Monitor thread count
watch -n 0.5 "ps -eLf | grep traffic_server | wc -l"
linux/
High CPU usage on youtube in fedora
I’ve started to experience quite high CPU usage when watching youtube videos on 1440p screen (video sample). By default, youtube loads videos in VP9 codec. Using this codec results in 80% CPU usage (i3-8100T). By installing this extension enhanced-h264ify and by blocking VP8, VP9 and AV1, youtube will load videos in avc1(h.264) codec. The CPU usage is down to about 30%.
Unfortunately, this will disable all 4k videos - they are available only in VP9.
Add exit code to the command line
Some examples to add exit code to command line prompt in bash (put it into ~/.bashrc):
export PS1="\[\033[01;31m\]\$([ \$? == 0 ] || echo \"!\$? \" )\[\033[00m\]\[\033[01;32m\]\t \[\033[01;34m\]\w\[\033[00m\]\[\033[1;32m\]\n\$ \[\033[m\]"
Add to the default PS1 in CentOS:
export PS1="\[\033[01;31m\]\${?##0}\[\033[00m\][\u@\h \W]\\$"
Disable touchpad in Microsoft All-in-one media keyboard
List all available input devices:
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech M185 id=10 [slave pointer (2)]
⎜ ↳ Microsoft Microsoft® Nano Transceiver v2.0 Consumer Control id=14 [slave pointer (2)]
⎜ ↳ Microsoft Bluetooth Mouse id=20 [slave pointer (2)]
⎜ ↳ Microsoft Microsoft® Nano Transceiver v2.0 Consumer Control id=13 [slave pointer (2)]
⎜ ↳ Microsoft Microsoft® Nano Transceiver v2.0 Mouse id=12 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ Microsoft Microsoft® Nano Transceiver v2.0 id=11 [slave keyboard (3)]
↳ Microsoft Microsoft® Nano Transceiver v2.0 System Control id=15 [slave keyboard (3)]
↳ Dell WMI hotkeys id=16 [slave keyboard (3)]
↳ Logitech M185 id=17 [slave keyboard (3)]
↳ Microsoft Microsoft® Nano Transceiver v2.0 Consumer Control id=18 [slave keyboard (3)]
↳ Microsoft Microsoft® Nano Transceiver v2.0 Consumer Control id=19 [slave keyboard (3)]
↳ Microsoft Bluetooth Mouse Keyboard id=21 [slave keyboard (3)]
The touchpad device is known as Microsoft Microsoft® Nano Transceiver v2.0 in the system. Disable it with this command:
xinput disable 12
And enable it again with this command:
xinput enable 12
Or one-liner:
xinput enable `xinput list | grep "Microsoft Microsoft® Nano Transceiver v2.0 Mouse" | grep -oP "id=[0-9]*" | grep -oP "[0-9]*"`
Fedora 33: font rendering
Packages from this repository improve font rendering in fedora a lot:
sudo dnf copr enable dawid/better_fonts -y
sudo dnf install fontconfig-font-replacements fontconfig-enhanced-defaults levien-inconsolata-fonts -y
gsettings set org.gnome.desktop.interface document-font-name "Cantarell 11"
gsettings set org.gnome.desktop.interface font-name "Cantarell 11"
gsettings set org.gnome.desktop.interface monospace-font-name "Inconsolata 13"
i5-9400H CPU benchmark
CPU benchmark from Dell Precision 5540 i5-9400H
$ sysbench cpu run --time=5
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 10000
Initializing worker threads...
Threads started!
CPU speed:
events per second: 1352.90
General statistics:
total time: 5.0007s
total number of events: 6767
Latency (ms):
min: 0.70
avg: 0.74
max: 1.59
95th percentile: 0.77
sum: 4999.03
Threads fairness:
events (avg/stddev): 6767.0000/0.00
execution time (avg/stddev): 4.9990/0.00
i3-8100T CPU benchmark
CPU benchmark from Dell Optiplex 3060 micro i3-8100T
$ sysbench cpu run --time=5
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Prime numbers limit: 10000
Initializing worker threads...
Threads started!
CPU speed:
events per second: 1029.12
General statistics:
total time: 5.0007s
total number of events: 5148
Latency (ms):
min: 0.97
avg: 0.97
max: 1.11
95th percentile: 0.97
sum: 4999.22
Threads fairness:
events (avg/stddev): 5148.0000/0.00
execution time (avg/stddev): 4.9992/0.00
Log denied connections in firewalld
Edit file /etc/sysconfig/firewalld:
FIREWALLD_ARGS=--debug=10
Debug route table
List all routes in system:
route -n
Get route for a specific IP:
ip route get 1.1.1.1
Run command on suspend
Create a file located in /usr/lib/systemd/system-sleep directory:
#!/bin/sh
if [ "${1}" == "pre" ]; then
nordvpn d
elif [ "${1}" == "post" ]; then
echo "Hello"
fi