获取CPU使用百分比

我是Objective-C的初学者，我决定尝试编写一些简单的应用程序，所以我正在尝试制作一个可以衡量CPU使用率等的应用程序。 是否有一种简单的方法来获取信息，如在Cocoa应用程序中使用Objective-C的CPU百分比使用情况？

我发现这个问题确定过程信息在Darwin / OSX中以编程方式相似，但不完全相同。 主要是我想要整个系统的CPU百分比使用率，而不仅仅是我的过程，实际上我更喜欢一个Objective-C解决scheme，而在这个问题上，海报需要别的东西。

Answer 1

这是我做的方式：

* .h文件：

 #include <sys/sysctl.h> #include <sys/types.h> #include <mach/mach.h> #include <mach/processor_info.h> #include <mach/mach_host.h> 

高德：

 processor_info_array_t cpuInfo, prevCpuInfo; mach_msg_type_number_t numCpuInfo, numPrevCpuInfo; unsigned numCPUs; NSTimer *updateTimer; NSLock *CPUUsageLock; 

* .m文件

 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { int mib[2U] = { CTL_HW, HW_NCPU }; size_t sizeOfNumCPUs = sizeof(numCPUs); int status = sysctl(mib, 2U, &numCPUs, &sizeOfNumCPUs, NULL, 0U); if(status) numCPUs = 1; CPUUsageLock = [[NSLock alloc] init]; updateTimer = [[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(updateInfo:) userInfo:nil repeats:YES] retain]; } - (void)updateInfo:(NSTimer *)timer { natural_t numCPUsU = 0U; kern_return_t err = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &numCPUsU, &cpuInfo, &numCpuInfo); if(err == KERN_SUCCESS) { [CPUUsageLock lock]; for(unsigned i = 0U; i < numCPUs; ++i) { float inUse, total; if(prevCpuInfo) { inUse = ( (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER] - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER]) + (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM]) + (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE] - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE]) ); total = inUse + (cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE] - prevCpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE]); } else { inUse = cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_USER] + cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_SYSTEM] + cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_NICE]; total = inUse + cpuInfo[(CPU_STATE_MAX * i) + CPU_STATE_IDLE]; } NSLog(@"Core: %u Usage: %f",i,inUse / total); } [CPUUsageLock unlock]; if(prevCpuInfo) { size_t prevCpuInfoSize = sizeof(integer_t) * numPrevCpuInfo; vm_deallocate(mach_task_self(), (vm_address_t)prevCpuInfo, prevCpuInfoSize); } prevCpuInfo = cpuInfo; numPrevCpuInfo = numCpuInfo; cpuInfo = NULL; numCpuInfo = 0U; } else { NSLog(@"Error!"); [NSApp terminate:nil]; } }