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fix: bogoflops counter being overestimated on M4 Mac due to Math.random() reliance

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minjaesong
2025-11-27 10:41:13 +09:00
parent 767aa09a17
commit e14e689dce
4 changed files with 63 additions and 23 deletions
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32
src/net/torvald/terrarum/App.java
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@@ -343,7 +343,6 @@ public class App implements ApplicationListener {
public static InputStrober inputStrober;
public static long bogoflops = 0L;
private static double bogoflopf = Math.random();
public static boolean hasUpdate = true;
@@ -362,20 +361,33 @@ public class App implements ApplicationListener {
public static long loadedTime_t;
public static void main(String[] args) {
loadedTime_t = getTIME_T();
public static void updateBogoflops(long iteration) {
long iters = 0;
double a = 1.000001;
double b = 1.000002;
double c = 1.000003;
long st = System.nanoTime();
long sc = st;
while (sc - st < 100000000L) {
bogoflopf = Math.random() * bogoflopf;
bogoflops++;
while (sc - st < iteration) {
// burn ALU cycles
a = a * b + c;
b = b * c + a;
c = c * a + b;
iters += 3; // roughly count flops
sc = System.nanoTime();
}
bogoflops = Math.round((double)(bogoflops) * (1000000000.0 / (sc - st)));
// System.out.println(sc - st);
// System.out.println(bogoflops);
// divide by 4 to make it roughly match up with the old calibrated worldgen estimator
bogoflops = Math.round((iters * (1e9 / (sc - st))) / 4);
}
public static void main(String[] args) {
loadedTime_t = getTIME_T();
updateBogoflops(100_000_000L);
// if -ea flag is set, turn on all the debug prints
try {