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From Martin Gainty <mgai...@hotmail.com>
Subject RE: useSendFile=true skips compression
Date Mon, 06 Oct 2008 01:09:01 GMT

if you're implementing with xml you *may* want to consider result-set data format which utilises
less bandwidth such as json..start here
http://gwt-rest.googlecode.com/svn/trunk/README

Martin 
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> Date: Mon, 6 Oct 2008 09:20:21 +0900
> From: ssenecal.work@gmail.com
> To: users@tomcat.apache.org
> Subject: Re: useSendFile=true skips compression
> 
> Thanks for the explaination.   So either I take the performance hit if I
> have high volumes, or the clients take a performance hit if I dont use
> compression.  Is there some way I could get the best of both worlds?  Maybe
> compress the files on the filesystem, then use a filter to programatically
> change the content type of those specific files to gzip?  I suppose that
> would save some CPU as well, since the files wouldnt need to be recompressed
> with every request.  Of course that also means that browsers without gzip
> abilities are SOL, but then again, this is a GWT app, so I am assuming a new
> browser (sorry lynx, no support).
> 
> On Sat, Oct 4, 2008 at 11:43 AM, Bill Barker <wbarker@wilshire.com> wrote:
> 
> >
> > "Shaun Senecal" <ssenecal.work@gmail.com> wrote in message
> > news:15060d5e0810022236v25a92bc1if2f80aac89e0d8f2@mail.gmail.com...
> > > Could someone explain to me why the NIO Connector will ignore the
> > > compression settings for large files if useSendFile is enabled (it is by
> > > default)?  It seems to me that if compression is enabled you would
> > > specifically want to use it when sendFile is enabled, but that might just
> > > be
> > > because I don't really understand what sendFile means/does :)
> > >
> >
> > In "normal" mode, Tomcat reads the file into its own memory buffer,
> > optionally compresses it, and then writes it out again to the socket.  In
> > "sendFile" mode, Tomcat tells the O/S to transfer the contents of the file
> > directly to the socket (bypassing reading it in to Tomcat memory).  On a
> > modern O/S, this allows the O/S to transfer data using kernel memory only,
> > instead of copying the kernel memory to program memory first (which has a
> > significant cost on high-volume servers).
> >
> > > It looks like my solution is to simply disable this option, but I was
> > > curious about why this is the case.  I am trying to deploy a large GWT
> > > app,
> > > and I want to ensure that my massive JavaScript files get compressed
> > > before
> > > being sent to the client.
> > >
> >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
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> >
> >

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