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An unexpected perf feature
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LPC: Booting Linux in five seconds
Posted Sep 22, 2008 23:49 UTC (Mon) by anselm (subscriber, #2796)
That's what I used to think, too. Nowadays most of my applications
do a reasonable job of coming up again where I left them before a
shutdown, so it's not a big deal.
Posted Sep 23, 2008 0:26 UTC (Tue) by rlk (guest, #47505)
As I said previously, fast reboot and suspend/resume solve different problems and shouldn't be considered alternatives for each other.
That could be fixed
Posted Sep 23, 2008 1:12 UTC (Tue) by JoeBuck (subscriber, #2330)
Posted Sep 23, 2008 7:29 UTC (Tue) by nix (subscriber, #2304)
Hm, perhaps a shutdown/restart could appear to the Lisp code like all the
process sentinels signalling a process death/network disconnection,
something they have to deal with anyway... obviously you'd also want a
session-save-hook and session-restore-hook, so that things that *want* to
be aware of shutdown/restart can be. (And let's implement it with proper
serialization/deserialization of the in-core Lisp state, not with
unexec()! :) )
Posted Sep 23, 2008 15:00 UTC (Tue) by shapr (guest, #9077)
Posted Sep 23, 2008 15:14 UTC (Tue) by rlk (guest, #47505)
* Shell buffers (input and output history -- including input and output history of the shell, which isn't quite the same thing as the emacs idea of that)
* Command output buffers and other temporary buffers, including *scratch*
* Files that you're looking at that may get changed behind your back that you deliberately haven't reverted yet.
* The state of the lisp world
Obviously, emacs loses all of this if it crashes, but this in the context of choosing to reboot vs. suspend/resume. I'll take my chances on crashes, and I do save my work, but it's still more efficient to keep a session going as long as possible.
Posted Sep 23, 2008 7:54 UTC (Tue) by michaeljt (subscriber, #39183)
But they can take an awful long time to do so. Don't know if suspend/resume is faster, because I have never trusted it enough to find out. Perhaps a middle way would be best of all - suspending and resuming individual applications, perhaps even with the application's cooperation.
Posted Sep 23, 2008 8:23 UTC (Tue) by michaeljt (subscriber, #39183)
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