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- GETRUSAGE(2) UNIX Programmer's Manual GETRUSAGE(2)
-
- NNAAMMEE
- ggeettrruussaaggee - get information about resource utilization
-
- SSYYNNOOPPSSIISS
- ##iinncclluuddee <<ssyyss//ttiimmee..hh>>
- ##iinncclluuddee <<ssyyss//rreessoouurrccee..hh>>
- ##ddeeffiinnee RRUUSSAAGGEE__SSEELLFF 00
- ##ddeeffiinnee RRUUSSAAGGEE__CCHHIILLDDRREENN 11
-
- _i_n_t
- ggeettrruussaaggee(_i_n_t _w_h_o, _s_t_r_u_c_t _r_u_s_a_g_e _*_r_u_s_a_g_e)
-
- DDEESSCCRRIIPPTTIIOONN
- GGeettrruussaaggee() returns information describing the resources utilized by the
- current process, or all its terminated child processes. The _w_h_o parame
- ter is either RUSAGE_SELF or RUSAGE_CHILDREN. The buffer to which _r_u_s_a_g_e
- points will be filled in with the following structure:
-
- struct rusage {
- struct timeval ru_utime; /* user time used */
- struct timeval ru_stime; /* system time used */
- long ru_maxrss; /* integral max resident set size */
- long ru_ixrss; /* integral shared text memory size */
- long ru_idrss; /* integral unshared data size */
- long ru_isrss; /* integral unshared stack size */
- long ru_minflt; /* page reclaims */
- long ru_majflt; /* page faults */
- long ru_nswap; /* swaps */
- long ru_inblock; /* block input operations */
- long ru_oublock; /* block output operations */
- long ru_msgsnd; /* messages sent */
- long ru_msgrcv; /* messages received */
- long ru_nsignals; /* signals received */
- long ru_nvcsw; /* voluntary context switches */
- long ru_nivcsw; /* involuntary context switches */
- };
-
- The fields are interpreted as follows:
-
- _r_u___u_t_i_m_e the total amount of time spent executing in user mode.
-
- _r_u___s_t_i_m_e the total amount of time spent in the system executing on
- behalf of the process(es).
-
- _r_u___m_a_x_r_s_s the maximum resident set size utilized (in kilobytes).
-
- _r_u___i_x_r_s_s an integral value indicating the amount of memory used by
- the text segment that was also shared among other processes.
- This value is expressed in units of kilobytes * ticksof
- execution.
-
- _r_u___i_d_r_s_s an integral value of the amount of unshared memory residing
- in the data segment of a process (expressed in units of
- kilobytes * ticksofexecution).
-
- _r_u___i_s_r_s_s an integral value of the amount of unshared memory residing
- in the stack segment of a process (expressed in units of
- kilobytes * ticksofexecution).
-
- _r_u___m_i_n_f_l_t the number of page faults serviced without any I/O activity;
- here I/O activity is avoided by reclaiming a page frame from
-
- the list of pages awaiting reallocation.
-
- _r_u___m_a_j_f_l_t the number of page faults serviced that required I/O activi
- ty.
-
- _r_u___n_s_w_a_p the number of times a process was swapped out of main memo
- ry.
-
- _r_u___i_n_b_l_o_c_k the number of times the file system had to perform input.
-
- _r_u___o_u_b_l_o_c_k the number of times the file system had to perform output.
-
- _r_u___m_s_g_s_n_d the number of IPC messages sent.
-
- _r_u___m_s_g_r_c_v the number of IPC messages received.
-
- _r_u___n_s_i_g_n_a_l_s the number of signals delivered.
-
- _r_u___n_v_c_s_w the number of times a context switch resulted due to a pro
- cess voluntarily giving up the processor before its time
- slice was completed (usually to await availability of a re
- source).
-
- _r_u___n_i_v_c_s_w the number of times a context switch resulted due to a high
- er priority process becoming runnable or because the current
- process exceeded its time slice.
-
- NNOOTTEESS
- The numbers _r_u___i_n_b_l_o_c_k and _r_u___o_u_b_l_o_c_k account only for real I/O; data
- supplied by the caching mechanism is charged only to the first process to
- read or write the data.
-
- EERRRROORRSS
- GGeettrruussaaggee() returns 1 on error. The possible errors are:
-
- [EINVAL] The _w_h_o parameter is not a valid value.
-
- [EFAULT] The address specified by the _r_u_s_a_g_e parameter is not in a
- valid part of the process address space.
-
- SSEEEE AALLSSOO
- gettimeofday(2), wait(2)
-
- BBUUGGSS
- There is no way to obtain information about a child process that has not
- yet terminated.
-
- HHIISSTTOORRYY
- The ggeettrruussaaggee function call appeared in 4.2BSD.
-
- 4th Berkeley Distribution March 10, 1991 2
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