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Old 12-29-2008
Siege 2.68b4 (Beta branch)
Siege is a regression test and benchmark utility. It can stress test a single URL with a user defined number of simulated users, or it can read many URLs into memory and stress them simultaneously. The program reports the total number of hits recorded, bytes transferred, response time, concurrency, and return status. Siege supports HTTP/1.0 and 1.1 protocols, GET and POST directives, cookies, transaction logging, and basic authentication. Its features are configurable on a per user basis. License: GNU General Public License (GPL)Changes:
This release fixes a problem in which some threads could hang while waiting for a read.Image

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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)