node.js buffering
This is showing node.js socket writes, decomposed by number of bytes buffered within node. (Node will buffer bytes when it cannot write to the stream without blocking.) The program here is the socket.io example program (a beautifully tight chat program) trying to write a large (greater than three megabyte) buffer to three clients (highlighted here). This shows that (as expected) the clients are consuming data (thereby allowing node to write its buffered data to the kernel) faster than it is being generated. The data was generated by instrumenting node.js with DTrace (using USDT probes that record bufferSize) and then visualized using a prototype of Joyent's forthcoming cloud analytics, more details on which can be found here: http://dtrace.org/blogs/brendan/2011/01/24/cloud-analytics-first-video/
02 February 2011
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