How to examine performance bottlenecks?

[John Arbash Meinel]

Jari Aalto wrote:
> Is there a wiki page that lists how to study the performance
> bottlenecks? 
> 
> See this: (1.0.0 / Cygwin):
> 
>     $ time bzr --version
>     real    0m16.830s
>     user    0m2.673s
>     sys     0m8.091s
> 
>     $ time bzr --help
>     real    0m12.185s
>     user    0m1.932s
>     sys     0m5.988s
> 
>     $ time python -c 'import bzrlib'
> 
>     real    0m5.172s
>     user    0m1.101s
>     sys     0m2.253s
> 
>     $ time bzr init
> 
>     real    0m18.170s
>     user    0m2.884s
>     sys     0m8.522s
> 
> Compared to Mercurial 0.9.5
> 
>     $ time hg --version
> 
>     real    0m3.536s
>     user    0m0.490s
>     sys     0m1.762s
> 
>     $ time hg --help
> 
>     real    0m3.486s
>     user    0m0.560s
>     sys     0m1.752s
> 
>     $ time hg init
> 
>     real    0m3.516s
>     user    0m0.660s
>     sys     0m1.702s
> 
> Jari
> 

If you are running from source, you can use:

bzr --profile-imports COMMAND

John
=:->