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<title>Process Time: Libgtop Reference Manual</title>
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Description
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Process Time
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Process Time — Get process time information
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Stability Level
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Stable, unless otherwise indicated
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Functions
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void
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glibtop_get_proc_time ()
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Types and Values
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struct
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glibtop_proc_time
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Includes
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#include <glibtop/proctime.h>
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Description
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Functions
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glibtop_get_proc_time ()
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void
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glibtop_get_proc_time (glibtop_proc_time *buf,
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pid_t pid);
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Get process time information.
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Parameters
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buf
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Returned process time information - see glibtop_proc_time.
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pid
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Process id
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Types and Values
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struct glibtop_proc_time
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struct glibtop_proc_time {
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guint64 start_time;
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guint64 rtime;
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guint64 utime;
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guint64 stime;
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guint64 cutime;
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guint64 cstime;
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guint64 timeout;
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guint64 it_real_value;
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guint64 frequency;
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guint64 xcpu_utime [GLIBTOP_NCPU];
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guint64 xcpu_stime [GLIBTOP_NCPU];
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};
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Process time data filled by glibtop_get_proc_time().
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Under Linux the start_time
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value may be wrong due to the information
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available from the kernel.
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The Linux kernel defines INITIAL_JIFFIES which implies a time
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shift. Because INITIAL_JIFFIES is not user-space defined,
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we cannot use it to compute an accurate start_time
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. On Linux 2.6,
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INITIAL_JIFFIES is 300 so start_time is
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always 3s different from the real start time of the given process. You
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may also get shift results if your system clock is not synchronised
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with your hardware clock. See man hwclock.
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Members
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guint64 start_time;
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Start time of process in seconds since the epoch.
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guint64 rtime;
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Real time accumulated by process (should be utime
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+ stime
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).
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guint64 utime;
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User-mode CPU time accumulated by process.
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guint64 stime;
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Kernel-mode CPU time accumulated by process.
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guint64 cutime;
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Cumulative utime of process and reaped children.
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guint64 cstime;
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Cumulative stime of process and reaped children.
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guint64 timeout;
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The time (in jiffies) of the process’s next timeout.
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guint64 it_real_value;
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The time (in jiffies) before the next SIGALRM
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is sent to the process due to an interval timer.
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guint64 frequency;
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Tick frequency.
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guint64 xcpu_utime[GLIBTOP_NCPU];
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SMP user-mode CPU time accumulated by process.
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guint64 xcpu_stime[GLIBTOP_NCPU];
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SMP kernel-mode CPU time accumulated by process
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