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Full Discussion: Shared Library Issue HP UX
Operating Systems HP-UX Shared Library Issue HP UX Post 302342956 by sambarusty on Tuesday 11th of August 2009 05:51:14 PM
Old 08-11-2009
More information
I have tracked this issue to being something about memory locking over NFS. As soon as the process goes to mlockall, we update the modification time on the shared library. And if the shared library is read only, we get a Page I/O modification error. If I put the libraries local to the machine, it doesn't happen. So it seems to be some sort of NFS conflict. Has anyone seen this type of thing before?

---------- Post updated at 05:51 PM ---------- Previous update was at 06:35 AM ----------

found I was able to reproduce the symptom with just a hello world type of app.
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>

void main()
{
mlockall(CTL_CURRENT)
printf("hello world\n");
}

linked by the following
cc hello_world.c -o hello_world -L/opt/mlib/lib/pa2.0 -lveclib -llapack -Wl,s+

our home directories are NFS mounted so if I copy pa2.0 to /home/mine/pa2.0 and check the timestamp then
change my SHLIB_PATH EV to point to /home/mine/pa2.0
the timestamps change from the original copy after I run hello_world.
 

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LEARN ABOUT OPENSOLARIS

ld

ld(1B)						     SunOS/BSD Compatibility Package Commands						    ld(1B)

NAME

       ld - link editor, dynamic link editor

SYNOPSIS

       /usr/ucb/ld [options]

DESCRIPTION

       /usr/ucb/ld  is	the  link  editor  for	the BSD Compatibility Package. /usr/ucb/ld is identical to /usr/bin/ld (see ld(1)) except that BSD
       libraries and routines are included before the base libraries and routines.

OPTIONS

       /usr/ucb/ld accepts the same options as /usr/bin/ld, with the following exceptions:

       -Ldir	    Add dir to the list of directories searched for libraries by /usr/bin/ld. Directories specified with this option are  searched
		    before /usr/ucblib and /usr/lib.

       -Y LU,dir    Change the default directory used for finding libraries.

		    This option can have unexpected results, and should not be used.

FILES

       /usr/lib

       /usr/lib/libx.a

       /usr/ucblib

       /usr/ucblib/libx.a

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ar(1), as(1), cc(1B), ld(1), lorder(1), strip(1), tsort(1), attributes(5)

SunOS 5.11							    28 Jun 2007 							    ld(1B)
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