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Motivated by this report regarding fastest boot up time , I am curious to know these numbers i.e time elapsed from boot loader to shell, on my Ubuntu 12.04 running on a Atom processor. How do I look at these numbers.

I tried to find these timing information in log file but it is some thing like this :

/acme# nano /var/log/boot.log
fsck from util-linux 2.20.1
/dev/loop0: clean, 173695/1119232 files, 3426100/8953856 blocks
 * Starting Uncomplicated firewall^[[74G[ OK ]
 * Starting mDNS/DNS-SD daemon^[[74G[ OK ]
 * Starting configure network device security^[[74G[ OK ]
 * Starting configure network device security^[[74G[ OK ]
 * Starting bluetooth daemon^[[74G[ OK ]
 * Starting configure network device^[[74G[ OK ]
 * Starting Mount network filesystems^[[74G[ OK ]
 * Starting Upstart job to start rpcbind on boot only^[[74G[ OK ]
 * Starting Failsafe Boot Delay^[[74G[ OK ]
 * Stopping Upstart job to start rpcbind on boot only^[[74G[ OK ]
 * Starting Userspace bootsplash^[[74G[ OK ]
 * Starting Send an event to indicate plymouth is up^[[74G[ OK ]
 * Stopping Mount network filesystems^[[74G[ OK ]
 * Starting Bridge socket events into upstart^[[74G[ OK ]
 * Starting configure network device^[[74G[ OK ]
 * Stopping Failsafe Boot Delay^[[74G[ OK ]
 * Starting RPC portmapper replacement^[[74G[ OK ]

As you can see no timing information is presented. What command/file should be used then to get timings at various events?

share|improve this question
    
What do you mean by "from boot loader to shell". Which shell? –  Radu Rădeanu Nov 4 '13 at 11:43
    
Try using : <code>last -x | grep reboot</code> –  Invoker Nov 4 '13 at 11:48
    
I put the missing link. Please have a loot at it. –  gpuguy Nov 4 '13 at 11:52
    
This gives: reboot system boot 3.8.0-29-generic Mon Nov 4 06:47 - 06:52 (00:04) . Also if you look at the log messages given in the link (I added now), you would understand what I am looking for –  gpuguy Nov 4 '13 at 11:55
    
@RaduRădeanu My shell is bash –  gpuguy Nov 4 '13 at 12:10
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