vlogin plugin and multilogin plugin

[Ralf Hildebrandt]

The vlogin plugin has a special option ($use_session_based = 1;) that
requires a patch to the SquirrelMail source code that can be found in the
multilogin plugin directory.

Unfortunately, that patch from even the latest multilogin plugin does NOT
apply to 1.4.12 in any way. The latest patch is for 1.4.9.

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[Ralf Hildebrandt]

* Ralf Hildebrandt <Ralf.Hildebrandt@...>:
> The vlogin plugin has a special option ($use_session_based = 1;) that
> requires a patch to the SquirrelMail source code that can be found in the
> multilogin plugin directory.
>
> Unfortunately, that patch from even the latest multilogin plugin does NOT
> apply to 1.4.12 in any way. The latest patch is for 1.4.9.

This results in a massive performance problem here.

The patch:

--- ../../include/validate.php.orig     2006-08-07 12:07:44.000000000 -0700
+++ ../../include/validate.php  2006-09-01 05:17:39.000000000 -0700
@@ -52,6 +52,9 @@
 
 sqsession_is_active();
   
+include_once(SM_PATH . 'plugins/multilogin/functions.php');
+multilogin_sqoverride_config_do(array('validate_top')); // dummy hook name
+
 require_once(SM_PATH . 'functions/i18n.php');
 require_once(SM_PATH . 'functions/auth.php');
 
Since include/validate.php looks like (sqsession_is_active doesn't
even exist!):

--- snip ---
/* SquirrelMail required files. */
require_once(SM_PATH . 'class/mime.class.php');
require_once(SM_PATH . 'functions/global.php');
require_once(SM_PATH . 'functions/i18n.php');
require_once(SM_PATH . 'functions/auth.php');

is_logged_in();

require_once(SM_PATH . 'include/load_prefs.php');
require_once(SM_PATH . 'functions/page_header.php');
require_once(SM_PATH . 'functions/prefs.php');

/* Set up the language (i18n.php was included by auth.php). */
global $username, $data_dir;
--- snap ---

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[Paul Lesniewski]

Hi Ralf,

On Dec 10, 2007 6:43 AM, Ralf Hildebrandt <Ralf.Hildebrandt@...> wrote:
> The vlogin plugin has a special option ($use_session_based = 1;) that
> requires a patch to the SquirrelMail source code that can be found in the
> multilogin plugin directory.
>
> Unfortunately, that patch from even the latest multilogin plugin does NOT
> apply to 1.4.12 in any way. The latest patch is for 1.4.9.

An updated patch was asked for and published on the plugins mailing
list several days ago.  I will release it when I can find the time.
Remember:

Posting guidelines: http://squirrelmail.org/postingguidelines

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[Paul Lesniewski]

On Dec 10, 2007 10:26 AM, Ralf Hildebrandt <Ralf.Hildebrandt@...> wrote:
> * Ralf Hildebrandt <Ralf.Hildebrandt@...>:
> > The vlogin plugin has a special option ($use_session_based = 1;) that
> > requires a patch to the SquirrelMail source code that can be found in the
> > multilogin plugin directory.
> >
> > Unfortunately, that patch from even the latest multilogin plugin does NOT
> > apply to 1.4.12 in any way. The latest patch is for 1.4.9.
>
> This results in a massive performance problem here.

Your code seems to be borked.  If you download a fresh 1.4.12 and
apply the patch found here:

http://article.gmane.org/gmane.mail.squirrelmail.plugins/13733

You should have the is_logged_in() after the inclusion of auth.php and
sqsession_is_active() should not occur in the file at all.  If you
still have problems after you confirm this, let us know.

> The patch:
>
> --- ../../include/validate.php.orig     2006-08-07 12:07:44.000000000 -0700
> +++ ../../include/validate.php  2006-09-01 05:17:39.000000000 -0700
> @@ -52,6 +52,9 @@
>
>  sqsession_is_active();
>
> +include_once(SM_PATH . 'plugins/multilogin/functions.php');
> +multilogin_sqoverride_config_do(array('validate_top')); // dummy hook name
> +
>  require_once(SM_PATH . 'functions/i18n.php');
>  require_once(SM_PATH . 'functions/auth.php');
>
> Since include/validate.php looks like (sqsession_is_active doesn't
> even exist!):
>
> --- snip ---
> /* SquirrelMail required files. */
> require_once(SM_PATH . 'class/mime.class.php');
> require_once(SM_PATH . 'functions/global.php');
> require_once(SM_PATH . 'functions/i18n.php');
> require_once(SM_PATH . 'functions/auth.php');
>
> is_logged_in();
>
> require_once(SM_PATH . 'include/load_prefs.php');
> require_once(SM_PATH . 'functions/page_header.php');
> require_once(SM_PATH . 'functions/prefs.php');
>
> /* Set up the language (i18n.php was included by auth.php). */
> global $username, $data_dir;
> --- snap ---
>
> --
> Ralf Hildebrandt (i.A. des IT-Zentrums)         Ralf.Hildebrandt@...
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[Ralf Hildebrandt]

* Paul Lesniewski <paul@...>:

> > This results in a massive performance problem here.
>
> Your code seems to be borked.  If you download a fresh 1.4.12 and
> apply the patch found here:
>
> http://article.gmane.org/gmane.mail.squirrelmail.plugins/13733

I didn't know about that patch. It's not in the multilogin plugin.
 
> You should have the is_logged_in() after the inclusion of auth.php and
> sqsession_is_active() should not occur in the file at all.

That's what I wrote. I posted the wrong patch, and even wrote
"sqsession_is_active doesn't even exist!"

> If you still have problems after you confirm this, let us know.

I'll try it.

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[Ralf Hildebrandt]

* Ralf Hildebrandt <Ralf.Hildebrandt@...>:

> That's what I wrote. I posted the wrong patch, and even wrote
> "sqsession_is_active doesn't even exist!"
>
> > If you still have problems after you confirm this, let us know.
>
> I'll try it.

So, I made the changes shown in
http://article.gmane.org/gmane.mail.squirrelmail.plugins/13733
but the performance problem remains. Once I swithc over from 1.4.10a
to 1.4.12, the load spikes.

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[Paul Lesniewski]

On Dec 11, 2007 12:50 AM, Ralf Hildebrandt <Ralf.Hildebrandt@...> wrote:

> * Ralf Hildebrandt <Ralf.Hildebrandt@...>:
>
> > That's what I wrote. I posted the wrong patch, and even wrote
> > "sqsession_is_active doesn't even exist!"
> >
> > > If you still have problems after you confirm this, let us know.
> >
> > I'll try it.
>
> So, I made the changes shown in
> http://article.gmane.org/gmane.mail.squirrelmail.plugins/13733
> but the performance problem remains. Once I swithc over from 1.4.10a
> to 1.4.12, the load spikes.

Do you know where?  Are you using any profiler?  Can you try it w/out
Multilogin/Vlogin (and all other plugins)?

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[Paul Lesniewski]

On Dec 11, 2007 12:50 AM, Ralf Hildebrandt <Ralf.Hildebrandt@...> wrote:

> * Ralf Hildebrandt <Ralf.Hildebrandt@...>:
>
> > That's what I wrote. I posted the wrong patch, and even wrote
> > "sqsession_is_active doesn't even exist!"
> >
> > > If you still have problems after you confirm this, let us know.
> >
> > I'll try it.
>
> So, I made the changes shown in
> http://article.gmane.org/gmane.mail.squirrelmail.plugins/13733
> but the performance problem remains. Once I swithc over from 1.4.10a
> to 1.4.12, the load spikes.

Do you know where?  Are you using any profiler?  Can you try it w/out
Multilogin/Vlogin (and all other plugins)?

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[Ralf Hildebrandt]

* Paul Lesniewski <paul@...>:

> > to 1.4.12, the load spikes.
>
> Do you know where?

No, don't know.

> Are you using any profiler?

Which ones are there? I'd be willing to try that.

> Can you try it w/out Multilogin/Vlogin (and all other plugins)?

The whole point of the setup IS the Multilogin/Vlogin plugin, since I
*MUST* branch to two servers. I also tested that setup with a seperate
URL -- it WORKS, but if it needs to handle the daily load, it just
fails utterly.

I could of course disable all other plugins to see if any of those is
causing the problems...

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[Paul Lesniewski]

On Dec 11, 2007 1:14 AM, Ralf Hildebrandt <Ralf.Hildebrandt@...> wrote:

> * Paul Lesniewski <paul@...>:
>
> > > to 1.4.12, the load spikes.
> >
> > Do you know where?
>
> No, don't know.
>
> > Are you using any profiler?
>
> Which ones are there? I'd be willing to try that.

I've been using http://xdebug.org but there are a few others quickly
found via a Google search.  I'd actually be curious if anyone uses
http://gubed.mccabe.nu/ although I'm not sure if that one has any
profiling capabilities.

> > Can you try it w/out Multilogin/Vlogin (and all other plugins)?
>
> The whole point of the setup IS the Multilogin/Vlogin plugin, since I
> *MUST* branch to two servers. I also tested that setup with a seperate
> URL -- it WORKS, but if it needs to handle the daily load, it just
> fails utterly.

Just for testing, I think you can set up a parallel installation that
points to just one of your IMAP servers and then you can log in with
the full username so that Vlogin and company are not needed.  It would
be helpful to know if that one creates the same load.

> I could of course disable all other plugins to see if any of those is
> causing the problems...

That would be a good starting point.

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[Ralf Hildebrandt]

* Paul Lesniewski <paul@...>:

> Just for testing, I think you can set up a parallel installation that
> points to just one of your IMAP servers and then you can log in with
> the full username so that Vlogin and company are not needed.  It would
> be helpful to know if that one creates the same load.

Did that just now: I disabled JUST the vlogin plugin and switched all users
over to that version -- no load spikes.

So it's definitely in the vlogin plugin.
Urgh.

How can I enable profiling JUST for the vlogin plugin using xdebug?
Global profiling kills my machine.

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[Paul Lesniewski]

Ralf,

> > Just for testing, I think you can set up a parallel installation that
> > points to just one of your IMAP servers and then you can log in with
> > the full username so that Vlogin and company are not needed.  It would
> > be helpful to know if that one creates the same load.
>
> Did that just now: I disabled JUST the vlogin plugin and switched all users
> over to that version -- no load spikes.

Uh oh.  Doesn't sound like the fix will be fun.  Although the code
change was in the SM core, which is odd/interesting.

> So it's definitely in the vlogin plugin.
> Urgh.
>
> How can I enable profiling JUST for the vlogin plugin using xdebug?
> Global profiling kills my machine.

You really want to profile one page request at a time, once with
vlogin enabled, and once with it turned off.  You can't just profile a
partial piece of the page request.  The timing information in the
profiles can then be compared.  Also, I do have some new development
code for vlogin, although I don't think it has any big changes that
will affect this problem.  But it would be good to have you using the
newest code.  I'll send offlist.

Thanks,

 Paul

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[Ralf Hildebrandt]

* Paul Lesniewski <paul@...>:

> > Did that just now: I disabled JUST the vlogin plugin and switched all users
> > over to that version -- no load spikes.
>
> Uh oh.  Doesn't sound like the fix will be fun.  Although the code
> change was in the SM core, which is odd/interesting.

Indeed not. I made some more tests: I updated to 1.4.13 and left all
plugins as-is: All is well.

I update the vlogin: Things go amiss.

So it's something in the vlogin plugin, but I have yet to see which
version is still "good" and which version makes it go "bad".

> You really want to profile one page request at a time, once with
> vlogin enabled, and once with it turned off.  You can't just profile a
> partial piece of the page request.  The timing information in the
> profiles can then be compared.  Also, I do have some new development
> code for vlogin, although I don't think it has any big changes that
> will affect this problem.  But it would be good to have you using the
> newest code.  I'll send offlist.

OK.

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[Paul Lesniewski]

On Dec 16, 2007 8:01 AM, Ralf Hildebrandt <Ralf.Hildebrandt@...> wrote:

> * Paul Lesniewski <paul@...>:
>
> > > Did that just now: I disabled JUST the vlogin plugin and switched all users
> > > over to that version -- no load spikes.
> >
> > Uh oh.  Doesn't sound like the fix will be fun.  Although the code
> > change was in the SM core, which is odd/interesting.
>
> Indeed not. I made some more tests: I updated to 1.4.13 and left all
> plugins as-is: All is well.
>
> I update the vlogin: Things go amiss.

Ah, well you didn't mention your vlogin version(s) and that you were
also upgrading it.  Please list all relevant version information.  If
you can test and/or profile amongst different versions, this is of
course very helpful.

> So it's something in the vlogin plugin, but I have yet to see which
> version is still "good" and which version makes it go "bad".
>
> > You really want to profile one page request at a time, once with
> > vlogin enabled, and once with it turned off.  You can't just profile a
> > partial piece of the page request.  The timing information in the
> > profiles can then be compared.  Also, I do have some new development
> > code for vlogin, although I don't think it has any big changes that
> > will affect this problem.  But it would be good to have you using the
> > newest code.  I'll send offlist.
>

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[Ralf Hildebrandt]

* Paul Lesniewski <paul@...>:

> > I update the vlogin: Things go amiss.
>
> Ah, well you didn't mention your vlogin version(s) and that you were
> also upgrading it.  Please list all relevant version information.  If
> you can test and/or profile amongst different versions, this is of
> course very helpful.

So. Working version:
Virtual Host Login (v3.8.0-1.2.7)

definitely not working: Version 3.9.2
But I'll have to try the other, older versions as well.

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[Ralf Hildebrandt]

* Ralf Hildebrandt <Ralf.Hildebrandt@...>:

> * Paul Lesniewski <paul@...>:
>
> > > I update the vlogin: Things go amiss.
> >
> > Ah, well you didn't mention your vlogin version(s) and that you were
> > also upgrading it.  Please list all relevant version information.  If
> > you can test and/or profile amongst different versions, this is of
> > course very helpful.
>
> So. Working version:
> Virtual Host Login (v3.8.0-1.2.7)
>
> definitely not working: Version 3.9.2
> But I'll have to try the other, older versions as well.

So, I found it:

vlogin-3.9.1-1.2.7.tar.gz works fine
vlogin-3.9.2-1.2.7.tar.gz introduces the problem

--
Ralf Hildebrandt (i.A. des IT-Zentrums) &nbs