Best way to use zram in Fedora 21?

[Corey Sheldon]

ok to the naming and multi zram devices questions:


1) one single large space is wasteful if you have your machine up for
longer than a  single (or series ) of heavy lifting operations  --say you
are rendering a video and then back to the usual grind stuff would you want
all that extra space just wasted ?  also say a follow up process is in need
of more would you wanna be stuck on previous values?   zram is dynamic in
nature smaller more numerous /dev/zram$i  allows for that and in a dynamic
manner...


2) it the RAM its based off not swap and the "z" is known as dynamic


Corey W Sheldon
Freelance IT Consultant, Multi-Discipline Tutor
310.909.7672
www.facebook.com/1stclassmobileshine

On Thu, Nov 27, 2014 at 7:39 PM, Reindl Harald <h.reindl at thelounge.net>
wrote:

>
>
> Am 28.11.2014 um 01:34 schrieb Zbigniew Jędrzejewski-Szmek:
>
>> On Fri, Nov 28, 2014 at 01:21:26AM +0100, Zbigniew Jędrzejewski-Szmek
>> wrote:
>>
>>> On Thu, Nov 27, 2014 at 04:42:36PM +0100, Juan Orti wrote:
>>>
>>>> El 2014-11-27 14:48, Reindl Harald escribió:
>>>>
>>>>> Am 27.11.2014 um 14:25 schrieb Juan Orti:
>>>>>
>>>>>> Reindl, I'm of the opinion you should upload your scripts to some git
>>>>>> repository and package them to be part of the distribution. I can
>>>>>> co-maintain if you wish
>>>>>>
>>>>>
>>>>> feel free to package it!
>>>>>
>>>>> that's why i attached it as i saw the topic
>>>>> i am not a active packager on the Fedora infrastrcuture
>>>>>
>>>>
>>>> Ok, I've uploaded the scripts to GitHub and submitted a review request:
>>>>
>>>> https://github.com/jorti/zram-swap
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1168692
>>>>
>>> I have a question about the code: why are multiple swap devices needed?
>>> /sys/block/zram0/max_comp_streams can be set to whatever number is
>>> wanted. While it might be useful to have additional zram devices
>>> for different purposes, I don't think more than one zram swap is
>>> useful. If you only have one device, then reloading the module is
>>> no longer necessary to change the parameters, since everything
>>> else seems to be configurable through sysfs.
>>>
>> And another question (sorry, I never used compressed swap before):
>> why not zswap? It seems to be a better fit for the desktop/server
>> environments that Fedora is used for. IIUC, zswap is better because
>> it overflows automatically into the backing swap device
>>
>
> on machines with plenty RAM i prefer not have a swap partition or a swap
> file at all - especially on virtual machines it's a waste of (possible
> expensive SAN) disk storage
>
> on virtual servers currently i prefer zram inside the guest to avoid OOM
> conditions in the guest while the memory compression of the hypervisor
> steps in too late and is more for overcommit the host
>
>
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