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1.1 The new list of the TOP500 systems

Since the last TOP500 [3] report the list has changed on quite some points. In this section we indicate the systems that have dropped out and we describe the architectures that have come in newly. The new list is given in Table 1.1

Table 1.1: Number of Systems Installed

**Table 1.1:** Machines are ordered by frequency of occurrence (N). is the cumulative maximum observed performance, is the cumulative theoretical peak performance for each system type. First, medium, and last are the first, median, and last entries of the a system type in the TOP500 list ordered by performance. The system that appear for the first time in the table are marked with a *.
	N			first	medium	last
SP2	114	851.3	1265.4	6	269	491
Power Chall	109	362.2	465.5	240	378	475
C90	52	480.2	538.1	60	179	500
T3D	32	666.2	998.2	4	113	388
CM5	23	313.7	685.5	10	157	295
Paragon	21	293.7	431.3	2	174	377
VPP500	19	690.2	872.8	1	89	203
SX3	18	194.5	216.8	39	175	422
Po.Ch.-Array*	16	160.9	250.0	30	144	390
VP2000	14	55.4	70.0	273	286	332
GC/PP	10	49.3	94.7	128	283	478
SPP1000	10	33.1	92.8	354	359	363
S-3800	9	157.7	176.0	27	86	156
iPSC/860	8	20.8	41.0	492	496	499
Triton90*	8	38.8	48.6	191	245	419
SPP1200*	7	25.1	55.7	298	327	485
CM200	5	34.6	70.0	119	183	226
CS	5	20.6	86.4	221	327	484
Paragon SMP*	5	203.8	246.4	3	55	102
C4/XA	3	8.7	9.7	423	424	425
KSR2	3	12.6	16.6	235	269	287
CM2	2	10.4	28.0	216	217	217
SP1	2	9.6	32.0	233	234	234
SX4*	2	76.2	80.0	9	31	52
AlphaServer	1	5.0	7.2	227	227	227
CM5E	1	7.7	20.0	135	135	135
KSR1	1	3.4	5.1	348	348	348
Total	500	4785.4	6903.8

Mannheim/Tennessee November 10, 1995

The following systems have dropped from the list:

-: Cray Computer Corporation: Cray-2, Cray-3.
-: Cray Research Inc.: Cray Y-MP, Cray M90, CS6400.
-: Hitachi: S820, S3600.
-: IBM: ES/9000.
-: Maspar: MP2.
-: Meiko: CS/i860.
-: nCUBE: nCUBE2.
-: Silicon Graphics: Challenge.

Twelve systems in all. Of these 7 systems are (multi-)vector processors: all Cray systems, except the CS6400, the Hitachi systems, and the IBM system. The Cray CS6400 and the Silicon Graphics Challenge are shared memory symmetric multi-processor systems. The Maspar MP2 is of the processor-array type. The Meiko CS/i860 and the nCUBE2 are both distributed memory MIMD machines.

For the description of the various types of architectures one is referred to [3] or [2]. In this section we only describe the machines that appear for the first time in Table 1.1 in alphabetical order. For the descriptions of the other systems are given in [3]. Apart from the systems parameter list that is given for each system also the values of tex2html_wrap_inline253 and tex2html_wrap_inline251 as available from [1] are quoted together with the number of nodes associated with these values. The reason that the system parameter list is not sufficient is that the maximal theoretical peak performance is given for the maximal configuration of a system. Such a system may not actually exist.

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top500@rz.uni-mannheim.de
Tue May 28 14:38:25 PST 1996