Difference between revisions of "Nodes per Second"
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'''[[Main Page|Home]] * [[Search]] * [[Node]] * Nodes per Second''' | '''[[Main Page|Home]] * [[Search]] * [[Node]] * Nodes per Second''' | ||
| − | [[FILE:RotationsPerMinZollern.JPG|border|right|thumb| [https://en.wikipedia.org/wiki/Tachometer RPM gauge] <ref>[https://en.wikipedia.org/wiki/Tachometer RPM gauge] of an [https://commons.wikimedia.org/wiki/File:Zeche_Zollern_Kompressormotor.jpg?uselang=en electric driven air compressor] in the [https://commons.wikimedia.org/wiki/File:Zeche_Zollern_Dortmund_-_Maschinenhalle.jpg?uselang=en machine hall] of [[ | + | [[FILE:RotationsPerMinZollern.JPG|border|right|thumb| [https://en.wikipedia.org/wiki/Tachometer RPM gauge] <ref>[https://en.wikipedia.org/wiki/Tachometer RPM gauge] of an [https://commons.wikimedia.org/wiki/File:Zeche_Zollern_Kompressormotor.jpg?uselang=en electric driven air compressor] in the [https://commons.wikimedia.org/wiki/File:Zeche_Zollern_Dortmund_-_Maschinenhalle.jpg?uselang=en machine hall] of [[:Category:Zollern|Zollern II/IV Colliery]], [https://en.wikipedia.org/wiki/Dortmund Dortmund] [https://de.wikipedia.org/wiki/B%C3%B6vinghausen_(Dortmund) Bövinghausen], Germany - part of [[:Category:Industrial Heritage Trail|The Industrial Heritage Trail]], Image by [[Gerd Isenberg]], September 18, 2016</ref> ]] |
| − | '''Nodes per Second''' (NPS)<br/> | + | '''Nodes per Second''', (NPS)<br/> |
a [https://en.wikipedia.org/wiki/Measurement measure] of the chess program's [https://en.wikipedia.org/wiki/Speed speed]. But whereas comparing different version of the same program is fine, comparisons between different engines are more difficult, since programmers use different schemes of counting [[Node|nodes]]. The reciprocal of NPS is [https://en.wikipedia.org/wiki/Time time] per node, which translates to processor [https://en.wikipedia.org/wiki/Cycle_per_second cycles] per node. | a [https://en.wikipedia.org/wiki/Measurement measure] of the chess program's [https://en.wikipedia.org/wiki/Speed speed]. But whereas comparing different version of the same program is fine, comparisons between different engines are more difficult, since programmers use different schemes of counting [[Node|nodes]]. The reciprocal of NPS is [https://en.wikipedia.org/wiki/Time time] per node, which translates to processor [https://en.wikipedia.org/wiki/Cycle_per_second cycles] per node. | ||
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* [[Chess Position|Position]] | * [[Chess Position|Position]] | ||
* [[Search Statistics]] | * [[Search Statistics]] | ||
| + | * [[Alexander Szabo#TechnologyCurve|The Technology Curve]] | ||
=Forum Posts= | =Forum Posts= | ||
==1995 ...== | ==1995 ...== | ||
| + | * [https://groups.google.com/d/msg/rec.games.chess.computer/M3z_ygsx9W4/_5zcI78-szkJ Speed of chess programs?] by [[Jan Eric Larsson]], [[Computer Chess Forums|rgcc]], August 29, 1995 | ||
* [http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/926eaf0869b6f176# quiescent vs non-quiescent node counting] by [[Robert Hyatt]], [[Computer Chess Forums|rgcc]], July 01, 1996 | * [http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/926eaf0869b6f176# quiescent vs non-quiescent node counting] by [[Robert Hyatt]], [[Computer Chess Forums|rgcc]], July 01, 1996 | ||
* [http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/e012aa6e3d284ed nodes per second - how to count?] by [[Peter Kappler]], [[Computer Chess Forums|rgcc]], January 20, 1997 | * [http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/e012aa6e3d284ed nodes per second - how to count?] by [[Peter Kappler]], [[Computer Chess Forums|rgcc]], January 20, 1997 | ||
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* [https://www.stmintz.com/ccc/index.php?id=190499 Playing the NPS game] by [[Gian-Carlo Pascutto]], [[CCC]], September 26, 2001 | * [https://www.stmintz.com/ccc/index.php?id=190499 Playing the NPS game] by [[Gian-Carlo Pascutto]], [[CCC]], September 26, 2001 | ||
* [https://www.stmintz.com/ccc/index.php?id=198907 High NPS vs. Low NPS] by [[Russell Reagan]], [[CCC]], November 25, 2001 | * [https://www.stmintz.com/ccc/index.php?id=198907 High NPS vs. Low NPS] by [[Russell Reagan]], [[CCC]], November 25, 2001 | ||
| − | * [https://www.stmintz.com/ccc/index.php?id=265653 Measuring NPS...] by Joel, [[CCC]], November 17, 2002 | + | * [https://www.stmintz.com/ccc/index.php?id=265653 Measuring NPS...] by [[Joel Veness]], [[CCC]], November 17, 2002 |
* [https://www.stmintz.com/ccc/index.php?id=272748 C and C++ --- NPS] by Arshad F. Syed, [[CCC]], December 23, 2002 | * [https://www.stmintz.com/ccc/index.php?id=272748 C and C++ --- NPS] by Arshad F. Syed, [[CCC]], December 23, 2002 | ||
* [https://www.stmintz.com/ccc/index.php?id=363895 n/s again...] by [[Stefano Gemma]], [[CCC]], May 07, 2004 | * [https://www.stmintz.com/ccc/index.php?id=363895 n/s again...] by [[Stefano Gemma]], [[CCC]], May 07, 2004 | ||
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==2010 ...== | ==2010 ...== | ||
* [http://www.open-chess.org/viewtopic.php?f=5&t=1004 Node counting] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 20, 2011 » [[Rybka]] | * [http://www.open-chess.org/viewtopic.php?f=5&t=1004 Node counting] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 20, 2011 » [[Rybka]] | ||
| + | * [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=39028 More about NPS...] by [[Fermin Serrano]], [[CCC]], May 10, 2011 | ||
* [http://www.talkchess.com/forum/viewtopic.php?t=40269 How do you count nodes?] by [[Edsel Apostol]], [[CCC]], September 04, 2011 | * [http://www.talkchess.com/forum/viewtopic.php?t=40269 How do you count nodes?] by [[Edsel Apostol]], [[CCC]], September 04, 2011 | ||
* [http://www.talkchess.com/forum/viewtopic.php?t=43249 Comparative nodes per second] by [[Larry Kaufman]], [[CCC]], April 10, 2012 | * [http://www.talkchess.com/forum/viewtopic.php?t=43249 Comparative nodes per second] by [[Larry Kaufman]], [[CCC]], April 10, 2012 | ||
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* [http://www.talkchess.com/forum/viewtopic.php?t=65007 Nodes/sec. with last new CPU's!] by Vael Jean-Paul, [[CCC]], August 27, 2017 | * [http://www.talkchess.com/forum/viewtopic.php?t=65007 Nodes/sec. with last new CPU's!] by Vael Jean-Paul, [[CCC]], August 27, 2017 | ||
* [http://www.talkchess.com/forum/viewtopic.php?t=66701 Reliable speed comparison: some math required] by [[Marco Costalba]], [[CCC]], February 27, 2018 » [[Optimization]] | * [http://www.talkchess.com/forum/viewtopic.php?t=66701 Reliable speed comparison: some math required] by [[Marco Costalba]], [[CCC]], February 27, 2018 » [[Optimization]] | ||
| + | * [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=70919 strategies for finding slowdows in lazy smp] by [[Folkert van Heusden]], [[CCC]], June 04, 2019 » [[Lazy SMP]], [[Thread]] | ||
=External Links= | =External Links= | ||
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'''[[Node|Up one Level]]''' | '''[[Node|Up one Level]]''' | ||
| + | [[Category:Industrial Heritage Trail]] | ||
| + | [[Category:Zollern]] | ||
Latest revision as of 12:44, 16 January 2020
Home * Search * Node * Nodes per Second
Nodes per Second, (NPS)
a measure of the chess program's speed. But whereas comparing different version of the same program is fine, comparisons between different engines are more difficult, since programmers use different schemes of counting nodes. The reciprocal of NPS is time per node, which translates to processor cycles per node.
Contents
Counting Nodes
Some programs include incrementing the counter after a call to:
- the Search Function
- the Evaluation Function
- Make Move
The first approach suffers from the fact that most of selectivity techniques, where a node is pruned completely, tend to improve nodes per second. The second approach is heavily dependent on the fact whether evaluation function is called in interior nodes or in the quiescence search only. The third overemphasizes the difference between legal and pseudo-legal move generation.
See also
Forum Posts
1995 ...
- Speed of chess programs? by Jan Eric Larsson, rgcc, August 29, 1995
- quiescent vs non-quiescent node counting by Robert Hyatt, rgcc, July 01, 1996
- nodes per second - how to count? by Peter Kappler, rgcc, January 20, 1997
- The Crafty-Rebel NPS challenge... by Ed Schröder, rgcc, February 26, 1997
- The Crafty-Rebel NPS challenge started!!! by Ed Schröder, rgcc, March 07, 1997
- Rebel-Crafty NPS Challenge by Amir Ban, rgcc, March 19, 1997
- NPS challenge will end after game one... by Ed Schröder, rgcc, March 26, 1997
- NPS by Andreas Mader, CCC, November 14, 1997
- Node counting confusion by Don Dailey, CCC, January 17, 1998
- Nodes per second........ by James Robertson, CCC, September 26, 1998
- NPS and ply depth by Enrique Irazoqui, CCC, January 28, 1999
- WCCC and some NPS observations by Jouni Uski, CCC, June 23, 1999 » WCCC 1999
2000 ...
- DB NPS (anyone know the position used)? by Chris Carson, CCC, January 25, 2000 » Deep Blue
- typical nps on single cpus by Will Singleton, CCC, February 13, 2000
- What is the average nodes per second for minimax? by Leonid, CCC, June 15, 2000
- Is the NPS for minimax devided by NPS in alpha-beta = 5 ? by Leonid, CCC, June 16, 2000
- Is the NPS tend to grow at the end of the game? by Leonid, CCC, July 22, 2000
- A story about NPS by Severi Salminen, CCC, January 26, 2001
- What is the average NPS and Depth of Top Programs? by Joshua Lee, CCC, July 26, 2001
- Playing the NPS game by Gian-Carlo Pascutto, CCC, September 26, 2001
- High NPS vs. Low NPS by Russell Reagan, CCC, November 25, 2001
- Measuring NPS... by Joel Veness, CCC, November 17, 2002
- C and C++ --- NPS by Arshad F. Syed, CCC, December 23, 2002
- n/s again... by Stefano Gemma, CCC, May 07, 2004
- how to calculate nps? by Peter Alloysius, CCC, July 19, 2004
2005 ...
- NPS by David B. Weller, Winboard Forum, August 27, 2005 » Xpdnt
- Rybka's NPS - one presumption by Vladan Vučković, CCC, February 16, 2006 » Rybka
- Transposition Table and nps drop by Mathieu Pagé, CCC, February 27, 2008 » Transposition Table
- To Jeroen and interested minds, re. Tiger node count by Christophe Théron, CCC, August 15, 2008
- nps scaling by Daniel Shawul, CCC, March 01, 2009 » Parallel Search
2010 ...
- Node counting by BB+, OpenChess Forum, January 20, 2011 » Rybka
- More about NPS... by Fermin Serrano, CCC, May 10, 2011
- How do you count nodes? by Edsel Apostol, CCC, September 04, 2011
- Comparative nodes per second by Larry Kaufman, CCC, April 10, 2012
- Current data - threads-nps efficiency up to 32 threads by Andreas Strangmüller, CCC, October 24, 2014 » Parallel Search, Thread
2015 ...
- SMP NPS measurements by Peter Österlund, CCC, August 06, 2017 » Lazy SMP, Parallel Search
- Nodes/sec. with last new CPU's! by Vael Jean-Paul, CCC, August 27, 2017
- Reliable speed comparison: some math required by Marco Costalba, CCC, February 27, 2018 » Optimization
- strategies for finding slowdows in lazy smp by Folkert van Heusden, CCC, June 04, 2019 » Lazy SMP, Thread
External Links
- Time from Wikipedia
- Second from Wikipedia
- Frequency from Wikipedia
- Cycle per second from Wikipedia
- Instruction cycle from Wikipedia
- Instructions per second
References
- ↑ RPM gauge of an electric driven air compressor in the machine hall of Zollern II/IV Colliery, Dortmund Bövinghausen, Germany - part of The Industrial Heritage Trail, Image by Gerd Isenberg, September 18, 2016
