After I switch my blog to Octopress, I realize that compare with the Google App Engine, the Github gh-pages hosting service is much slower (10 times compare with GAE ping value, 6xxms vs 6xms)
So I believe it’s better to hosting the static blog file to GAE, switch to GAE also enable server side script as a bonus if you didn’t care about portable, which is the most reason I using Octopress.
After creating GAE required app.yaml file, using
appcfg.py update . to upload your Octopress blog to GAE, yes, certianly you also need install GAE SDK first and apply a GAE account.