I made a simple test: I wrote a few lines of Java using File channel and
transferTo(...) method to read files from my DVD and write to the hard drive.
With this simple test, the transferTo(...) method gets about 4 MB /S transfer
rate to disk.
Then, I put some timing code into the LengthDelimitedEncoder.transfer(...)
method, and ran my application, which copies files from DVD
to a socket. And the transferTo(...) from file to socket was getting about 0.7
MB /s . This is a 6 X degradation in performance.
And, if you recall, if the files are already in the OS file cache, I get about
100 MB/S, so the socket is not slowing me down.
I have done a little more testing: transferTo from DVD to local socket gets
3-4 MB/S transfer rate.
I tried using a thread pool, and performance degrades (not surprisingly) as
thread count rises from 1.
Since DVD seeks are very slow, multiple threads trying to read at the same time
will kill performance.
But, I am not sure this is the issue here, because I have set
connManager.setMaxTotal(1);
connManager.setDefaultMaxPerRoute(1);
So, there should only be one thread doing the transfer (is this true?)
Anyways, I guess I will switch back to the synchronous client for my
application.
Aaron
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