hpc3 is a cluster of 29 compute nodes and one front-end. Each compute node contains:
* 2 CPUs, * 2 GB of memory, * 12.5 GB of temporary local disk space accesible as $TMPDIR under PBS * a fact ethernet connection for I/O to the shared filesystem and for PBS communication * a Myrinet network interface card which provides low-latency (7.6 micro-sec) and high bandwidth 240 MB/sec for one-way or 430 MB/sec. for two way messages. The front end machine contains a single CPU ansd 2 GB memory.
Each CPU is a DEC Alpha EV6.7 processor running at 833 MHz (peak theoretical 1.666 Gflops), and has separate on-chip 64 KB data and instruction caches, and a 4 MB off chip unified cache.
The pair of CPUs within a node share the 2 Gigabytes of memory. Unlike the Origins, memory from other nodes is not accessible except via message passing.
| CPU | CPU speed | Cache/CPU | Total Memory | Swap | Local Disk | Total Shared Disk |
|---|---|---|---|---|---|---|
| Alpha EV6.7 | 58 @ 833 Mhz | 4 MB/proc | 58 GB | 2 GB/node | 12.5 GB/node | 2 TB |
External Network connection: hpc3 is equipped with a Fast Ethernet connection to the campus backbone for access to on-campus servers. It is NOT accessible from off-campus. hpc3 is also connected via a private fast ethernet switch to the other nodes. The fileserver is connected to the switch via a private gigabit ethernet connection. Access to the fileserver is through NFS version 3 through hpc3 or one of the nodes. Access to the compute nodes is only through PBS via hpc3. No files are crossmounted with hpc1 or hpc2. The password is synchronized from hpc3 to the other nodes. Use passwd on hpc3 and it will be reflected to the other nodes. Passwords on hpc3 are not kept syncronized with hpc1 and 2.