Re: Migrating from 0.7.1 to 0.8.0

From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Wed Jan 07 2009 - 11:58:08 PST

  • Next message: Karthik Gopalakrishnan: "Re: Migrating from 0.7.1 to 0.8.0"
    I don't think you need to migrate to 0.8.x to get away from the 
    cr_request_fd() interface, because  cr_request_checkpoint()  and 
    cr_poll_checkpoint() were added in 0.6.0.
    You mention using cr_wait_checkpoint() and cr_reap_checkpoint(), which 
    *are* new in 0.8.0.  However, the cr_poll_checkpoint() function is 
    approximately equivalent to:
      int err;
      err = cr_wait_checkpoint(handle, timeout);
      if (err < 0) return CR_POLL_CHKPT_ERR_PRE;
      else if (!err) return 0; // Not done
      err = cr_reap_checkpoint(handle);
      if (err < 0) return  CR_POLL_CHKPT_ERR_POST;
      return 1; // Done
    So, I would suggest that you could replace your wait and reap calls with 
    cr_poll_checkpoint() to work correctly for 0.6.0 through 0.8.x.
    I hope this helps.
    Karthik Gopalakrishnan wrote:
    > Hi Paul.
    > My application that used BLCR 0.7.1 would request a checkpoint by
    > calling cr_request_fd() , and cr_checkpoint() in the Callback. Since,
    > cr_request_fd() will obsoleted in 0.8.0, I modified my code to call
    > cr_request_checkpoint() - cr_wait_checkpoint() - cr_reap_checkpoint(),
    > and cr_checkpoint() in the Callback. This scheme seems to work in
    > 0.8.0_b5. However, cr_wait_checkpoint() & cr_reap_checkpoint() are not
    > available in 0.7.1. This forces me to migrate to 0.8.0. I would like
    > to know if there is some implementation that would work on both 0.7.1
    > and 0.8.0.
    > 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     

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