[Beowulf] SCI Socket latency: 2.27 microseconds

Petter Gustad pegu at dolphinics.no
Mon Mar 1 03:45:32 EST 2004

Taken from:


Dolphin SCI Socket Software Delivers
Record Breaking Latency

New evaluation kit available at special pricing

Clinton, MA and Oslo, Norway, Feb 26, 2004 Dolphin Interconnect today
announced that the SCI Socket version 1.0 software library is now
available to customers for high-performance computing applications
interconnected with Dolphin SCI adapters. SCI Socket enables standard
Berkley sockets to use the Scalable Coherent Interface (SCI) as a
transport medium with its high bandwidth and extremely low latency.

"This is the lowest latency socket solution available today," said
Hugo Kohmann, CTO for Dolphin Interconnect. "SCI Socket opens new
high-performance possibilities for a broad range of networking

Dolphin has benchmarked a completed one byte socket send/socket
receive latency at 2.27 microseconds, which corresponds to more than
203,800 roundtrip transactions per second. Benchmarks using Netperf
also show more than 255 MBytes (2,035 Megabits/s) sustained throughput
using standard TCP STREAM sockets. The SCI Socket software uses
Dolphin's SISCI API as its transport and most of the communication
takes place in user space, avoiding time-consuming system calls and
networking protocols. SCI remote memory access provides a fast and
reliable connection.

"These record-setting performance benchmarks underscore the
capabilities of the SCI standard as a high-performance interconnect,"
said Kare Lochsen, CEO of Dolphin Interconnect. "Dolphin has extensive
expertise in this technology having developed the first SCI-based
interconnect soon after it became a IEEE standard in 1992, and we
remain committed to keeping SCI at the most competitive performance
levels in the future."

SCI Socket requires no operating system patches or application
modifications to run the software. SCI Socket is open source software
available under LGPL/GPL and supports all popular Linux distributions
for x86 and x86/Opteron. In Dolphin testing, the lowest latency was
achieved using AMD Opteron (X86_64) processors. Support for UDP and
Microsoft Windows is planned.

Dolphin SCI adapters are used to build server clusters for
high-performance computing and in a wide range of embedded real-time
computing applications including reflective memory, simulation and
visualization systems, and systems requiring high-availability and
fast failover.

For a limited time, an evaluation kit consisting of two PCI-SCI
adapter cards and cables is available directly from Dolphin
Interconnect at a substantial discount. When installed in a user's
application platform, the evaluation kit enables effective testing of
the SCI Socket software. The software and documentation is included at
no charge. Please visit the Dolphin web site for more information at

foobar GmbH (www.foobar-cpa.de), a software development and consulting
firm with particular expertise in SCI and located in Chemnitz,
Germany, assisted Dolphin in the development of SCI Socket.

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