Starting multiple sessions in BaseX with Perl: compilation failed at Carp.pm
Hi there BaseX people! Original post on StackOverflow: http://stackoverflow.com/questions/38086358/starting-multiple-sessions-in-ba sex-with-perl-compilation-failed-at-carp-pm I wanted to see if I could start multiple BaseX sessions (on a single server) to try some things out, but I can't even get the sessions to launch - heck, I can't even get the Perl script to compile! This is odd to me, because the same code works perfectly without multiple sessions. Let's say I have a subroutine that creates sessions given an amount. E.g. the following code would create 3 sessions (variables for dbhost, user and password left out): CreateSessions(3); # For testing my $session = $sessions[0]; sub CreateSessions { my ($amountofsessions) = @_; our @sessions = (); for (my $i = 0; $i < $amountofsessions; $i++) { my $session = Session->new($dbhost, 1950, $usr, $pw); push(@sessions, $session); } } I also tried other approaches, e.g. creating each session individually and assigning it to a variable, and then building an array with these variables. The same problem occurs: Compilation failed in require at /usr/share/perl5/Carp.pm line 33. When I look up that file and that line, it states: eval { require Carp::Heavy }; Which, I guess, means that I don't have the Carp module installed? But I do not understand why I would need this, and why that the Perl script works when I only create one session. Is it possible to launch multiple sessions from Perl that can work simultaneously, and if so, how do you launch these sessions and access them? It's important to note that in PHP, for another project but the same database, having multiple sessions does work. In other words, there I can have multiple sessions that run in parallel. We're on BaseX 7.9 and Perl 5.10.1. (Old, I know, but I can't change it.) Thank you for your time! Bram
On Wed, 2016-06-29 at 17:56 +0200, Bram Vanroy | KU Leuven wrote:
Hi there BaseX people!
Original post on StackOverflow: http://stackoverflow.com/questions/38086358/starting-multiple-session s-in-ba sex-with-perl-compilation-failed-at-carp-pm
On the command-line, does perl -le 'use Carp::Heavy;' work (i.e. return silently)? If not, try perl -le 'use Carp;' and if that doesn't work, install Carp. If this is a standard Perl installation Carp is included in the core, you should already have Carp::Heavy installed. Make sure your Perl script has use Carp; near the start.
Is it possible to launch multiple sessions from Perl that can work simultaneously, and if so, how do you launch these sessions and access them?
I haven't managed more than one session using the Perl API, whether in parallel or one after the other. Liam -- Liam R. E. Quin <liam@w3.org> The World Wide Web Consortium (W3C)
Hi Liam Thank you for the reply! The command returns silently, and I can manually find the files on our file system as well. I added use Carp; at the top (which I didn't before, assuming that it would be included if necessary by a dependency script) and now I get an error on Carp's Heavy.pm at line 11. The strange thing is that this line doesn't really provide anything useful, it's simply a variable assignment of a version (l. 10-11): # On one line so MakeMaker will see it. use Carp; our $VERSION = $Carp::VERSION; When I try to get the version manually from the command line, this works fine. perl -le 'use Carp; print $Carp::VERSION;' # returns 1.11 I'm at loss. I have no idea at all why the program would crash on such a line! You say you didn't manage to start multiple basex sessions either. Can I ask what the cause of this was? Did Basex' Perl API throw an error, and if so which one? Or couldn't you debug it because of compilation problems similar to my own? Thank you in advance! Bram -----Oorspronkelijk bericht----- Van: Liam R. E. Quin [mailto:liam@w3.org] Verzonden: woensdag 29 juni 2016 19:17 Aan: Bram Vanroy | KU Leuven <bram.vanroy1@student.kuleuven.be>; 'BaseX' <basex-talk@mailman.uni-konstanz.de> Onderwerp: Re: [basex-talk] Starting multiple sessions in BaseX with Perl: compilation failed at Carp.pm On Wed, 2016-06-29 at 17:56 +0200, Bram Vanroy | KU Leuven wrote:
Hi there BaseX people!
Original post on StackOverflow: http://stackoverflow.com/questions/38086358/starting-multiple-session s-in-ba sex-with-perl-compilation-failed-at-carp-pm
On the command-line, does perl -le 'use Carp::Heavy;' work (i.e. return silently)? If not, try perl -le 'use Carp;' and if that doesn't work, install Carp. If this is a standard Perl installation Carp is included in the core, you should already have Carp::Heavy installed. Make sure your Perl script has use Carp; near the start.
Is it possible to launch multiple sessions from Perl that can work simultaneously, and if so, how do you launch these sessions and access them?
I haven't managed more than one session using the Perl API, whether in parallel or one after the other. Liam -- Liam R. E. Quin <liam@w3.org> The World Wide Web Consortium (W3C)
On Wed, 2016-06-29 at 21:47 +0200, Bram Vanroy | KU Leuven wrote:
When I try to get the version manually from the command line, this works fine.
perl -le 'use Carp; print $Carp::VERSION;' # returns 1.11
OK
I'm at loss. I have no idea at all why the program would crash on such a line! Is there by any chance more than one version of Perl on your system? You could try using strace to see which files were accessed - strace ./your-script 2>&1 | grep -i carp might be useful.
You say you didn't manage to start multiple basex sessions either. Can I ask what the cause of this was? Did Basex' Perl API throw an error, and if so which one?
I didn't get an error but my script fails (or throws an exception) the second time I try to use a BaseX session; I can open several but only the first one used with $s->query() actually works. It might be that $query->more() thinks it's got past the end of the results or something. I didn't try for long though. Liam -- Liam R. E. Quin <liam@w3.org> The World Wide Web Consortium (W3C)
So I ran strace and this is the result $ strace perl gendervariatie-multiple.pl 2>&1 | grep -i carp stat("/usr/local/lib64/perl5/Carp.pmc", 0x7fff387d8190) = -1 ENOENT (No such file or directory) stat("/usr/local/lib64/perl5/Carp.pm", 0x7fff387d80e0) = -1 ENOENT (No such file or directory) stat("/usr/local/share/perl5/Carp.pmc", 0x7fff387d8190) = -1 ENOENT (No such file or directory) stat("/usr/local/share/perl5/Carp.pm", 0x7fff387d80e0) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/Carp.pmc", 0x7fff387d8190) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/Carp.pm", 0x7fff387d80e0) = -1 ENOENT (No such file or directory) stat("/usr/share/perl5/vendor_perl/Carp.pmc", 0x7fff387d8190) = -1 ENOENT (No such file or directory) stat("/usr/share/perl5/vendor_perl/Carp.pm", 0x7fff387d80e0) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/Carp.pmc", 0x7fff387d8190) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/Carp.pm", 0x7fff387d80e0) = -1 ENOENT (No such file or directory) stat("/usr/share/perl5/Carp.pmc", 0x7fff387d8190) = -1 ENOENT (No such file or directory) stat("/usr/share/perl5/Carp.pm", {st_mode=S_IFREG|0644, st_size=7611, ...}) = 0 open("/usr/share/perl5/Carp.pm", O_RDONLY) = 4 read(4, "package Carp;\n\nour $VERSION = '1"..., 4096) = 4096 A lot of 'no such file or directory', but I assume that is normal and that Perl just looks until it finds the file? Maybe you can see something that's wrong here? Thanks again! Bram -----Oorspronkelijk bericht----- Van: Liam R. E. Quin [mailto:liam@w3.org] Verzonden: woensdag 29 juni 2016 23:26 Aan: Bram Vanroy | KU Leuven <bram.vanroy1@student.kuleuven.be>; 'BaseX' <basex-talk@mailman.uni-konstanz.de> Onderwerp: Re: [basex-talk] Starting multiple sessions in BaseX with Perl: compilation failed at Carp.pm On Wed, 2016-06-29 at 21:47 +0200, Bram Vanroy | KU Leuven wrote:
When I try to get the version manually from the command line, this works fine.
perl -le 'use Carp; print $Carp::VERSION;' # returns 1.11
OK
I'm at loss. I have no idea at all why the program would crash on such a line! Is there by any chance more than one version of Perl on your system? You could try using strace to see which files were accessed - strace ./your-script 2>&1 | grep -i carp might be useful.
You say you didn't manage to start multiple basex sessions either. Can I ask what the cause of this was? Did Basex' Perl API throw an error, and if so which one?
I didn't get an error but my script fails (or throws an exception) the second time I try to use a BaseX session; I can open several but only the first one used with $s->query() actually works. It might be that $query->more() thinks it's got past the end of the results or something. I didn't try for long though. Liam -- Liam R. E. Quin <liam@w3.org> The World Wide Web Consortium (W3C)
participants (2)
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Bram Vanroy | KU Leuven -
Liam R. E. Quin