DocumentCode :
3612769
Title :
On whether OCS maximizes application throughput in all-optical datacenter networks
Author :
Argibay-Losada, Pablo Jesus ; Sahin, Gokhan ; Kitayama, Ken-ichi ; Chunming Qiao
Author_Institution :
Dept. of Comput. Sci. & Eng., SUNY Buffalo, Buffalo, NY, USA
Volume :
7
Issue :
12
fYear :
2015
Firstpage :
1135
Lastpage :
1147
Abstract :
Packet switching and circuit switching are the two main ways to operate all-optical networks in datacenters (DCs). Although optical circuit switching (OCS) is not a good fit for all scenarios, it is often considered appropriate for managing large flows. On the other hand, options based on packet switching, such as optical packet switching (OPS) or optical burst switching (OBS), are considered suitable mainly for small flows at best due to their lack of random-access buffers to manage packet contention. We accordingly study the throughput that applications can achieve in an all-optical DC network composed of fast all-optical switches, where large flows are managed by OCS and the rest by bufferless OPS. We focus on representative DC networks such as fat-trees, hypercubes, and rings, and take into account empirical application workloads, transport protocols, lack of RAM or fiber delay lines for buffering purposes in OPS switches, and characteristics of the network control plane. Surprisingly, we have found no scenario that requires OCS instead of OPS in order to increase application throughput; this holds even when all flows have unrealistically large sizes of tens of GB or larger. Counterintuitively, bufferless OPS offers much higher throughputs than OCS when managing large flows, and the lack of buffers in the OPS switches is irrelevant in this respect.
Keywords :
computer centres; optical burst switching; optical communication equipment; optical delay lines; optical fibre communication; optical switches; packet switching; OPS switches; RAM; all-optical datacenter networks; fiber delay lines; optical burst switching; optical circuit switching; optical packet switching; random-access buffers; High-speed optical techniques; Optical buffering; Optical fibers; Optical packet switching; Optical switches; Throughput; Datacenter; Optical burst switching; Optical circuit switching; Optical packet switching;
fLanguage :
English
Journal_Title :
Optical Communications and Networking, IEEE/OSA Journal of
Publisher :
ieee
ISSN :
1943-0620
Type :
jour
DOI :
10.1364/JOCN.7.001135
Filename :
7367912
Link To Document :
بازگشت