[gpfsug-discuss] AFM negative file caching

Peter Serocka peserocka at gmail.com
Wed May 30 13:26:46 BST 2018


As a quick means, why not adding /usr/lib64 at the beginning of LD_LIBRARY_PATH?

(Not to get started on using LD_LIBRARY_PATH in the first place…)


— Peter

> On 2018 May 30 Wed, at 13:52, Simon Thompson (IT Research Support) <S.J.Thompson at bham.ac.uk> wrote:
> 
> Hi All,
>  
> We have a file-set which is an AFM fileset and contains installed software.
>  
> We’ve been experiencing some performance issues with workloads when this is running and think this is down to LD_LIBRARY_PATH being set to the software installed in the AFM cache, e.g.
>  
> /gpfs/apps/somesoftware/v1.2/lib
>  
> Subsequently when you run (e.g.) “who” on the system, LD_LIBRARY_PATH is being searched for e.g. libnss_ldap, which is in /usr/lib64. We’re assuming that AFM is checking with home each time the directory is processed (and other sub directories like lib/tls) and that each time AFM is checking for the file’s existence at home. Is there a way to change the negative cache at all on AFM for this one file-set? (e.g as you might with NFS). The file-set only has applications so changes are pretty rare and so a 10 min or so check would be fine with me.
>  
> Thanks
>  
> Simon 
>  
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