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Re: How to use zram ?

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On 09/28/2017 11:56 AM, tomas@tuxteam.de wrote:
> On Thu, Sep 28, 2017 at 11:47:56AM +0200, Pierre Couderc wrote:
>> I have found no howto for zram under debian,  nor even the word
>> "zram" in the archives of this list !
>>
>> I have tried to use zramctl but it refuses with :
>>
>> root@nous:~# zramctl --find --size 1024M
>> zramctl: no free zram device found
>>
>> I suppose I should init something somewere, but what ?
>>
>> On the contrary ubuntu has a dedicated zram-config to make the job.
>>
>> Thanks for any help.
> I didn't even know what it is -- but the zram(8) man page and a little
> guesswork at least leads in some direction.
>
> I assume you'd want to load the zram kernel module (sudo modprobe zram,
> I'd guess) to be in in the fun.
>
> There's some doc about the Linux kernel module itself (just follow the
> link in the above man page).
>
> Let us know how it works out and... make a backup first!
>
>
Thank you very much. I have not found "the zram(8) man page "... But It 
seems to work :

root@nous:~# modprobe zram num_devices=2
root@nous:~# zramctl --find --size 1024M
/dev/zram0
root@nous:~# zramctl --find --size 1024M
/dev/zram1
root@nous:~# free -th
               total        used        free      shared buff/cache   
available
Mem:           3.8G         73M        3.6G        5.5M 146M        3.5G
Swap:            0B          0B          0B
Total:         3.8G         73M        3.6G
root@nous:~# mkswap /dev/zram0
Setting up swapspace version 1, size = 1024 MiB (1073737728 bytes)
no label, UUID=66e3aa01-a4b8-4308-b317-608c6a072810
root@nous:~# free -th
               total        used        free      shared buff/cache   
available
Mem:           3.8G         73M        3.6G        5.5M 146M        3.5G
Swap:            0B          0B          0B
Total:         3.8G         73M        3.6G
root@nous:~# swapon /dev/zram0
root@nous:~# free -th
               total        used        free      shared buff/cache   
available
Mem:           3.8G         73M        3.6G        5.5M 147M        3.5G
Swap:          1.0G          0B        1.0G
Total:         4.8G         73M        4.6G
root@nous:~# mkswap /dev/zram1
Setting up swapspace version 1, size = 1024 MiB (1073737728 bytes)
no label, UUID=69b8070b-3b8d-4234-a773-a59812e54552
root@nous:~# swapon /dev/zram1
root@nous:~# free -th
               total        used        free      shared buff/cache   
available
Mem:           3.8G         74M        3.6G        5.5M 147M        3.5G
Swap:          2.0G          0B        2.0G
Total:         5.8G         74M        5.6G
root@nous:~#

Now I suppose I shouls put that in a systemd script...

Thank you very much.

PC

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Thread

How to use zram ? Pierre Couderc <pierre@couderc.eu> - 2017-09-28 11:50 +0200
  Re: How to use zram ? <tomas@tuxteam.de> - 2017-09-28 12:00 +0200
    Re: How to use zram ? Pierre Couderc <pierre@couderc.eu> - 2017-09-28 12:30 +0200
      Re: How to use zram ? <tomas@tuxteam.de> - 2017-09-28 14:10 +0200
      Re: How to use zram ? David Baron <dbaron770@gmail.com> - 2017-09-28 14:20 +0200
        Re: How to use zram ? Pierre Couderc <pierre@couderc.eu> - 2017-09-28 16:50 +0200
      Re: How to use zram ? Richard Owlett <rowlett@cloud85.net> - 2017-09-28 17:00 +0200
  Re: How to use zram ? <tomas@tuxteam.de> - 2017-09-28 16:00 +0200
    Re: How to use zram ? Gene Heskett <gheskett@shentel.net> - 2017-09-28 16:20 +0200
      Re: How to use zram ? <tomas@tuxteam.de> - 2017-09-28 16:40 +0200
        Re: How to use zram ? Gene Heskett <gheskett@shentel.net> - 2017-09-28 17:50 +0200
          Re: How to use zram ? Greg Wooledge <wooledg@eeg.ccf.org> - 2017-09-28 17:50 +0200
        Re: How to use zram ? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2017-09-28 18:10 +0200
          Re: How to use zram ? <tomas@tuxteam.de> - 2017-09-28 19:20 +0200
      Re: How to use zram ? Pierre Couderc <pierre@couderc.eu> - 2017-09-28 17:00 +0200
        Re: How to use zram ? Nicholas Geovanis <nickgeovanis@gmail.com> - 2017-09-28 17:20 +0200
    Re: How to use zram ? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2017-09-28 18:00 +0200
  Re: How to use zram ? Gene Heskett <gheskett@shentel.net> - 2017-09-28 16:00 +0200
    Re: How to use zram ? Pierre Couderc <pierre@couderc.eu> - 2017-09-28 17:00 +0200

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