t0mab/gist:160aa9f24b6800f8828a94fee44202dc

## gistfile1.txt
# Stolen from https://adrhc.go.ro/wordpress/ thanks man !!!!!

See also
# https://doc.ubuntu-fr.org/optimisation

Check ubuntu startup times
systemd-analyze blame

/etc/fstab
# http://www.lgqyc.com/move-tmp-to-ram/
# http://jsmylinux.no-ip.org/performance/improving-performance/
# http://askubuntu.com/questions/173094/how-can-i-use-ram-storage-for-the-tmp-directory-and-how-to-set-a-maximum-amount
# http://www.digitalinternals.com/unix/linux-io-performance-tuning-noatime-nodiratime-relatime/388/
#
# mount | grep -P "^tmpfs.+/(tmp|var/run)"
# sudo du -sh /tmp /var/tmp; du -sh /********/apps/tmp /********/apps/var/run /run/user/`id -u` /tmp/tomcat 2>/dev/null
#
tmpfs /tmp tmpfs defaults,relatime,mode=1777,size=4G 0 0
tmpfs /var/tmp tmpfs defaults,relatime,mode=1777,size=99G 0 0
tmpfs /********/apps/tmp tmpfs defaults,relatime,mode=1777,size=2G 0 0
tmpfs /********/apps/run tmpfs rw,nosuid,noexec,relatime,mode=755,size=2G 0 0

Firefox cache
# see http://kb.mozillazine.org/Browser.cache.memory.capacity
# see https://wiki.archlinux.org/index.php/Firefox_on_RAM
# Main disadvantages of this method are that the content of currently browsed web pages is lost if browser
# crashes or after a reboot, and that the settings need to be configured for each user individually.
Open the url: about:config.
browser.cache.disk.enable false
browser.cache.disk.capacity 512000 -> 500M
browser.cache.memory.max_entry_size 512000 -> 500M appcache
browser.cache.memory.enable true
browser.cache.memory.capacity 1048576 -> 1G RAM
See the result in about:cache?device=memory (might require a firefox restart).

Increase the Speed at Which Firefox loads pages
# see also:
http://bgr.com/2009/01/25/a-handful-of-firefox-tweaks-that-will-double-your-browser-speed/
http://www.techfragments.com/481/the-12-best-firefox-aboutconfig-performance-tweaks/

1. Type “about:config” into the address bar and hit Enter.
(Normally the browser will make one request to a web page at a time. When you enable pipelining it will make several at once, which really speeds up page loading.)

2. Alter the entries as follows:
Set “network.http.pipelining” to “true”
Set "network.http.pipelining.ssl” to “true”
see also network.http.proxy.pipelining
network.http.pipelining.maxrequests -> default 32; modified to 6
content.notify.ontimer -> created with value true (default anyway)
content.notify.backoffcount -> created with value 3 (default -1)
content.notify.interval -> default 120 000 microseconds; modified to 500 000

Chromium cache
# see https://wiki.archlinux.org/index.php/Chromium/Tips_and_tricks#Tmpfs
# Chromium with 1G RAM cache; modify in any chromium-browser.desktop (Exec=chromium-browser lines):
chromium-browser --disk-cache-size=1073741824 --disk-cache-dir=/tmp/chromium-cache ...

Improve chrome performance
Navigate to chrome://flags.

# enable these:
Enable experimental canvas features
Override software rendering list - canceled
Number of raster threads - 4
Enable GPU rasterization
Enable zero-copy rasterizer
Simple Cache for HTTP
Disable touch adjustment
Enable TCP Fast Open
LCD text antialiasing
Enable Download Resumption

# disable these:
Enable touch events
Enable pinch scale

# startup parameters
Exec=chromium-browser --process-per-site --disk-cache-size=1073741824 %U

Firefox & Chromium profile
# see http://ubuntuforums.org/showthread.php?t=1921800&page=2
# see https://wiki.archlinux.org/index.php/Profile-sync-daemon
# see also https://wiki.archlinux.org/index.php/Anything-sync-daemon
sudo add-apt-repository ppa:graysky/utils
sudo apt-get update
sudo apt-get install profile-sync-daemon
psd p -> creates /********/.config/psd/psd.conf
# primary configuration
gedit /********/.config/psd/psd.conf
USERS="*** *******"
USE_OVERLAYFS="yes"
BROWSERS="chromium"
USE_BACKUPS="yes"
# Add to /etc/sudoers (required by psd.service USE_OVERLAYFS="yes"):
*** ALL=(ALL) NOPASSWD: /usr/bin/psd-overlay-helper
# secondary configuration
mkdir -p ~/.config/systemd/user/psd-resync.timer.d
gedit ~/.config/systemd/user/psd-resync.timer.d/frequency.conf
[Unit]
Description=Timer for Profile-sync-daemon
PartOf=psd.service
[Timer]
OnUnitActiveSec=10m
# Enable & start the service:
systemctl --user enable /usr/lib/systemd/user/psd.service
systemctl --user start psd
# Stop & disable the service
systemctl --user stop psd
systemctl --user disable psd
# check psd installation & configuration
profile-sync-daemon parse
psd p
ls -l ~/.mozilla/firefox/
ls -l /run/user/`id -u`

Plex
Server -> Transcoder: /var/tmp/plex-transcoding

Linux hdd defragmentation
# see http://www.hecticgeek.com/2012/10/defragment-ext4-file-systems-using-e4defrag-ubuntu/

HDD performance
# see https://www.kernel.org/doc/Documentation/block/queue-sysfs.txt
# see also https://wiki.mikejung.biz/Ubuntu_Performance_Tuning
# hdd performance info
echo "queue_depth: $(cat /sys/block/sda/device/queue_depth)"; echo "nr_requests: $(cat /sys/block/sda/queue/nr_requests)"; echo "read_ahead_kb: $(cat /sys/block/sda/queue/read_ahead_kb)"
echo "queue_depth: $(cat /sys/block/sdb/device/queue_depth)"; echo "nr_requests: $(cat /sys/block/sdb/queue/nr_requests)"; echo "read_ahead_kb: $(cat /sys/block/sdb/queue/read_ahead_kb)"

# queue_depth (default 31)
cat /sys/block/sda/device/queue_depth
cat /sys/block/sdb/device/queue_depth

# I/O scheduler queue size (default 128)
# How many requests may be allocated in the block layer for read or write requests.
cat /sys/block/sda/queue/nr_requests
su	-> won't work using sudo ...
echo 1024 > /sys/block/sda/queue/nr_requests

cat /sys/block/sdb/queue/nr_requests
su
echo 1024 > /sys/block/sdb/queue/nr_requests

# Maximum number of kilobytes to read-ahead
cat /sys/block/sda/queue/read_ahead_kb	-> default 128
sudo blockdev --getra /dev/sda		-> default 256
sudo blockdev --setra 128 /dev/sda

cat /sys/block/sda/queue/read_ahead_kb
sudo blockdev --getra /dev/sdb
sudo blockdev --setra 256 /dev/sdb

# persist using /etc/rc.local
blockdev --setra 128 /dev/sda
echo 0 > /sys/block/sda/queue/add_random

Disable IPv6 support
# check ipv6 status (1 = disabled)
cat /proc/sys/net/ipv6/conf/all/disable_ipv6
# add to /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1
# disable loading of ivp6 module into kernel during booting
# see http://linuxpoison.blogspot.com/2009/06/how-to-disable-loading-of-unnecessary.html
# edit /etc/modprobe.d/blacklist.conf
blacklist ipv6

/etc/sysctl.conf
vm.swappiness=1
# This option controls the tendency of the kernel to reclaim the memory which is used for caching of directory and inode objects.
# At the default value of vfs_cache_pressure=100 the kernel will attempt to reclaim dentries and inodes at a "fair" rate with respect to pagecache and swapcache reclaim. Decreasing vfs_cache_pressure causes the kernel to prefer to retain dentry and inode caches. When vfs_cache_pressure=0, the kernel will never reclaim dentries and inodes due to memory pressure and this can easily lead to out-of-memory conditions. Increasing vfs_cache_pressure beyond 100 causes the kernel to prefer to reclaim dentries and inodes.
vm.vfs_cache_pressure=5
	# Stolen from https://adrhc.go.ro/wordpress/ thanks man !!!!!

	See also
	# https://doc.ubuntu-fr.org/optimisation

	Check ubuntu startup times
	systemd-analyze blame

	/etc/fstab
	# http://www.lgqyc.com/move-tmp-to-ram/
	# http://jsmylinux.no-ip.org/performance/improving-performance/
	# http://askubuntu.com/questions/173094/how-can-i-use-ram-storage-for-the-tmp-directory-and-how-to-set-a-maximum-amount
	# http://www.digitalinternals.com/unix/linux-io-performance-tuning-noatime-nodiratime-relatime/388/
	#
	# mount \| grep -P "^tmpfs.+/(tmp\|var/run)"
	# sudo du -sh /tmp /var/tmp; du -sh /******/apps/tmp /******/apps/var/run /run/user/`id -u` /tmp/tomcat 2>/dev/null
	#
	tmpfs /tmp tmpfs defaults,relatime,mode=1777,size=4G 0 0
	tmpfs /var/tmp tmpfs defaults,relatime,mode=1777,size=99G 0 0
	tmpfs /********/apps/tmp tmpfs defaults,relatime,mode=1777,size=2G 0 0
	tmpfs /********/apps/run tmpfs rw,nosuid,noexec,relatime,mode=755,size=2G 0 0

	Firefox cache
	# see http://kb.mozillazine.org/Browser.cache.memory.capacity
	# see https://wiki.archlinux.org/index.php/Firefox_on_RAM
	# Main disadvantages of this method are that the content of currently browsed web pages is lost if browser
	# crashes or after a reboot, and that the settings need to be configured for each user individually.
	Open the url: about:config.
	browser.cache.disk.enable false
	browser.cache.disk.capacity 512000 -> 500M
	browser.cache.memory.max_entry_size 512000 -> 500M appcache
	browser.cache.memory.enable true
	browser.cache.memory.capacity 1048576 -> 1G RAM
	See the result in about:cache?device=memory (might require a firefox restart).

	Increase the Speed at Which Firefox loads pages
	# see also:
	http://bgr.com/2009/01/25/a-handful-of-firefox-tweaks-that-will-double-your-browser-speed/
	http://www.techfragments.com/481/the-12-best-firefox-aboutconfig-performance-tweaks/

	1. Type “about:config” into the address bar and hit Enter.
	(Normally the browser will make one request to a web page at a time. When you enable pipelining it will make several at once, which really speeds up page loading.)

	2. Alter the entries as follows:
	Set “network.http.pipelining” to “true”
	Set "network.http.pipelining.ssl” to “true”
	see also network.http.proxy.pipelining
	network.http.pipelining.maxrequests -> default 32; modified to 6
	content.notify.ontimer -> created with value true (default anyway)
	content.notify.backoffcount -> created with value 3 (default -1)
	content.notify.interval -> default 120 000 microseconds; modified to 500 000

	Chromium cache
	# see https://wiki.archlinux.org/index.php/Chromium/Tips_and_tricks#Tmpfs
	# Chromium with 1G RAM cache; modify in any chromium-browser.desktop (Exec=chromium-browser lines):
	chromium-browser --disk-cache-size=1073741824 --disk-cache-dir=/tmp/chromium-cache ...

	Improve chrome performance
	Navigate to chrome://flags.

	# enable these:
	Enable experimental canvas features
	Override software rendering list - canceled
	Number of raster threads - 4
	Enable GPU rasterization
	Enable zero-copy rasterizer
	Simple Cache for HTTP
	Disable touch adjustment
	Enable TCP Fast Open
	LCD text antialiasing
	Enable Download Resumption

	# disable these:
	Enable touch events
	Enable pinch scale

	# startup parameters
	Exec=chromium-browser --process-per-site --disk-cache-size=1073741824 %U

	Firefox & Chromium profile
	# see http://ubuntuforums.org/showthread.php?t=1921800&page=2
	# see https://wiki.archlinux.org/index.php/Profile-sync-daemon
	# see also https://wiki.archlinux.org/index.php/Anything-sync-daemon
	sudo add-apt-repository ppa:graysky/utils
	sudo apt-get update
	sudo apt-get install profile-sync-daemon
	psd p -> creates /********/.config/psd/psd.conf
	# primary configuration
	gedit /********/.config/psd/psd.conf
	USERS="* *****"
	USE_OVERLAYFS="yes"
	BROWSERS="chromium"
	USE_BACKUPS="yes"
	# Add to /etc/sudoers (required by psd.service USE_OVERLAYFS="yes"):
	*** ALL=(ALL) NOPASSWD: /usr/bin/psd-overlay-helper
	# secondary configuration
	mkdir -p ~/.config/systemd/user/psd-resync.timer.d
	gedit ~/.config/systemd/user/psd-resync.timer.d/frequency.conf
	[Unit]
	Description=Timer for Profile-sync-daemon
	PartOf=psd.service
	[Timer]
	OnUnitActiveSec=10m
	# Enable & start the service:
	systemctl --user enable /usr/lib/systemd/user/psd.service
	systemctl --user start psd
	# Stop & disable the service
	systemctl --user stop psd
	systemctl --user disable psd
	# check psd installation & configuration
	profile-sync-daemon parse
	psd p
	ls -l ~/.mozilla/firefox/
	ls -l /run/user/`id -u`

	Plex
	Server -> Transcoder: /var/tmp/plex-transcoding

	Linux hdd defragmentation
	# see http://www.hecticgeek.com/2012/10/defragment-ext4-file-systems-using-e4defrag-ubuntu/

	HDD performance
	# see https://www.kernel.org/doc/Documentation/block/queue-sysfs.txt
	# see also https://wiki.mikejung.biz/Ubuntu_Performance_Tuning
	# hdd performance info
	echo "queue_depth: $(cat /sys/block/sda/device/queue_depth)"; echo "nr_requests: $(cat /sys/block/sda/queue/nr_requests)"; echo "read_ahead_kb: $(cat /sys/block/sda/queue/read_ahead_kb)"
	echo "queue_depth: $(cat /sys/block/sdb/device/queue_depth)"; echo "nr_requests: $(cat /sys/block/sdb/queue/nr_requests)"; echo "read_ahead_kb: $(cat /sys/block/sdb/queue/read_ahead_kb)"

	# queue_depth (default 31)
	cat /sys/block/sda/device/queue_depth
	cat /sys/block/sdb/device/queue_depth

	# I/O scheduler queue size (default 128)
	# How many requests may be allocated in the block layer for read or write requests.
	cat /sys/block/sda/queue/nr_requests
	su -> won't work using sudo ...
	echo 1024 > /sys/block/sda/queue/nr_requests

	cat /sys/block/sdb/queue/nr_requests
	su
	echo 1024 > /sys/block/sdb/queue/nr_requests

	# Maximum number of kilobytes to read-ahead
	cat /sys/block/sda/queue/read_ahead_kb -> default 128
	sudo blockdev --getra /dev/sda -> default 256
	sudo blockdev --setra 128 /dev/sda

	cat /sys/block/sda/queue/read_ahead_kb
	sudo blockdev --getra /dev/sdb
	sudo blockdev --setra 256 /dev/sdb

	# persist using /etc/rc.local
	blockdev --setra 128 /dev/sda
	echo 0 > /sys/block/sda/queue/add_random

	Disable IPv6 support
	# check ipv6 status (1 = disabled)
	cat /proc/sys/net/ipv6/conf/all/disable_ipv6
	# add to /etc/sysctl.conf
	net.ipv6.conf.all.disable_ipv6=1
	net.ipv6.conf.default.disable_ipv6=1
	net.ipv6.conf.lo.disable_ipv6=1
	# disable loading of ivp6 module into kernel during booting
	# see http://linuxpoison.blogspot.com/2009/06/how-to-disable-loading-of-unnecessary.html
	# edit /etc/modprobe.d/blacklist.conf
	blacklist ipv6

	/etc/sysctl.conf
	vm.swappiness=1
	# This option controls the tendency of the kernel to reclaim the memory which is used for caching of directory and inode objects.
	# At the default value of vfs_cache_pressure=100 the kernel will attempt to reclaim dentries and inodes at a "fair" rate with respect to pagecache and swapcache reclaim. Decreasing vfs_cache_pressure causes the kernel to prefer to retain dentry and inode caches. When vfs_cache_pressure=0, the kernel will never reclaim dentries and inodes due to memory pressure and this can easily lead to out-of-memory conditions. Increasing vfs_cache_pressure beyond 100 causes the kernel to prefer to reclaim dentries and inodes.
	vm.vfs_cache_pressure=5