[Beowulf] problem with binary file on NFS

Michael H. Frese Michael.Frese at NumerEx-LLC.com
Thu Jul 24 08:38:28 PDT 2008


It might be that the executable is corrupted by 
NFS during delivery to that node.  Once that 
happens, the cached copy can stay bad.  You can 
check it by comparing md5sum results on that node 
and on the node that owns the original.

There's a thread back in December of last year 
titled "NFS Read Errors" that tells about my 
experience.  I never found a solution except to 
get rid of the Redhat 9 systems....


At 07:24 AM 7/23/2008, you wrote:
>Dear all,
>I have a problem with a selfwritten program on my small cluster. The cluster
>nodes are PIII 500/800 MHz machines, the /home is distributed via NFS from a
>PIII 1 GHz machine. All nodes are running on Debian Etch. The program in
>question (polymc_s) is in the users /home directory and is running on all
>nodes but one. I get the following error messages on that particular node
>ldd polymc_s
>         not a dynamic executable
>  file polymc_s
>polymc_s: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for
>GNU/Linux 2.4.1, dynamically linked (uses shared libs), for GNU/Linux 2.4.1,
>not stripped
>  strace ./polymc_s
>execve("./polymc_s", ["./polymc_s"], [/* 18 vars */]) = -1 ENOMEM (Cannot
>allocate memory)
>+++ killed by SIGKILL +++
>Process 2177 detached
>I am currently running memtest, no problems thus far. Other programs like the
>BOINC stuff (I am using that for stress-testing) are ok. Reuti already
>suggested to do:
>readelf -a polymc_s
>which gave identical outputs on node4 and node3 (both are PIII 500 MHz
>machines). I am somehow stuck here, has anybody got a good idea? Running the
>software locally does not make any difference, i.e. same errors as above.
>Changing the file permissions did not mend it either. I am aware these are
>old nodes, but for the purpose they are ok.
>All the best from Graz!
>Jörg Saßmannshausen
>Institut für Chemische Technologie von Materialien
>Stremayrgasse 16
>8010 Graz
>phone: +43 (0)316 873 8954
>fax: +43 (0)316 873 4959
>homepage: http://sassy.formativ.net/
>Please avoid sending me Word or PowerPoint attachments.
>See http://www.gnu.org/philosophy/no-word-attachments.html
>Beowulf mailing list, Beowulf at beowulf.org
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