Hi Kyle,
We have had this request from multiple users. Luckily, we already
have a solution for this. :-) Please see PR #299:
https://github.com/dmtcp/dmtcp/pull/299
It hasn't been merged into DMTCP-2.5.0 yet; we are hoping to do
that soon. This will eventually go into DMTCP master (and DMTCP-3.0)
as well but will need some minor changes to be compatible with the
new architecture. (Please note that DMTCP-3.0 is a major change in the
architecture and some existing plugins will need to be updated to be
compatible.)
Please let us know if you face any issues.
Thanks,
Rohan
----- Original Message -----
From: "Kyle Harrigan" <[email protected]>
To: "dmtcp-forum" <[email protected]>
Sent: Monday, February 22, 2016 7:00:59 PM
Subject: [Dmtcp-forum] Support for relocating files on restart
I have a use case where I'd like to start up multiple copies, on the same host,
of a checkpoint which has been performed with --checkpoint-open-files enabled.
One issue (perhaps there are others :->) is that as far as I can tell dmtcp
wants to restore files to their original absolute locations (example
/tmp/foo/bar.txt) and there is currently not any way to control this. Is this
true?
If so, I'd envision writing a small plugin which would, for example, allow the
user to specify a unique prefix which would be prepended to all file locations
(including new files created, previous files taken using
--checkpoint-open-files, etc).
Any pitfalls I am missing?
I would also expect this feature to support a use case where, for whatever
reason, you relocate a checkpoint to a target system and can no longer write to
the original file locations (due to permissions or filesystem structure
changes), but it is important to reuse this checkpoint.
I would appreciate any feedback.
Thanks,
Kyle Harrigan
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