Bug#810898: apt: "apt-get update" (1.2) very slow with compressed indices and debtags

[Enrico Rossi]

Hi,

Enrico Zini made this python3 code to test the problem outside debtags:

#!/usr/bin/python3
import apt

def main():
    cache = apt.Cache()
    for pkg in cache:
        cand = pkg.candidate
        if not cand: continue
        tags = cand.record.get("Tag", None)
        if not tags: continue
        print(pkg.name, tags)

if __name__ == "__main__":
    main()

Running it without compressed index in apt:

# time python3 cattags >/dev/null 
real    0m1.671s
user    0m1.539s
sys     0m0.132s

with compressed index:

# time python3 cattags >/dev/null 
real    1m44.238s
user    1m33.536s
sys     0m10.698s

I'm going to re-assign the bug to python-apt, maybe they have more info
on the issue.

Bye
E.

-- 
GPG key: 4096R/5E0195FAF2133176 2010-10-19 Enrico Rossi <e.ro...@tecnobrain.com>