MESSAGE PASSING WITH A LIMITED NUMBER OF DMA BYTE COUNTERS
    11.
    发明申请
    MESSAGE PASSING WITH A LIMITED NUMBER OF DMA BYTE COUNTERS 失效
    消息传递与有限数量的DMA字节计数器

    公开(公告)号:US20090007141A1

    公开(公告)日:2009-01-01

    申请号:US11768813

    申请日:2007-06-26

    IPC分类号: G06F9/44

    CPC分类号: G06F15/17356 G06F9/546

    摘要: A method for passing messages in a parallel computer system constructed as a plurality of compute nodes interconnected as a network where each compute node includes a DMA engine but includes only a limited number of byte counters for tracking a number of bytes that are sent or received by the DMA engine, where the byte counters may be used in shared counter or exclusive counter modes of operation. The method includes using rendezvous protocol, a source compute node deterministically sending a request to send (RTS) message with a single RTS descriptor using an exclusive injection counter to track both the RTS message and message data to be sent in association with the RTS message, to a destination compute node such that the RTS descriptor indicates to the destination compute node that the message data will be adaptively routed to the destination node. Using one DMA FIFO at the source compute node, the RTS descriptors are maintained for rendezvous messages destined for the destination compute node to ensure proper message data ordering thereat. Using a reception counter at a DMA engine, the destination compute node tracks reception of the RTS and associated message data and sends a clear to send (CTS) message to the source node in a rendezvous protocol form of a remote get to accept the RTS message and message data and processing the remote get (CTS) by the source compute node DMA engine to provide the message data to be sent.

    摘要翻译: 一种在并行计算机系统中传送消息的方法,该并行计算机系统被构造为作为网络互连的多个计算节点,其中每个计算节点包括DMA引擎,但是仅包括有限数量的字节计数器,用于跟踪由 DMA引擎,其中可以在共享计数器或专用计数器操作模式中使用字节计数器。 该方法包括使用会合协议,源计算节点使用专用注入计数器确定性地发送具有单个RTS描述符的请求(RTS)消息以跟踪要与RTS消息相关联地发送的RTS消息和消息数据, 到目的地计算节点,使得RTS描述符向目标计算节点指示消息数据将自适应地路由到目的地节点。 在源计算节点使用一个DMA FIFO,将为发往目的地计算节点的会合消息保留RTS描述符,以确保正确的消息数据顺序。 在DMA引擎上使用接收计数器,目的地计算节点跟踪RTS和相关联的消息数据的接收,并以远程获取的会合协议形式向源节点发送明确发送(CTS)消息以接受RTS消息 和消息数据,并由源计算节点DMA引擎处理远程获取(CTS)以提供要发送的消息数据。