On 09/10/2012 02:49 PM, Martin Bochnig wrote: > I know, But on everything starting at 1GHz it is not that bad. > The reason was: Of course I'm aware of the smaller compression ratios. > But then DualLayer would be a requirement. > If you like and if time allows, I can offer two versions of that ISO. > One for DualLayer Media (with gzip-5) and the other for usual 4.7 GB > (4.4GB) media.
Contrary to popular belief, the -[1-9] switch to gzip doesn't influence compression ratio all that much. Here are my tests with the silesia corpus: $ time gzip -1 -c < silesia.tar > silesia-1.tar.gz user 0m43.004s ratio 63.5% $ time gzip -3 -c < silesia.tar > silesia-3.tar.gz user 0m52.029s ratio 65.5% $ time gzip -5 -c < silesia.tar > silesia-5.tar.gz user 1m9.355s ratio 67.4% $ time gzip -6 -c < silesia.tar > silesia-6.tar.gz user 1m29.819s ratio 67.9% $ time gzip -9 -c < silesia.tar > silesia-9.tar.gz user 3m16.998s ratio 68.1% I hardly think the 2.5% difference in compression ratio is going to push you over the single-layer limit. By a first-degree approximation, 10GB will roughly compress like this: gzip -1: 3.64 GB gzip -3: 3.45 GB gzip -5: 3.26 GB gzip -6: 3.21 GB gzip -9: 3.19 GB So save yourself a ton of time and use something between gzip -3 or gzip -5. Anything higher than that is placebo. Cheers, -- Saso _______________________________________________ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss