From: Karthik Gopalakrishnan (gopalakk_at_cse.ohio-state.edu)
Date: Fri Jul 03 2009 - 15:51:39 PDT
Hi Paul. Thank You very much. I am sorry I missed looking at libcr.h. Regards, Karthik On Fri, Jul 3, 2009 at 6:29 PM, Paul H. Hargrove<PHHargrove_at_lbl_dot_gov> wrote: > Karthik, > If you return from the callback w/o calling cr_checkpoint(), then BLCR will > behave as if it was called as the last statement in your callback. So, not > calling cr_checkpoint() will allow the checkpoint request to proceed > normally. If you want to prevent the checkpoint from being taken, you may > do so my calling cr_checkpoint() with an argument other than > CR_CHECKPOINT_READY, probably CR_CHECKPOINT_OMIT or > CR_CHECKPOINT_TEMP_FAILURE. Quoting from libcr.h: >> >> // Defined values for "flags" (mutually exclusive): >> // CR_CHECKPOINT_READY (==0) >> // The normal case. >> // CR_CHECKPOINT_OMIT >> // To continue the checkpoint, but exclude the current process. >> // Will also not run subsequent callbacks in the current group >> // (thread context, or signal context in this same thread). >> // CR_CHECKPOINT_TEMP_FAILURE >> // CR_CHECKPOINT_TEMP_FAILURE_CODE(error_code) >> // To abort the checkpoint and continue execution. >> // Will also not run subsequent callbacks in the current group >> // (thread context, or signal context in this same thread). >> // CR_CHECKPOINT_PERM_FAILURE >> // CR_CHECKPOINT_PERM_FAILURE_CODE(error_code) >> // To abort the checkpoint and kill all the processes involved in it. >> // Will also not run subsequent callbacks in the current group >> // (thread context, or signal context in this same thread). > > -Paul > > > Karthik Gopalakrishnan wrote: >> >> Hi Folks. >> >> I understand that cr_checkpoint() should be called *only* from the >> callback function's context. However, is it mandatory to call >> cr_checkpoint() every time the callback gets invoked? >> >> Say my callback got invoked because someone did a 'cr_checkpoint -p >> <PID>' from the shell. If I want to ignore this checkpoint request, >> can I simply return from the callback without invoking >> cr_checkpoint(), or will this violate BLCR semantics? >> >> Thanks & Regards, >> Karthik >> > > > -- > Paul H. Hargrove PHHargrove_at_lbl_dot_gov > Future Technologies Group Tel: +1-510-495-2352 > HPC Research Department Fax: +1-510-486-6900 > Lawrence Berkeley National Laboratory >