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From tibor17 <tibo...@lycos.com>
Subject Re: Preview release: Plexus Archiver multithreaded Zip edition
Date Mon, 12 Jan 2015 17:33:35 GMT
yes it goes to OS with one exception, I was trying to explain :)
The exception is that file system is mapped with memory, and so the writes
go to the memory fast, but they go to the file system as well however
slowly. The trick is that the data goes to both memory and IO, they can be
read immediately, and meanwhile you can lazily compute new data for new
writing. This means the operations which compute data are blocked on the
speed level of memory acccess and not the physical speed of file system.
Therefore if you do it with chunks data, then your algorithm does not slow
down. You don't need two Threads (one for computing and another for writing
to IO), therefore single thread and ByteBuffer from NIO package does not
need to be thread-safe.
This is useful only if data computing really takes some time, and then the
benefit is that all r/w are on memory speed. Then your application should
have DMA access to that memory this way.



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BR, tibor17
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