Performance of BufferedOutputStream.write() 2005-01-07 - By Jean-Christian Imbeault
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Frans Verhoef wrote:
>
> I did a little test myself, transferring a file (about 300kb) from one
harddisk to another using both methods. Method1 first loading the whole file,
before streaming it to the new location, and method2 streams to the new
location while streaming in from the file.
>
> Method2 finishes the transfer consistently in 12-14 micro seconds. In about
half the times method 1 also finishes in 12-14 micro seconds. However, the
other times it can take as long as 90 microseconds.
>
> Probably the reason behind it is that due to the big amounts of data you keep
on loading into the virtual machine, the garbage collector needs more time to
clear the heap.
>
> Maybe you could try to make a little test servlet to test the two different
methods in a servlet environment.
Thanks for the test! That was very nice of you.
I was just trying to implement a similar test when I talked to the
original architect and got the following response from him.
The file cannot be read in the servlet that streams to the client. That
servlet is part of the presentation layer, the servlet that reads the
file is part of the business layer. The two layers must be kept separate.
Furthermore if we ever use the application in a distributed fashion, it
is possible that the presentation layer will not have access to the file
itself ...
I kind of understand the architecture reasons behind the decision ...
but boy does it ever make for a performance hit ...
Jc
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