Announcing the release of BLCR 0.6.0_beta6

From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Fri Aug 17 2007 - 20:11:37 PDT

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    I am pleased to announce the release of the sixth Beta version of BLCR
    0.6.0, now available at  for a source tarball
    or for a source RPM
    The respective MD5 checksums are
    ce26b9e38e08299daf4fadac2f7b881d  blcr-0.6.0_b6.tar.gz
    30d07a6127856027c1efc910d64e4aa0  blcr-0.6.0_b6-1.src.rpm
    This beta includes all the features expected in the 0.6.0 release.  If
    no show-stopper bugs are reported, the full 0.6.0 is expected in about
    10 days.
    There have been many changes in BLCR relative to the 0.5.6 release.
    These are summarized in the NEWS file, a portion of which is reproduced
    Relative to the previous beta, this release has
    - fixed several bugs affecting 32-bit apps on recent 64-bit kernels
    You are receiving this message because you are subscribed to the
    checkpoint_at_lbl_dot_gov mailing list, OR you have recently sent e-mail to
    that list (or to me personally) that indicates an interest in BLCR, OR
    you have reported a bug believed to be fixed in this release.  In the
    near future you can expect announcements of the final 0.6.0 release of
    BLCR, and of any additional betas that precede it.  Those of you not
    subscribed to the mailing list can let me know if you want to be
    excluded from those upcoming announcements.
    NEWS excerpt:
    July, 2007 - DEPRECATED support for LinuxThreads and for Linux 2.4.X kernels
    - Starting with the 0.6.0 release, new bug reports that one cannot reproduce
       under NPTL + Linux 2.6.x will receive little or none of our attention.
       However, we will try to distribute user-contributed fixes for such bugs.
       Note that the 0.6.0 release *does* pass the BLCR test-suite under
       LinuxThreads and/or 2.4.x kernels on the developers' x86 systems.
       However, we have seen test failures on PPC64 when running LinuxThreads
       with a 2.6.12 kernel (Gentoo distro).
    - Beginning with the next "full" release (0.7.0) we will begin to remove
       code in BLCR that exists only to support LinuxThreads and/or Linux 2.4.x.
    - We have not yet decided the fate of support for those 2.4.x kernels which
       include Red Hat's backport of NPTL support (RHL9.0, RHEL, RHAS, etc.).
    - If anybody cares enough about 2.4.x and/or LinuxThreads to volunteer to
       take over testing and maintenance of BLCR on such platforms, let us know.
    August 17, 2007
    Functionality and expanded-support release.
    - This release includes experimental support for PPC64 platforms
        + PPC64 supports both 32- and 64-bit applications.
        + No support for 32-bit kernels.
          Contact us if you would like to help w/ a PPC32 port.
        + No support for 2.4.x kernels
        + Tested with NPTL and kernels 2.6.12 (Gentoo) and 2.6.18 (FC6)
        + There are known problems with BLCR with LinuxThreads
    - This release includes experimental support for ARM platforms.
        + Tested only for 2.6.12 and newer kernels
        + Has a known failure in "bug2003" in the test suite.
          (test simulates a buggy/misbehaved process)
        + Thanks to Anton V. Uzunov <>
          of the Australian Government Department of Defence, Defence
          Science and Technology Organisation for contributing this port.
        + ARM-specific questions should be directed to blcr-arm_at_hpcrd_dot_lbl_dot_gov
    - This release includes experimental support for cross-compilation.
        + See config/cross_helper.c for information on cross-compilation.
        + This has been tested only in the context of the ARM port
        + Thanks to Anton V. Uzonov for motivating and testing this work
    - This release includes a new API for issuing a checkpoint request.
        + Allows a program to request a checkpoint without the need to invoke
          system("cr_checkpoint ...").
        + See comments in include/libcr.h for information on the following:
    - This release adds a mechanism (CR_CHECKPOINT_OMIT) for processes to
       exclude themselves from a checkpoint (useful for batch-system helper or
       shepherd processes).
    - This release makes cr_checkpoint and cr_restart utilities checkpointable
    - This release adds full support for mmap()-based shared memory
        + Repairs the loss of sharing that existed in 0.5.x releases
        + Supports hugetlbfs
    - Default scope of cr_checkpoint is now --tree, rather than --pid.
    - Now checkpoint/restart unlinked open files.
    - Revised handling of certain file-descriptors at restart:
       + No longer override "normal" files with correspondingly-numbered fds
         from cr_restart as that consistently breaks shell "here documents".
       + Restore pipes endpoints that lie outside the checkpoint scope by
         attaching them to stdin or stdout of cr_restart, rather than to its
         correspondingly-numbered fds.
       + Opens of a process's controlling tty are attached to "/dev/tty" at
         restart, even if they were open by their "exact" name at checkpoint
         time (e.g.  "/dev/pts/0").
    - Experimental support for relocatable kernels on x86 and x86-64
    - Expanded test-suite
    - Option to install the testsuite (--enable-testsuite)
    - Support for "install-strip" make target
    - Tested against many scripting and programming language environments:
       + shells:  ash, bash, (t)csh, (pd)ksh and zsh
       + scripting-type languages: perl, python, tcl/expect, ruby and guile
       + java runtime environments: Sun, IBM and GNU
       + misc. language runtimes: php, rep, clisp, emacslisp, gst, ocaml and sml
       + Run "make bonus-tests" to run these tests on your own machine, but be
         warned that the tests themselves are fragile (contain races) and may
         experience random failures.  However, please do report any tests that
         fail consistently.
    - Many minor bug fixes and code cleanups
    Paul H. Hargrove                          PHHargrove_at_lbl_dot_gov
    Future Technologies Group
    HPC Research Department                   Tel: +1-510-495-2352
    Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900

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