() int {
totSockets := 0
file, err := os.OpenFile("/proc/cpuinfo", os.O_RDONLY, os.ModePerm)
if err != nil {
log.Fatal(err)
os.Exit(1)
}
defer file.Close()
sc := bufio.NewScanner(file)
for sc.Scan() {
line := sc.Text()
if strings.Contains(line, "physical id") {
socketId, _ := strconv.Atoi(strings.Split(line, ": ")[1])
if socketId+1 > totSockets {
totSockets = socketId + 1
}
}
}
if err := sc.Err(); err != nil {
log.Fatalf("scan file error: %v", err)
os.Exit(1)
}
return totSockets
}
// Get the CPU package temperature
func getPackageTemp(id int) int {
// Location of the temperature sensor
var tempLoc = fmt.Sprintf("/sys/class/thermal/thermal_zone%d/temp", id)
var packageTemp int
file, err := os.OpenFile(tempLoc, os.O_RDONLY, os.ModePerm)
if err != nil {
log.Fatal(err)
os.Exit(1)
}
defer file.Close()
sc := bufio.NewScanner(file)
for sc.Scan() {
line, _ := strconv.Atoi(sc.Text())
packageTemp = line / 1000
}
return packageTemp
}
// Get the package with the hottest temp
func getMaxPackageTemp(numSockets int) float64 {
var temps = make([]int, numSockets)
var maxTemp = 0
for i := 0; i < numSockets; i++ {
temps[i] = getPackageTemp(i)
}
for i, e := range temps {
if i == 0 || e > maxTemp {
maxTemp = e
}
}
return float64(maxTemp)
}
func runIpmiTool(args string) {
ipmitool := exec.Command(ipmitool)
ipmitool.Args = strings.Split(args, " ")
ipmitool.Run()
}
func updateFanSpeed(zone string, speed float64) {
ipmiArgs := fmt.Sprintf("%s raw 0x30 0x91 0x5A 0x3 %s 0x%x", ipmitool, zone, int(speed))
runIpmiTool(ipmiArgs)
}
// Manage the fan speed
func manageFans(curTemp float64) {
var fanSpeed float64 = fanLowSpeed
var zone = "0x10"
// Only need to change the fan speed if the temperature has changed
if int(curTemp) != int(lastTemp) {
if curTemp <= fanLowTemp {
fanSpeed = fanLowSpeed
} else if curTemp >= fanHighTemp {
fanSpeed = fanHighSpeed
} else {
var fanSpeedF float64 = ((curTemp - fanLowTemp) / (fanHighTemp - fanLowTemp)) * (fanHighSpeed)
fanSpeed = fanSpeedF
}
// Only update fan speed if temp has gone up by 2C or more since last
// time it was set. Or if temp has gone down by 5C or more since last
// time it was set.
if 2 >= int(curTemp)-int(lastSetTemp) {
fmt.Printf("Increasing fan speed to %d%%\n", int((fanSpeed/fanHighSpeed)*100))
updateFanSpeed(zone, fanSpeed)
lastSetTemp = curTemp
} else if 5 >= int(lastSetTemp)-int(curTemp) {
fmt.Printf("Decreasing fan speed to %d%%\n", int((fanSpeed/fanHighSpeed)*100))
updateFanSpeed(zone, fanSpeed)
lastSetTemp = curTemp
}
}
// Cache our last temp
lastTemp = curTemp
}
// Set zone 1 (0x01) to full speed (0x01).
func initializeFans() {
// Cooling profiles in BMC
// Standard: 0
// Full: 1
// Optimal: 2
// Heavy IO: 4
// We set to Full profile because the BMC seems to stop managing the fans
// unless there is a thermal violation in this mode, allowing us to fully
// control the fan profile
var profile = "0x01"
ipmiArgs := fmt.Sprintf("%s raw 0x30 0x45 0x01 %s", ipmitool, profile)
runIpmiTool(ipmiArgs)
}
// Unused function - show what our current fan profile is
func showCurrentFanProfile() {
ipmiArgs := fmt.Sprintf("%s raw 0x30 0x45 0x00", ipmitool)
runIpmiTool(ipmiArgs)
}
// Unused function - reset the BMC to clear all the things
func resetBmc() {
ipmiArgs := fmt.Sprintf("%s bmc reset cold", ipmitool)
runIpmiTool(ipmiArgs)
}
func main() {
initializeFans()
numSockets := getSocketCount()
fmt.Printf("Found %d CPU packages\n", numSockets)
for true {
curTemp := getMaxPackageTemp(numSockets)
fmt.Printf("Current hottest CPU at %dC\n", int(curTemp))
manageFans(curTemp)
time.Sleep(time.Second * 5)
}
}