Le 09/11/2015 13:56, Simon Hobson a écrit :
> Didier Kryn <kryn@???> 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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Re: [DNG] Detailed technical treati…
