lkml.org 
[lkml]   [2008]   [Oct]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [RFC v6][PATCH 0/9] Kernel based checkpoint/restart
    > Oren> For now, yes. But we definitely want this capability in the long
    > Oren> run; otherwise we won't be able to checkpoint a kernel compile
    > Oren> ('make' uses vfork), or anything with 'gdb' running inside, or
    > Oren> 'strace', and other goodies.
    >
    > The strace/gdb example is *really* hard; but for vfork, you just wait
    > until it's over. The interval between vfork and exec/exit should be
    > short enough not to affect the overall time for a checkpoint (and
    > checkpoint can be fairly slow anyway --- on the HPC machines we used
    > to do it on, writing half a terabyte of checkpoint image to disc could take
    > many minutes. In hindsight, we should have multithreaded it).

    we've tried that and it doesn't change a thing if you have only one disk :)
    it might even give worse results as you are increasing context switches.

    > Waiting for a vforked process to exec is less than a millisecond.

    yes that shouldn't be too hard to handle.

    Cheers,

    C.


    \
     
     \ /
      Last update: 2008-10-17 08:47    [W:0.024 / U:1.096 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site