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iOS 获取APP的CPU、内存等信息

2015-11-19 15:25 555 查看
目标是开发一个SDK,嵌入到APP里面,用来统计当前APP的实时CPU、内存等信息

2015.11.17

http://stackoverflow.com/questions/12889422/ios-cpu-usage-for-each-process-using-sysctl

这是第一个找到,采用的是sysctl函数

但是出来的CPU数据和instrument、GT的数据对不上(后两者数据比较接近)

2015.11.19
https://github.com/TianJIANG/ios_monitor
从guithub上搜到的,利用的主要是#import <mach/mach.h> 里面的task_info 等,打开了一道新的大门,后续找到不少类似的方法
http://stackoverflow.com/questions/8223348/ios-get-cpu-usage-from-application
这个答案也是给的这个方法,末尾额外加了一行代码, vm_dealloc,解决leaking问题

补充几个相关的:
http://stackoverflow.com/questions/5182924/where-is-my-ipad-runtime-memory-going%E2%80%8C%E2%80%8B http://blog.sina.com.cn/s/blog_693de6100101ffwm.html http://www.zhihu.com/question/22992491
Github 搜 “Activity Monitor”
https://github.com/AndrewBarba/ActivityMonitor https://github.com/vsnrain/ActivityMonitor
此算法是获取当前APP的CPU,数值与Instrument、GT接近

- (void)GetCpuUsage {
kern_return_t kr;
task_info_data_t tinfo;
mach_msg_type_number_t task_info_count;

task_info_count = TASK_INFO_MAX;
kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count);
if (kr != KERN_SUCCESS) {
return;
}

task_basic_info_t      basic_info;
thread_array_t         thread_list;
mach_msg_type_number_t thread_count;

thread_info_data_t     thinfo;
mach_msg_type_number_t thread_info_count;

thread_basic_info_t basic_info_th;
uint32_t stat_thread = 0; // Mach threads

basic_info = (task_basic_info_t)tinfo;

// get threads in the task
kr = task_threads(mach_task_self(), &thread_list, &thread_count);
if (kr != KERN_SUCCESS) {
return;
}
if (thread_count > 0)
stat_thread += thread_count;

long tot_sec = 0;
long tot_usec = 0;
float tot_cpu = 0;
int j;

for (j = 0; j < thread_count; j++)
{
thread_info_count = THREAD_INFO_MAX;
kr = thread_info(thread_list[j], THREAD_BASIC_INFO,
(thread_info_t)thinfo, &thread_info_count);
if (kr != KERN_SUCCESS) {
return;
}

basic_info_th = (thread_basic_info_t)thinfo;

if (!(basic_info_th->flags & TH_FLAGS_IDLE)) {
tot_sec = tot_sec + basic_info_th->user_time.seconds + basic_info_th->system_time.seconds;
tot_usec = tot_usec + basic_info_th->system_time.microseconds + basic_info_th->system_time.microseconds;
tot_cpu = tot_cpu + basic_info_th->cpu_usage / (float)TH_USAGE_SCALE * 100.0;
}

} // for each thread

kr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t));
assert(kr == KERN_SUCCESS);

NSLog(@"CPU Usage: %f \n", tot_cpu);
}


此算法是获取当前APP的内存,数值与GT的一致,与Instrument不一致

- (void)GetCurrentTaskUsedMemory {
task_basic_info_data_t taskInfo;
mach_msg_type_number_t infoCount = TASK_BASIC_INFO_COUNT;
kern_return_t kernReturn = task_info(mach_task_self(),
TASK_BASIC_INFO, (task_info_t)&taskInfo, &infoCount);

if(kernReturn != KERN_SUCCESS) {
return;
}

NSLog(@"Memory Usage: %f", taskInfo.resident_size / 1024.0 / 1024.0);
}


2015.11.20

XNU
https://en.wikipedia.org/wiki/XNU
MACH
https://en.wikipedia.org/wiki/Mach_(kernel)
Kernel Programming Guide
https://developer.apple.com/library/mac/documentation/Darwin/Conceptual/KernelProgramming/About/About.html
github 上搜 mach_msg_type_number_t
https://github.com/search?l=objective-c&q=mach_msg_type_number_t&type=Code&utf8=✓
2015.11.22

用VM Tracker查看内存,有那么几项

Resident Size|Dirty Size|Virtual Size
http://stackoverflow.com/questions/5176074/what-do-dirty-and-resident-mean-in-relation-to-virtual-memory
这篇解释了三者的差别,我理解我们应该跟踪的是Resident Size,但是数值上与VM Tracker上对不上

- (void)GetMemoryStatistics {

// Get Page Size
int mib[2];
int page_size;
size_t len;

mib[0] = CTL_HW;
mib[1] = HW_PAGESIZE;
len = sizeof(page_size);

//    // 方法一: 16384
//    int status = sysctl(mib, 2, &page_size, &len, NULL, 0);
//    if (status < 0) {
//        perror("Failed to get page size");
//    }
//    // 方法二: 16384
//    page_size = getpagesize();
// 方法三: 4096
if( host_page_size(mach_host_self(), &page_size)!= KERN_SUCCESS ){
perror("Failed to get page size");
}
printf("Page size is %d bytes\n", page_size);

// Get Memory Size
mib[0] = CTL_HW;
mib[1] = HW_MEMSIZE;
long ram;
len = sizeof(ram);
if (sysctl(mib, 2, &ram, &len, NULL, 0)) {
perror("Failed to get ram size");
}
printf("Ram size is %f MB\n", ram / (1024.0) / (1024.0));

// Get Memory Statistics
//    vm_statistics_data_t vm_stats;
//    mach_msg_type_number_t info_count = HOST_VM_INFO_COUNT;
vm_statistics64_data_t vm_stats;
mach_msg_type_number_t info_count64 = HOST_VM_INFO64_COUNT;
//    kern_return_t kern_return = host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vm_stats, &info_count);
kern_return_t kern_return = host_statistics64(mach_host_self(), HOST_VM_INFO64, (host_info64_t)&vm_stats, &info_count64);
if (kern_return != KERN_SUCCESS) {
printf("Failed to get VM statistics!");
}

double vm_total = vm_stats.wire_count + vm_stats.active_count + vm_stats.inactive_count + vm_stats.free_count;
double vm_wire = vm_stats.wire_count;
double vm_active = vm_stats.active_count;
double vm_inactive = vm_stats.inactive_count;
double vm_free = vm_stats.free_count;
double unit = (1024.0) * (1024.0);

NSLog(@"Total Memory: %f", vm_total * page_size / unit);
NSLog(@"Wired Memory: %f", vm_wire * page_size / unit);
NSLog(@"Active Memory: %f", vm_active * page_size / unit);
NSLog(@"Inactive Memory: %f", vm_inactive * page_size / unit);
NSLog(@"Free Memory: %f", vm_free * page_size / unit);
}


1、关于Ram大小,用HW_MEMSIZE计算得到1000MB,是准确的

2、关于page size,上面提供了三种方法

其中方法一、二在64位机器上返回了16384,只有第三种方法返回了4096
http://stackoverflow.com/questions/21552747/strange-behavior-on-64bit-ios-devices-when-retrieving-vm-statistics/33574804#33574804
这篇文章提出了此疑问,但是没有特别明确的解释

我认为page size应该是4096,用VM Tracker运行,截图如下:



以第一项_LINKEDIT为例,13692*4096/1024/1024=53.48M,与Vitual Size吻合

3、关于vm_total、vm_wire、vm_active、vm_inactive、vm_free这几个值

其中一组运行结果如下:

Page size is 4096 bytes
Ram size is 1000.000000 MB
2015-11-22 20:59:41.191 CompSDKDemo[1602:410503] Total Memory: 777.519531
2015-11-22 20:59:41.191 CompSDKDemo[1602:410503] Wired Memory: 205.484375
2015-11-22 20:59:41.192 CompSDKDemo[1602:410503] Active Memory: 374.941406
2015-11-22 20:59:41.192 CompSDKDemo[1602:410503] Inactive Memory: 175.710938
2015-11-22 20:59:41.192 CompSDKDemo[1602:410503] Free Memory: 21.382812


可以看到,Total Memory不是1000MB,这个如何解释呢?

a. 1000M应该是实际的RAM大小,而Total Memory,应该是Virtual Memory,两者是否一回事,有待商榷?

b. 从APP Store上下了一个System Monitor,如下:

可以看到,Wired、Active、Inactive的值都对得上,唯独Free的值对不上

不负责任的猜测,他的Free是通过1000M减其它三项得到的



Source Code : Get Hardware Info of iPhone
http://blog.sina.com.cn/s/blog_4a04a3c90100r9gn.html
How to determine CPU and memory consumption from inside a process?
http://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process
总结下来,关于内存的有两个问题:

1. active、inactive、wired、free加起来不等于1000M

  这个可以先放一放,我们可以先不用管这部分

2. 当前app消耗的内存,目前的算法与 Debug Gauges的值有偏差,与GT吻合

  不过发现点击页面增长的值和发回释放的值,与Debug Gauges基本一致,因此可以使用

关于CPU,上面算法给出的值符合要求,可以使用;

接下来是:耗电量、网速、帧率

2015.11.23

耗电量,目前没有找到合适的工具

有两种获取电池电量信息的方法

方法一:

这个方法需要导入 IOKit 库,但是不知从什么时候开始,iOS系统不允许用户导入库
http://www.cocoachina.com/bbs/read.php?tid=268692
这篇文章提供了野路子方法,但是实施起来颇为不便,考虑到要做sdk,不适合

CFTypeRef blob = IOPSCopyPowerSourcesInfo();
CFArrayRef sources = IOPSCopyPowerSourcesList(blob);


方法二:

[UIDevice currentDevice].batteryLevel


据说精度达到1%

找到一篇文章,提供了三种方法

iOS开发之runtime精准获取电池电量
http://www.jianshu.com/p/11c1afdf5415
网络流量
https://github.com/QbsuranAlang/GetNetworkFlow/blob/master/GetNetworkFlow/GetNetworkFlow/ViewController.m
2015.11.24

经测试,mach方法获取的内存值与top命令拿到的RSS、VSS是一致的
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