Optimizations for readers #192
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acogoluegnes
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This saves a system call by sending the frame header and the chunk header at the same time. References rabbitmq/osiris#192
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This saves a system call by sending the frame header and the chunk header at the same time. References rabbitmq/osiris#192
The callback is used in RabbitMQ to send the frame header. This commit changes the callback to expect a binary result and to send it along the chunk header. This saves a system call and improves performance with small chunks.
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Reading a chunk header then using the sendfile syscall to send the chunk data is not optimal for small chunks, as it amounts to 2 system calls for a small amount of bytes. This commit uses the size of the last chunk to try to read the whole chunk when the library reads the chunk header. If the last chunk data size was under 4096 bytes, the library does not only read the chunk header, but reads ahead to try to read the whole and thus to save the sendfile call later. This optimization should improve the read throughput for streams with small chunks, e.g. streams with 1-message chunks.
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acogoluegnes
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This saves a system call by sending the frame header and the chunk header at the same time. References rabbitmq/osiris#192
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A couple of optimizations when sending chunks to readers: