system: add option to only use pcores

Resolves #2557
utmapp · Jul 10, 2021 · 20846c5 · 20846c5
1 parent c33f1ee
commit 20846c5
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Showing 2 changed files with 19 additions and 1 deletion.
diff --git a/Managers/UTMQemuSystem.m b/Managers/UTMQemuSystem.m
@@ -132,6 +132,10 @@ - (CPUCount)emulatedCpuCount {
         return singleCpu;
     }
 #if defined(__aarch64__)
+    CPUCount hostPcoreCount = {
+        .cpus = sysctl_read("hw.perflevel0.physicalcpu"),
+        .threads = sysctl_read("hw.perflevel0.logicalcpu"),
+    };
     // in ARM we can only emulate other weak architectures
     if ([arch isEqualToString:@"alpha"] ||
         [arch isEqualToString:@"arm"] ||
@@ -141,7 +145,11 @@ - (CPUCount)emulatedCpuCount {
         [arch hasPrefix:@"ppc"] ||
         [arch hasPrefix:@"riscv"] ||
         [arch hasPrefix:@"xtensa"]) {
-        return hostCount;
+        if (self.useOnlyPcores && hostPcoreCount.cpus > 0) {
+            return hostPcoreCount;
+        } else {
+            return hostCount;
+        }
     } else {
         return singleCpu;
     }
@@ -503,6 +511,11 @@ - (BOOL)useHypervisor {
 #endif
 }
 
+- (BOOL)useOnlyPcores {
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+    return [defaults boolForKey:@"UseOnlyPcores"];
+}
+
 - (BOOL)hasCustomBios {
     for (NSUInteger i = 0; i < self.configuration.countDrives; i++) {
         UTMDiskImageType type = [self.configuration driveImageTypeForIndex:i];

diff --git a/Platform/macOS/SettingsView.swift b/Platform/macOS/SettingsView.swift
@@ -23,6 +23,7 @@ struct SettingsView: View {
     @AppStorage("NoHypervisor") var isNoHypervisor = false
     @AppStorage("CtrlRightClick") var isCtrlRightClick = false
     @AppStorage("NoUsbPrompt") var isNoUsbPrompt = false
+    @AppStorage("UseOnlyPcores") var isUseOnlyPcores = false
 
     var body: some View {
         Form {
@@ -38,6 +39,9 @@ struct SettingsView: View {
                 Toggle(isOn: $isNoHypervisor, label: {
                     Text("Force slower emulation even when hypervisor is available")
                 })
+                Toggle(isOn: $isUseOnlyPcores, label: {
+                    Text("Use only performance cores by default")
+                })
             }
             Section(header: Text("Input")) {
                 Toggle(isOn: $isCtrlRightClick, label: {
@@ -60,6 +64,7 @@ extension UserDefaults {
     @objc dynamic var NoHypervisor: Bool { false }
     @objc dynamic var CtrlRightClick: Bool { false }
     @objc dynamic var NoUsbPrompt: Bool { false }
+    @objc dynamic var UseOnlyPcores: Bool { false }
 }
 
 @available(macOS 11, *)