Difference between revisions of "How to optimize and accelerate your system"
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== Chrome Tweaks ==
== Chrome Tweaks ==
There are two steps to running Chrome completely in memory. To move the profile to memory, install profile
There are two steps to running Chrome completely in memory. To move the profile to memory, install profile-sync-daemon:
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Revision as of 02:22, 23 December 2012
Note: this was copied directly from http://forum.sabayon.org/viewtopic.php?f=57&t=19762&p=117865#p117865. Please refer to original for how it should be formatted
This is a guide to optimizing your Sabayon system. Except for Section 3.1, the tweaks here are independent of desktop environments and applications, so they can be applied to both KDE and GNOME.
OpenRC Boot Services in Parallel
We will start at the beginning with boot performance. This tweak will improve the initial boot performance before kdm/gdm is loaded.
Change rc_parallel="NO" to rc_parallel="YES" and rc_logger="YES" to rc_logger="NO". If rc_parallel is not in your rc.conf, then add rc_parallel="YES" at the end.
Disable Automatic Startup of Services
Some services are essential and should not be disabled, however, there are many that you are probably not using. To see what services are started automatically, run
To delete services, give rc-update the del argument, followed by the script and runlevel. For example, to remove file system support for RAID:
rc-update del mdadm default
Other services to consider disabling include
- lvm - logical volume management, which you may have used during install if you let the #installer automatically partition
- nfsmount - mounts network file systems
- sabayon-mce - media center service, associated with XBMC (not included with CoreCD)
Apply this tweak to systems with >2GB memory to reduce hard drive access. Append the following lines to turn off swap until memory runs out and to wait longer before writing dirty pages to disk:
vm.swappiness = 0 vm.dirty_background_ratio = 50 vm.dirty_ratio = 80
Because Sabayon is a binary distribution, linking optimization is done after compile. For this tweak to work, your CXXFLAGS in make.conf must not contain -fvisibility-inlines-hidden. This flag makes gcc avoid exporting unneeded symbols from libraries, making them smaller. Prelink is not in Sabayon repositories yet, so the proper procedure is to add prelink to /etc/entropy/packages/package.mask. Install prelink
Run the command to generate prelink configuration file
Prelink all binaries with
If you upgrade your libraries after prelinking, you need to run the above command again. Alternatively, automate the task:
Enable the daily cron task.
3.1 Speeding Up KDE After Prelinking
If you're running KDE, there is an extra step to disable kdeinit
ls /etc/env.d/ | grep kdepaths vim /etc/env.d/*kdepaths
Tune Hard Drive Performance
The hard drive is the slowest compenent of your computer. A little tuning goes a long way for performance.
Add the following at the bottom
hda_args="-a16 -c1 -k1 -u1 -S0" cdrom0_args="-c1 -k1 -u1"
Start hdparm during boot
rc-update add hdparm boot
Preload is an adaptive readahead daemon, that will monitor which programs you use most. Parts of these programs will be cached to speed up their load time.
equo install preload rc-update add preload default
Look Up Domain Names Faster
Every time your browser visits a new domain, it contacts a domain name server to fetch the ip address, and then loads the page from the address. Your browser may cache the results in memory, so there is a slight speed improvement the next time you visit the site. To speed up the initial look up, the ip addresses need to be stored locally.
equo install net-dns/host
#!/bin/bash HOST="$1" IP=$(host-woods "$1" | cut -f3 | head -1) ALIAS="$2"; echo "$IP" "$HOST" "$ALIAS" >> /etc/hosts
./addhost sabayonlinux.org ./addhost gentoo-portage.com gp
Now you can visit gentoo-portage by typing gp after restarting the network service.
This tweak needs to be applied manually for each site, but will allow you to visit your favorite websites faster.
Xorg handles your interactive session from output to display to input from keyboard and mouse. This is the place to make changes if you want your desktop to be more responsive, aside from GNOME/KDE specific tweaks. For experienced users, recompiling X11 after editing make.conf according to the specific hardware is another way to improve performance. This guide will focus on xorg.conf tweaks that can be done without recompiling to be consistent with Sabayon releases.
7.1 Keyboard Repeat Delay
Section "InputDevice" Identifier "idevname" Driver "kbd" Option "AutoRepeat" "250 10" EndSection
The default key repeat time 500 milliseconds, and the default key response time is 30 milliseconds. This sets them to 100 and 250, respectively. You can replace "idevname" with your name for your keyboard.
7.2 Intel Graphics Card Tweaks
Section "Device" ... Option "TripleBuffer" "true" Option "MigrationHeuristic" "greedy"
Changing MigrationHeuristic to greedy is recommended for normal desktop usage, but will decrease game-play performance.
7.3 Nvidia Graphics Card Tweaks
Section "Device" ... Option "NoLogo" "true" Option "CursorShadow" "true"
7.4 Ati Graphics Card Tweaks
Section "Device" ... Driver "fglrx"
Section "Module" ... Load "GLcore" Load "glx" Load "dri"
Ram Drive using tmpfs
Because temp folders are cleared during shutdown, it is safe to place their storage locations in RAM. This reduces the number of disk operations, making programs that use temp folders faster. Open the file and append the lines: file: /etc/fstab
... tmp /tmp tmpfs rw,mode=1777 0 0 vartmp /var/tmp tmpfs rw,mode=1777 0 0
"mode=1777" option allows all users write access, but prevents deletion of files belonging to other users.
wget -c http://web.archive.org/web/20090107044922/http://www.rubyringtechnologies.com/files/sysctl.conf.txt -O ~/sysctl.conf sed -i 's/\(net\.core\.hot_list_length\ =\ 256\)/\#\1/' ~/sysctl.conf cat < ~/sysctl.conf >> /etc/sysctl.conf
Run the following command to reload the config file:
Multicore Interrupt Balancing
This tweak should only be applied to multicore systems. Interrupts are used to inform the CPU of hardware events. When the hard drive finishes loading data, an interrupt is sent. When a key is hit, an interrupt is sent. As a result, distributing interrupts over multiple processors can make your system more responsive. Install irqbalance:
equo install irqbalance
To start it immediately:
Add it to the boot process to have it start with Sabayon:
rc-update add irqbalance default
There are two steps to running Chrome completely in memory. To move the browser profile to memory, install profile-sync-daemon:
Edit /etc/conf.d/psd and add your username, then add the daemon to the boot process:
rc-update add profile-sync-daemon default
The second step is to append the following launch flags to Chrome in the shortcut or launcher:
--disk-cache-dir=/tmp/cache --scroll-pixels=250 --disk-cache-size=629145600 --memory-model=high
The first flag sets the ram drive for cache. The second flag increases scrolling rate. The last two flags increases performance if you have more than 1G of free memory.
Experimental Chrome features can be enabled by typing about:flags in the address bar
- GPU compositing on all pages
- Threaded compositing
- Per-tile Painting
- Smooth Scrolling
- Enable auto-login
- HTTP Pipelining