> > This would seem to implicate the line id2name[id] = name as being
excruciatingly slow.
>
> As others have pointed out there is no way that this takes 45
> minutes.Must be something with your system or setup.
>
> A functionally equivalent code for me runs in about 49 seconds!
> (it ends up using about twice as much ram as the data on disk)
You can download the list of keys from here, it's 43M gzipped:
http://www.sendspace.com/file/9530i7
and see it take about 45 minutes with this:
$ cat cache-keys.py
#!/usr/bin/python
v = {}
for line in open('keys.txt'):
v[long(line.strip())] = True
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