Analyzing the Impact of Supporting Out-of-Order Communication on In-order Performance with iWARP

faults and congestion in high-end computing systems, supporting multiple network communication paths is becoming increasingly important. However, multi-path communicationcomeswiththedisadvantageofout-oforderarrivalofpackets(becausepacketsmaytraverse differentpaths).Whilemodernnetworkingstackssuchas theInternetWide-AreaRDMAProtocol(iWARP)over 10-GigabitEthernet(10GE)supportmulti-pathcommunication, their current implementations do not handle out-of-order packets primarily owing to the overhead onin-ordercommunicationthatitadds.Specifically,in iWARP,supportingout-of-orderpacketsrequiresevery packettocarryadditionalinformationcausingsignificant overheadonpacketsthatarrivein-order.Thus,inthis paper,weanalyzethetrade-offsindesigningafeaturecompleteiWARPstack,i.e.,onethatprovidessupport forout-of-orderarrivingpackets,andthus,multi-path systems,whilefocusingontheperformanceofin-order communication.Weproposethreefeature-completedesignsofiWARPandanalyzetheprosandconsofeach ofthesedesigns usingperformanceexperimentsbased onseveralmicro-benchmarksaswellasaniso-surface visualrenderingapplication.Ouranalysisrevealsthat theiWARPdesignprovidingthebestoverallperformance dependsontheparticularcharacteristicsoftheupper layersandthatdifferentdesignsareoptimalbasedon themetricofinterest

Spinal motoneuron size and anatomical symmetry in hind limb of forgs

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Ohio State University (OSU-CISRC-2/06-TR19) Understanding the Significance of Network Performance in End Applications: A Case Study with

Due to the low speeds of earlier generation networks such as Fast Ethernet, network communication was considered to be one of the primary bottlenecks in cluster computing. Accordingly, researchers used a number of techniques to hide the communication overheads in networks. In order to alleviate this problem, several researchers and industries proposed and implemented faster networks such as Gigabit Ethernet (GigE). This trend soon led to the development of even higher speed networks such as 10-Gigabit Ethernet (10GigE) and InfiniBand (IBA). Today, industries are taking the next step in high-speed networking with multi tengigabit networks such as the Mellanox 20-Gigabit IBA DDR adapters, IBM 30-Gigabit IBA adapters, etc. Many of these innovations emerged due to the underlying assumption that the network is still one of the primary bottlenecks in cluster computing. However, whether this assumption is in fact a reality for current environments is yet to be understood. In this paper, we take a step back to understand if such multi-gigabit network speeds justify the cost of these newer networks with respect to the performance gains they provide for end applications. Specifically, we perform comparative analysis with conventional 1-GigE adapters