[padb] edb fixes

[Duncan Thomas]

I've tested it on a working (REL 4 x86-64) system and it works as
before, so I don't think there are any regressions, though I haven't
tested 32 bit yet - nobody uses it AFAIK.


-- 
Duncan Thomas
HPC Consultant
Mob         : +44 (0)7968 111 883

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> -----Original Message-----
> From: padb-devel-bounces at pittman.org.uk 
> [mailto:padb-devel-bounces at pittman.org.uk] On Behalf Of Ashley Pittman
> Sent: 09 November 2010 18:00
> To: Duncan Thomas
> Cc: padb-devel at pittman.org.uk
> Subject: Re: [padb] edb fixes
> 
> 
> On 9 Nov 2010, at 18:42, Duncan Thomas wrote:
> 
> > The version of edb in padb, which matches the one currently 
> shipped by Vega, doesn't work (specifically, queue extraction 
> doesn't work since the elf reading code can no longer find elan_base).
> > 
> > The issue seems to be that libelan4.so no longer has a 
> DT_HASH, so you have to walk the symbol table in a linear 
> manner. It was also running into a DT_HASH it couldn't work 
> with in an unnamed dynamic section. The new code just skips 
> unnamed sections since they never contain what we want.
> > 
> > I'm not sure the new code is 100% correct, but it seems to 
> work unlike what was there before. Comments off people who 
> understand elf structures better very welcome.
> > 
> > These fixes should find their way into the next Vega 
> release unless problems with them are found.
> 
> Is this to fix a problem with reading the message queues?  
> Given that padb used to work have you been able to test this 
> on a "before" system and verify it still functions correctly?
> 
> Ultimately the edb code isn't widely used and if it works for 
> you then I'm happy with it, we could sit down and go over the 
> elf parsing stuff if it suits you.
> 
> Ashley.
> 
> -- 
> 
> Ashley Pittman, Bath, UK.
> 
> Padb - A parallel job inspection tool for cluster computing 
> http://padb.pittman.org.uk
> 
> 
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