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, a portable implementation of the high-performance LINPACK benchmark written in Fortran for distributed-memory computers. In the most recent list (June 2017), the Chinese Sunway TaihuLight is the world's 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 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.
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:
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 grown steadily in accordance with Moore's law, doubling roughly every 14 months. As of November 2014[update], Tianhe-2 was fastest with an Rpeak of 54.9024 PFLOPS. For comparison, this is over 419,102 times faster than the Connection Machine CM-5/1024 (1024 cores), which was the fastest system in November 1993 (twenty-one years prior) with an Rpeak of 131.0 GFLOPS.
As of November 2016[update], TOP500 supercomputers are now all 64-bit, mostly 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) including 22 supercomputers based on Power Architecture used by IBM POWER microprocessors, seven SPARC (all with Fujitsu-designed SPARC-chips, one of which surprisingly made the top in 2011 without a GPU, currently ranked seventh), and two, seemingly related, Chinese designs: the ShenWei-based (ranked 11 in 2011, ranked 158th in November 2016) and Sunway SW26010-based ranked 1 in 2016, making up the remainder (another non-US design is PEZY-SC, while it is an accelerator paired with Intel's Xeon). Before the ascendance 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) 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. An x86-based coprocessor, Xeon Phi, has also been used.
All the fastest supercomputers in the decade since the Earth Simulator supercomputer have used operating systems based on Linux. Since November 2017[update], all the listed supercomputers (100% of the performance share) use an operating system based on the Linux kernel.
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 it also dropped off the list. It had been ranked 436 in its last appearance on the list released in June 2015, while its best rank was 11 in 2008.
It has been well over a decade since MIPS-based systems (meaning used as host CPUs) dropped entirely off the list 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 2048-core coprocessors (plus 8× 6-core MIPS, for each, that "no longer require to rely on an external Intel Xeon E5 host processor") 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; Piz Daint is the only other system just barely making 10th on that list, of those below). At 19.86 million cores, it is by far the biggest system, almost double the 1st ranked system – the Chinese manycore system.
|Sunway TaihuLight||Sunway MPP||SW26010||Sunway||NRCPC||National Supercomputing Center in Wuxi
|Tianhe-2||TH-IVB-FEP||Xeon E5–2692, Xeon Phi 31S1P||TH Express-2||NUDT||National Supercomputing Center in Guangzhou
|Piz Daint||Cray XC50||Xeon E5-2690v3, Tesla P100||Aries||Cray||Swiss National Supercomputing Centre
|Gyoukou||ZettaScaler-2.2 HPC system||Xeon D-1571, PEZY-SC2||Infiniband EDR||ExaScaler||Japan Agency for Marine-Earth Science and Technology
|Titan||Cray XK7||Opteron 6274, Tesla K20X||Gemini||Cray||Oak Ridge National Laboratory
United States, 2012
|Linux (CLE, SLES based)|
|Sequoia||Blue Gene/Q||A2||Custom||IBM||Lawrence Livermore National Laboratory
United States, 2013
|Linux (RHEL and CNK)|
|Trinity||Cray XC40||Xeon E5–2698v3, Xeon Phi||Aries||Cray||Los Alamos National Laboratory
United States, 2015
|Cori||Cray XC40||Xeon Phi 7250||Aries||Cray||National Energy Research Scientific Computing Center
United States, 2016
|Oakforest-PACS||Fujitsu||Xeon Phi 7250||Intel Omni-Path||Fujitsu||Kashiwa, Joint Center for Advanced High Performance Computing
|K computer||Fujitsu||SPARC64 VIIIfx||Tofu||Fujitsu||Riken, Advanced Institute for Computational Science (AICS)
Numbers below represent the number of computers in the TOP500 that are in each of the listed countries.
|Country||Nov 2017||Jun 2017||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|
By vendor share June:
Note, all operating systems of the TOP500 systems use Linux, but Linux above is generic Linux.
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. 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"; 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."
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.
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.") These processors will also implement extensions to the ARMv8 architecture equivalent to HPC-ACE2 that Fujitsu is developing with ARM Holdings.
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 Arab, Venezuela. Inspur was also a major technology partner behind both the supercomputers from China, namely Tianhe-2 and Taihu which leads the top 2 positions of Top500 supercomputer list of December 2016. Inspur and Supermicro released a few platforms aimed at HPC using GPU such as SR-AI and AGX-2 in May 2017.
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 indicates 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.
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 only because the stated performance numbers are no longer high enough, while in principle, 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 (non-SIMD-style) 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.|
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 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.