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Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for
From: |
Lisandro Damián Nicanor Pérez Meyer |
Subject: |
Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve? |
Date: |
Wed, 08 May 2019 14:26:50 -0300 |
El miércoles, 8 de mayo de 2019 14:16:28 -03 Gary E. Miller escribió:
> Yo Lisandro!
>
> On Wed, 08 May 2019 11:33:02 -0300
>
> Lisandro Damián Nicanor Pérez Meyer <address@hidden> wrote:
> > El miércoles, 8 de mayo de 2019 08:21:02 -03 Greg Troxel escribió:
> > [snip]
> >
> > > My memory is fuzzy, but I'm pretty sure I''ve seen macs (macos)
> > > enter sleep in the middle of a huge compilation. My impression has
> > > been that entering sleep is about timeouts from keyboard/mouse and
> > > the implied human.
> > >
> > > Systems have all sorts of background processes, like syslog and
> > > cron. So this may well be true, but it doesn't seem obviously
> > > sensible.
> > >
> > > Hence my notion of something specific that can be looked up and the
> > > details read about.
> >
> > I also agree it does not strictly depends upon gpsd, so I changed the
> > wording to "might keep".
> >
> > In fact I would like to know a single case in which this might happen.
>
> I hate sleep and suspend, so I'm the wrong guy to test it.
>
> I tried to google it, but instead I found lots of references to how to
> prevent sleeping in Linux...
>
> Can someone that uses sleep test this?
>
> I can't see an obvious difference from the command line:
>
> # gps -n /dev/ttyACM0
>
> # ps -el | fgrep gpsd
> F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
> 5 S 65534 26585 1 0 70 -10 - 3512 core_s ? 00:01:07 gpsd
>
> # killall gpsd
>
> # gpsd /dev/ttyACM0
>
> # ps -el | fgrep gpsd
> F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
> 5 S 65534 20269 1 0 70 -10 - 1462 core_s ? 00:00:00 gpsd
>
> Both cases the gpsd is in interruptable sleep (S) waiting on "core_s".
> Then wakes up periodically to check for inbound connections. With -n
> case also wakes up to check the serial in buffer.
>
> top shows a increase with -n on a RasPi 3 from 0% to 1 or 2% CPU load.
>
> I know any long term process using 2% on my android will get me nags
> about sleep being prevented.
>
> On Linux there are vague references to "CPU must be idle" to enter long
> term sleep/hibernate. Unclear if 1% is close enough to idle...
>
> Can someone that uses sleep test this?
I'll see to get a laptop in which to test this, mine is already 10+yo and it's
battery it's... dead.
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- [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Adam Serbinski, 2019/05/05
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Lisandro Damián Nicanor Pérez Meyer, 2019/05/05
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Gary E. Miller, 2019/05/06
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Gary E. Miller, 2019/05/06
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Lisandro Damián Nicanor Pérez Meyer, 2019/05/07
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Greg Troxel, 2019/05/07
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Gary E. Miller, 2019/05/07
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Greg Troxel, 2019/05/08
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Lisandro Damián Nicanor Pérez Meyer, 2019/05/08
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Gary E. Miller, 2019/05/08
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?,
Lisandro Damián Nicanor Pérez Meyer <=
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- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Gary E. Miller, 2019/05/30
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Gary E. Miller, 2019/05/08
- Re: [gpsd-dev] Fwd: Re: gpsd for time sync on Ubuntu remix too hard for normals - how to improve?, Greg Troxel, 2019/05/09