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From "Shabu Khan" <hish...@gmail.com>
Subject Re: CGI/HTML
Date Fri, 16 May 2008 18:24:54 GMT
Thanks Chris.
I don't see any 'buffer setting tweaks' in the code, from the command line
there is no delay it works just like a regular perl/shell script.

This is a code written by someone back in 2000, I ported it to Perl 5.8.5
from Perl 5.005 and to the new Kernel (Linux 2.6), the output shows-up on
the browser only after the code is executed completely (basically after the
script run is complete).

Earlier with Apache, I was able to see the output as it ran, just like from
the command line on the browser ...

On Fri, May 16, 2008 at 10:43 AM, Christopher Schultz <
chris@christopherschultz.net> wrote:

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> Shabu,
>
> Shabu Khan wrote:
> | For some reason, the cgi perl script that I run via IE/Firefox does not
> | render the output immediately,  but waits until it has big chunk of the
> | HTML.   Does this have anything to do with the tomcat/cgi setup or
> header or
> | something, or perl mod defaults?
>
> This probably has to do with the size of the output buffer in either
> Perl or whatever mechanism is being used to shuttle information from
> your CGI script through Tomcat and any other layers you may have in
> between.
>
> I would check the CGI runner you are using to see if there is a buffer
> size tweaking setting.
>
> I didn't see anything like that in
> http://tomcat.apache.org/tomcat-6.0-doc/cgi-howto.html so you might want
> to check the code.
>
> CGIServlet appears to have a small (2048 byte) buffer for output, which
> shouldn't be a problem. It looks like the loop that monitors the
> (external) CGI process at 500ms intervals to check up on the process
> while no output is being produced. While output is being produced, it
> should be constantly moving data from the CGI's stdout to the
> ServletOutputStream (which is unbuffered). The /input/ from the CGI is
> buffered up through the end of the headers, and then the writer is
> ignored and the input stream is unbuffered (not really sure how this
> works properly...). It's possible that you are hitting odd buffer
> boundaries where a buffer flush requires several of these half-second
> pauses before enough data is available.
>
> Have you timed your perl script independently to see if there actually
> is a delay in generating the content, rather than simply moving if from
> the CGI to through Tomcat?
>
> - -chris
>
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-- 
Shabu Khan | Mentis Systems Inc | W: (425) 649-1130 | C: (425) 301-1948 | F:
(425) 256-2819
http://www.linkedin.com/in/shabukhan

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