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QuickPi v4.5 Documentation
Copyright (c) 2000-2008 S. Pagliarulo
HOW TO USE THIS DOCUMENT
To properly view this document in Notepad, maximize the Notepad window and
make sure a fixed-width font such as Courier is selected. To print this
document, open it in Notepad or any other word processor and select Print from
the File menu.
INSTALLATION
Installation of QuickPi is easy. Simply unzip the QPI45.ZIP file in the
directory of your choosing. No changes are made to the Windows registry or
any other part of the system. QuickPi is intended for use on Windows XP or
Windows Vista with a Pentium 4 or newer processor. The 64-bit (x64) version
of QuickPi requires Windows x64 edition and an AMD processor with AMD64
instruction set or an Intel processor with EM64T technology (Intel 64).
DISTRIBUTION NOTES
The files that comprise the QPI45.ZIP file including the QPI v4.5 executable
are freely available for distribution. If you plan to distribute QuickPi
online, you must distribute the entire file set as originally received and not
the individual files.
-----------------
QUICKPI OVERVIEW
QuickPi is designed to quickly compute Pi to a very high precision. The
program is one of the fastest available on the Windows platform. In addition
to its speed, QuickPi offers 6 different methods for computing Pi and can also
compute other constants such as e and the square root of 2 with equal
precision and speed.
USAGE INFORMATION
QuickPi is a command line program and as such you will need to start a Command
Prompt window to use it. Refer to your Windows help guide for information on
how to start a Command Prompt window.
Once a Command Prompt window has been started, be sure the QuickPi application
QPI.EXE (or QPI64.EXE) is located in your system path. If it's not, then
change the current working directory to that chosen when the program was first
installed. Again, refer to your Windows help guide for information on PATHs
and the CHDIR command.
Entering QPI on the command line without any parameters will produce the
following information:
QPI-QuickPi v4.5, (c) 2000-2008 S. Pagliarulo
Freely distributable, email: s_pagliarulo@hotmail.com
usage: qpi digits[k|m|g] [destfile] [options|-h]
Information in square brackets [] is optional. Items separated by a vertical
bar | indicate an either-or choice. The k, m and g suffix following "digits"
allows you to specify kilo (1,024), mega (1,048,576) or giga (1,073,741,824)
digits respectively. Other suffixes include th, mi, and bi for a thousand
(1,000), million (1,000,000) or billion (1,000,000,000) digits respectively.
For example, to specify 1,000,000 digits of pi, enter:
qpi 1mi
The output will be sent to the console screen. To save the output to a text
file, simply specify a destination file name following the digits
specification:
qpi 1mi pi.txt
This will save the output to the file "pi.txt" as well as providing progress
information to the console screen. Note, the output of QuickPi 4.5 can also
be "redirected" with the > operator. In this case however, no progress
information will be provided to the console screen.
Entering QPI on the command line with the -h option will produce the following
help information:
-OPTIONS-
-PI COMPUTATION- -OTHER CONSTANTS-
-agm[1|2|3] AGM methods (1,2,3) -e, -exp natural log base, e
-borwein Borweins' quartic -2, -sqrt2 Pythagoras' constant
-chudnovsky Chudnovskys' method -phi golden mean
-ramanujan Ramanujan's method -zeta3 Apery's constant
-machin Machin's arctan formula -gamma Euler's constant
-stormer Stormer arctan formula -catalan Catalan's constant
-ln(n) natural log of (n)
-sqrt(n) square root of (n)
-cbrt(n) cube root of (n)
-OUTPUT FORMAT-
-fancy:dpc,dpr, dpc - digits per column [default=10]
dpb,bs,dc, dpr - digits per row [default=50]
fl dpb - digits per block [default=500]
bs - block spacing [default=1]
dc - digit counting (none,row,block,line) [default=row]
fl - flags (noindent,indent) [default=noindent]
-COMPUTATION-
-formula<n> use alternate formula (1-n) for computation
-inverse compute multiplicative inverse
-MEMORY MANAGEMENT-
-memory:<size> set upper memory limit (affects performance)
-swap:<path> specify the location of swap files
-noswap disable swap file creation
-MULTITHREADING-
-threads collect and output thread usage information
-threads:<n> set maximum number of threads (affects performance)
-nomt disable multithreading
-MISCELLANEOUS-
-train train program for optimal performance
-binary compress output and create binary file
-stats output computation statistics only (suppress digit data)
-checksum include checksum of computation result
-save save options as default values
-license display software license information
-pause pause when finished
Most options can be abbreviated to their first letter. Where duplicates
exist, using two letters will generally differentiate the options.
OPTION DESCRIPTIONS
-agm[1|2|3]
This option causes QuickPi to compute Pi using one of the AGM (Arithmetic-
Geometric-Mean) formulas first discovered by Gauss and Legendre and later
independently by Brent and Salamin (1). QuickPi actually uses optimized
algorithm variants of these formulas.
Specifying -agm or -agm1 causes QuickPi to use a formula developed by Arnold
Schonhage (2). This formula is currently QuickPi's fastest AGM method.
Specifying -agm2 causes QuickPi to use a formula by Takuya Ooura (3). This is
currently QuickPi's second-fastest AGM method. Specifying -agm3 causes
QuickPi to use the Brent-Salamin formula.
The AGM formulas are iterations that are quadratic in nature (the number of
digits doubling with each iteration). To compute one million digits of Pi,
the AGM typically uses 19 iterations.
-borwein
This option causes QuickPi to compute Pi using a quartic AGM iteration by
Jonathan and Peter Borwein. A quartic iteration quadruples the number of
digits at each iteration (at the cost of more operations per iteration). To
compute two million digits of Pi, the Borwein quartic formula only requires 10
iterations.
-chudnovsky
This is the default option for QuickPi when no other options are specified.
This option causes QuickPi to compute Pi using a Ramanujan-like series formula
discovered by David and Gregory Chudnovsky. This formula provides
approximately 14 correct digits per term. This is currently QuickPi's fastest
method for computing Pi.
-ramanujan
This option causes QuickPi to compute Pi using one of the many series formulas
discovered by Srinivasa Ramanujan. The particular formula used by QuickPi
provides approximately 8 digits per term and runs predictably slower than the
series by the Chudnovsky brothers.
-machin
This option causes QuickPi to compute Pi using the arctangent formula
discovered by John Machin in 1706. Machin's refinement on the
Gregory/Leibniz series yielded a formula with a significantly greater rate of
convergence: pi/4 = 4 arctan(1/5) - arctan(1/239)
-stormer
This option causes QuickPi to compute Pi using an arctangent formula
discovered by F.C.W. Stormer in 1896. This is one of the same formulas used
by Yasumasa Kanada of the University of Tokyo (4) and his team to compute Pi
to a record 1 trillion digits: pi/4 = 44 arctan(1/57) + 7 arctan(1/239) - 12
arctan(1/682) + 24 arctan(1/12943)
-e, -exp
This option causes QuickPi to compute the natural logarithmic base, e. The
constant e = exp(1) is defined as: 1 + 1/1! + 1/2! + 1/3! + ...
-2, -sqrt2
This option causes QuickPi to compute Pythagoras' constant, the square root of
2. QuickPi uses Newton's iteration for computing square roots. With an
initial estimate (x), Newton's iteration for the square root of 2 converges
quadratically using the sequence: x = (x/2 + 1/x).
-phi
This option causes QuickPi to compute the Golden Mean. Also known as the
Golden Ratio or the Golden Section, it is usually represented by the Greek
letter Phi. QuickPi uses Newton's iteration for computing Phi (see -sqrt2).
The formula for Phi is: (1 + sqrt(5)) / 2.
-zeta3
This option causes QuickPi to compute Apery's constant, Zeta(3). Zeta(3) is
defined by the formula: 1 + 1/2^3 + 1/3^3 + 1/4^3 + ... QuickPi uses a faster
series discovered by Amdeberhan and Zeilberger for this computation.
-gamma
This option causes QuickPi to compute Euler's constant (or Mascheroni's
constant) and is defined as the limit of: 1 + 1/2 + 1/3 + 1/4 + 1/5 + ... +
1/n - ln(n). The constant is usually denoted by the lower-case Greek letter
Gamma. QuickPi uses a faster method due to Brent and McMillan for this
computation.
-catalan
This option causes QuickPi to compute Catalan's constant. Catalan is defined
by the following series: 1/1^2 - 1/3^2 + 1/5^2 - 1/7^2 + 1/9^2 - ... and is
usually denoted as K, G or sometimes C. QuickPi uses a faster series by
Alexandru Lupas for this computation.
-ln(n)
This option causes QuickPi to compute the natural logarithm of an integer
value (n). Natural logs are the solution to the equation: e^x = n.
-sqrt(n)
This option causes QuickPi to compute the square root of an integer value (n).
-cbrt(n)
This option causes QuickPi to compute the cube root of an integer value (n).
-fancy:
This option allows the formatted output of QuickPi to be customized. The
default format is 10 digits per column, 50 digits per row and 500 digits per
block. Blocks are separated by 1 blank line, digits are counted after each
row and lines are not indented. Specifying each (in order) as follows can
change these parameters:
-fancy:dpc,dpr,dpb,bs,dc,fl
For example, the following parameters cause QuickPi to output 5 digits per
column, 50 digits per row and 1000 digits per block with lines indented. Note
that any missing parameters remain unchanged.
-fancy:5,50,1000,,,indent
There are two other valid parameters for this option. They are -fancy:default
and -fancy:raw. The first causes the QuickPi to revert to its original
default parameters and the second causes QuickPi to produce unformatted
output. Unformatted output is simply a stream of digits without spaces or
line termination.
-formula<n>
This option enables QuickPi to use an alternate formula for a computation.
Specifying -formula1 causes QuickPi to use its primary (default) formula and
specifying -formula2 thru -formula9 causes QuickPi to use an alternate
(generally slower) formula. Alternate formulas are useful to verify the
correctness of a computation. The following constants have alternate
formulas:
-exp -formula2
-phi -formula2
-catalan -formula2
-zeta3 -formula2
-sqrt(n) -formula2
-cbrt(n) -formula2
-ln(n) -formula2
-inverse
This option causes QuickPi to compute the multiplicative inverse or reciprocal
result. This option is not available for all constants.
-memory:<size>
This option sets the upper limit of memory use for QuickPi. The size
parameter may be followed by an m to indicate megabytes (1048576 bytes). The
smallest value that can be specified is 32 megabytes, smaller values are
ignored. When the upper limit of memory is reached, QuickPi will reduce its
memory consumption and may swap memory to disk unless the creation of swap
files is disabled (see -noswap option). Note, very large computations may
still cause QuickPi to go over the specified memory limit.
-swap:<path>
Normally, QuickPi creates swap files in the current directory. This option
causes QuickPi to use the specified path as the location for creating swap
files. A drive letter may be included as part of the path. The path must
already exist.
-noswap
This option prevents QuickPi from creating swap files when running low on
memory.
-threads
This option (without a value) causes QuickPi to collect and output information
related to thread and processor usage. By default, QuickPi allocates one
thread for each processor core or SMT execution context.
-threads:<n>
This option (with a value) sets the maximum number of threads that QuickPi can
use. Any value in the range from 1 to 32 is accepted. The actual number of
threads used depends on the size of a computation, the amount of available
memory and other internal factors. Increasing the number of threads does not
always translate to improved performance.
-nomt
This option completely disables multithreading causing QuickPi to operate as a
single-threaded application.
-train
This option causes QuickPi to train or configure itself for a specific
computer environment. Once trained, QuickPi will usually run faster than its
default configuration. Training will normally take several minutes to
complete. Training information is saved to a QPI.INI file located in the same
directory as QPI.EXE. QuickPi will then read the training information the
next time it's run. It is recommended that all Windows applications be closed
and any background tasks (including screensavers) be disabled prior to
initiating training.
-binary
This option causes QuickPi to write its output as a compressed binary file.
Compressed files are generally 1/2 to 1/3 the size of QuickPi's normal output.
A secondary reader program QRD (included) is required to view compressed
binary files. The QuickPi Reader program is described below.
-stats
This option causes QuickPi to output computation statistics only and suppress
the output of digit data. This can be useful when only the statistics of a
computation are desired for comparison purposes.
-checksum
This option causes QuickPi to calculate and display a checksum for a
computation result. A checksum can be useful to validate a result without
having to perform a digit by digit comparison.
-save
This option causes QuickPi to save the settings of the above specified options
to a QPI.INI file located in the same directory as QPI.EXE. The next time
QuickPi is started, it will automatically read the QPI.INI file and default to
the saved options. This is particularly useful for the -fancy option and its
various parameters.
-license
This option displays the QuickPi license information.
-pause
This option causes QuickPi to pause and wait for a key to be pressed when its
operation is complete. QuickPi will automatically pause if started from the
Windows Desktop.
----------------
READER OVERVIEW
The QuickPi Reader is designed to decompress a binary file written by QuickPi
and output it in a variety of customizable formats. Using the Reader allows
you to quickly output all or part of a QuickPi result without having to re-run
a (perhaps lengthy) QuickPi computation. In addition, compressed binary files
are up to 1/2 to 1/3 the size of QuickPi's normal output, saving a significant
amount of disk space if result files are archived.
USAGE INFORMATION
The QuickPi Reader is a command line program and as such you will need to
start a Command Prompt window to use it. Refer to your Windows help guide for
information on how to start a Command Prompt window.
Once a Command Prompt window has been started, be sure the Reader program
QRD.EXE (or QRD64.EXE) is located in your system path. If it's not, then
change the current working directory to that chosen when the program was first
installed. Again, refer to your Windows help guide for information on PATHs
and the CHDIR command.
Entering QRD on the command line without any parameters will produce the
following information:
QRD-QuickPi binary reader v4.5, (c) 2000-2008 S. Pagliarulo
Freely distributable, email: s_pagliarulo@hotmail.com
usage: qrd sourcefile [destfile] [options|-h]
Information in square brackets [] is optional. Items separated by a vertical
bar | indicate an either-or choice. For example, to view the compressed
binary file "pi.bin" created by QuickPi, enter:
qrd pi.bin
The output will be sent to the console screen. To save the output to a text
file, simply specify a destination file name after the source file name:
qrd pi.bin pi.txt
This will save the output to the file "pi.txt".
Entering QRD on the command line with the -h option will produce the following
help information:
options:
-stats output computation statistics only
-nostats output digit data only
-range:start-end output a range of digits
start - start of range (1-)
end - end of range (1-)
-skip:count,step skip over output
count - output [count] digits
step - every [step] digits
-fancy:dpc,dpr, customize output format
dpb,bs,dc, dpc - digits per column
fl dpr - digits per row
dpb - digits per block
bs - block spacing
dc - digit counting (none,row,block,line)
fl - flags (noindent,indent)
-inverse compute multiplicative inverse
-square compute square
-cube compute cube
-ln compute natural log
-binary create binary output file
-license display software license information
-pause pause when finished
Most options can be abbreviated to their first letter. Where duplicates
exist, using two letters will generally differentiate the options.
OPTION DESCRIPTIONS
-stats
This option causes the QuickPi Reader to output computation statistics only
and suppress the output of digit data. This option can be used to obtain a
summary of a compressed binary file's contents.
-nostats
This option causes the QuickPi Reader to suppress the output of computation
statistics that normally precede the digit data. This option should be used
when only digit data is desired.
-range:
This option causes the QuickPi Reader to limit the range of digits output. A
starting point, an ending point, or both starting and ending points can be
entered, separated by a dash. Multiple ranges can be specified by separating
them with a comma or by entering multiple -range options from the command
line. For example, the following parameters will output the first and last
100 digits of 20k computed digits:
-range:1-100,20381-20480
-skip:
This option causes the QuickPi Reader to skip across the full range of
computed digits and to only occasionally output a specified number of them.
The first parameter specifies the number of digits to output. The second
parameter specifies the skip amount. For example, the following parameters:
-skip:100,10000
cause the QuickPi Reader to produce the following output with 20k computed
digits of Pi:
Listing Pi, 100 digits every 10,000 digits
3.
1415926535 8979323846 2643383279 5028841971 6939937510 : 50
5820974944 5923078164 0628620899 8628034825 3421170679 : 100
5667227966 1988578279 4848855834 3975187445 4551296563 : 10050
4434803966 4205579829 3680435220 2770984294 2325330225 : 10100
2038565390 9910477594 1413215432 8440625030 1802757169 : 20050
6508209642 7348414695 7263978842 5600845312 1406593580 : 20100
-fancy:
This option allows the formatted output of the QuickPi Reader to be
customized. The default format is saved as part of the compressed binary file
created by QuickPi. Unless changed when using QuickPi, the default format is
10 digits per column, 50 digits per row and 500 digits per block. Blocks are
separated by 1 blank line, digits are counted after each row and lines are not
indented. Specifying each (in order) as follows can change these parameters:
-fancy:dpc,dpr,dpb,bs,dc,fl
For example, the following parameters cause QuickPi Reader to output 5 digits
per column, 50 digits per row and 1000 digits per block with lines indented.
Note that any missing parameters remain unchanged.
-fancy:5,50,1000,,,indent
There are two other valid parameters for this option. They are -fancy:default
and -fancy:raw. The first causes the QuickPi Reader to revert to its original
default parameters and the second causes the QuickPi Reader to produce
unformatted output. Unformatted output is simply a stream of digits without
spaces or line termination.
-inverse
This option causes the QuickPi Reader to compute and output the multiplicative
inverse or reciprocal of a result.
-square
This option causes the QuickPi Reader to compute and output the square of a
result.
-cube
This option causes the QuickPi Reader to compute and output the cube of a
result.
-ln
This option caused the QuickPi Reader to compute and output the natural
logarithm of a result.
-binary
This option causes the QuickPi Reader to write its output as a compressed
binary file. This option is useful when combined with the -inverse, -square,
-cube or -ln options.
-license
This option displays the QuickPi Reader license information.
-pause
This option causes the QuickPi Reader to pause and wait for a key to be
pressed when its operation is complete. The QuickPi Reader will automatically
pause if started from the Windows Desktop.
-------------------
PROGRAM LIMITATIONS
The upper limit for the 32-bit version of QuickPi is 1 billion digits. The
64-bit version has been successfully tested with over 100 billion digits and
has a theoretical upper limit of 500 billion digits. The exact upper limit
depends on several factors including but not limited to the amount of memory
and disk space available. Each new release of QuickPi should continue to
perform faster and with higher precision.
WARRANTIES AND DISCLAMERS
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, FUNCTIONALITY
AND DATA INTEGRITY OR PROTECTION ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL OR PUNITIVE DAMAGES WHICH MAY
RESULT FROM THE USE OF THIS SOFTWARE, INCLUDING LOSS OR INTERRUPTION OF
BUSINESS, ACCIDENTAL LOSS OF DATA OR DAMAGE TO COMPUTER EQUIPMENT.
ACKNOWLEDGEMENTS
My thanks and appreciation to all the Beta testers who have assisted with the
testing of this version over the past many months. A special thanks to
Shigeru Kondo for his extra dedication, enthusiasm, helpful feedback and
suggestions.
CONTACTING THE AUTHOR
Questions and comments concerning QuickPi should be directed to Steve
Pagliarulo. Steve can be contacted via email at: s_pagliarulo@hotmail.com
WEBSITES DEDICATED TO PI
Stu's pi page: http://home.istar.ca/~lyster/pi.html
Xavier Gourdon: http://numbers.computation.free.fr/Constants/constants.html
jasonp's home page: http://www.boo.net/~jasonp/
Shigeru's pi world: http://ja0hxv.calico.jp/pai/estart.html
-------------------
(1) R.P. Brent, Fast multiple-precision evaluation of elementary functions, J.
ACM 23 (1976), 242-251.
(2) Arnold Schonhage, A.F.W. Grotefeld/E. Vetter, Fast Algorithms, A Multitape
Turing Machine Implementation, BI Wissenschaftsverlag, Mannheim (1994), p.266.
(3) Takuya Ooura maintains a website dedicated to Pi and the AGM at:
http://www.kurims.kyoto-u.ac.jp/~ooura/pi_fft.html
(4) The Kanada Laboratory maintains a website dedicated to computing Pi at:
http://www.super-computing.org