A constructor function for queue-flow that sacrifices queue correctness for parallelism
npm install sloppy-queue-flow
0.1.10 requires Node version
0.8.17 and NPM version
1.2.0 to take advantage of the new
peerDependencies mechanism. This means that if you require a specific version of
queue-flow in your application,
sloppy-queue-flow will use that version rather than pulling in its own copy. It is otherwise identical to version
npm test to check your changes (using nodeunit) haven't broken existing functionality. Literate programming documentation can be found inside of the
/docs directory, generated by docco.
For details on how it all works in general, see the queue-flow library for detailed API documentation and usage examples.
sloppy-queue-flow is a replacement constructor function that eliminates guarantees on queue order to allow execution on each item in the queue to traverse through the flow as fast as possible. This is a trade-off that makes sense for things like the Express-like server example from the main queue-flow library, but would break the dependency resolution example. Essentially,
sloppy-queue-flow is only valid for cases where all operations are commutative, which is not everything, but does cover a surprising number of cases.
sloppy-queue-flow in Node.js, simply:
var q = require'queue-flow';var sloppy = require'sloppy-queue-flow';q'sloppyQueue' sloppy // Code here
Such as HTTP request-response pairs that will be served to totally different users and have no impact on one another? Then
sloppy-queue-flow will improve the performance of the system and push the bottlenecks out to your I/O.
4*3*2 == 2*3*4? Then
sloppy-queue-flow can be used, but you must be cautious. If at any time in the future you change it to something that can't be reordered, such as
4/3/2 != 2/3/4, then you need to drop usage of
queue-flow as a source code organizer for event/request handlers can use
queue-flow as a data processor should not use
sloppy-queue-flow, unless you're sure it won't screw things up and you're sure the queueing is the bottleneck (if each step along the flow has a predictable processing time,
sloppy-queue-flow will not provide any measureable advantage if the number of stages exceeds the number of processor cores).
Copyright (C) 2012-2013 by David Ellis
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