[Gcl-commits] gcl/pargcl configure configure.ac src/Makefile....

[Gene Cooperman]

CVSROOT:        /cvsroot/gcl
Module name:    gcl
Branch:         
Changes by:     Gene Cooperman <address@hidden> 05/12/16 17:50:57

Modified files:
        pargcl         : configure configure.ac 
        pargcl/src     : Makefile.in slave-listener.lsp 
        pargcl/src/mpinu: mpi.c 

Log message:
        I finally found a _bad_ bug.  In GCL o/main.c, we call setrlimit on
        RLIM_STACK.  Under Linux, this triggers a bug in the interaction of 
glibc
        and the Linux kernel.  I am including a tarball to demonstrate this bug,
        and will report the bug to the glibc people once I have confirmed all 
the
        details.  The tarball is at the private URL:
        http://www.ccs.neu.edu/home/gene/tmp/BUG-glibc.tar.gz
        GCL in o/main.c sets the stack to an unreasonably large value,
        and setrlimit silently accepts this.  When pthread_create is later 
called
        from a _child_ process, it fails with "NOT ENOUGH MEMORY".  This only
        happens if it is called from a child process.  Apparently, the remote
        slave process of ParGCL counts as a child process for this purpose.
        This bug could also affect other GCL applications using the foreign
        function interface that do the unusual things that ParGCL does.
        I'll talk to Camm Maguire about this issue in GCL's o/main.c shortly.
        For now, I've added a patch in ParGCL that lowers the setrlimit for
        RLIM_STACK to something reasonable (1 GB) if it is currently 
unreasonably high.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/gcl/gcl/pargcl/configure.diff?tr1=1.10&tr2=1.11&r1=text&r2=text
http://cvs.savannah.gnu.org/viewcvs/gcl/gcl/pargcl/configure.ac.diff?tr1=1.9&tr2=1.10&r1=text&r2=text
http://cvs.savannah.gnu.org/viewcvs/gcl/gcl/pargcl/src/Makefile.in.diff?tr1=1.10&tr2=1.11&r1=text&r2=text
http://cvs.savannah.gnu.org/viewcvs/gcl/gcl/pargcl/src/slave-listener.lsp.diff?tr1=1.5&tr2=1.6&r1=text&r2=text
http://cvs.savannah.gnu.org/viewcvs/gcl/gcl/pargcl/src/mpinu/mpi.c.diff?tr1=1.1&tr2=1.2&r1=text&r2=text