[SOLVED] odd problem at building qt5 on slackware64 current

marav · 03-12-2022, 05:47 AM

Quote:

Originally Posted by nobodino

error message?

Code:

root@darkstar64-2:/etc/rc.d# ./rc.local start
/etc/rc.d/rc.swapinzram: ligne 25 : echo: erreur d'écriture : Ne peut allouer de la mémoire
mkswap: erreur*: la zone d'échange (swap) doit être d'au moins 40*Kio
swapon: /dev/zram2*: échec de lecture d'en-tête d'espace d'échange

Have you kept the defaut settings ?
It works well here, even without a swap

Code:

blackstar:~:# swapoff /dev/nvme0n1p2
blackstar:~:# /etc/rc.d/rc.swapinzram start
Setting up swapspace version 1, size = 22.6 GiB (24252043264 bytes)
no label, UUID=8163cbe0-300e-4fe8-b43e-aa289607f20c

I only change that:

Code:

blackstar:~:# sed -E '/^(#|$)/d' /etc/swapinzram.conf
 PERCENTAGE=150

Code:

# grep -i zram .config
CONFIG_ZRAM=m
CONFIG_ZRAM_DEF_COMP_LZORLE=y
# CONFIG_ZRAM_DEF_COMP_ZSTD is not set
# CONFIG_ZRAM_DEF_COMP_LZ4 is not set
# CONFIG_ZRAM_DEF_COMP_LZO is not set
# CONFIG_ZRAM_DEF_COMP_LZ4HC is not set
# CONFIG_ZRAM_DEF_COMP_842 is not set
CONFIG_ZRAM_DEF_COMP="lzo-rle"
# CONFIG_ZRAM_WRITEBACK is not set
# CONFIG_ZRAM_MEMORY_TRACKING is not set

nobodino · 03-12-2022, 06:16 AM

same errors, here my conf file:

Code:

# Didier Spaier 2020
# Dedicated to the public domain as stated in https://unlicense.org/

# This file records your zram settings for swap. It is sourced by
# /etc/rc.d/swapinzram
# The values set by default in /etc/r.d/swapinzram are commented.
# For more information read:
# /usr/src/linux-<version>/Documentation/admin-guide/blockev/zram.rst
# where <version> is the output of the command: uname -r
# Read also: man swapon 

# To set different values put them after the '=' sign and uncomment the relevant
# lines, removing the '#' sign at their beginning.

# The compression algorithm in use.
# Default: zstd
COMPRESSION_ALGORITHM=zstd

# The percentage of the physical ram allocated to the zram swap device
# This is the not compressed size. The actual (compressed) size depend on the
# compression factor (at most one half of the compressed size).
# Default: 50
PERCENTAGE=150

# The priority is the one of the zram swap device among the swpa spaces.
# We want it to be bigger that that of swap partitions and files so that the
# swap on zram be used first and other swap spaces be used if it becomes full.
# The minimum is -1, the maximum 32567.
# Default: 32657
PRIORITY=32567

# The swappiness tells the kernel how aggressively it should swap memory pages.
# We set it greater than the global default (60) so that swap in zram be used
# soon when  the available RAM becomes low.
# Default: 80
SWAPPINESS=100

my fstab now:

Code:

# /dev/sda2        swap             swap        defaults         0   0
/dev/nvme0n1p2   /                ext4        defaults,noatime,discard         1   1
/dev/sda1        /boot/efi        vfat        defaults         1   0
#/dev/cdrom      /mnt/cdrom       auto        noauto,owner,ro,comment=x-gvfs-show 0   0
/dev/fd0         /mnt/floppy      auto        noauto,owner     0   0
devpts           /dev/pts         devpts      gid=5,mode=620   0   0
proc             /proc            proc        defaults         0   0
tmpfs

Code:

root@darkstar64-2:/mnt/sfs/source/l/qt5# df
Sys. de fichiers blocs de 1K  Utilisé Disponible Uti% Monté sur
tmpfs                  32768     1560      31208   5% /run
devtmpfs                8192        0       8192   0% /dev
/dev/nvme0n1p2      90130888 69282708   16223796  82% /
tmpfs               16427884        0   16427884   0% /dev/shm
cgroup_root             8192        0       8192   0% /sys/fs/cgroup
/dev/sda1             766448    11032     755416   2% /boot/efi
tmpfs                3285576       12    3285564   1% /run/user/0
/dev/nvme0n1p3      50080660 26144492   21359784  56% /mnt/sfs

Code:

root@darkstar64-2:~/scripts# ls -la /dev/zram*
brw-rw---- 1 root disk 251, 0 mars  12 13:22 /dev/zram0
brw-rw---- 1 root disk 251, 1 mars  12 13:22 /dev/zram1

marav · 03-12-2022, 06:24 AM

Do you have a custom kernel or use the stock one ?

You could try the version of Didier:
http://slackware.uk/slint/x86_64/sli...ce/swapinzram/

but except it's not a slackbuild, I think it's the same

nobodino · 03-12-2022, 06:29 AM

modified /ets/fstab

Code:

# /dev/sda2        swap             swap        defaults         0   0
/dev/zram0 none swap defaults 0 0
/dev/zram1 none swap defaults 0 0
/dev/nvme0n1p2   /                ext4        defaults,noatime,discard         1   1
/dev/sda1        /boot/efi        vfat        defaults         1   0
#/dev/cdrom      /mnt/cdrom       auto        noauto,owner,ro,comment=x-gvfs-show 0   0
/dev/fd0         /mnt/floppy      auto        noauto,owner     0   0
devpts           /dev/pts         devpts      gid=5,mode=620   0   0
proc             /proc            proc        defaults         0   0
tmpfs            /dev/shm         tmpfs       nosuid,nodev,noexec 0   0

but df doesn't show the /dev/zram* ?

standard kernel with initrd.

marav · 03-12-2022, 06:38 AM

Quote:

Originally Posted by nobodino

modified /ets/fstab

Code:

# /dev/sda2        swap             swap        defaults         0   0
/dev/zram0 none swap defaults 0 0
/dev/zram1 none swap defaults 0 0
/dev/nvme0n1p2   /                ext4        defaults,noatime,discard         1   1
/dev/sda1        /boot/efi        vfat        defaults         1   0
#/dev/cdrom      /mnt/cdrom       auto        noauto,owner,ro,comment=x-gvfs-show 0   0
/dev/fd0         /mnt/floppy      auto        noauto,owner     0   0
devpts           /dev/pts         devpts      gid=5,mode=620   0   0
proc             /proc            proc        defaults         0   0
tmpfs            /dev/shm         tmpfs       nosuid,nodev,noexec 0   0

but df doesn't show the /dev/zram* ?

standard kernel with initrd.

Nope,
You can display the information with: zramctl

nobodino · 03-12-2022, 06:42 AM

Code:

root@darkstar64-2:/etc/rc.d# ./rc.swapinzram status
No active zram swap block device.
root@darkstar64-2:/etc/rc.d# zramctl
root@darkstar64-2:/etc/rc.d#

nobodino · 03-12-2022, 06:55 AM

followed piece of advice of this page : https://wiki.archlinux.org/title/Imp...#zram_or_zswap

Code:

/etc/modprobe.d/zram.conf

options zram num_devices=2

then :

Code:

/etc/udev/rules.d/99-zram.rules

KERNEL=="zram0", ATTR{disksize}="512M" RUN="/usr/bin/mkswap /dev/zram0"
KERNEL=="zram1", ATTR{disksize}="512M" RUN="/usr/bin/mkswap /dev/zram1"

added to the /etc/fstab:

Code:

/dev/zram0 none swap defaults 0 0
/dev/zram1 none swap defaults 0 0

rebooted and now :

Code:

root@darkstar64-2:/mnt/sfs/source/l/qt5# zramctl 
NAME       ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram1 lzo-rle       512M   0B    0B    0B      32 
/dev/zram0 lzo-rle       512M   0B    0B    0B      32

modified swapinzram file:

Code:

# Didier Spaier 2020
# Dedicated to the public domain as stated in https://unlicense.org/

# This file records your zram settings for swap. It is sourced by
# /etc/rc.d/swapinzram
# The values set by default in /etc/r.d/swapinzram are commented.
# For more information read:
# /usr/src/linux-<version>/Documentation/admin-guide/blockev/zram.rst
# where <version> is the output of the command: uname -r
# Read also: man swapon 

# To set different values put them after the '=' sign and uncomment the relevant
# lines, removing the '#' sign at their beginning.

# The compression algorithm in use.
# Default: zstd
# COMPRESSION_ALGORITHM=zstd
COMPRESSION_ALGORITHM=lzo-rle

# The percentage of the physical ram allocated to the zram swap device
# This is the not compressed size. The actual (compressed) size depend on the
# compression factor (at most one half of the compressed size).
# Default: 50
PERCENTAGE=150

# The priority is the one of the zram swap device among the swpa spaces.
# We want it to be bigger that that of swap partitions and files so that the
# swap on zram be used first and other swap spaces be used if it becomes full.
# The minimum is -1, the maximum 32567.
# Default: 32657
PRIORITY=32567

# The swappiness tells the kernel how aggressively it should swap memory pages.
# We set it greater than the global default (60) so that swap in zram be used
# soon when  the available RAM becomes low.
# Default: 80
SWAPPINESS=100

Code:

root@darkstar64-2:/etc/rc.d# ./rc.swapinzram status
NAME       ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram3 lzo-rle        47G   4K   74B   12K      32 [SWAP]
/dev/zram1 lzo-rle       512M   0B    0B    0B      32 
/dev/zram0 lzo-rle       512M   0B    0B    0B      32

It should be ok now, I hope

Thanks in advance @marav for your time and help.

marav · 03-12-2022, 07:15 AM

Quote:

Originally Posted by nobodino

followed piece of advice of this page : https://wiki.archlinux.org/title/Imp...#zram_or_zswap

It should be ok now, I hope

Thanks in advance @marav for your time and help.

Yep ;-)
Sorry for my poor support for zram
I just did the slackbuild because Didier said he didn't have time. But my skills end there

Let's hope QT5 will build for you now

nobodino · 03-12-2022, 09:38 AM

It worked:

Code:

WARNING:  zero length file usr/include/qt5/QtXmlPatterns/5.15.3/QtXmlPatterns/private/qtxmlpatterns-config_p.h
WARNING:  zero length file usr/include/qt5/QtQuickTemplates2/qtquicktemplates2-config.h
WARNING:  zero length file usr/lib64/qt5/qml/QtQuick/Controls/Styles/Flat/plugins.qmltypes

Slackware package /tmp/qt5-5.15.3_20220304_a657406f-x86_64-1_sfs.txz created.


real    56m41,216s
user    1172m26,384s
sys     314m10,803s

marav · 03-12-2022, 09:57 AM

FTR,

I found the patch here:

Code:

https://ftp.lysator.liu.se/pub/opensuse/source/tumbleweed/repo/oss/src/qt6-webengine-6.2.3-1.3.src.rpm

It was previously available for qt5
qt5-webengine source rpm is no longer available in the repo, but the patch is the same

nobodino · 03-12-2022, 10:41 AM

the original qt5 slackware package builds without any patch, but with swapinzram which is definitively a must have package for slackware (thanks to D. Spaier):

Code:

WARNING:  zero length file usr/include/qt5/QtXmlPatterns/5.15.3/QtXmlPatterns/private/qtxmlpatterns-config_p.h
WARNING:  zero length file usr/include/qt5/QtQuickTemplates2/qtquicktemplates2-config.h
WARNING:  zero length file usr/lib64/qt5/qml/QtQuick/Controls/Styles/Flat/plugins.qmltypes

Slackware package /tmp/qt5-5.15.3_20220304_a657406f-x86_64-1.txz created.


real    56m7,718s
user    1172m47,610s
sys     302m38,705s

nobodino · 03-12-2022, 10:57 AM

Now, I need to build SFS with that configuration and see what will happen.

andrew.46 · 03-12-2022, 03:17 PM

Fascinating, I will set up zram and have another go later today. It would be nice to know how PV manages his compile?

andrew.46 · 03-13-2022, 12:13 AM

Finally with the aid of swapinzram (thanks Didier and Marav!) qt5 has built:

Code:

WARNING:  zero length file usr/include/qt5/QtXml/5.15.3/QtXml/private/qtxml-config_p.h
WARNING:  zero length file usr/lib64/qt5/qml/QtQuick/Controls/Styles/Flat/plugins.qmltypes

Slackware package /tmp/qt5-5.15.3_20220304_a657406f-x86_64-1.txz created.


real    77m31.380s
user    1758m6.027s
sys     329m23.351s
root@ilium/home/andrew/ssd2/Slackware/slackware64-current/source/l/qt5#

So all this time it was simply a memory issue? BTW Marav if you ever want to polish the SlackBuild I saw in passing that you created a place for the docs but no docs. Looks like only README.md.

Edit: I see what has happened, you have:

Code:

cp $CWD/README $PKG/usr/doc/${PRGNAM}-${VERSION}

where you should have:

Code:

cp $CWD/README.md $PKG/usr/doc/${PRGNAM}-${VERSION}

Edit: And I am a little curious as to how much actual RAM is required to compile this version of qt5 without swapping out? I am a little peeved that my own setup failed with physical RAM

franzen · 03-13-2022, 12:32 AM

Quote:

Originally Posted by andrew.46

Fascinating, I will set up zram and have another go later today. It would be nice to know how PV manages his compile?

Pat described it on LQ somewhere, mainly with icecream/JOBS=40 and some buildmachines with plenty of ram if i remember correctly.

A note to zram:
I use it on all my devices since some months, in a similar way Didier does(no udev invoked).
I have no swap-partition/file at all anymore, which especially is helpful on old devices(2gb ram) where e.g. firefox is unusable with swap on a harddisc.
I start zram via rc.zram in rc.S, just where the system-swap is enabled. This way it may be used additionally to harddisc-swap or even exclusive.
Having multible zram devices like

Code:

# zramctl 
NAME       ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram1 lzo-rle       512M   0B    0B    0B      32 
/dev/zram0 lzo-rle       512M   0B    0B    0B      32

has no performance advantages(anymore), all cpu-cores may just be used with a single-zram device.