Lustre discuss - Mar 2010 - Problem with flock and perl on Lustre FS

Hi Guys,

How does lustre handle locking?  One of our users is complaining that a perl
module (Sotrable) has trouble with its lock_nstore method when it tries to
use flock.  The following is a hwo they are reporducing this issue:

--
> perl -d -e ''''
Loading DB routines from perl5db.pl version 1.3
Editor support available.

Enter h or `h h'' for help, or `man perldebug'' for more help.

Debugged program terminated.  Use q to quit or R to restart,
 use o inhibit_exit to avoid stopping after program termination,
 h q, h R or h o to get additional info.
 DB<1> use Fcntl '':flock''

 DB<2> open(FOO, ">>/tmp/gh") or die "darn"

 DB<3> flock(FOO, LOCK_EX) || die "SHIE: $!"

 DB<4> close FOO

 DB<5> open(FOO, ">>gh") or die "darn"

 DB<6> flock(FOO, LOCK_EX) || die "SHIE: $!"
SHIE: Function not implemented at (eval
10)[/usr/lib/perl5/5.10.0/perl5db.pl:638] line 2.

 DB<7>
--

Thanks in advance for your assistance.

Regards,
-J
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On 2010-03-05, at 14:49, Jagga Soorma wrote:
> How does lustre handle locking?  One of our users is complaining  
> that a perl module (Sotrable) has trouble with its lock_nstore  
> method when it tries to use flock.  The following is a hwo they are  
> reporducing this issue:
>
>  DB<6> flock(FOO, LOCK_EX) || die "SHIE: $!"
> SHIE: Function not implemented at (eval
> 10)[/usr/lib/perl5/5.10.0/perl5db.pl:638] line 2.
Search the list or manual for "-o flock", "-o localflock",
and "-o
noflock" mount options for the client(s).

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.