DMTCP 1.2.5 released

DMTCP (Distributed MultiThreaded Checkpointing) is a tool to transparently checkpoint the state of multiple simultaneous applications, including multi-threaded and distributed applications. It operates directly on the user binary executable, without any Linux kernel modules or other kernel modifications.

Release Notes:
- epoll, eventfd, and signalfd are now supported
- The ARM architecture for Linux is now supported.
(Linux currently supports 32-bit ARM EABI.)
- The name "DMTCP module" is changed to "DMTCP plugin" (more common terminology).
User plugins can greatly customize the behavior of DMTCP.
- The dmtcp_checkpoint cmd was resetting the checkpoint interval even
if the user did not specify the -i/--interval flag. This is now fixed.
- Improved support for a planned Fedora package for DMTCP
- On resume from ckpt, zero pages were sometimes expanded (increasing the
memory footprint). This affected Java. This is now fixed.
- Some bug fixes were provided for programs that intensively create
and destroy threads (e.g. OpenMP, Java)
- After restart, the floating point rounding mode (fesetround) was not being
properly restored. This is now fixed.
- There have been requests for support of DMTCP for PBS/TORQUE. Some partial
support has now been added to the svn only (_not_ to this release).
Please write to us if you need this support from DMTCP.
- The FAQ at the DMTCP web site was expanded.
- 15% slowdown observed in an unusual case:
A user reports that if your program frequently does both of these:
a. is heavily multi-threaded; and
b. calls malloc/free intensively;
This has been diagnosed. It was seen too close to this 1.2.5 release,
and so the fix will be provided for the next release (and in the public svn).

Posted by Kapil Arya 2012-05-27

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