iOSで動作中のプロセスのメモリ使用量を調べる ref: http://qiita.com/ykst@github/items/a896b70815b6e76f7af0

file0.txt

#include <sys/proc_info.h>
#include <sys/sysctl.h>
#include <libproc.h>

void dump_process_memory_usage()
{
    size_t size = 0;
    // 全てのプロセスのPIDを取得
    int mib[4]  = { CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0 };
    sysctl(mib, 4, NULL, &size, NULL, 0);
    struct kinfo_proc *procs = malloc(size);
    sysctl(mib, 4, procs, &size, NULL, 0);

    int total = size / sizeof(*procs);

    for(int i = 0; i < total; ++i) {
        const pid_t pid = procs[i].kp_proc.p_pid;
        struct proc_taskallinfo tai;
        if(pid > 0) {
            proc_pidinfo(pid, PROC_PIDTASKALLINFO, 0, &tai, sizeof(tai));
            char buf[1024];
            bzero(buf, 1024);
            proc_pidpath(pid, buf, sizeof(buf));
            // ついでにsysctlでは取れないフルのプロセス名を取得
            NSString *full_process_name = [[[NSString stringWithCString:buf encoding:NSUTF8StringEncoding] lastPathComponent] stringByDeletingPathExtension];
            NSLog(@"%@ uses %.2fMB(PID:%d)", full_process_name, tai.ptinfo.pti_resident_size / 1000000.0f);
        }
    }
}

libproc_wrapper.h

#ifndef _LIBPROC_WRAPPER_H_
#define _LIBPROC_WRAPPER_H_
#if TARGET_IPHONE_SIMULATOR
#include <sys/proc_info.h>
#include <libproc.h>
#else
extern int  proc_listpidspath(uint32_t  type,
    uint32_t    typeinfo,
    const char  *path,
    uint32_t    pathflags,
    void        *buffer,
    int     buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);

extern int proc_listpids(uint32_t type, uint32_t typeinfo, void *buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
extern int proc_listallpids(void * buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_1);
extern int proc_listpgrppids(pid_t pgrpid, void * buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_1);
extern int proc_listchildpids(pid_t ppid, void * buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_1);
extern int proc_pidinfo(int pid, int flavor, uint64_t arg,  void *buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
extern int proc_pidfdinfo(int pid, int fd, int flavor, void * buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
extern int proc_pidfileportinfo(int pid, uint32_t fileport, int flavor, void *buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
extern int proc_name(int pid, void * buffer, uint32_t buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
extern int proc_regionfilename(int pid, uint64_t address, void * buffer, uint32_t buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
extern int proc_kmsgbuf(void * buffer, uint32_t buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
extern int proc_pidpath(int pid, void * buffer, uint32_t  buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
extern int proc_libversion(int *major, int * minor) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);

#define PROC_SETPC_NONE     0
#define PROC_SETPC_THROTTLEMEM  1
#define PROC_SETPC_SUSPEND  2
#define PROC_SETPC_TERMINATE    3
#define MAXCOMLEN 16

#define PROC_PIDTASKALLINFO     2
#define PROC_PIDTASKALLINFO_SIZE    (sizeof(struct proc_taskallinfo))

extern int proc_setpcontrol(const int control) __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_3_2);
extern int proc_setpcontrol(const int control);
extern int proc_track_dirty(pid_t pid, uint32_t flags);
extern int proc_set_dirty(pid_t pid, bool dirty);
extern int proc_get_dirty(pid_t pid, uint32_t *flags);
extern int proc_terminate(pid_t pid, int *sig);

struct proc_bsdinfo {
    uint32_t        pbi_flags;      /* 64bit; emulated etc */
    uint32_t        pbi_status;
    uint32_t        pbi_xstatus;
    uint32_t        pbi_pid;
    uint32_t        pbi_ppid;
    uid_t           pbi_uid;
    gid_t           pbi_gid;
    uid_t           pbi_ruid;
    gid_t           pbi_rgid;
    uid_t           pbi_svuid;
    gid_t           pbi_svgid;
    uint32_t        rfu_1;          /* reserved */
    char            pbi_comm[MAXCOMLEN];
    char            pbi_name[2*MAXCOMLEN];  /* empty if no name is registered */
    uint32_t        pbi_nfiles;
    uint32_t        pbi_pgid;
    uint32_t        pbi_pjobc;
    uint32_t        e_tdev;         /* controlling tty dev */
    uint32_t        e_tpgid;        /* tty process group id */
    int32_t         pbi_nice;
    uint64_t        pbi_start_tvsec;
    uint64_t        pbi_start_tvusec;
};

struct proc_taskinfo {
    uint64_t        pti_virtual_size;   /* virtual memory size (bytes) */
    uint64_t        pti_resident_size;  /* resident memory size (bytes) */
    uint64_t        pti_total_user;     /* total time */
    uint64_t        pti_total_system;
    uint64_t        pti_threads_user;   /* existing threads only */
    uint64_t        pti_threads_system;
    int32_t         pti_policy;     /* default policy for new threads */
    int32_t         pti_faults;     /* number of page faults */
    int32_t         pti_pageins;        /* number of actual pageins */
    int32_t         pti_cow_faults;     /* number of copy-on-write faults */
    int32_t         pti_messages_sent;  /* number of messages sent */
    int32_t         pti_messages_received;  /* number of messages received */
    int32_t         pti_syscalls_mach;  /* number of mach system calls */
    int32_t         pti_syscalls_unix;  /* number of unix system calls */
    int32_t         pti_csw;            /* number of context switches */
    int32_t         pti_threadnum;      /* number of threads in the task */
    int32_t         pti_numrunning;     /* number of running threads */
    int32_t         pti_priority;       /* task priority*/
};

struct proc_taskallinfo {
    struct proc_bsdinfo pbsd;
    struct proc_taskinfo    ptinfo;
};

#endif
#endif