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• Socket Buffer 大小确定 Buffer 大小设置, the goal is to strike a balance between communication needs and other processing. Larger socket buffers allow Geode members to distribute data and events more quickly, but also reduce the memory available for other tasks. In some cases, particularly when storing very large data objects, finding the right socket buffer size can become critical to system performance.

Ideally, socket buffers should be large enough for the distribution of any single data object. This will avoid message fragmentation, which lowers performance. The socket buffers should be at least as large as the largest stored objects with their keys plus some overhead for message headers - 100 bytes should be sufficient.

If possible, the TCP/IP socket buffer settings should match across the Geode installation. At a minimum, follow the guidelines listed below.

• 目标是在通信和其他处理之间做出平衡. 更大的 Socket Buffers  允许 Geode 成员来快速分发数据和事件, 但是也减少了内存可用率. 在一些情况下, 特别是当保存非常大的数据对象时, 找到正确的Socket Buffer 大小对于系统性能是很关键的.

理想情况下, 对于任何的数据对象分发来说, Socket Buffers 应该足够大. 这将要避免消息分片, 性能会更低. Socket Buffers  至少应该和最大的数据对象一样大, 带着 keys值和一些消息头开销 - 100 bytes 应该足够大了.

如果可能的话, TCP/IP Socket Buffer  设置应该匹配 Geode 的设置. 参见如下指导.

++ P2P. 在gemfire.properties属性中, Socket-Buffer-size  设置应该在分布式系统中是相同的.

++ Client/server. 客户端的池 Socket-Buffer size 应该匹配服务器的池所使用的设置.

++ Server. 在服务器的cache.xml 文件中, 服务器的 Socket-Buffer size  应该匹配客户端所定义的值.

++ Peer-to-peer. The socket-buffer-size setting in gemfire.properties should be the same throughout the distributed system. ++ Client/server. The client’s pool socket-buffer size-should match the setting for the servers that the pool uses. ++ Server. The server socket-buffer size in the server’s cache configuration (e.g. cache.xml file) should match the values defined for the server’s clients. ++ Multisite (WAN). If the link between sites isn’t optimized for throughput, it can cause messages to back up in the queues. If a receiving queue buffer overflows, it will get out of sync with the sender and the receiver won’t know it. A gateway sender's 如果数据中心站点之间链路没有被优化, 它可能导致消息在队列中备份. 如果一个接收队列 Buffer 溢出, 它将发送者不同步, 而接受者不知道这个情况. 一个网关发送者的 socket-buffer-size should match the gateway receiver’s 应该匹配网关接受者的 socket-buffer-size for all receivers that the sender connects to.

Note注意: OS TCP buffer size limits must be large enough to accommodate Geode socket buffer settings. If not, the Geode value will be set to the OS limit – not the requested value限制必须足够大来调节  Geode Socket Buffer  的设置. 如果不是, Geode 的值将设置到 OS 限制 – 而不是请求的值.

• TCP/IP Keep Alive

Geode supports TCP KeepAlive to prevent socket connections from being timed out.

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