Re: What CDs and DVDs should we produce for lenny?
On Wed, Mar 19, 2008 at 10:14:50AM +1300, Philip Charles wrote:
> Note the previous comments by some mirror masters, Jigdo loads their
> systems more than a normal download.
To be fair, Mattias and Attila are/were the admins of the _primary_ ISO
image mirrors. For a typical Debian package mirror, the performance
difference (of jigdo vs. also serving ISOs via HTTP) might not be so
pronounced, and the space savings might make up for the lower performance.
Also, right now there are 350 package mirrors, but only 144 ISO mirrors (of
which 132 also have packages [0]). More widespread use of jigdo would take
away the load from the ISO mirrors, both because people also use the
package mirrors to download ISOs, and because memory pressure is reduced on
the CD mirrors, as both ISO and package downloaders access the same files.
Finally, depending on the filesystem used it might be possible to optimize
the disk layout to reduce the number of seeks: Make copies of all the .deb
files required by a jigdo-based ISO download, and only delete the originals
after the last copy has been made. That way, if the filesystem is not too
fragmented, it is likely that the copies will be adjacent to each other on
the disk now.
Cheers,
Richard
[0]
gawk '/^Archive-(ht|f)tp/{a=1} /^CDImage-(ht|f)tp/{c=1} /^$|^Comment/{aa+=a;cc+=c;b+=a*c;a=c=0} END{printf("%d package mirrors, %d iso mirrors, %d both\n",aa,cc,b)}' Mirrors.masterlist
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