ACCT(F) XENIX System V ACCT(F)
Name
acct - Format of per-process accounting file.
Description
Files produced as a result of calling acct(S) have records
in the form defined by <sys/acct.h>.
In ac_flag, the AFORK flag is turned on by each fork(S) and
turned off by an exec(S). The ac_comm field is inherited
from the parent process and is reset by any exec. Each time
the system charges the process with a clock tick, it also
adds the current process size to ac_mem computed as follows:
(data size) + (text size) / (number of in-core
processes using text)
The value of ac_mem/ac_stime can be viewed as an
approximation to the mean process size, as modified by
text-sharing.
See Also
acct(C), acctcom(C), acct(S)
Notes
The ac_mem value for a short-lived command gives little
information about the actual size of the command, because
ac_mem may be incremented while a different command (e.g.,
the shell) is being executed by the process.
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