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Posted to modperl@perl.apache.org by "Carwheel, Dan" <da...@isinet.com> on 2002/07/16 16:47:28 UTC
Purify, Perl and mod_perl
I've looked at Rational's Purify:
http://www.rational.com/products/purify_unix/index.jsp,
and although their web page says only works for C, C++, Java and a few
others, I've seen this page:
http://www.perlpod.com/stable/perlhack.html
on getting Perl work with with Purify.
My question is this...can I run my application using this purified perl
under mod_perl to track down potential memory leaks and other problems? Are
there any issues with running Perl for testing with Purify on a mod_perl
enabled webserver?
Thanks for the advice.
--Dan
Re: Purify, Perl and mod_perl
Posted by Stas Bekman <st...@stason.org>.
Perrin Harkins wrote:
[...]
>> My question is this...can I run my application using this purified perl
>> under mod_perl to track down potential memory leaks and other problems?
>
>
> You probably don't have any memory leaks. Most things that people refer
> to as leaks are just normal growth. A leak is when an area of memory
> gets "lost" because the program that allocated it forgets to free it.
or cannot free it because of the closure or a circular reference, which
seems to be the case with the bug in Apache::Request reported by Dave
Rolsky.
[...]
> A number of the most common sources of memory growth are explained in
> the guide:
> http://perl.apache.org/docs/1.0/guide/performance.html#Improving_Performance_by_Prevention
Plus Apache::Leak, whose reports should be carefully analyzed because
not everything that it reports as a leak is actually a leak:
http://perl.apache.org/docs/1.0/guide/debug.html#How_can_I_find_out_if_a_mod_perl_code_has_a_memory_leak
__________________________________________________________________
Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide ---> http://perl.apache.org
mailto:stas@stason.org http://use.perl.org http://apacheweek.com
http://modperlbook.org http://apache.org http://ticketmaster.com
Re: New mod_perl site and oddness with IE
Posted by Steve Piner <st...@marketview.co.nz>.
Stas Bekman wrote:
>
> Jim Helm wrote:
> > Has anyone else had problems with this particular page under IE
> > (6.0.2600 under XP) being extremly slow to update when paging up/down?
> > It works fine under Mozilla, and it's not a memory or cpu issue (checked
> > with task manager already). And when I say slow, I mean a simple down
> > cursor causes the visible portion of the page to get painted in 4
> > noticble steps/chunks.
> >
> > An older version I tracked down with Google
> > (http://www.apache.jp/perl/guide/performance.html) which is also 300K+
> > doesn't have the same problem - just to show that it's not purely the
> > raw size of the page that is the problem.
> >
> > Just a little feedback for the new site (which is great, btw). If it's
> > just me with the problem, I'll go find a rock to hide under. :)
>
> Is the size of the page causes the trouble? I don't have IE to try so
> hopefully someone will help us out here. What happens if you shorten the
> content of the page?
>
> My guess is that IE simply cannot cope with a long page and the current
> complex stylesheet (because as say it works fine with the same page and
> a simpler stylesheet, which includes no layout instructions).
> Suggestions on how to fix that are welcome.
IE 5.50.4807.2300 (SP2) on Win98SE
I had different problems - the first time I went to the page, IE crashed
my machine, so I had to reboot.
After I'd rebooted I went back to the page. I got the extremely slow
scrolling, but, more significantly, I got the second half of the page
overlaid on top of the first half.
I grabbed a copy of the page with Opera's 'save with images' option
(strangely enough doing it with IE, and viewing the result didn't get
the same display) and verified that the bug occurred with my local copy.
I then had a bit of a fiddle with the stylesheet, and discovered that
taking out the 'position: relative's seemed to stop the overlay,
improving IEs performance markedly without affecting the page layout in
any of the browsers I have installed (Netscape 4.79, Mozilla 2002053012,
Opera 6.04)
(There was no reason *why* taking out the 'position: relative's should
work - it just struck me as the first thing that wasn't necessary in the
style sheet. Possibly irritating an IE bug just a little too much)
Hope this helps,
Steve
--
Steve Piner
Web Applications Developer
Marketview Limited
http://www.marketview.co.nz
Re: New mod_perl site and oddness with IE
Posted by Stas Bekman <st...@stason.org>.
Jim Helm wrote:
> Has anyone else had problems with this particular page under IE
> (6.0.2600 under XP) being extremly slow to update when paging up/down?
> It works fine under Mozilla, and it's not a memory or cpu issue (checked
> with task manager already). And when I say slow, I mean a simple down
> cursor causes the visible portion of the page to get painted in 4
> noticble steps/chunks.
>
> An older version I tracked down with Google
> (http://www.apache.jp/perl/guide/performance.html) which is also 300K+
> doesn't have the same problem - just to show that it's not purely the
> raw size of the page that is the problem.
>
> Just a little feedback for the new site (which is great, btw). If it's
> just me with the problem, I'll go find a rock to hide under. :)
Is the size of the page causes the trouble? I don't have IE to try so
hopefully someone will help us out here. What happens if you shorten the
content of the page?
My guess is that IE simply cannot cope with a long page and the current
complex stylesheet (because as say it works fine with the same page and
a simpler stylesheet, which includes no layout instructions).
Suggestions on how to fix that are welcome.
__________________________________________________________________
Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide ---> http://perl.apache.org
mailto:stas@stason.org http://use.perl.org http://apacheweek.com
http://modperlbook.org http://apache.org http://ticketmaster.com
Re: New mod_perl site and oddness with IE
Posted by Issac Goldstand <ma...@beamartyr.net>.
No problem in MSIE 6 - XP
Issac
----- Original Message -----
From: "allan juul" <la...@inet.uni2.dk>
To: "Jim Helm" <jj...@att.net>
Cc: "'Perrin Harkins'" <pe...@elem.com>; <mo...@perl.apache.org>
Sent: Wednesday, July 17, 2002 10:46 AM
Subject: Re: New mod_perl site and oddness with IE
> Quoting Jim Helm <jj...@att.net>:
>
> > Has anyone else had problems with this particular page under IE
> > (6.0.2600 under XP) being extremly slow to update when paging up/down?
> > It works fine under Mozilla, and it's not a memory or cpu issue (checked
> > with task manager already). And when I say slow, I mean a simple down
> > cursor causes the visible portion of the page to get painted in 4
> > noticble steps/chunks.
> > --Jim
>
>
> please check if the problem exists on this url:
>
>
http://www.bullitt.suite.dk/clean3/dst_html/docs/1.0/guide/performance.html
>
> if you have other browser software, please check and see if anything else
is
> broken there as well.
>
> thanks a lot!
>
> /allan
>
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Re: New mod_perl site and oddness with IE
Posted by Steve Piner <st...@marketview.co.nz>.
allan juul wrote:
>
> Quoting Jim Helm <jj...@att.net>:
>
> > Has anyone else had problems with this particular page under IE
> > (6.0.2600 under XP) being extremly slow to update when paging up/down?
> > It works fine under Mozilla, and it's not a memory or cpu issue (checked
> > with task manager already). And when I say slow, I mean a simple down
> > cursor causes the visible portion of the page to get painted in 4
> > noticble steps/chunks.
> > --Jim
>
> please check if the problem exists on this url:
>
> http://www.bullitt.suite.dk/clean3/dst_html/docs/1.0/guide/performance.html
>
> if you have other browser software, please check and see if anything else is
> broken there as well.
>
> thanks a lot!
>
> /allan
Looks good to me with on Win98SE
* IE 5.50.4807.2300 (SP2)
* Netscape 4.79
* Mozilla 2002053012
* Opera 6.04
--
Steve Piner
Web Applications Developer
Marketview Limited
http://www.marketview.co.nz
Re: New mod_perl site and oddness with IE
Posted by Stas Bekman <st...@stason.org>.
[Let's move this thread to the docs-dev list, otherwise we make an OT
noise at the modperl list, so, please, when replying to this email,
remove the modperl address from it. thanks!]
>>Has anyone else had problems with this particular page under IE
>>(6.0.2600 under XP) being extremly slow to update when paging up/down?
>>It works fine under Mozilla, and it's not a memory or cpu issue (checked
>>with task manager already). And when I say slow, I mean a simple down
>>cursor causes the visible portion of the page to get painted in 4
>>noticble steps/chunks.
>>--Jim
>
>
>
> please check if the problem exists on this url:
>
> http://www.bullitt.suite.dk/clean3/dst_html/docs/1.0/guide/performance.html
>
> if you have other browser software, please check and see if anything else is
> broken there as well.
Allan, You are trying to solve it by applying HTML::Clean, which reduces
the size of the page, right? But even if it does solve the problem for
this particular page, what happens if the page grows, or there is some
other page which is bigger, and no cleanup will make it small enough to
make IE happy.
__________________________________________________________________
Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide ---> http://perl.apache.org
mailto:stas@stason.org http://use.perl.org http://apacheweek.com
http://modperlbook.org http://apache.org http://ticketmaster.com
Re: New mod_perl site and oddness with IE
Posted by Stas Bekman <st...@stason.org>.
[Let's move this thread to the docs-dev list, otherwise we make an OT
noise at the modperl list, so, please, when replying to this email,
remove the modperl address from it. thanks!]
>>Has anyone else had problems with this particular page under IE
>>(6.0.2600 under XP) being extremly slow to update when paging up/down?
>>It works fine under Mozilla, and it's not a memory or cpu issue (checked
>>with task manager already). And when I say slow, I mean a simple down
>>cursor causes the visible portion of the page to get painted in 4
>>noticble steps/chunks.
>>--Jim
>
>
>
> please check if the problem exists on this url:
>
> http://www.bullitt.suite.dk/clean3/dst_html/docs/1.0/guide/performance.html
>
> if you have other browser software, please check and see if anything else is
> broken there as well.
Allan, You are trying to solve it by applying HTML::Clean, which reduces
the size of the page, right? But even if it does solve the problem for
this particular page, what happens if the page grows, or there is some
other page which is bigger, and no cleanup will make it small enough to
make IE happy.
__________________________________________________________________
Stas Bekman JAm_pH ------> Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide ---> http://perl.apache.org
mailto:stas@stason.org http://use.perl.org http://apacheweek.com
http://modperlbook.org http://apache.org http://ticketmaster.com
---------------------------------------------------------------------
To unsubscribe, e-mail: docs-dev-unsubscribe@perl.apache.org
For additional commands, e-mail: docs-dev-help@perl.apache.org
Re: New mod_perl site and oddness with IE
Posted by allan juul <la...@inet.uni2.dk>.
Quoting Jim Helm <jj...@att.net>:
> Has anyone else had problems with this particular page under IE
> (6.0.2600 under XP) being extremly slow to update when paging up/down?
> It works fine under Mozilla, and it's not a memory or cpu issue (checked
> with task manager already). And when I say slow, I mean a simple down
> cursor causes the visible portion of the page to get painted in 4
> noticble steps/chunks.
> --Jim
please check if the problem exists on this url:
http://www.bullitt.suite.dk/clean3/dst_html/docs/1.0/guide/performance.html
if you have other browser software, please check and see if anything else is
broken there as well.
thanks a lot!
/allan
RE: New mod_perl site and oddness with IE
Posted by Randy Harmon <rj...@fortheweb.com>.
IE 5.5 on win2k as well.
> -----Original Message-----
> From: Issac Goldstand [mailto:margol@beamartyr.net]
> Not just you. I have the same problem under MSIE.
> > Has anyone else had problems with this particular page under IE
> > (6.0.2600 under XP) being extremly slow to update when paging up/down?
http://perl.apache.org/docs/1.0/guide/performance.html#Improving_Perform
Re: New mod_perl site and oddness with IE
Posted by Issac Goldstand <ma...@beamartyr.net>.
Not just you. I have the same problem under MSIE.
Issac
----- Original Message -----
From: "Jim Helm" <jj...@att.net>
To: "'Perrin Harkins'" <pe...@elem.com>
Cc: <mo...@perl.apache.org>
Sent: Wednesday, July 17, 2002 8:23 AM
Subject: New mod_perl site and oddness with IE
> Has anyone else had problems with this particular page under IE
> (6.0.2600 under XP) being extremly slow to update when paging up/down?
> It works fine under Mozilla, and it's not a memory or cpu issue (checked
> with task manager already). And when I say slow, I mean a simple down
> cursor causes the visible portion of the page to get painted in 4
> noticble steps/chunks.
>
> An older version I tracked down with Google
> (http://www.apache.jp/perl/guide/performance.html) which is also 300K+
> doesn't have the same problem - just to show that it's not purely the
> raw size of the page that is the problem.
>
> Just a little feedback for the new site (which is great, btw). If it's
> just me with the problem, I'll go find a rock to hide under. :)
>
> --Jim
>
> > A number of the most common sources of memory growth are explained in
> > the guide:
> >
> http://perl.apache.org/docs/1.0/guide/performance.html#Improving_Perform
> ance_by_Prevention
> >
> > - Perrin
>
>
New mod_perl site and oddness with IE
Posted by Jim Helm <jj...@att.net>.
Has anyone else had problems with this particular page under IE
(6.0.2600 under XP) being extremly slow to update when paging up/down?
It works fine under Mozilla, and it's not a memory or cpu issue (checked
with task manager already). And when I say slow, I mean a simple down
cursor causes the visible portion of the page to get painted in 4
noticble steps/chunks.
An older version I tracked down with Google
(http://www.apache.jp/perl/guide/performance.html) which is also 300K+
doesn't have the same problem - just to show that it's not purely the
raw size of the page that is the problem.
Just a little feedback for the new site (which is great, btw). If it's
just me with the problem, I'll go find a rock to hide under. :)
--Jim
> A number of the most common sources of memory growth are explained in
> the guide:
>
http://perl.apache.org/docs/1.0/guide/performance.html#Improving_Perform
ance_by_Prevention
>
> - Perrin
Re: Purify, Perl and mod_perl
Posted by Perrin Harkins <pe...@elem.com>.
Carwheel, Dan wrote:
> although their web page says only works for C, C++, Java and a few
> others, I've seen this page:
>
> http://www.perlpod.com/stable/perlhack.html
>
> on getting Perl work with with Purify.
That page is about getting Perl's C executable to work with Purify, not
using Purify to check your perl code.
> My question is this...can I run my application using this purified perl
> under mod_perl to track down potential memory leaks and other problems?
You probably don't have any memory leaks. Most things that people refer
to as leaks are just normal growth. A leak is when an area of memory
gets "lost" because the program that allocated it forgets to free it.
Growth is when your program uses variables in such a way that it needs
more memory over time. The latter is pretty common. Doing things like
eval'ing code, reading variable length data into strings, and keeping
other data structures that are affected by changes in user input or data
over time will often lead to this.
If you have out-of-control memory growth, you should try finding it the
old-fashioned way: take things out until it stops. Then, if you find a
little section that causes growth and you can't understand why, post it
here and someone may be able to explain it.
A number of the most common sources of memory growth are explained in
the guide:
http://perl.apache.org/docs/1.0/guide/performance.html#Improving_Performance_by_Prevention
- Perrin