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comp / comp.os.linux.advocacy / Swapping like gangbusters!

SubjectAuthor
* Swapping like gangbusters!Chris Ahlstrom
`- Re: Swapping like gangbusters!vallor

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Subject: Swapping like gangbusters!
From: Chris Ahlstrom
Newsgroups: comp.os.linux.advocacy, comp.os.linux.misc
Organization: None
Date: Thu, 7 Nov 2024 14:28 UTC
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: OFeem1987@teleworm.us (Chris Ahlstrom)
Newsgroups: comp.os.linux.advocacy,comp.os.linux.misc
Subject: Swapping like gangbusters!
Date: Thu, 7 Nov 2024 09:28:10 -0500
Organization: None
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So occasionally kswapd will start going whole hog. In combination with Chromium
running and a make -j N job running, the system would slow wayyyyyy down,
with kswapd trying to find a swap partition that did not exist (my bad!).

There's a daemon called swapspace in the Debian repository. But I decided to
try making a swapfile first. Here are the steps ("#" indicates a root prompt or
the use of sudo):

# fallocate -l 4G /swapfile [or see the "dd" command below]
# chmod 600 /swapfile
# mkswap /swapfile
# swapon /swapfile
# vi /etc/fstab, and add:

/swapfile swap swap defaults 0 0 [to make the change permanent at boot]

# swapon --show [to verify]

Alternate command:

# dd if=/dev/zero of=/swapfile bs=1024 count=4194304

Imma go with this for awhile and see how it goes. If you try it, don't blame me
if it fscks up your system :-D

--
The most important early product on the way to developing a good product
is an imperfect version.

Subject: Re: Swapping like gangbusters!
From: vallor
Newsgroups: comp.os.linux.advocacy, comp.os.linux.misc
Date: Thu, 7 Nov 2024 15:06 UTC
References: 1
Path: eternal-september.org!news.eternal-september.org!feeder2.eternal-september.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: vallor@cultnix.org (vallor)
Newsgroups: comp.os.linux.advocacy,comp.os.linux.misc
Subject: Re: Swapping like gangbusters!
Date: 7 Nov 2024 15:06:28 GMT
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On Thu, 7 Nov 2024 09:28:10 -0500, Chris Ahlstrom <OFeem1987@teleworm.us>
wrote in <vgiips$2mgad$2@dont-email.me>:

> So occasionally kswapd will start going whole hog. In combination with
> Chromium running and a make -j N job running, the system would slow
> wayyyyyy down,
> with kswapd trying to find a swap partition that did not exist (my
> bad!).
>
> There's a daemon called swapspace in the Debian repository. But I
> decided to try making a swapfile first. Here are the steps ("#"
> indicates a root prompt or the use of sudo):
>
> # fallocate -l 4G /swapfile [or see the "dd" command below]
> # chmod 600 /swapfile # mkswap /swapfile # swapon /swapfile # vi
> /etc/fstab, and add:
>
> /swapfile swap swap defaults 0 0 [to make the change permanent at
> boot]
>
> # swapon --show [to verify]
>
> Alternate command:
>
> # dd if=/dev/zero of=/swapfile bs=1024 count=4194304
>
> Imma go with this for awhile and see how it goes. If you try it, don't
> blame me if it fscks up your system :-D

Thanks for the heads-up about fallocate(1).

If creating a large file for (say) a virtual host, you might want
to consider truncate(1), which builds a sparse file.

--
-v System76 Thelio Mega v1.1 x86_64 NVIDIA RTX 3090 Ti
OS: Linux 6.11.6 Release: Mint 21.3 Mem: 258G
"If you don't like the news, go out and make some of your own."

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