Re: Is there a way to make the pi use swap?
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.
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
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
>> >
>> > 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/syste
>>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,shortna
>>me=mixed,errors=remount-ro 0 0 /dev/sda1 /media/boot vfat
>> rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortna
>>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>
>
>
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