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Mellanox MHES18-XS HCA Card Driver

Since a wide rang of parallel applications depend on this operation, an efficient implementation for the given hardware is of high importance.

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Based on the results of the analysis, optimizations for all-reduce algorithms shall be proposed. Known all-reduce algorithms will be investigated theoretically, using well-known communication models and practically on clusters. Finally a new algorithm shall be proposed. III There cannot exist a general non-adaptive all-reduce algorithm which is optimal in all possible scenarios.

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In combination with the open source operating system Linux and the Message Passing Interface MPI standard clusters of workstations have emerged as a powerful solution for solving scientific and business problems. Not only the lower costs but also the familiarity to a wide range of computer Mellanox MHES18-XS HCA Card and technicians, robustness, the accessibility of hard- and software designs and open standards make clusters based on commodity hardware the preferred choice for many scientific and business computing solutions.

This trend is reflected by the number of cluster systems in the Top computing list see Figure 1. Beginning with a small number incluster systems now dominate the list of the fastest public known supercomputers of Mellanox MHES18-XS HCA Card world. The downside is that one workstation can only host a limited Figure 1.

This is compensated by connecting hundreds or even thousands of them through an interconnect. Since most HPC applications need to 1 1 11 1 Introduction communicate between their processes to synchronize and share data, the network is a critical component in terms of application speed, scalability and cluster efficiency.

Thus, the interconnect should provide a high bandwidth and low latency Mellanox MHES18-XS HCA Card match the interprocess communication needs of the applications. In the beginning clusters Figure 1.

Top System Interconnect Family over Time image taken from www. Being the most used and therefore cheapest network technology, Ethernet was the first choice for cost efficient clusters.

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Today, interprocess communication of an application is most likely handled by an MPI library which provides an Application Programming Interface API to hide the complexity of communicating over a network and to make the application Mellanox MHES18-XS HCA Card more hardware independent and therefore portable. One of those functions is the all-reduce operation.

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It is used to calculate a result from input values of a number of processes so that after the operation has Mellanox MHES18-XS HCA Card all processes know the result. For example all processes of an application could search for the minimum of a function for different input values. After each process computed the result for its input values the 2 12 1 Introduction minimum is determined by suppling these results to the all-reduce operation which returns the minimum of all results.

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Thus, the MPI Allreduce function can have a heavy impact on the performance of an application and should therefore be as fast as possible under the given environment. Based on these benchmarks and the theoretical background from Chapter 1, several all-reduce algorithms are then presented end evaluated in Chapter 3.

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In Chapter 4 a new all-reduce algorithm is proposed and in Chapter 5 the results of this work are summarized. It specifies a portable standard for the communication between distinct processes by messages.

In the MPI-Forum released the first version: The processes are identified by a unique ID called rank and different messages are distinguished by a tag. Thus, the application calling either Mellanox MHES18-XS HCA Card these functions has to wait while the data is transferred over the network.

This may take a considerable amount of time which could have been used for computation by the application. These functions return immediately after initiating the send or receive operation. This allows the application to compute while waiting for the transfer operation to finish. Before the send buffer may be used again and the receive buffer is read the application must ensure that the operations Mellanox MHES18-XS HCA Card finished.

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