The TOP500 project ranks and details the 500 most powerful non-distributed computer systems in the world. The project was started in 1993 and publishes an updated list of the supercomputers twice a year. The first of these updates always coincides with the International Supercomputing Conference in June, and the second is presented in November at the ACM/IEEE Supercomputing Conference. The project aims to provide a reliable basis for tracking and detecting trends in high-performance computing and bases rankings on HPL, a portable implementation of the high-performance LINPACK benchmark written in Fortran for distributed-memory computers. As of July 2016, the Sunway TaihuLight is the most powerful supercomputer, reaching 93.015 petaflops on the LINPACK benchmarks.
The TOP500 list is compiled by Jack Dongarra of the University of Tennessee, Knoxville, Erich Strohmaier and Horst Simon of NERSC/Lawrence Berkeley National Laboratory (and, from 1993 until his death in 2014, Hans Meuer of the University of Mannheim, Germany.)
- 1 History
- 2 Architecture and operating systems
- 3 Top 10 ranking
- 4 Other rankings
- 5 New developments in supercomputing
- 6 Large machines not on the list
- 7 See also
- 8 References
- 9 External links
In the early 1990s, a new definition of supercomputer was needed to produce meaningful statistics. After experimenting with metrics based on processor count in 1992, the idea was born at the University of Mannheim to use a detailed listing of installed systems as the basis. In early 1993, Jack Dongarra was persuaded to join the project with his LINPACK benchmark. A first test version was produced in May 1993, partially based on data available on the Internet, including the following sources:
- "List of the World's Most Powerful Computing Sites" maintained by Gunter Ahrendt
- David Kahaner, the director of the Asian Technology Information Program (ATIP), in 1992 had published a report titled "Kahaner Report on Supercomputer in Japan" which had an immense amount of data.
The information from those sources was used for the first two lists. Since June 1993, the TOP500 is produced bi-annually based on site and vendor submissions only.
Since 1993, performance of the #1 ranked position has steadily grown in agreement with Moore's law, doubling roughly every 14 months. As of November 2014[update], the fastest system, the Tianhe-2 with a Rpeak of 54.9024 PFLOPS, is over 419,102 times faster than the fastest system in November 1993, the Connection Machine CM-5/1024 (1024 cores) with Rpeak of 131.0 GFLOPS.
Architecture and operating systems
As of November 2015[update], TOP500 supercomputers are mostly based on x86-64 CPUs (Intel EMT64 and AMD AMD64 instruction set architecture), with few exceptions (all RISC-based) including 39 supercomputers based on Power Architecture used by IBM POWER microprocessors, seven SPARC (all Fujitsu/SPARC-based, one of which surprisingly made the top in 2011 without a GPU, currently ranked fourth), and one ShenWei-based (ranked 11 in 2011, ranked 65th in November 2014) making up the remainder. Prior to the ascendance of 32-bit x86 and later 64-bit x86-64 in the early 2000s, a variety of RISC processor families made up the majority of TOP500 supercomputers, including RISC architectures such as SPARC, MIPS, PA-RISC and Alpha.
In recent years heterogeneous computing, mostly using Nvidia's graphics processing units (GPU) as coprocessors, has become a popular way to reach a better performance per watt ratio and higher absolute performance; it is almost required for good performance and to make the top (or top 10), with some exceptions, such as the mentioned SPARC computer without any coprocessors. A x86-based coprocessor, Xeon Phi, has also been used.
All the fastest supercomputers in the decade since the Earth Simulator supercomputer have used a Linux-based operating system. As of November 2015[update], 494 or 98.8% of the world's fastest supercomputers use the Linux kernel. The remaining six or 1.2%, run the AIX Unix variant operating system. Within those 98.8% running Linux are the most powerful supercomputers including those ranking as the top ten.
The non-Linux computers on the list – the six AIX ones – are all running on POWER7 (highest one ranked 208th). Those are made by IBM (except for one ranked 418th by Hitachi). IBM has higher ranked computers running Linux.
Since November 2015, no computer on the list runs Windows. In November 2014, Windows Azure cloud computer was no longer on the list of fastest supercomputers (its best rank was 165 in 2012), leaving the Shanghai Supercomputer Center's “Magic Cube” as the only Windows-based supercomputer on the list, until “Magic Cube” also dropped off the list. “Magic Cube” was ranked 436 in its last appearance on the list released in June 2015.
Top 10 ranking
- Rank – Position within the TOP500 ranking. In the TOP500 list table, the computers are ordered first by their Rmax value. In the case of equal performances (Rmax value) for different computers, the order is by Rpeak. For sites that have the same computer, the order is by memory size and then alphabetically.
- Rmax – The highest score measured using the LINPACK benchmark suite. This is the number that is used to rank the computers. Measured in quadrillions of floating point operations per second, i.e. petaflops.
- Rpeak – This is the theoretical peak performance of the system. Measured in PFLOPS.
- Name – Some supercomputers are unique, at least on its location, and are therefore named by their owner.
- Computer – The computing platform as it is marketed.
- Processor cores – The number of active processor cores actively used running LINPACK. After this figure is the processor architecture of the cores named. If the interconnect between computing nodes is of interest, it's also included here.
- Vendor – The manufacturer of the platform and hardware.
- Site – The name of the facility operating the supercomputer.
- Country – The country in which the computer is situated.
- Year – The year of installation/last major update.
- Operating system – The operating system that the computer uses.
Numbers below represent the number of computers in the TOP500 that are in each of the listed countries.
|Country||Jun 2016||Nov 2015||Jun 2015||Nov 2014||Jun 2014||Nov 2013||Jun 2013||Nov 2012||Jun 2012||Nov 2011||Jun 2011||Nov 2010||Jun 2010||Nov 2009||Jun 2009||Nov 2008||Jun 2008||Nov 2007|
|United Arab Emirates||1|
Systems ranked #1 since 1993
- NRCPC Sunway TaihuLight (National Supercomputing Center in Wuxi China, June 2016 - present)
- NUDT Tianhe-2A (National Supercomputing Center of Guangzhou China, June 2013 - June 2016)
- Cray Titan (Oak Ridge National Laboratory United States, November 2012 - June 2013)
- IBM Sequoia Blue Gene/Q (Lawrence Livermore National Laboratory United States, June 2012 – November 2012)
- Fujitsu K computer (RIKEN Advanced Institute for Computational Science Japan, June 2011 – June 2012)
- NUDT Tianhe-1A (National Supercomputing Center of Tianjin China, November 2010 – June 2011)
- Cray Jaguar (Oak Ridge National Laboratory United States, November 2009 – November 2010)
- IBM Roadrunner (Los Alamos National Laboratory United States, June 2008 – November 2009)
- IBM Blue Gene/L (Lawrence Livermore National Laboratory United States, November 2004 – June 2008)
- NEC Earth Simulator (Earth Simulator Center Japan, June 2002 – November 2004)
- IBM ASCI White (Lawrence Livermore National Laboratory United States, November 2000 – June 2002)
- Intel ASCI Red (Sandia National Laboratories United States, June 1997 – November 2000)
- Hitachi CP-PACS (University of Tsukuba Japan, November 1996 – June 1997)
- Hitachi SR2201 (University of Tokyo Japan, June 1996 – November 1996)
- Fujitsu Numerical Wind Tunnel (National Aerospace Laboratory of Japan Japan, November 1994 – June 1996)
- Intel Paragon XP/S140 (Sandia National Laboratories United States, June 1994 – November 1994)
- Fujitsu Numerical Wind Tunnel (National Aerospace Laboratory of Japan Japan, November 1993 – June 1994)
- TMC CM-5 (Los Alamos National Laboratory United States, June 1993 – November 1993)
Number of systems
New developments in supercomputing
In November 2014, it was announced that the United States was developing two new supercomputers to dethrone China's Tianhe-2 from its position as world's fastest supercomputer. The two computers, Sierra and Summit, will each exceed Tianhe-2's 55 peak petaflops. Summit, the more powerful of the two, will deliver 150-300 peak petaflops. On 10 April 2015, US government agencies banned Intel Corporation from providing Xeon chips to China under the fear that China would use the chips to help conduct nuclear research.
On 29 July 2015, President Obama signed an executive order creating a National Strategic Computing Initiative calling for the accelerated development of an exascale (1000 petaflop) system and funding research into post-semiconductor computing.
Large machines not on the list
Some major systems are not listed on the list. The largest example is the NCSA's Blue Waters which publicly announced the decision not to participate in the list  because they do not feel it accurately indicate the ability for any system to be able to do useful work. Other organizations decide not to list systems for security and/or commercial competitiveness reasons. Additional purpose-built machines that are not capable or do not run the benchmark were not included, such as RIKEN MDGRAPE-3 and MDGRAPE-4.
Computers and architectures that drop off the list
IBM Roadrunner is no longer on the list (or any other using the Cell coprocessor, or PowerXCell as in the Roadrunner supercomputer), but it is an example of a computer that would easily be included, if it had not been decommissioned, as it is faster than the one ranked 500th.
Conversely, computers, such as the Microsoft Azure, have dropped off the list simply because the stated performance numbers are no longer high enough, while theoretically the computers could have been upgraded to get faster (or not) without being reported.
All Itanium based systems (including the one which reached second rank in 2004) and vector processors (NEC-based such as the Earth simulator that was fastest in 2002) have also fallen off the list. Similarly the Sun Starfire computers that occupied many spots have been overtaken.
|Wikimedia Commons has media related to TOP500.|
- LINPACK benchmarks
- Computer science
- HPC Challenge Benchmark
- Instructions per second
- "HPL U+00AD A Portable Implementation of the High-Performance Linpack Benchmark for Distributed-Memory Computers". Retrieved 4 January 2015.
- "AN INTERVIEW WITH JACK DONGARRA by Alan Beck, editor in chief HPCwire". Archived from the original on 28 September 2007.
- Statistics on Manufacturers and Continents
- "The TOP25 Supercomputer Sites". Archived from the original on 23 January 2016. Retrieved 4 January 2015.
- "Where does Asia stand? This rising supercomputing power is reaching for real-world HPC leadership.". Retrieved 4 January 2015.
- Rpeak – This is the theoretical peak performance of the system. Measured in PFLOPS.
- "Sublist Generator". Retrieved 4 January 2015.
- "Top500 - List Statistics - November 2015". Top500.org. Retrieved 17 November 2015.
- "IBM Flex System p460, POWER7 8C 3.550GHz, Infiniband QDR - TOP500 Supercomputer Sites".
- "Hitachi SR16000 Model M1, POWER7 8C 3.836GHz, Custom - TOP500 Supercomputer Sites".
- "Microsoft Windows Azure".
- "Magic Cube - Dawning 5000A, QC Opteron 1.9 GHz, Infiniband, Windows HPC 2008".
- "June 2016 - TOP500 Supercomputer Sites".
- "China Tops Supercomputer Rankings with New 93-Petaflop Machine - TOP500 Supercomputer Sites".
- "November 2015 - TOP500 Supercomputer Sites".
- "June 2015 - TOP500 Supercomputer Sites".
- "November 2014 - TOP500 Supercomputer Sites".
- "List Statistics". Retrieved 20 June 2016.
- Balthasar, Felix. "US Government Funds $425 million to build two new Supercomputers". News Maine. Retrieved 16 November 2014.
- "US nuclear fears block Intel China supercomputer update".
- Executive Order -- Creating a National Strategic Computing Initiative (Executive order), The White House - Office of the Press Secretary, 29 July 2015
- Blue Waters Opts Out of TOP500 (article), 16 November 2012
- Kramer, William., Top500 versus Sustained Performance – Or the Ten Problems with the TOP500 List – And What to Do About Them. 21ST International Conference On Parallel Architectures And Compilation Techniques (PACT12), September 19-23, 2012, Minneapolis, MN
- "ROADRUNNER - BLADECENTER QS22/LS21 CLUSTER, POWERXCELL 8I 3.2 GHZ / OPTERON DC 1.8 GHZ, VOLTAIRE INFINIBAND". Retrieved 4 January 2015.
- "Cluster Platform DL360e Gen8, Xeon E5-2450 8C 2.100GHz, Gigabit Ethernet". Retrieved 4 January 2015.
- "Faenov - Cluster Platform SL230s Gen8, Xeon E5-2670 8C 2.600GHz, Infiniband QDR - TOP500 Supercomputer Sites".
- "Thunder - Intel Itanium2 Tiger4 1.4GHz - Quadrics". Retrieved 4 January 2015.
- "Columbia - SGI Altix 1.5/1.6/1.66 GHz, Voltaire Infiniband". Retrieved 4 January 2015.
- "Japan Agency for Marine -Earth Science and Technology". Retrieved 4 January 2015.