Announcements
17 February 2011
The Nvidia CUDA development kit has been updated to version 4.1.
24 Jan 2012
DAS-4/ASTRON has succesfully correlated three hours of data coming from 288 LOFAR antennas, possibly setting a world record.
13 Jan 2012
The GPU page documents how the OpenCL implementations on DAS-4 can be used.
15 November 2011
DAS-4/VU achieved the 16th place on the Graph500 list. A very good result, as all higher-ranked systems are significantly bigger.
11 May 2011
DAS-4 supports the OpenNebula package for Cloud computing.
DAS-4 Connectivity
An important innovative aspect of the DAS-4 system is the wide-area communications infrastructure between the clusters. Each cluster has 1Gbps of connectivity to the regular Internet through its local University and then on to SURFnet. To satisfy higher demands in bandwidth, transparency and latency, however, the StarPlane project collaborates with SURFnet to enable DAS-4 to use dedicated 10Gbps lightpaths across SURFnet's DWDM backbone between clusters.
DAS-4 Local Network Architecture
For external connectivity, each cluster has a LAN connection to the local university and a direct WAN connection to SURFnet. The head node and the cluster nodes connect to the LAN with Ethernet interfaces: 1 Gbit/s Ethernet for the cluster nodes and 10 Gbit/s Ethernet for the head node. We are particularly interested in the WAN connectivity to the SURFnet6 network, as it provides lightpaths through the optical infrastructure. The WAN connections go via a special router node. Both the head node and the cluster nodes use InfiniBand to connect with the local router.