Thread pool configuration

[Alan Bateman]

Avinash Lakshman wrote:
> Do the FileChannel's transferTo() and transferFrom() methods use the 
> AIO framework or are they synchronous in nature? I remember reading 
> somewhere that the Linux sendfile() implementation relies on O_DIRECT 
> to not disturb the page cache. Any truth to this?
FileChannel defines synchronous operations. The facility that the 
transferTo/transferFrom methods use depend on the target (or source) 
channel. For example, if you transferTo a socket channel then it will 
use sendfile; if you transferTo another file channel then it uses memory 
mapped I/O. We don't have FileChannel integrated with 
AsynchronousSocketChannel yet but this is something I hope to address. 
Direct I/O bypasses the file system cache so great for databases and 
other very advanced cases that do their own caching. This is not 
something that the average application will use (requires careful 
alignment of buffers and file offsets for example).

-Alan.