Measuring boot time

kushalkoolwal · 03-19-2009, 03:01 PM

I am using a simple plain Debian Lenny base system (No X). I would like to measure how many seconds my system takes to boot - time between hitting enter key on GRUB screen to login console on tty1.

One obvious way is to measure it manually by looking at your wrist watch or an external timer but I would to measure it more accurately - something that is built inside the Operating System.

Thanks

Maligree · 03-19-2009, 03:03 PM

Bootchart.

pljvaldez · 03-19-2009, 03:03 PM

http://www.debian-administration.org/articles/620

kushalkoolwal · 03-19-2009, 03:09 PM

Quote:

Originally Posted by Maligree

Bootchart.

Yeah I looked at it. It is very feature-rich and you can do a lot of things with bootchart. However I need something very very simple which can tell me "xx" seconds were required to boot. Also with bootchart I am assuming that it might be introducing some overheads of its own.

What about the printk times?

Code:

<snip>
[    7.433922] sr0: scsi3-mmc drive: 32x/32x writer dvd-ram cd/rw xa/form2 cdda tray
[    7.433925] Uniform CD-ROM driver Revision: 3.20
[    7.433998] sr 0:0:0:0: Attached scsi CD-ROM sr0
[    7.434184] sr 0:0:0:0: Attached scsi generic sg0 type 5
[    7.564620] loop: module loaded
[   10.585483] floppy0: no floppy controllers found
[   12.313928] e100: eth1: e100_watchdog: link up, 100Mbps, half-duplex
[   12.345929] e100: eth0: e100_watchdog: link up, 100Mbps, full-duplex
debian:~#

kushalkoolwal · 03-19-2009, 03:11 PM

Quote:

Originally Posted by pljvaldez

http://www.debian-administration.org/articles/620

Thanks for the article link.

I didn't read the entire article but doesn't that talks more about how to "improve" the boot time. I am just looking to measure the boot time.

EDIT: It seems that article does mention bootchart somewhere.