Mac OS X specific notes

*** Instructions before Starting libMicro ***

# Disable Open directory and LDAP using Directory Utility app
# Turn off airport
# Turn off spotlight. In terminal, execute the following:
  sudo service com.apple.metadata.mds stop
# Turn off Time Machine in System Preferences
# Wait at least 2 minutes after boot to desktop for boot cache to settle down
   
*** Make and run quickstart ***

	make
	./bench >output.txt
gives you a text file named output.txt with the results of one run.
	./multiview output1.txt output2.txt >compare.html
gives you a html file comparing two runs.

*** Makefile ***

The Makefile invokes Makefile.Darwin which invokes Makefile.com.Darwin.
Just invoke make, with options if necessary, and everything should
build correctly. The binaries are placed in a directory called
bin-ARCH where ARCH is the default or specified when building via
the ARCH flag.

options for invoking Makefile are:
ARCH 		defaults to  i386
	if you just want to build for ppc, you can specify
		make ARCH=ppc
	this will put the results in bin-ppc

        to build fat/multi architecture, specify 
		make ARCH=fat
	the makefile will automatically build with ARCH_FLAG="-arch ppc -arch i386 -arch x86_64" and put the results in bin-fat

	to build with only two of the architectures see below

ARCH_FLAG 	defaults to -arch $(ARCH)
	to build fat/multi architecture, specify 
		make ARCH_FLAG="-arch ppc -arch i386" ARCH=fat
	this will put the results in bin-fat

OPT_FLAG 	defaults to  -g
	to build optimized, specify make OPT_FLAG=-s

SEMOP_FLAG 	defaults to  -DUSE_SEMOP
	to eliminate SEMOP usage, specify make SEMOP_FLAG=
	this is needed on some lower-end systems (e.g. M63)

These can be combined, e.g.
	make ARCH=ppc SEMOP_FLAG=

*** Before running benchmarks ***

The shell script create_stuff should be run before any benchmarking

this script takes care of raising the process limits which would
otherwise cause several of the tests to fail - if not you will see:
	Running:           pipe_pst1
	fork: Resource temporarily unavailable
in your stderr during the runs. After you run create_stuff, the
system then needs to be rebooted.

*** running the benchmarks ***

The shell script "bench" will run all the benchmarks, or you can
pass it a parameter to run a single benchmark, e.g.

	bench lmbench_bw_unix

Watch for:
	# WARNINGS
	#     Quantization error likely;increase batch size (-B option) 4X to avoid.
in the output
To see an example run the supplied testbench script

Add or adjust the -B parameter for any benchmark that fails. The
Quantization error will refer to the benchmark preceding the error,
not the one following...

A typical run:
	$ make clean
	$ make
	$ ./create_stuff
	$ ./bench > output1
	Running:              getpid
	 for      0.13353 seconds
	Running:             getppid
	 for      3.65609 seconds
	Running:              getenv
	 for      0.20924 seconds
	Running:            getenvT2
	 for      0.37437 seconds
	Running:        gettimeofday
	 for      0.58077 seconds
	etc...

Use the supplied multiview script to compare runs like:

multiview output1 output2 > compare.html
open compare.html (safari launches)
will show output2 results as a percentage change from the output1 results

*** Adding additional benchmark tests ***

Look at the sample file trivial.c.  This demonstrates how to do
argument passing, the flow of control of a benchmark, etc. for the
trivial case.  The tests starting with "lmbench_" were ported from
the lmbench suite, so they might be good examples as well.

*** Things to do ***

* port the rest of the lmbench benchmarks into this framework

* create website that will allow easy ability to compare many builds
across many machines with historical repository of runs

* document better how to write a benchmark for this framework
(started in trivial.c)

* check this into xnu/test

* create new benchmarks

*** Leopard notes ***

Due to rdar://4654956 and its original, rdar://2588252 you cannot
run these tests on Leopard without removing the cascade_lockf test.
There may be other tests which panic a Leopard system.