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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 at the ACM/IEEE Supercomputing Conference in November. The project aims to provide a reliable basis for tracking and detecting trends in high-performance computing and bases rankings on HPL,[1] a portable implementation of the high-performance LINPACK benchmark written in Fortran for distributed-memory computers.

China currently dominates the list with 229 supercomputers, leading the second place (United States) by a record margin of 121. Since June 2018, the American Summit is the world's most powerful supercomputer, reaching 143.5 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 the National Energy Research Scientific Computing Center (NERSC) and Lawrence Berkeley National Laboratory (LBNL), and from 1993 until his death in 2014, Hans Meuer of the University of Mannheim, Germany.

Contents

HistoryEdit

 
Rapid growth of supercomputer performance, based on data from top500.org site. The logarithmic y-axis shows performance in GFLOPS.
  Combined performance of 500 largest supercomputers
  Fastest supercomputer
  Supercomputer in 500th place

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 arose 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 benchmarks. A first test version was produced in May 1993, partly based on data available on the Internet, including the following sources:[2][3]

  • "List of the World's Most Powerful Computing Sites" maintained by Gunter Ahrendt[4]
  • David Kahaner, the director of the Asian Technology Information Program (ATIP);[5] published a report in 1992, titled "Kahaner Report on Supercomputer in Japan"[3] which had an immense amount of data.[citation needed]

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 No. 1 ranked position has grown steadily in accordance with Moore's law, doubling roughly every 14 months. As of June 2018, Summit was fastest with an Rpeak[6] of 187.6593 PFLOPS. For comparison, this is over 1,432,513 times faster than the Connection Machine CM-5/1024 (1,024 cores), which was the fastest system in November 1993 (twenty-five years prior) with an Rpeak of 131.0 GFLOPS.[7]

Architecture and operating systemsEdit

As of November 2018, all supercomputers on TOP500 are 64-bit, mostly (all Intel-based, except for three) based on x86-64 CPUs (Intel EMT64 and AMD AMD64 instruction set architecture), with few exceptions (all based on reduced instruction set computing (RISC) architectures). Thirteen supercomputers are based on the Power ISA used by IBM POWER microprocessors (plus one new POWER9-based in June 2019) and six (only four as of June 2019) on Fujitsu-designed SPARC64 chips (one of which – the K computer – was 1st in 2011 without any GPUs (and is still 3rd on the HPCG list[8]). One computer is based on seemingly related Chinese designs: Sunway SW26010 also using Chinese co-processors; the latter ascended to 1st in 2016 (it has since been superseded by an IBM POWER-based system). Further, a few computers use another non-US design, the Japanese PEZY-SC (based on the British ARM[9]) as an accelerator paired with Intel's Xeon.

Two computers which first appeared on the list in 2018 are based on architectures never before seen on the Top500. One was a new x86-64 microarchitecture from Chinese vendor Sugon, using Hygon Dhyana CPUs (a collaboration between AMD and the Chinese, based on Zen) and is ranked 38th,[10] and the other was the first ever ARM-based computer on the list (then upgraded for June 2019) – using Cavium ThunderX2 CPUs.[11] Before the ascendancy of 32-bit x86 and later 64-bit x86-64 in the early 2000s, a variety of RISC processor families made up most 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) or Intel's x86-based Xeon Phi as coprocessors, has dominated the TOP500 because of better performance per watt ratios and higher absolute performance; it is almost required to make the top 10; the only recent exception being the aforementioned K computer.

 
Share of processor architecture families in TOP500 supercomputers by time trend

All the fastest supercomputers in the decade since the Earth Simulator supercomputer have used operating systems based on Linux. Since November 2017, all the listed supercomputers use an operating system based on the Linux kernel.[12][13]

Since November 2015, no computer on the list runs Windows. In November 2014, Windows Azure[14] 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 it also dropped off the list. It was ranked 436 in its last appearance on the list released in June 2015, while its best rank was 11 in 2008.[15] There are no longer any Mac OS computers on the list. It had at most five such systems at a time, one more than the Windows systems that came later, while the total performance share for Windows was higher. The relative performance share of the whole list was however similar, and never high for either.

It has been well over a decade since MIPS systems dropped entirely off the list[16] but the Gyoukou supercomputer that jumped to 4th place in November 2017 (after a huge upgrade) has MIPS as a small part of the coprocessors. Use of 2,048-core coprocessors (plus 8× 6-core MIPS, for each, that "no longer require to rely on an external Intel Xeon E5 host processor"[17]) make the supercomputer much more energy efficient than the other top 10 (i.e. it is 5th on Green500 and other such ZettaScaler-2.2-based systems take first three spots).[18] At 19.86 million cores, it is by far the biggest system: almost double that of the best manycore system in the TOP500, the Chinese Sunway TaihuLight, ranked 3rd.

TOP 500Edit

From the 52nd list (November 2018) to the 53rd list (June 2019), the Xeon Platinum-based Frontera is the only new supercomputer in the top 10 (at number 5) and the upgraded POWER9-based Lassen moved from 11th to 10th.[19] Titan and Sequoia became the last Blue Gene/Q models to drop out of the top10; they had been ranked 9th and 10th in the 52nd list (and 1st and 2nd in the November 2012, 40th list) and are now 12th and 13th.

"For the first time, all 500 systems deliver a petaflop or more on the High Performance Linpack (HPL) benchmark, with the entry level to the list now at 1.022 petaflops." However, for a different benchmark "Summit and Sierra remain the only two systems to exceed a petaflop on the HPCG benchmark, delivering 2.9 petaflops and 1.8 petaflops, respectively. The average HPCG result on the current list is 213.3 teraflops, a marginal increase from 211.2 six months ago."[20]

Of the top 11 computers in the 53rd Top500 list, six are in the top 25 of the June 2019 Green500 list (most energy-efficient supercomputers):

Summit is #2 in the Green500 and #1 in the Top500
AI Bridging Cloud (ABCI) is #3 in the Green500 and #8 in the Top500
PANGEA III is #6 in the Green500 and #11 in the Top500
Sierra is #7 in the Green500 and #2 in the Top500
Piz Daint is #17 in the Green500 and #6 in the Top500
Sunway TaihuLight is #25 in the Green500 and #3 in the Top500
Top 10 positions of the 53nd TOP500 in June 2019[21]
Rank Rmax
Rpeak
(PFLOPS)
Name Model Processor Interconnect Vendor Site
country, year
Operating system
1   148.600
200.795
Summit IBM Power System AC922 POWER9, Tesla V100 InfiniBand EDR IBM Oak Ridge National Laboratory
  United States, 2018
Linux (RHEL)
2   94.640
125.712
Sierra IBM Power System S922LC POWER9, Tesla V100 InfiniBand EDR IBM Lawrence Livermore National Laboratory
  United States, 2018
Linux (RHEL)
3   93.015
125.436
Sunway TaihuLight Sunway MPP SW26010 Sunway[22] NRCPC National Supercomputing Center in Wuxi
  China, 2016[22]
Linux (Raise)
4   61.445
100.679
Tianhe-2A TH-IVB-FEP Xeon E5–2692 v2, Matrix-2000[23] TH Express-2 NUDT National Supercomputing Center in Guangzhou
  China, 2013
Linux (Kylin)
5   23.516
38.746
Frontera Dell C6420 Xeon Platinum 8280 InfiniBand HDR Dell EMC Texas Advanced Computing Center
  United States, 2019
Linux (CentOS)
6   21.230
27.154
Piz Daint Cray XC50 Xeon E5-2690 v3, Tesla P100 Aries Cray Swiss National Supercomputing Centre
   Switzerland, 2016
Linux (CLE)
7   20.159
41.461
Trinity Cray XC40 Xeon E5–2698 v3, Xeon Phi 7250 Aries Cray Los Alamos National Laboratory
  United States, 2015
Linux (CLE)
8   19.880
32.577
AI Bridging Cloud Infrastructure[24] PRIMERGY CX2550 M4 Xeon Gold 6148, Tesla V100 InfiniBand EDR Fujitsu National Institute of Advanced Industrial Science and Technology
  Japan, 2018
Linux
9   19.477
26.874
SuperMUC[25] ThinkSystem SD530 Xeon Platinum 8174 (plus e.g. 32 cloud GPU nodes with Tesla V100[26]) Intel Omni-Path Lenovo Leibniz Supercomputing Centre
  Germany, 2018
Linux (SLES)
10   18.200
23.047
Lassen IBM Power System S922LC POWER9, Tesla V100 InfiniBand EDR IBM Lawrence Livermore National Laboratory
  United States, 2018
Linux (RHEL)

Legend:

  • 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 benchmarks 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. Computed in petaFLOPS.
  • Name – Some supercomputers are unique, at least on its location, and are thus named by their owner.
  • Model – The computing platform as it is marketed.
  • Processor – The instruction set architecture or processor microarchitecture, alongside GPU and accelerators when available.
  • Interconnect – The interconnect between computing nodes. InfiniBand is most used (38%) by performance share, while Gigabit Ethernet is most used (54%) by number of computers.
  • 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 located.
  • Year – The year of installation or last major update.
  • Operating system – The operating system that the computer uses.

Other rankingsEdit

Top countriesEdit

Numbers below represent the number of computers in the TOP500 that are in each of the listed countries.

Distribution of supercomputers in the TOP500 list by country (November 2018)
Country Systems
  China
229
  United States
108
  Japan
31
  United Kingdom
20
  France
18
  Germany
17
  Ireland
12
  Canada
8
  Italy
6
  Korea, South
6
  Netherlands
6
  Australia
5
  India
4
  Poland
4
  Sweden
4
  Russia
3
  Saudi Arabia
3
  Singapore
3
  South Africa
2
  Spain
2
   Switzerland
2
  Taiwan
2
  Brazil
1
  Czechia
1
  Finland
1

Systems ranked No. 1 since 1976Edit

Number of systemsEdit

By number of systems as of November 2018:[40]

New developments in supercomputingEdit

In November 2014, it was announced that the United States was developing two new supercomputers to exceed China's Tianhe-2 in its place 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.[41] On 10 April 2015, US government agencies banned selling chips, from Nvidia, to supercomputing centers in China as "acting contrary to the national security ... interests of the United States";[42] and Intel Corporation from providing Xeon chips to China due to their use, according to the US, in researching nuclear weapons – research to which US export control law bans US companies from contributing – "The Department of Commerce refused, saying it was concerned about nuclear research being done with the machine."[43]

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.[44]

In June 2016, Japanese firm Fujitsu announced at the International Supercomputing Conference that its future exascale supercomputer will feature processors of its own design that implement the ARMv8 architecture. The Flagship2020 program, by Fujitsu for RIKEN plans to break the exaflops barrier by 2020 (and "it looks like China and France have a chance to do so and that the United States is content – for the moment at least – to wait until 2023 to break through the exaflops barrier."[45]) These processors will also implement extensions to the ARMv8 architecture equivalent to HPC-ACE2 that Fujitsu is developing with ARM Holdings.[45]

In June 2016, Sunway TaihuLight became the No. 1 system with 93 petaflop/s (PFLOP/s) on the Linpack benchmark.[46]

In November 2016, Piz Daint was upgraded, moving it from 8th to 3rd, leaving the USA with no systems under the TOP3 for only the 2nd time ever.[47][48]

Inspur has been one of the largest HPC system manufacturer based out of Jinan, China. As of May 2017, Inspur has become the third manufacturer to have manufactured 64-way system – a record which has been previously mastered by IBM and HP. The company has registered over $10B in revenues and have successfully provided a number of HPC systems to countries outside China such as Sudan, Zimbabwe, Saudi Arabia, Venezuela. Inspur was also a major technology partner behind both the supercomputers from China, namely Tianhe-2 and Taihu which lead the top 2 positions of Top500 supercomputer list up to November 2017. Inspur and Supermicro released a few platforms aimed at HPC using GPU such as SR-AI and AGX-2 in May 2017.[49]

In November 2017, for the second time in a row there were no system from the USA under the TOP3. #1 and #2 were installed in China, a system in Switzerland at #3, and a new system in Japan was #4 pushing the top US system to #5.[50]

In June 2018, Summit, an IBM-built system at the Oak Ridge National Laboratory (ORNL) in Tennessee, USA, took the #1 spot with a performance of 122.3 petaflop/s (PFLOP/s), and Sierra, a very similar system at the Lawrence Livermore National Laboratory, CA, USA took #3. These two system took also the first two spots on the HPCG benchmark. Due to Summit and Sierra, the USA took back the lead as consumer of HPC performance with 38.2% of the overall installed performance while China was second with 29.1% of the overall installed performance. For the first time ever the leading HPC manufacturer is not a US company. Lenovo took the lead with 23.8 percent of systems installed. It is followed by HPE with 15.8 percent, Inspur with 13.6 percent, Cray with 11.2 percent, and Sugon with 11 percent. [51]

On 18 March 2019, the United States Department of Energy and Intel announced the first exaFLOP supercomputer would be operational at Argonne National Laboratory by the end of 2021. The computer, named "Aurora" is to be delivered to Argonne by Intel and Cray.[52][53]

On 7 May 2019, The U.S. Department of Energy announced a contract with Cray Inc. to build the "Frontier" supercomputer at Oak Ridge National Laboratory. Frontier is anticipated to be operational in 2021 and, with a performance of greater than 1.5 exaflops, should then be the world’s most powerful computer.[54]

As of June 2019, all TOP500 systems deliver a petaflop or more on the High Performance Linpack (HPL) benchmark, with the entry level to the list now at 1.022 petaflops.[55]

Large machines not on the listEdit

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[56] because they do not feel it accurately indicates the ability for any system to be able to do useful work.[57] 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 have dropped off the listEdit

IBM Roadrunner[58] is no longer on the list (nor is any other using the Cell coprocessor, or PowerXCell).

Although Itanium-based systems reached second rank in 2004,[59][60] none now remain.

Similarly (non-SIMD-style) vector processors (NEC-based such as the Earth simulator that was fastest in 2002[61]) have also fallen off the list. Also the Sun Starfire computers that occupied many spots in the past now no longer appear.

The last non-Linux computers on the list – the two AIX ones – running on POWER7 (in July 2017 ranked 494th and 495th[62] originally 86th and 85th), dropped off the list in November 2017.

See alsoEdit

ReferencesEdit

  1. ^ A. Petitet, R. C. Whaley, J. Dongarra, A. Cleary (24 February 2016). "HPL – A Portable Implementation of the High-Performance Linpack Benchmark for Distributed-Memory Computers". ICL – UTK Computer Science Department. Retrieved 22 September 2016.CS1 maint: Uses authors parameter (link)
  2. ^ "An Interview with Jack Dongarra by Alan Beck, editor in chief HPCwire". Archived from the original on 28 September 2007.
  3. ^ a b "Statistics on Manufacturers and Continents".
  4. ^ "The TOP25 Supercomputer Sites". Archived from the original on 23 January 2016. Retrieved 4 January 2015.CS1 maint: Unfit url (link)
  5. ^ "Where does Asia stand? This rising supercomputing power is reaching for real-world HPC leadership". Retrieved 4 January 2015.
  6. ^ Rpeak – This is the theoretical peak performance of the system. Measured in PFLOPS.
  7. ^ "Sublist Generator". Retrieved 26 June 2018.
  8. ^ "HPCG - June 2019 | TOP500 Supercomputer Sites". www.top500.org. Retrieved 29 June 2019.
  9. ^ "PEZY-SC - PEZY". wikichip.org. Retrieved 20 February 2019.
  10. ^ "Advanced Computing System(PreE) - Sugon TC8600, Hygon Dhyana 32C 2GHz, Deep Computing Processor, 200Gb 6D-Torus | TOP500 Supercomputer Sites". www.top500.org. Retrieved 6 December 2018.
  11. ^ "Astra - Apollo 70, Cavium ThunderX2 CN9975-2000 28C 2GHz, 4xEDR Infiniband | TOP500 Supercomputer Sites". www.top500.org. Retrieved 6 December 2018.
  12. ^ "Top500 – List Statistics". www.top500.org. November 2017.
  13. ^ "Linux Runs All of the World's Fastest Supercomputers". The Linux Foundation. Retrieved 30 November 2017.
  14. ^ "Microsoft Windows Azure".
  15. ^ "Magic Cube – Dawning 5000A, QC Opteron 1.9 GHz, Infiniband, Windows HPC 2008".
  16. ^ "ORIGIN 2000 195/250 MHz | TOP500 Supercomputer Sites". www.top500.org. Retrieved 15 November 2017.
  17. ^ "PEZY-SC2 - PEZY". Retrieved 17 November 2017.
  18. ^ "The 2,048-core PEZY-SC2 sets a Green500 record". WikiChip Fuse. 1 November 2017. Retrieved 15 November 2017. Powering the ZettaScaler-2.2 is the PEZY-SC2. The SC2 is a second-generation chip featuring twice as many cores – i.e., 2,048 cores with 8-way SMT for a total of 16,384 threads. [..] The first-generation SC incorporated two ARM926 cores and while that was sufficient for basic management and debugging its processing power was inadequate for much more. The SC2 uses a hexa-core P-Class P6600 MIPS processor which share the same memory address as the PEZY cores, improving performance and reducing data transfer overhead. With the powerful MIPS management cores, it is now also possible to entirely eliminate the Xeon host processor. However, PEZY has not done so yet.
  19. ^ "June 2019 | TOP500 Supercomputer Sites". www.top500.org. Retrieved 29 June 2019.
  20. ^ "TOP500 Becomes a Petaflop Club for Supercomputers | TOP500 Supercomputer Sites". www.top500.org. Retrieved 29 June 2019.
  21. ^ "TOP500 Supercomputer Sites". June 2019.
  22. ^ a b "China Tops Supercomputer Rankings with New 93-Petaflop Machine – TOP500 Supercomputer Sites".
  23. ^ "Matrix-2000 - NUDT - WikiChip". en.wikichip.org. Retrieved 19 July 2019.
  24. ^ ABCI. "ABCI". AI Bridging Cloud Infrastructure. National Institute of Advanced Industrial Science and Technology (AIST). Retrieved 25 June 2018.
  25. ^ SuperMUC-NG. "SuperMUC-NG". Leibniz Supercomputing Centre. Leibniz-Rechenzentrum. Retrieved 14 November 2018.
  26. ^ "Hardware of SuperMUC-NG". Leibniz-Rechenzentrum (LRZ). Retrieved 29 June 2019.
  27. ^ "TOP500 Supercomputer Sites". November 2018.
  28. ^ "TOP500 Supercomputer Sites". June 2018.
  29. ^ "TOP500 Supercomputer Sites". November 2017.
  30. ^ "TOP500 Supercomputer Sites". June 2017.
  31. ^ "TOP500 Supercomputer Sites". June 2016.
  32. ^ "TOP500 Supercomputer Sites". November 2015.
  33. ^ "TOP500 Supercomputer Sites". June 2015.
  34. ^ "TOP500 Supercomputer Sites". November 2014.
  35. ^ Summit, an IBM-built supercomputer now running at the Department of Energy’s (DOE) Oak Ridge National Laboratory (ORNL), captured the number one spot June 2018 with a performance of 122.3 petaflops on High Performance Linpack (HPL), the benchmark used to rank the TOP500 list. Summit has 4,356 nodes, each one equipped with two 22-core Power9 CPUs, and six NVIDIA Tesla V100 GPUs. The nodes are linked together with a Mellanox dual-rail EDR InfiniBand network."TOP500 List - June 2018". The TOP500 List of the 500 most powerful commercially available computer systems known. The TOP500 project. 30 June 2018. Retrieved 10 July 2019.
  36. ^ Advanced reports that Oak Ridge National Laboratory was fielding the world’s fastest supercomputer were proven correct when the 40th edition of the twice-yearly TOP500 List of the world’s top supercomputers was released today (Nov. 12, 2012). Titan, a Cray XK7 system installed at Oak Ridge, achieved 17.59 Petaflop/s (quadrillions of calculations per second) on the Linpack benchmark. Titan has 560,640 processors, including 261,632 NVIDIA K20x accelerator cores."TOP500 List - November 2012". The TOP500 List of the 500 most powerful commercially available computer systems known. The TOP500 project. 12 November 2012. Retrieved 10 July 2019.
  37. ^ For the first time since November 2009, a United States supercomputer sits atop the TOP500 list of the world’s top supercomputers. Named Sequoia, the IBM BlueGene/Q system installed at the Department of Energy’s Lawrence Livermore National Laboratory achieved an impressive 16.32 petaflop/s on the Linpack benchmark using 1,572,864 cores."TOP500 List - June 2012". The TOP500 List of the 500 most powerful commercially available computer systems known. The TOP500 project. 30 June 2012. Retrieved 10 July 2019.
  38. ^ The DOE/IBM BlueGene/L beta-System was able to claim the No. 1 position on the new TOP500 list with its record Linpack benchmark performance of 70.72 Tflop/s (“teraflops” or trillions of calculations per second). This system, once completed, will be moved to the DOE’s Lawrence Livermore National Laboratory in Livermore, Calif."TOP500 List - November 2004". The TOP500 List of the 500 most powerful commercially available computer systems known. The TOP500 project. 30 November 2004. Retrieved 10 July 2019.
  39. ^ ASCI Red a Sandia National Laboratories machine with 7264 Intel cores nabbed the #1 position in June of 1997."TOP500 List -June 1997". The TOP500 List of the 500 most powerful commercially available computer systems known. The TOP500 project. 30 June 1997. Retrieved 10 July 2019.
  40. ^ "List Statistics". Retrieved 14 November 2018.
  41. ^ Balthasar, Felix. "US Government Funds $425 million to build two new Supercomputers". News Maine. Archived from the original on 19 November 2014. Retrieved 16 November 2014.
  42. ^ "Nuclear worries stop Intel from selling chips to Chinese supercomputers". CNN. 10 April 2015. Retrieved 17 August 2016.
  43. ^ "US nuclear fears block Intel China supercomputer update".
  44. ^ "Executive Order -- Creating a National Strategic Computing Initiative" (Executive order). The White House – Office of the Press Secretary. 29 July 2015. Archived from the original on 30 November 2018.
  45. ^ a b Morgan, Timothy Prickett. "Inside Japan's Future Exascale ARM Supecomputer". The Next Platform. Retrieved 13 July 2016.
  46. ^ "Highlights - June 2016 | TOP500 Supercomputer Sites". www.top500.org.
  47. ^ "Highlights - June 2017 | TOP500 Supercomputer Sites". www.top500.org.
  48. ^ "TOP500 List Refreshed, US Edged Out of Third Place | TOP500 Supercomputer Sites". www.top500.org.
  49. ^ "Supermicro, Inspur, Boston Limited Unveil High-Density GPU Servers | TOP500 Supercomputer Sites". www.top500.org. Retrieved 13 June 2017.
  50. ^ "Highlights - November 2017 | TOP500 Supercomputer Sites". www.top500.org.
  51. ^ "Highlights - June 2018 | TOP500 Supercomputer Sites". www.top500.org.
  52. ^ "U.S. Department of Energy and Intel to deliver first exascale supercomputer1". Argonne National Laboratory. 18 March 2019. Retrieved 27 March 2019.
  53. ^ Clark, Don (18 March 2019). "Racing Against China, U.S. Reveals Details of $500 Million Supercomputer". The New York Times.
  54. ^ "U.S. Department of Energy and Cray to Deliver Record-Setting Frontier Supercomputer at ORNL". Oak Ridge National Laboratory. 8 May 2019. Retrieved 8 May 2019.
  55. ^ "TOP500 Becomes a Petaflop Club for Supercomputers | TOP500 Supercomputer Sites". www.top500.org.
  56. ^ Blue Waters Opts Out of TOP500 (article), 16 November 2012
  57. ^ 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), 19–23 September 2012, Minneapolis, MN, US
  58. ^ "Roadrunner – BladeCenter QS22/LS21 Cluster, PowerXCell 8i 3.2 GHz / Opteron DC 1.8 GHz, Voltaire Infiniband". Retrieved 4 January 2015.
  59. ^ "Thunder – Intel Itanium2 Tiger4 1.4GHz – Quadrics". Retrieved 4 January 2015.
  60. ^ "Columbia – SGI Altix 1.5/1.6/1.66 GHz, Voltaire Infiniband". Retrieved 4 January 2015.
  61. ^ "Japan Agency for Marine -Earth Science and Technology". Retrieved 4 January 2015.
  62. ^ "IBM Flex System p460, POWER7 8C 3.550GHz, Infiniband QDR". TOP500 Supercomputer Sites.

External linksEdit