questions regarding profilers

[lehe <tim...@ya...>]

Hi,
I have some questions regarding these profilers:

1. Is oprofile better than gprof in terms of helping optimizing code time
performance? Like checking branch misprediction, etc;

2. Why does oprofile require root while gprof doesn't? 
I am trying to use oprofile on a server, however I don't have access to
root, so here is what I get:
 
bash-3.2$ opcontrol --vmlinux=/boot/vmlinux-`uname -r`
Normal users are limited to '--dump'.
bash-3.2$ opcontrol --start
Normal users are limited to '--dump'.
bash-3.2$ opcontrol --dump
Unable to complete dump of oprofile data: is the oprofile daemon running?
bash-3.2$ opreport
opreport error: No sample file found: try running opcontrol --dump
or specify a session containing sample files
 
It seems to tell me I can use dump only, but actually I cannot even start.
Is it no way to use oprofile if I am not root?
Would it help if I am able to install my oprofile under my $HOME?

Thanks!
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