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| DATE | 2020-11-29 |
| FROM | jc_gargma via artix-general
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| SUBJECT | Re: [Hangout - NYLXS] [artix-general] generating zstd compress
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To: artix-general-at-artixlinux.org
Date: Sat, 28 Nov 2020 22:59:35 -0800
Message-ID: <1655028.u80GFZz8BJ-at-iserlohn-fortress.net>
In-Reply-To:
References: <7633beb1-7faa-b164-ebbf-40885c8b8f90-at-e.email>
<5446106.sXtsSlJIb2-at-iserlohn-fortress.net>
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From: jc_gargma via artix-general
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Subject: Re: [Hangout - NYLXS] [artix-general] generating zstd compress
initrd images
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From: jc_gargma
To: artix-general-at-artixlinux.org
Subject: Re: [artix-general] generating zstd compress initrd images
Date: Sat, 28 Nov 2020 22:59:35 -0800
Message-ID: <1655028.u80GFZz8BJ-at-iserlohn-fortress.net>
In-Reply-To:
References: <7633beb1-7faa-b164-ebbf-40885c8b8f90-at-e.email> <5446106.sXtsSlJIb2-at-iserlohn-fortress.net>
Javier via artix-general wrote:
> Shouldn't that be considered a bug?
Yes. The value of -Tn is ignored by mkintcpio.
The values of --ultra and -n do not seem completely ignored, as the output
image sizes are slightly different, but not in any notable amount considering
the high settings.
--ultra -22 is also not using the several GB of ram that it normally entails.
Javier via artix-general wrote:
> When specified the amount of threads to use, shouldn't zstd actually at least
be executed with that setting?
Unless the input is large enough, zstd does not spawn additional threads,
regardless of the -Tn value.
The number of threads can be indirectly increased by specifying a lower -Bn
value.
xz acts in a similar manner, which can also be worked around by passing a
lower --block-size=n value.
Where zstd -Bn is MB, and xz --block-size=n is bytes.
Javier via artix-general wrote:
> What you experienced is only on artix (well, I don't have any arch box
anymore)?
> I don't see any arch bug related to mkinicpio btw...
I installed archlinux on a spare system. Same results.
And I finally found out why. Viewing the full command shows mkinitcpio is
appending -19 -T0 to all zstd calls, thus any use of -Tn or -n in
mkinitcpio.conf is superseded.
-jc
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From: jc_gargma
To: artix-general-at-artixlinux.org
Subject: Re: [artix-general] generating zstd compress initrd images
Date: Sat, 28 Nov 2020 22:59:35 -0800
Message-ID: <1655028.u80GFZz8BJ-at-iserlohn-fortress.net>
In-Reply-To:
References: <7633beb1-7faa-b164-ebbf-40885c8b8f90-at-e.email> <5446106.sXtsSlJIb2-at-iserlohn-fortress.net>
Javier via artix-general wrote:
> Shouldn't that be considered a bug?
Yes. The value of -Tn is ignored by mkintcpio.
The values of --ultra and -n do not seem completely ignored, as the output
image sizes are slightly different, but not in any notable amount considering
the high settings.
--ultra -22 is also not using the several GB of ram that it normally entails.
Javier via artix-general wrote:
> When specified the amount of threads to use, shouldn't zstd actually at least
be executed with that setting?
Unless the input is large enough, zstd does not spawn additional threads,
regardless of the -Tn value.
The number of threads can be indirectly increased by specifying a lower -Bn
value.
xz acts in a similar manner, which can also be worked around by passing a
lower --block-size=n value.
Where zstd -Bn is MB, and xz --block-size=n is bytes.
Javier via artix-general wrote:
> What you experienced is only on artix (well, I don't have any arch box
anymore)?
> I don't see any arch bug related to mkinicpio btw...
I installed archlinux on a spare system. Same results.
And I finally found out why. Viewing the full command shows mkinitcpio is
appending -19 -T0 to all zstd calls, thus any use of -Tn or -n in
mkinitcpio.conf is superseded.
-jc
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