06-05-2009
Quote:
Yes we are. Rating threads helps search our Google site map algorithm to prioritize which threads are top priority to spider. In turn, this helps insure higher rated threads are visible when users search for information.
Google knows what to do with those? Is that a rel tag or something?
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LEARN ABOUT DEBIAN
pi_stress
pi_stress(8) Linux System Administrator's Manual pi_stress(8)
NAME
pi_stress - a stress test for POSIX Priority Inheritance mutexes
SYNOPSIS
pi_stress [-i|--inversions inversions] [-t|--duration seconds] [-g|--groups groups [-d|--debug] [-v|--verbose] [-s|--signal] [-r|--rr]
[-p|--prompt] [-m|--mlockall] [-u|--uniprocessor]
pi_stress -h|--help
DESCRIPTION
pi_stress is a program used to stress the priority-inheritance code paths for POSIX mutexes, in both the Linux kernel and the C library. It
runs as a realtime-priority task and launches inversion machine thread groups. Each inversion group causes a priorty inversion condition
that will deadlock if priority inheritance doesn't work.
OPTIONS
-i n|--inversions=n
Run for n number of inversion conditions. This is the total number of inversions for all inversion groups. Default is -1 for infi-
nite.
-t n|--duration=n
Run the test for n seconds and then terminate.
-g n|--groups=n
The number of inversion groups to run. Defaults to 10.
-d|--debug
Run in debug mode; lots of extra prints
-v|--verbose
Run with verbose messages
-s|--signal
Terminate on receipt of SIGTERM (Ctrl-C). Default is to terminate on any keypress.
-r|--rr
Run inversion group threads as SCHED_RR (round-robin). The default is to run the inversion threads as SCHED_FIFO.
-p|--prompt
Prompt before actually starting the stress test
-u|--uniprocessor
Run all threads on one processor. The default is to run all inversion group threads on one processor and the admin threads (report-
ing thread, keyboard reader, etc.) on a different processor.
-m|--mlockall
Call mlockall to lock current and future memory allocations and prevent being paged out
-h|--help
Display a short help message and options.
CAVEATS
The pi_stress test threads run as SCHED_FIFO or SCHED_RR threads, which means that they can starve critical system threads. It is advisable
to change the scheduling policy of critical system threads to be SCHED_FIFO prior to running pi_stress and use a priority of 10 or higher,
to prevent those threads from being starved by the stress test.
BUGS
No documented bugs.
AUTHOR
Clark Williams <williams@redhat.com>
Nov 27, 2006 pi_stress(8)