Re: Is there a way to make the pi use swap?
Yeah, vmstat shows me
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 1 423424 43348 16380 212828 0 0 6 6 3 2 8 1 92 0 0
Do you have the sw field in your fstab?
/var/swap2 none swap sw 0 0
By the fsstab man page it's the type of the file system. Or maybe
not. The last 2 numbers have to do with dump/restore and fsck.
On 9/14/18, Gene Heskett <gheskett@shentel.net> wrote:
> On Friday 14 September 2018 21:39:02 Alan Corey wrote:
>
>> I don't know about that, I think it's the same in the BSDs and they
>> don't have udev. It's maybe more memory than file.
>>
>> vmstat should show it, and I think there's a swapctl, but those are
>> optionally installed things.
>>
> vmstat seems to be installed, but the system is inactive except
> for a pair of ssh -Y logins from me. It reports:
> $ vmstat
> procs -----------memory---------- ---swap-- -----io---- -system--
> ------cpu-----
> r b swpd free buff cache si so bi bo in cs us sy id
> wa st
> 2 0 0 605904 34156 172824 0 0 14 0 723 539 0 5 94
> 0 0
>
> This in spite of htop saying theres 999 megs of swap available. So the
> above
> needs a good manpage read to decode it. The 0 0 bothers me. Its supposed to
> take an optional delay 10 for and infinite number of updates at 10 second
> intervals, but barfs of the delay keyword. Lotta help that is.
>
> swapctl can't be found.
> pi@picnc:~ $ sudo apt install swapctl
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> E: Unable to locate package swapctl
>
>> If you use Firefox you probably need it:
>> KiB Mem : 949444 total, 30988 free, 678588 used, 239868
>> buff/cache KiB Swap: 4538548 total, 4113588 free, 424960 used.
>> 248532 avail Mem after 6 days of uptime
>
> firefox is not installed.
>
>> On 9/14/18, Gene Heskett <gheskett@shentel.net> wrote:
>> > On Friday 14 September 2018 20:56:28 Gene Heskett wrote:
>> >> On Friday 14 September 2018 20:16:32 Alan Corey wrote:
>> >> > My /etc/fstab just has
>> >> > /var/swap2 none swap sw 0 0
>> >> > That's for a swap file which was made by dding 0s into it, then
>> >> > running mkswap.
>> >> >
>> >> > You'd replace /var/swap2 with /dev/sda2
>
> I just nuked the swapfile in /var. We'll see what amanda does to
> the swap in the morning. ;-)
>
>> >> > Sounds like you're just not loading it from your fstab. Should
>> >> > load every boot. Nothing new or tricky there.
>> >>
>> >> I found an error in the line above that in fstab, # it out.
>> >> Using htop as a swap monitor I can make the swap come and go.
>> >>
>> >> Heres the fstab now:
>> >>
>> >> proc /proc proc defaults
>> >> 0 0 PARTUUID=4fb6ef8f-01 /boot vfat
>> >> defaults 0 2 PARTUUID=4fb6ef8f-02 /
>> >> ext4 defaults,noatime 0 1 # but lets see if a swap can
>> >> be made to work
>> >> PARTUUID="000ba889-02" none swap
>> >> defaults,nofail 0 0 #/dev/sda2 none swap sw,nofail
>> >> # a swapfile is not a swap partition, no line here
>> >> # use dphys-swapfile swap[on|off] for that
>> >> LABEL=bootpi /media/boot vfat defaults
>> >> 0 2 LABEL=workpi1 /media/slash ext4
>> >> defaults,noatime 0 1 LABEL=backuppi /media/backupsd
>> >> ext4 defaults,noatime 0 1 LABEL=workpi120
>> >> /media/work ext4 defaults,noatime 0 1
>> >>
>> >> But it doesn't show in a mount, nor does it show in a cat
>> >> /etc/mtab:
>> >>
>> >> /dev/root / ext4 rw,noatime,data=ordered 0 0
>> >> devtmpfs /dev devtmpfs
>> >> rw,relatime,size=468264k,nr_inodes=117066,mode=755 0 0 sysfs /sys
>> >> sysfs rw,nosuid,nodev,noexec,relatime 0 0
>> >> proc /proc proc rw,relatime 0 0
>> >> tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
>> >> devpts /dev/pts devpts
>> >> rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 tmpfs
>> >> /run tmpfs rw,nosuid,nodev,mode=755 0 0
>> >> tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0
>> >> 0 tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
>> >> cgroup /sys/fs/cgroup/systemd cgroup
>> >> rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/sy
>> >>ste md-cgroups-agent,name=systemd 0 0 cgroup
>> >> /sys/fs/cgroup/cpu,cpuacct cgroup
>> >> rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0 cgroup
>> >> /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0
>> >> 0 cgroup /sys/fs/cgroup/memory cgroup
>> >> rw,nosuid,nodev,noexec,relatime,memory 0 0 cgroup
>> >> /sys/fs/cgroup/devices cgroup
>> >> rw,nosuid,nodev,noexec,relatime,devices 0 0 cgroup
>> >> /sys/fs/cgroup/freezer cgroup
>> >> rw,nosuid,nodev,noexec,relatime,freezer 0 0 cgroup
>> >> /sys/fs/cgroup/net_cls cgroup
>> >> rw,nosuid,nodev,noexec,relatime,net_cls 0 0 tmpfs /etc/machine-id
>> >> tmpfs ro,mode=755 0 0
>> >> systemd-1 /proc/sys/fs/binfmt_misc autofs
>> >> rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct 0
>> >> 0 debugfs /sys/kernel/debug debugfs rw,relatime 0 0
>> >> mqueue /dev/mqueue mqueue rw,relatime 0 0
>> >> configfs /sys/kernel/config configfs rw,relatime 0 0
>> >> fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
>> >> /dev/mmcblk0p1 /boot vfat
>> >> rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shor
>> >>tna me=mixed,errors=remount-ro 0 0 /dev/sda1 /media/boot vfat
>> >> rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shor
>> >>tna me=mixed,errors=remount-ro 0 0 /dev/sdb1 /media/backupsd ext4
>> >> rw,noatime,data=ordered 0 0
>> >> /dev/sda3 /media/slash ext4 rw,noatime,stripe=8191,data=ordered 0 0
>> >> /dev/sdb2 /media/work ext4 rw,noatime,data=ordered 0 0
>> >> tmpfs /run/user/1000 tmpfs
>> >> rw,nosuid,nodev,relatime,size=94520k,mode=700,uid=1000,gid=1000 0 0
>> >> gvfsd-fuse /run/user/1000/gvfs fuse.gvfsd-fuse
>> >> rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0
>> >>
>> >> Which seems to be way too complex, but htop says its there. But I
>> >> did a swapoff -a then a sudo mkswap .dev/sda2 which reported:
>> >> pi@picnc:~ $ sudo mkswap /dev/sda2
>> >> mkswap: /dev/sda2: warning: wiping old swap signature.
>> >> Setting up swapspace version 1, size = 10239996 KiB
>> >> no label, UUID=7b06d9bc-18f2-4c25-957d-f426141664b3
>> >>
>> >> So I copied that UUID into /etc/fstab, making this line:
>> >> UUID=7b06d9bc-18f2-4c25-957d-f426141664b3 swap defaults,nofail
>> >> 0 0 But now its not working at all. What did I screw up?
>> >>
>> >> I rebooted, and its found a 99meg swapfile, probably on the 32GB
>> >> u-sd, but not /dev/sda2 ???
>> >>
>> >> Call me puzzled.
>> >
>> > Got it, mount point was supposed to be none. So swapon is working.
>> > Now, I presume whatever handles this at boot is in /lib/udev.d?
>> > I'll go snoop in there.
>> >
>> > Thanks Alan
>> >
>> >
>> >
>> > --
>> > Cheers, Gene Heskett
>> > --
>> > "There are four boxes to be used in defense of liberty:
>> > soap, ballot, jury, and ammo. Please use in that order."
>> > -Ed Howdershelt (Author)
>> > Genes Web page <http://geneslinuxbox.net:6309/gene>
>
>
>
> --
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
>
>
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