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Posted to users@httpd.apache.org by "michael watson (IAH-C)" <mi...@bbsrc.ac.uk> on 2008/06/16 10:42:27 UTC
[users@httpd] Submitting jobs remotely over CGI, closing file handles etc
Dear All
I solved this problem some years ago by writing to this list and
carrying out the suggestions. Oddly, I now have it again.
I am running two servers - an old one, running SuSe 8.2 and apache
1.3.28, and a relatively new one running Red Hat EL 4 and Apache 2.2.4.
Here's the thing - the same script WORKS on the old server, and not on
the new, and I don't know why.
The problem is an age old one - I have jobs that take hours, I want
users to submit these jobs over CGI, I want the cgi script to submit a
job "in the background", tell the user they'll be e-mailed the results,
and then exit after submitting the job.
This happens on my old server; it doesn't on my new one. Same script,
same data, same everything apart from the OS and apache version.
The solution I got many years ago was to make sure all my file handles
are closed - they are.
CGI.pm version on old server is: 2.8.1
CGI.pm version on new server is: 3.2.9
Mail::Sender.pm version on old server is 0.8.10
Mail::Sender.pm version on new server is 0.8.13
Perl version on old is 5.8.0
Perl version on new is 5.8.5
Any help would be appreciated!
Thanks
Michael
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Re: [users@httpd] Submitting jobs remotely over CGI, closing file
handles etc
Posted by André Warnier <aw...@ice-sa.com>.
If you type fast, lsof ?
michael watson (IAH-C) wrote:
> OK, so no answers from this then... Instead, can anyone tell me how I
> can monitor whether (and which) file handles are open whilst the CGI
> script is running?
>
> -----Original Message-----
> From: michael watson (IAH-C) [mailto:michael.watson@bbsrc.ac.uk]
> Sent: 16 June 2008 09:42
> To: users@httpd.apache.org
> Subject: [users@httpd] Submitting jobs remotely over CGI, closing file
> handles etc
>
> Dear All
>
> I solved this problem some years ago by writing to this list and
> carrying out the suggestions. Oddly, I now have it again.
>
> I am running two servers - an old one, running SuSe 8.2 and apache
> 1.3.28, and a relatively new one running Red Hat EL 4 and Apache 2.2.4.
>
> Here's the thing - the same script WORKS on the old server, and not on
> the new, and I don't know why.
>
> The problem is an age old one - I have jobs that take hours, I want
> users to submit these jobs over CGI, I want the cgi script to submit a
> job "in the background", tell the user they'll be e-mailed the results,
> and then exit after submitting the job.
>
> This happens on my old server; it doesn't on my new one. Same script,
> same data, same everything apart from the OS and apache version.
>
> The solution I got many years ago was to make sure all my file handles
> are closed - they are.
>
> CGI.pm version on old server is: 2.8.1
> CGI.pm version on new server is: 3.2.9
>
> Mail::Sender.pm version on old server is 0.8.10
> Mail::Sender.pm version on new server is 0.8.13
>
> Perl version on old is 5.8.0
> Perl version on new is 5.8.5
>
> Any help would be appreciated!
>
> Thanks
>
> Michael
>
> The information contained in this message may be confidential or legally
> privileged and is intended solely for the addressee. If you have
> received this message in error please delete it & notify the originator
> immediately.
> Unauthorised use, disclosure, copying or alteration of this message is
> forbidden & may be unlawful.
> The contents of this e-mail are the views of the sender and do not
> necessarily represent the views of the Institute.
> This email and associated attachments has been checked locally for
> viruses but we can accept no responsibility once it has left our
> systems.
> Communications on Institute computers are monitored to secure the
> effective operation of the systems and for other lawful purposes.
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server
> Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
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>
>
> ---------------------------------------------------------------------
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>
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RE: [users@httpd] Submitting jobs remotely over CGI, closing file handles etc
Posted by "michael watson (IAH-C)" <mi...@bbsrc.ac.uk>.
Hi
Thanks for the reply. When I mention that the cgi script "doesn't
work", well, it does actually work in that it runs the job and
everything is fine - except on my old server, the cgi script starts the
job, and exits immediately after informing the user; on the new server,
the cgi script waits until the job has completed before exiting, so my
users get the experience of a web-page taking a really long time to
load.
I'm pretty sure there is just an open handle, probably in one of the
modules I mentioned below, I just need to find it :)
Thanks
Michael
________________________________
From: Patrick Horgan [mailto:phorgan1@gmail.com]
Sent: 19 June 2008 18:14
To: users@httpd.apache.org; michael watson (IAH-C)
Subject: Re: [users@httpd] Submitting jobs remotely over CGI, closing
file handles etc
michael watson (IAH-C) wrote:
OK, so no answers from this then... Instead, can anyone tell me
how I
can monitor whether (and which) file handles are open whilst the
CGI
script is running?
lsof -unameofuserrunningcgiscript
for example on my machine apache runs as www-data, so I'd type lsof
-uwww-data
Please read the man page for more information, for example, if the cgi
script is short lived, you might want to put lsof in repeat mode with no
delay redirected to a log file, and then kill it after the script
finishes to find out if you caught it;)
In general, I'd add side effects into your script to allow you to follow
it's progress--I assume you've already checked all the logs and there's
nothing in there to tell you what went wrong. i.e. does the cgi access
show up in your access log? You mention only that it doesn't work on
the new server, but don't mention what message you get. For example if
I try to access a script that my server doesn't have read access to, the
server returns a page that says " Warning: Unknown: failed to open
stream: Permission denied in Unknown on line 0" and then tells me the
name of the file it couldn't open. Unless you tell us more about how it
fails, it's hard to help.
Patrick
-----Original Message-----
From: michael watson (IAH-C) [mailto:michael.watson@bbsrc.ac.uk]
Sent: 16 June 2008 09:42
To: users@httpd.apache.org
Subject: [users@httpd] Submitting jobs remotely over CGI,
closing file
handles etc
Dear All
I solved this problem some years ago by writing to this list and
carrying out the suggestions. Oddly, I now have it again.
I am running two servers - an old one, running SuSe 8.2 and
apache
1.3.28, and a relatively new one running Red Hat EL 4 and Apache
2.2.4.
Here's the thing - the same script WORKS on the old server, and
not on
the new, and I don't know why.
The problem is an age old one - I have jobs that take hours, I
want
users to submit these jobs over CGI, I want the cgi script to
submit a
job "in the background", tell the user they'll be e-mailed the
results,
and then exit after submitting the job.
This happens on my old server; it doesn't on my new one. Same
script,
same data, same everything apart from the OS and apache version.
The solution I got many years ago was to make sure all my file
handles
are closed - they are.
CGI.pm version on old server is: 2.8.1
CGI.pm version on new server is: 3.2.9
Mail::Sender.pm version on old server is 0.8.10
Mail::Sender.pm version on new server is 0.8.13
Perl version on old is 5.8.0
Perl version on new is 5.8.5
Any help would be appreciated!
Thanks
Michael
The information contained in this message may be confidential or
legally
privileged and is intended solely for the addressee. If you have
received this message in error please delete it & notify the
originator
immediately.
Unauthorised use, disclosure, copying or alteration of this
message is
forbidden & may be unlawful.
The contents of this e-mail are the views of the sender and do
not
necessarily represent the views of the Institute.
This email and associated attachments has been checked locally
for
viruses but we can accept no responsibility once it has left our
systems.
Communications on Institute computers are monitored to secure
the
effective operation of the systems and for other lawful
purposes.
---------------------------------------------------------------------
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RE: [users@httpd] Submitting jobs remotely over CGI, closing file handles etc
Posted by "michael watson (IAH-C)" <mi...@bbsrc.ac.uk>.
OK, so no answers from this then... Instead, can anyone tell me how I
can monitor whether (and which) file handles are open whilst the CGI
script is running?
-----Original Message-----
From: michael watson (IAH-C) [mailto:michael.watson@bbsrc.ac.uk]
Sent: 16 June 2008 09:42
To: users@httpd.apache.org
Subject: [users@httpd] Submitting jobs remotely over CGI, closing file
handles etc
Dear All
I solved this problem some years ago by writing to this list and
carrying out the suggestions. Oddly, I now have it again.
I am running two servers - an old one, running SuSe 8.2 and apache
1.3.28, and a relatively new one running Red Hat EL 4 and Apache 2.2.4.
Here's the thing - the same script WORKS on the old server, and not on
the new, and I don't know why.
The problem is an age old one - I have jobs that take hours, I want
users to submit these jobs over CGI, I want the cgi script to submit a
job "in the background", tell the user they'll be e-mailed the results,
and then exit after submitting the job.
This happens on my old server; it doesn't on my new one. Same script,
same data, same everything apart from the OS and apache version.
The solution I got many years ago was to make sure all my file handles
are closed - they are.
CGI.pm version on old server is: 2.8.1
CGI.pm version on new server is: 3.2.9
Mail::Sender.pm version on old server is 0.8.10
Mail::Sender.pm version on new server is 0.8.13
Perl version on old is 5.8.0
Perl version on new is 5.8.5
Any help would be appreciated!
Thanks
Michael
The information contained in this message may be confidential or legally
privileged and is intended solely for the addressee. If you have
received this message in error please delete it & notify the originator
immediately.
Unauthorised use, disclosure, copying or alteration of this message is
forbidden & may be unlawful.
The contents of this e-mail are the views of the sender and do not
necessarily represent the views of the Institute.
This email and associated attachments has been checked locally for
viruses but we can accept no responsibility once it has left our
systems.
Communications on Institute computers are monitored to secure the
effective operation of the systems and for other lawful purposes.
---------------------------------------------------------------------
The official User-To-User support forum of the Apache HTTP Server
Project.
See <URL:http://httpd.apache.org/userslist.html> for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
" from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org
---------------------------------------------------------------------
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