我的应用程序中的某些操作使用的内存比我想象的要多,我想记录当前的内存使用情况,以帮助确定它们是什么。
系统调用是否会返回当前正在使用的内存量?
答案 0 :(得分:8)
以下C函数返回进程pid的CPU时间和驻留内存。要获取其他进程的资源,您需要root权限。您也可以尝试使用getrusage(),但我从来没有让它在内存使用方面正常工作。使用getrusage()获得CPU时间总是对我有用。
该功能改编自ps和top命令的源代码。它是我程序的一部分,用于监视其他进程的内存。
#ifdef __APPLE__
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <mach/mach_init.h>
#include <mach/mach_host.h>
#include <mach/mach_port.h>
#include <mach/mach_traps.h>
#include <mach/task_info.h>
#include <mach/thread_info.h>
#include <mach/thread_act.h>
#include <mach/vm_region.h>
#include <mach/vm_map.h>
#include <mach/task.h>
#include <mach/shared_memory_server.h>
typedef struct vmtotal vmtotal_t;
typedef struct { /* dynamic process information */
size_t rss, vsize;
double utime, stime;
} RunProcDyn;
/* On Mac OS X, the only way to get enough information is to become root. Pretty frustrating!*/
int run_get_dynamic_proc_info(pid_t pid, RunProcDyn *rpd)
{
task_t task;
kern_return_t error;
mach_msg_type_number_t count;
thread_array_t thread_table;
thread_basic_info_t thi;
thread_basic_info_data_t thi_data;
unsigned table_size;
struct task_basic_info ti;
error = task_for_pid(mach_task_self(), pid, &task);
if (error != KERN_SUCCESS) {
/* fprintf(stderr, "++ Probably you have to set suid or become root.\n"); */
rpd->rss = rpd->vsize = 0;
rpd->utime = rpd->stime = 0;
return 0;
}
count = TASK_BASIC_INFO_COUNT;
error = task_info(task, TASK_BASIC_INFO, (task_info_t)&ti, &count);
assert(error == KERN_SUCCESS);
{ /* adapted from ps/tasks.c */
vm_region_basic_info_data_64_t b_info;
vm_address_t address = GLOBAL_SHARED_TEXT_SEGMENT;
vm_size_t size;
mach_port_t object_name;
count = VM_REGION_BASIC_INFO_COUNT_64;
error = vm_region_64(task, &address, &size, VM_REGION_BASIC_INFO,
(vm_region_info_t)&b_info, &count, &object_name);
if (error == KERN_SUCCESS) {
if (b_info.reserved && size == (SHARED_TEXT_REGION_SIZE) &&
ti.virtual_size > (SHARED_TEXT_REGION_SIZE + SHARED_DATA_REGION_SIZE))
{
ti.virtual_size -= (SHARED_TEXT_REGION_SIZE + SHARED_DATA_REGION_SIZE);
}
}
rpd->rss = ti.resident_size;
rpd->vsize = ti.virtual_size;
}
{ /* calculate CPU times, adapted from top/libtop.c */
unsigned i;
rpd->utime = ti.user_time.seconds + ti.user_time.microseconds * 1e-6;
rpd->stime = ti.system_time.seconds + ti.system_time.microseconds * 1e-6;
error = task_threads(task, &thread_table, &table_size);
assert(error == KERN_SUCCESS);
thi = &thi_data;
for (i = 0; i != table_size; ++i) {
count = THREAD_BASIC_INFO_COUNT;
error = thread_info(thread_table[i], THREAD_BASIC_INFO, (thread_info_t)thi, &count);
assert(error == KERN_SUCCESS);
if ((thi->flags & TH_FLAGS_IDLE) == 0) {
rpd->utime += thi->user_time.seconds + thi->user_time.microseconds * 1e-6;
rpd->stime += thi->system_time.seconds + thi->system_time.microseconds * 1e-6;
}
if (task != mach_task_self()) {
error = mach_port_deallocate(mach_task_self(), thread_table[i]);
assert(error == KERN_SUCCESS);
}
}
error = vm_deallocate(mach_task_self(), (vm_offset_t)thread_table, table_size * sizeof(thread_array_t));
assert(error == KERN_SUCCESS);
}
mach_port_deallocate(mach_task_self(), task);
return 0;
}
#endif /* __APPLE__ */
答案 1 :(得分:2)
使用Instruments启动您的应用程序。把它放在一起,评估结果......
答案 2 :(得分:1)
您可以尝试mallocDebug
功能:http://developer.apple.com/mac/library/DOCUMENTATION/Performance/Conceptual/ManagingMemory/Articles/FindingPatterns.html。
答案 3 :(得分:1)
按照@ user172818建议,我尝试了getrusage
,它对我有用:
#include <sys/time.h>
#include <sys/resource.h>
long getMemoryUsage()
{
struct rusage usage;
if(0 == getrusage(RUSAGE_SELF, &usage))
return usage.ru_maxrss; // bytes
else
return 0;
}
我正在使用Mac OS X 10.9.4
,使用编译器Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
。