process identifier

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process identifier

(operating system)
(PID) An integer used by the Unix kernel to uniquely identify a process. PIDs are returned by the fork system call and can be passed to wait() or kill() to perform actions on the given process.
References in periodicals archive ?
Several important system calls Name of Function system call Fork Create a new process Clone Create a child process according to specific conditions Getpid Obtain the id of a process Fcntl File control Read Read file Write Write file Ioctl Master control function of I/O Table 2.
Many system calls, for example getpid (), are always performed on the processe's current node and have no remote performance degradation.
The microbenchmark results present the user-perceived run times (measured as wall-clock times) for the open, close, stat, read, write, and getpid system calls.
The standard deviation for the five runs was below 2% for all tests, except for getpid, for which the standard deviation was at most 6%.
Basic naming was provided by a special purpose GetPid function which mapped logical process identifiers to actual process identifiers using broadcast.
As DTSTM needs to intercept system calls, the performance overhead of getpid test program is relatively high.