The C-DAC PARAM Padma.

Machine type	RISC-based distributed memory multi-processor.
Models	C-DAC PARAM Padma.
Operating system	AIX (IBM's Unix flavour), Linux
Connection structure	Clos network.
Compilers	Fortran 77/90, C, C++
Vendors information Web page	http://www.cdacindia.com/html/parampma.asp
Year of introduction	2003.

System parameters:

Model	C-DAC PARAM Padma
Clock cycle	1 GHz
Theor. peak performance
Per Proc. (Gflop/s)	4
Maximal (Gflop/s)	1024
Memory	500 GB
No. of processors	248
Comm. bandwidth
Aggregate	4 GB/s
Point-to-point	312 MB/s

Remarks:

The PARAM Padma is the newest systems made by the Indian C-DAC. It is built somewhat asymmetrically from 54 4-processor SMPs and 1 32-processor node. All nodes employ 1 GHz IBM POWER4 processors. As an interconnection network C-DACs own PARAMnet-II is used for which a peak bandwidth of 2.5 Gb/s (312 MB/s) is given with a latency for short messages of ≅ 10 µs. The network is build from 16-port PARAMnet-II switches and has a Clos64 topology, very similar to the structure used by Myrinet. No MPI results over this network are available.
C-DAC has already a long tradition of building parallel machines and it has always provided its own software to go with them. Therefore, the Padma comes with Fortran 90, C(++), MPI, and a Parallel Files System.

Measured Performances:
The Padma performs at 532 Gflop/s with the HPC Linpack Benchmark (see [44]) for a linear system of size N = 224,000 on a 62-node machine with a theoretical peak of 992 Gflop/s. That amounts to an efficiency of 53.6% for this benchmark.

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