The Texas Advanced Computing Center (TACC) at the University of Texas at Austin at the 2015 Global Supercomputing Conference (SC15) in Austin unveiled a DC-driven high-performance computer (HPC) installed on its campus. "Hikari (light)". According to TACC, "it has only just begun to run for about a week. In the TACC with multiple supercomputers, it has the highest power saving performance."
TACC Supercomputer "Hikari"
Hikari is an HPC prototyped by HP's "HPE Apollo 8000" series. The processor uses Intel's Haswell architecture Xeon, utilizing more than 10,000 cores. The interconnect technology uses an EDR Infiniband with a transmission speed of about 25 Gbps per channel. The performance is about 400TFLOP.
From the above performance parameters alone, Hikari is only equivalent to the TOP500 medium-level common system, but Hikari has two major characteristics, namely: (1) the use of water cooling system cooling device, (2) can use DC power supply drive, and about 300kW Photovoltaic power system connection.
Among them, (2) was achieved with the support of the Japanese New Energy Industry Technology Development Agency (NEDO) and the assistance of NTT FACILITIES. In general, HPC and data center servers receive power via a UPS (Uninterruptible Power Supply). Therefore, from the UPS to the processor, the total goes through three AC-DC or DC-AC conversions.
In the case of a DC power supply system, the output of the UPS is DC, and the DC power supply is directly supplied to the processor after DC-DC conversion in the server. Therefore, AC-DC conversion with more power loss is required. Counting connected solar panels can reduce AC-DC conversion by up to 4 times. In addition, the output voltage of the UPS used by Hikari is not 48V but 380V, so it is possible to use a finer supply cable and the power supply loss is even lower. According to TACC, "by using DC power supply, about 10% of electricity is saved."
The TACC did not disclose the overall power consumption of the system, but the 400 TFLOPS system has a power consumption of approximately 200 kW. With solar panels rated at 300kW, it is estimated that most of the daytime electricity needs can be met by the output of the solar panels. (Reporter: Nozawa Tetsuo)
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