e4rat - reduce boot time (into X) by some 50% for ext4

lilsirecho · 2011-04-06 20:01:03

KlavKalashj wrote:

lilsirecho wrote:
x86_64 compatible?
Works fine here on x86_64. Using KDE, it was a noticeable difference, I didn't use bootchart but I could feel it. KDM and desktop loading was really fast.

I assume your 64bit is using ext4..................

toad · 2011-04-06 21:38:43

Spider.007 wrote:

Has anyone compared the stats with preload?

The wiki is somewhat opaque on what preload does but from what I gather there is no point in running the two concurrently.

toad · 2011-04-06 22:42:01

TigTex wrote:

When I upgrade my kernel and do some other major changes, do I have to re-run e4rat-collect and alloc manually?

Good question, taugenix (cool translation=isnogood) is the developer, so I'll pass that one on...

ngoonee wrote:

I wonder, systemd requires an init line and so does e4rat... how would I use both?

Hm, is it not possible to have two init lines? Mind, I haven't tried yet, have you?

hauzer wrote:

Yes, I f*cked up my system testing this. The 'conversion' goes fine, but e4rat still can't move the files and they somehow get corrupted. Now I have corrupt libc.so and whatnot.. Oh well.

Is it possible that one of your partitions was not ext4?

ngoonee · 2011-04-06 22:43:52

toad wrote:

ngoonee wrote:
I wonder, systemd requires an init line and so does e4rat... how would I use both?
Hm, is it not possible to have two init lines? Mind, I haven't tried yet, have you?

Have not tried with e4rat, but I recall when I was trying out systemd I couldn't do two init lines for bootchart at the same time, though.

falconindy · 2011-04-06 23:49:44

ngoonee wrote:

toad wrote:
ngoonee wrote:
I wonder, systemd requires an init line and so does e4rat... how would I use both?
Hm, is it not possible to have two init lines? Mind, I haven't tried yet, have you?
Have not tried with e4rat, but I recall when I was trying out systemd I couldn't do two init lines for bootchart at the same time, though.

Solution: make a unit for e4rat, or modify the script that it calls to bootstrap init.

e4rat has a config file which lets you specify init. it defaults to /sbin/init.

Last edited by falconindy (2011-04-07 01:37:39)

Kosava · 2011-04-07 00:42:36

I dont understend well, where i need to put this line init=/usr/sbin/e4rat-collect

in /boot/grub/menu.lst

Sorry i'm not well expirienced in this but i want to trie this...

thanks.

karol · 2011-04-07 00:49:25

Kosava wrote:

I dont understend well, where i need to put this line init=/usr/sbin/e4rat-collect
in /boot/grub/menu.lst
Sorry i'm not well expirienced in this but i want to trie this...
thanks.

Append it to the kernel line, like this

kernel /vmlinuz26 root=/dev/disk/by-uuid/bf1d191b-0f0d-4961-bd67-4d023a2e5873 ro init=/usr/sbin/e4rat-collect

Kosava · 2011-04-07 09:39:27

@Karol thanks now i tried and it work.

toad · 2011-04-07 09:41:56

@ ngnoonee

I updated the wiki, check here: https://wiki.archlinux.org/index.php/E4rat#Bootchart

ngoonee · 2011-04-07 10:06:55

toad wrote:

@ ngnoonee
I updated the wiki, check here: https://wiki.archlinux.org/index.php/E4rat#Bootchart

Thanks toad

eworm · 2011-04-07 11:15:53

I've added a note about e4rat and systemd to the wiki. I do not have ext4, so I can not try myself... Hope it's correct.

radiomist · 2011-04-07 15:38:49

systemd crash o,o and boot procces take infinit time

toad · 2011-04-07 19:58:24

The bootchart option I put in the wiki to keep logging after ?dm starts doesn't appear to be working. I've written to the devs after google wasn't forthcoming either. The bootchart wiki talks about an rc.sysinit setup but it appears to be rather cumbersome (I would much prefer a number of different grub entries...).

Anyway, there were questions re major upgrades and e4rat compatibility. Here my experience:
After the recent KDE upgrade to 4.6.2-1 KDE started fine but I had a number of problems (kde4d eating CPU, keyboard switcher did not function on window or application but only on global level). To get rid of these I had to collect and reallocate anew.

@radiomist, have you seen this https://wiki.archlinux.org/index.php/E4 … nit_system ?
Just checking 'cos the wiki is changing by the minute

eDio · 2011-04-07 21:28:41

e4rat tries to read startup.log from /var golder. But I have /var on separate partition and it is not available on start. Are there any workarounds?

toad · 2011-04-07 21:47:46

deleted, too tired to think...

Last edited by toad (2011-04-07 22:23:40)

Cody · 2011-04-07 22:07:17

When I boot with the e4rat-preload init line I get this kernel panic.

radiomist · 2011-04-08 02:11:26

toad wrote:

T
@radiomist, have you seen this https://wiki.archlinux.org/index.php/E4 … nit_system ?
Just checking 'cos the wiki is changing by the minute

i was fallowing the wiki, fixed with pacman -Syu

Wow!! takes about 10 seconds to get into KDE, another 10 seconds to get a full funcional desktop

Last edited by radiomist (2011-04-08 02:38:00)

hauzer · 2011-04-08 17:28:14

Cody wrote:

When I boot with the e4rat-preload init line I get this kernel panic.

Yeah, that's what happened to me too. Seems it isn't due to file systems but something in the system. I reinstalled Arch with all ext4 partitions and was going to give e4rat one more chance, but after seeing your post, I won't.

toad · 2011-04-08 17:30:03

Interesting. Cody, I reckon you have all ext4 partitions? If not, check your startup.log and see whether it contains any files which are not on ext4 partitions...

kokoko3k · 2011-04-08 17:51:04

fsckd wrote:

boot takes a few seconds longer
but processes load much faster
i suppose one would have to reallocate every now and then
as package updates would remove files already reallocated
edit: monthly cron job :-)

Yeah, everytime kde/gnome gets updated i think you need to "defrag" again.
It's not that bad after all, but why don't just use hibernation?
On recent kernels i've had no stability problems anymore, system is up and running very fast and snappy because of buffers/cache retention.
Is there something i'm not thinking about?

uc50ic4more · 2011-04-08 18:19:36

eDio wrote:

e4rat tries to read startup.log from /var golder. But I have /var on separate partition and it is not available on start. Are there any workarounds?

Move the log file?

Stebalien · 2011-04-08 20:10:24

eDio wrote:

e4rat tries to read startup.log from /var golder. But I have /var on separate partition and it is not available on start. Are there any workarounds?

--edit: Use the latest e4rat and edit the config. ignore -vv-
It's an ugly hack but this is what I did:
Boot into init 1 (recovery mode) and run:

/etc/rc.d/syslog-ng stop
cp /var/lib/e4rat/startup.log ~
umount /var/
mkdir /var/lib/e4rat/
cp ~/startup.log /var/lib/e4rat/startup.log
rm ~/startup.log
mount -a
reboot

In other words, put the startup log in the root filesystem underneath /var.

Last edited by Stebalien (2011-04-09 16:08:54)

MystX · 2011-04-09 00:42:37

Would this work if the /home partition was still Ext3?
I'm considering reinstalling arch on my netbook for this, but would rather not have to transfer everything in /home from, then to it - much easier to just not format /home in the setup..
That being said though, /home contains most of your config stuff.. which would be used on boot.
Anyone know if it would still work?

marvn · 2011-04-09 06:27:31

kokoko3k wrote:

fsckd wrote:
boot takes a few seconds longer
but processes load much faster
i suppose one would have to reallocate every now and then
as package updates would remove files already reallocated
edit: monthly cron job :-)
Yeah, everytime kde/gnome gets updated i think you need to "defrag" again.
It's not that bad after all, but why don't just use hibernation?
On recent kernels i've had no stability problems anymore, system is up and running very fast and snappy because of buffers/cache retention.
Is there something i'm not thinking about?

Dual boot

kokoko3k · 2011-04-09 11:22:23

@marvn:
I always remount my windows partition(s) and all /media/* in read only before hibernation. and it is very uncommon i need write access to the linux ones from windows, so no problem so far.

Arch Linux

#51 2011-04-06 20:01:03

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#52 2011-04-06 21:38:43

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#53 2011-04-06 22:42:01

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#54 2011-04-06 22:43:52

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#55 2011-04-06 23:49:44

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#56 2011-04-07 00:42:36

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#57 2011-04-07 00:49:25

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#58 2011-04-07 09:39:27

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#59 2011-04-07 09:41:56

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#60 2011-04-07 10:06:55

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#61 2011-04-07 11:15:53

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#62 2011-04-07 15:38:49

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#63 2011-04-07 19:58:24

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#64 2011-04-07 21:28:41

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#65 2011-04-07 21:47:46

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#66 2011-04-07 22:07:17

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#67 2011-04-08 02:11:26

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#68 2011-04-08 17:28:14

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#69 2011-04-08 17:30:03

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#70 2011-04-08 17:51:04

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#71 2011-04-08 18:19:36

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#72 2011-04-08 20:10:24

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#73 2011-04-09 00:42:37

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#74 2011-04-09 06:27:31

Re: e4rat - reduce boot time (into X) by some 50% for ext4

#75 2011-04-09 11:22:23

Re: e4rat - reduce boot time (into X) by some 50% for ext4

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