NAME
lat_proc - process creation tests
SYNOPSIS
lat_proc [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] procedure|fork|exec|shell
DESCRIPTION
lat_proc creates processes in three different forms, each more expensive than the last. The purposes is to measure the time that it takes to create a basic thread of control.
The forms are listed and described below:
|
Process fork+exit |
The time it takes to split a process into two (nearly) identical copies and have one exit. This is how new processes are created but is not very useful since both processes are doing the same thing. | ||
|
Process fork+execve |
The time it takes to create a new process and have that new process run a new program. This is the inner loop of all shells (command interpreters). |
Process fork+/bin/sh -c
The time it takes to create a new process and have that new process run a new program by asking the system shell to find that program and run it. This is how the C library interface called system is implemented. It is the most general and the most expensive.
OUTPUT
Output is in microseconds per operation like so:
Process
fork+exit: 6054 microseconds
Process fork+execve: 11212 microseconds
Process fork+/bin/sh -c: 44346 microseconds
ACKNOWLEDGEMENT
Funding for the development of this tool was provided by Sun Microsystems Computer Corporation.
SEE ALSO
AUTHOR
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.