Re^2: how to localise a problem?

Thanks. That removes one mystery if it's a kernel message! I'm not seeing any evidence of leaks, although sometimes these things flare up suddenly and disappear almost before you can catch them.

I think any kind of trace, monitor or logging is pretty much a non-starter given how long the process runs before it crashes. The monitoring will slow it down and/or create huge logs.

What I have done is put some extra variables into the die message from IPC::Run so hopefully in another couple of days I should know more about the argument data. Whether that will help, I'm not sure, since the program happily recalculates the particular graph when it is restarted.

Comment on Re^2: how to localise a problem?

Replies are listed 'Best First'.
Re^3: how to localise a problem? by McA (Priest) on Nov 26, 2012 at 19:31 UTC
Hi, I do see the problem of logging everything. But in your case I'm pretty sure that you have to see the whole process until the argument list is too long. I guess that there is some weired case of accumulation as I said before. Anyway, IMHO you don't have to change the code of IPC::Run, as I'm sure you could catch the argument list this way (only an example): `my $gv = GraphViz2->new(%args); eval { $gv->run(); }; if(my $rc = $@) { print STDERR "argument string: " . $gv->dot_input . "\n"; confess $rc; }` [download] I'm really curious whether you catch your bug. Perhaps you have the time to tell us. Happy digging McA	[reply] [d/l]

Replies are listed 'Best First'.

Re^3: how to localise a problem?
by McA (Priest) on Nov 26, 2012 at 19:31 UTC

Hi,

I do see the problem of logging everything. But in your case I'm pretty sure that you have to see the whole process until the argument list is too long. I guess that there is some weired case of accumulation as I said before.

Anyway, IMHO you don't have to change the code of IPC::Run, as I'm sure you could catch the argument list this way (only an example):

my $gv = GraphViz2->new(%args);
eval {
   $gv->run();
};
if(my $rc = $@) {
   print STDERR "argument string: " . $gv->dot_input . "\n";
   confess $rc;
}
[download]

Happy digging
McA

[reply]
[d/l]