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Rethink the sync

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We know the traditional I/O models: sync and async, however, some researchers from Michigan University figures out a new model, they call it "external sync"

The difference between e-sync and sync is shown below:


fig1
This figure shows the behavior of a sample application that makes two file system modifications, then displays output to an external device. The diagram on the left shows how the application executes when its file I/O is synchronous; the diagram on the right shows how it executes when its file I/O is externally synchronous.
External synchrony preserves the simplicity and reliability of a synchronous I/O interface, yet performs approximately as well as an asynchronous I/O interface.
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2 楼 willpower 2007-03-23  
The idea behind is e-sync IO does not block the application, so background operations can be committed in batch. So, the general performance is improved. This is also different from traditional async, for which user get responce even the background operations have not finished. However, for e-sync, user would not get responce until the operations have been flush.
1 楼 specsence 2007-03-22  
I am not very clear about the two diagram. is it smiler  as AJAX?intr
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