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Hi,
I am having a strange issue with a mod_perl handler which I've written
lately.
A little background. we are using a mod_perl script for our self-developed
MS .NET application.
The application connects to the frontend server, where the mod_perl
"proxy" is running. The script
does some kind of load_balancing and then proxies the request to the
backend and providest the
answer from the backend back to the application. This concept is working
fine, but the initial version
of the proxy script is poorly written. It first collects all data from the
client in memory (which might be
a pretty high amount of data (up to 100MB)), then send the stuff to the
backend and then provides
the answer. This causes bad memory consumption- especially if there are
more than 100 concurrent
users. Also the script is no real mod_perl script, but uses
ModPerl::Registry instead.
So I've re-written the whole script from scratch. I've written it as
"real" mod_perl handler module.
It's now working with chunks of data to be sent and received. Everything
seems to working fine-
except of one thing. The .NET app has the ability to upload a file to the
backend. With the original
script the upload usually has at least about 1-2MB/sec bandwidth. but with
the new script that
I've written, it only provides a throughput of about 300kb/sec. I did
couple of profiling already,
but wasn't able to find the cause of this.
So I am wondering if someone of the mod_perl community has some advices or
hints, how to resolve
this issue. Every help or thought-provoking impulse is highly appreciated.
Thanks
Winni
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<p class=3DMsoNormal>Hi,<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal><span lang=3DEN-US>I am having a strange issue with =
a mod_perl
handler which I’ve written lately.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>A little background… we =
are using a
mod_perl script for our self-developed MS .NET =
application.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>The application connects to the =
frontend
server, where the mod_perl “proxy” is running. The =
script<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>does some kind of load_balancing =
and then proxies
the request to the backend and providest the<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>answer from the backend back to =
the
application. This concept is working fine, but the initial =
version<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>of the proxy script is poorly =
written. It
first collects all data from the client in memory (which might =
be<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>a pretty high amount of data (up =
to
100MB)), then send the stuff to the backend and then provides =
<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>the answer… This causes =
bad memory
consumption- especially if there are more than 100 =
concurrent<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>users. Also the script is no =
real mod_perl
script, but uses ModPerl::Registry instead.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>So I’ve re-written the =
whole script
from scratch. I’ve written it as “real” mod_perl =
handler
module.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>It’s now working with =
chunks of data
to be sent and received. Everything seems to working fine- =
<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>except of one thing… The =
..NET app has
the ability to upload a file to the backend. With the original =
<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>script the upload usually has at =
least
about 1-2MB/sec bandwidth… but with the new script that =
<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>I’ve written, it only =
provides a
throughput of about 300kb/sec. I did couple of profiling =
already,<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>but wasn’t able to find =
the cause of
this. <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>So I am wondering if someone of =
the
mod_perl community has some advices or hints, how to =
resolve<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>this issue. Every help or =
thought-provoking
impulse is highly appreciated.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><br>
Thanks<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>Winni<o:p></o:p></span></p>
</div>
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