Please make a swap partition optional at installation

Because i have enough RAM i would like to skip the creation of a swap partition at the setup.
Could you please make this available at the next (0.7) release?
lubot

As far as I remember Con Kolivas was testing some VM managers lately in his ck kernels.
These include hard swapiness (in <2.6.8.1-ck4) and mapped watermark (in 2.6.8.1-ck4).
http://members.optusnet.com.au/ckolivas/kernel/
Sun Aug 22 20:19:47 EST 2004
Mapped watermark??
This readjusts the way memory is evicted by lightly removing cached ram once the ram is more than 2/3 full, if less than the "mapped watermark" percent of ram is mapped ram (ie applications). The normal system is to aggresively start scanning ram once it is completely full. The benefits of this are:
1. Allocating memory while ram is being lightly scanned is faster and cheaper than when it is being heavily scanned.
2. There is usually some free ram which tends to speed up application startup times.
3. Swapping is an unusual event instead of a common one if you have enough ram for your workload.
4. It is rare for your applications to be swapped out by file cache pressure.
Disadvantage: Less file cache.
The mapped watermark is configurable so a server for example might be happy to have a lower mapped percentage. The default is 66 and a server might like 33
echo 33 > /proc/sys/vm/mapped
This removes the swappiness knob entirely and deprecates all my previous vm hacks (autoregulated swappiness, hard swappiness, kiflush).
You must be aware that the normal system usually shrinks the memory allocated for buffers & file cache until it becomes close to ZERO, making almost all the memory available for user applications.

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[SOLVED] Please verify: swap partition needed for dm-crypt/LUKS??

Hi,
Can anyone confirm whether or not the following is accurate (from http://wiki.archlinux.org/index.php/Sys … artitions)
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Last edited by jwhendy (2010-10-12 13:27:12)

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Last edited by sailor (2009-03-17 00:47:31)

Sure, it's perfectly possible to use any linux system without swap. including arch.
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I am very new to MAC OS and I have VMWare installed on my MAC upon VMware running window7.
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Csound1 wrote:
Your Mac already has a swapfile, what is a swap partition?
Exactly what it sounds like. A reserved section of disk that is used for swap. Normally the fastest part of the disk (or a dedicated disk) is chosen.
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"swap" partition

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By "hibernation" I mean suspend to disk.
My disk is a bit poor in RAM and the dirsk is slow, so I want to prevent any swap use of my system.
AND I want to use hibernation, in order to boot fatser... and not to loose my workspace state.
With a swap partition, hibernation works nicely.
But any intensive web browser easily lealds to incresed memory usage, hence swap use.
I have lowered the swap priority in /etc/fstab, down to 1 (and even tried 0).
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My plan was hence :
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The first part was easy : I added a "noauto" option in /etc/fstab. Great, no more mounted swap. But, as expected, no more successful hibernation.
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> cat /etc/systemd/system/dev-disk-by\x2duuid-blablablabla.swap
[Unit]
Description=Swap required for hibernation
Before=sleep.target
[Swap]
What=/dev/disk/by-uuid/blablablablabla
Priority=5
>
Next step show be to enable it, but I first run a safety check :
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Id=dev-disk-by\x2duuid-blablablabla.swap
Names=dev-disk-by\x2duuid-blablablabla.swap
Requires=-.mount
Wants=system.slice
BindsTo=dev-disk-by\x2duuid-blablablabla.device
RequiredBy=swap.target
WantedBy=dev-disk-by\x2duuid-blablablabla.device
Conflicts=umount.target
Before=sleep.target umount.target swap.target
After=systemd-journald.socket dev-disk-by\x2duuid-blablablabla.device system.slice -.mount
RequiresMountsFor=/dev/disk/by-uuid/blablablabla
Description=Swap required for hibernation
LoadState=loaded
ActiveState=inactive
SubState=dead
FragmentPath=/etc/systemd/system/dev-disk-by\x2duuid-blablablabla.swap
UnitFileState=static
InactiveExitTimestampMonotonic=0
ActiveEnterTimestampMonotonic=0
ActiveExitTimestampMonotonic=0
InactiveEnterTimestampMonotonic=0
CanStart=yes
CanStop=yes
CanReload=no
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=yes
>
The problem here is that, somehow, a RequiredBy=swap.target line is apaprently automatically added, and makes exactly NOT what I want.
I've been battling a bit with systemd, but so far I have no clue how to do this correctly.
Important : I wand a clean "official" way, not to do a "service" unit that calls an home-brewed script taht calls swapon. I can do that, but systemd should be able to do it better than me, and without any trick.

Hello and thank you all
@fdservices & @WonderWoofy :
In fact, I forgot to mentionned swappiness, just tought about mentionneing the swap priority which act at a very different level is only revelevant when you ahve several swap files.
I have already modified that setting since quite a long time... and it indeed makes the system behaviour so much better.
Honestly, I could do with it... that's what I am doing since a few months in fact, and it really largely improved the user experience.
Still, the setting only makes swapping unlikely, but does not forbid it.
@WonderWoofy & @lucke :
You may be right, I could satisfy with swapiness...
Still, my feeling is that swap at run-time is mostly a remeniscence of the time where having several megabytes of RAM was juste a fantasm. At that time, at least for some intensive operations, simulating more RAM thansk to the cheaper & slower disk capacity was really decisive for a good user experience... and to allow some operations like some huge compilations. My feeling is that today, with our Gigabytes of RAM on our desktop/laptop, the need is much lower. In fact a swap is probably counter-productive for SSD for example (fast, yes, but swap is by nature something you write quite often, reducing teh SSD lifetime significantly). And simulating extra RAM is also counter-productive with applications such as web browsers which handle large amount of memory to handle cache themselves; it causes memory pressure, hence trigger swapping and machien slowdown instead of trigerring their pseudo-smart memory cleaning mechanisms. Last but not least, it does not encourage any improvement on application memory needs and rationalisation.
In fact, unless when I compile huge programs, or on really-limited-memory (embedded) systems, or eventually if swap can be hosted on significantly faster-than-storage disks, I feel that swapping does not really improve the user experience and system performance... and in contrary reduces them by having to handle swapping on and off memory & cache pages.
SO that's why I want to try. It's OK if I fail, swappinees fixes most my user experience issue, but I try to solve my more "theorical" issue as well.
And honestly, it is also to lean & play a bit with systemd as well.
More to come, I have things partially working now. Partially for now, and maybe perfectly with your help ?

[SOLVED] Swap Partition keeps being automounted, but it shouldn't.

Hi,
I created a swap partition as part of setting up a Linux From Scratch installation, and it was intended for that system only. However it is automounted every time I boot my arch.
It is neither mentioned in my fstab or my mtab. I tried # swapoff , and that disables it for that instance, but after boot it's mounted again. Tried giving it an fstab entry with the noauto option.
Last edited by krork (2015-01-05 18:11:24)

Thanks Guys!
I have not yet found a way to stop systemd from automounting the swap partition. I'm a bit busy this January. However, as a workaround I created a swapoff.service file in /etc/systemd/system with this content:
[Unit]
Description=Turns off Swap Partition
DefaultDependencies=no
After=getty.target
[Service]
ExecStart=/usr/bin/swapoff /dev/sdaX
[Install]
WantedBy=multi-user.target
Replace the /dev/sdaX with your according partition, of course.
Edit: Also you'll want to enable it: # systemctl enable swapoff.service
So in case anyone else is having this problem and just wants a dirty fix, this worked for me, for now. If I find out how to keep systemd from automounting in the first place I'll let you know.
Last edited by krork (2015-01-05 16:50:33)

How to uninstall partitioning option in 10gR2 EE?

Hello everybody,
I installed 10gR2 EE and certainly have not seen anything about partitioning. We were two persons installing the software and a database.
When I log onto the database with SQL*Plus it says "with Partitioning option".
Does anyone know how to deinstall this option or what to check/uncheck in installer so that this option will not be installed?
select * from v_$option shows it is installed.
Regards, Heiko
Message was edited by:
hkaschube

Found it at last on my own...
Seems quite simple and fairly obvious:
cd $ORACLE_HOME
jar xvf <<CD_DIR>>/stage/Components/oracle.rdbms.partitioning/10.2.0.1.0/1/DataFiles/filegroup1.jar rdbms/lib/ksnkkpo.o rdbms/lib/kkpoban.o
cd rdbms/lib
make -f ins_rdbms.mk part_off
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But it works.
:o((((((((
Heiko

Please make a swap partition optional at installation

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