Purple in the News
The information below describes the
configuration and architecture prior to the development of the complete ASC Purple
IBM will deliver the new high-speed, low-latency Federation Interconnect for
communications between SMPs, achieving in excess of 8 GB/s peak bi-directional
bandwidth. Each SMP has 32 GiB (32×230 or 3.44×109 bytes)
of memory. The entire Purple system will have 50 TiB (50×240 or
5.50×1013 bytes) of memory and 2.0 PB (2.0×1015 or
two petabytes) of globally accessible disk. This is the equivalent of 25,000
high-end personal computers.
Some of the hardware from the ASC Purple contract is already operational.
An Early Demonstration of Technology Vehicle (pEDTV) has been delivered to LLNL.
pEDTV is based on IBM's p655+ nodes with dual planes of Federation interconnect.
This dual plane Federation interconnect is similar to Purple but is only a dual
stage switch, not the full three stage Federation switch required for Purple.
The p655+ nodes have eight Power4+ processors running at 1.5 GHz and 16 GiB of
memory and 2×145.6 GB of local disk configured to allow booting of two
completely different software releases or patch levels. This machine is being
used to drive the Federation schedule and to debug the Federation adapters, switch,
and software components. It is also being used to study and improve the performance
of the Federation interconnect on ASC applications. Currently, pEDTV is split
into two machines—UM,
a 128-node machine on the Secure Computing Facility (SCF) network, and UV,
a 128-node cluster on the Open Computing Facility (OCF) network. UM and UV each
have 70 TB of global disk available to all compute nodes via IBM's General Parallel
File System (GPFS). Each machine also has 12×1 Gb/s Ethernet for parallel
FTP transfer of user data to the archive.
Purple will require 7.5 MW of electrical power for the computer and cooling
equipment, the equivalent electrical power of 7,500 average homes. Additionally,
the full system is expected to generate more than 16,000,000 Btu/h in heat, requiring
new air-handling designs and specifications.
to the Archive for additional
hardware architecture and configuration information.
|ASC Purple At a Glance
||Peak computational rate
|50 TB (50×240 bytes)
|2.0 PB (2.0×1015 bytes)
||Aggregate global disk
|122 GB/s (122 ×109 bytes/seconds)
||Delivered global I/O bandwidth to applications
|12.3 TB/s (12.3×1012 bytes/seconds)
||Aggregate intra-SMP link bandwidth
|223 (443) TB (in 1012 bytes)
||Aggregate local disk (mirrored) capacity
||Number of disk drives in the system
|92 GB/s (92 ×109 bytes/seconds)
||Delivered aggregate local I/O bandwidth to applications
|32 x 10-Gb/s Ethernet (in 109 bits/seconds)
||Number of processors
|7.5 MW (7.5×106 Watts)
||Power required for computer and cooling