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Re: Bug#622322: popularity-contest: popcon tries to access dpkg internal files and fails with multiarch: same packageso

On Sun, 08 May 2011, Bill Allombert wrote:
> > Thanks, seems to work fine, I have no error/warning at least.
> > 
> > batch of 1 pkg: 3m10.789s
> > batch of 2 pkgs: 0m21.769s
> > batch of 3 pkgs: 0m6.362s
> > batch of 4 pkgs: 0m4.763s
> > batch of 5 pkgs: 0m4.714s
> > batch of 10 pkgs: 0m4.670s
> > Direct access: 0m4.637s
> OK, so you get comparable results. It is very odd that there so much a difference between
> batch of 1 package and batch of 2 packages. Maybe this is a dpkg issue ?

Actually it's a bug in your script... replace "length @pkglist"
with "scalar @pkglist" and you'll get entirely different results...
which are much more logical.

batch of 5: 0m37.426s
batch of 10: 0m20.974s
batch of 50: 0m7.722s
batch of 200: 0m5.090s
batch of 1000: 0m4.437s

> Also, how does dpkg -L handles the dpkg lock ?

It doesn't take the lock because it's a readonly operation.

Raphaël Hertzog ◈ Debian Developer

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