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http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600257

Kurzfassung in Englisch

This work covers the implementation of a raw Ethernet communication module
for the Open MPI message passing library. Thereby it focuses on both the reduction of the
communication latency for small messages and maximum possible compatibility.
Especially the need for particular network devices, adapted network device drivers or
kernel patches is avoided. The work is divided into three major parts: First, the
networking subsystem of the version 2.6 Linux kernel is analyzed. Second, an Ethernet
protocol family is implemented as a loadable kernel module, consisting of a basic
datagram protocol (EDP), providing connection-less and unreliable datagram transport,
and a streaming protocol (ESP), providing connection-oriented, sequenced and reliable
byte streams. The protocols use the standard device driver interface of the Linux kernel
for data transmission and reception. Their services are made available to user-space
applications through the standard socket interface. Last, the existing Open MPI TCP
communication module is ported atop the ESP. With bare EDP/ESP sockets a message
latency of about 30 us could be achieved for small messages, which compared to the
TCP latency of about 40 us is a reduction of 25 %.

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