Le 09/11/2015 13:56, Simon Hobson a écrit :
Didier Kryn <[email protected]> wrote:
Why the hell did they invent suspend-to-disk?
I take it you don't like the idea ?
No. I don't dislike the idea. I admit it is brillant.
I'm confused then - but that's not hard !
This leads to the conclusion: boot time doesn't matter if you never shut down,
but it matters if you do it often.
Yes and yes
We might have reached this conclusion earlier :-)
Yes !
but there also has been a discussion on the reality of the gain in boot time.
Yes, and the consensus seemed to be that for many workloads, on or both of the
following are true :
1) The "services start time" is only part of the overall boot time, and shortening it by
"a bit" won't make a huge difference.
2) Parallel starting services often won't make a huge difference to startup
time, and in some (probably rare) cases may actually make it longer.
Maybe you never shutdown, but some, like me, prefer to put their laptop back in
a well-know state from time to time.
Indeed, I do reboot from time to time. Sometimes it's because I didn't keep an eye on
battery state - it's getting towards the end of it's life and I can no longer rely on the
"low battery warning, followed a while later by a forced sleep and suspend to
disk" that happens with a healthy battery. More often it's to clear memory -
something seems to have a leak, and I'm not that convinced OS X memory management is all
that good.
But normally, I just use sleep mode.
When I was testing a static build of vdev, I used to reboot my
laptop several times per hour, alternatively to Debian Wheezy and to a
minimalistic OS on a USB stick, containing essentially vdev and busybox.
Reboot time is around 30s, yet it's still irritating.
Bios + Grub + kernel startup take by far the biggest part, but I
think there's room for progress on these.
Didier
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