mrry (Happy New Year)
Blog Computing Science - Grid Computing (M) 13/May/2005

Let me start by saying how much I love Grid Computing. As a field, I think it is immensely promising, and I intend to dedicate at least the next year to furthering its aims. Why, then, should a Grid Computing exam present, as Gary put it, a scalable and heterogeneous fear?

Perhaps because it had never been examined before and we had no idea what to expect (other than a 100-mark-in-105-minutes-brutalising). Perhaps because the size of the course is best measured in the same terms as one might measure a horse. Perhaps because the software upon which is predicated—Globus—is so bad as to guarantee a knowing laugh from anybody who's ever used it. Perhaps because it drove Gary to drink.

There were probably other reasons, too. It was thus that Gary, Stu and I (and some other people) strolled into the exam hall today to meet our collective nemesis.

Question 1, for fifty marks. Virtual Organisations, Authentication (via Public Key Infrastructures), and Authentication (via PERMIS). That was rather more than I wanted to see on Virtual Organisations, whose description I could barely remember as I sat down to the paper, but there was at least a reasonable overlap between the security material and that which was in the sample exam.

Question 2, for fifty marks. The third pillar of OGSA, known to its friends as Data Management. This was a more bitty question than the previous, split into six parts. "List" is a good exam term, so is "describe the steps". The parts seemed to talk in general about Data Management, in particular about OGSA-DAI, and there was a cheeky seven-marker about provenance, which I'm not sure anyone truly appreciates (I certainly didn't). Also was there a rather specific question about the life sciences, which I didn't much like, but hopefully the life sciences community face much the same problems as anyone else using the Grid.

Question 3, for another fifty. When you sit as many exams as we do, you develop tactics for deciding which questions to answer and which to skip. Whilst it might not be possible to explain it, this was one of the questions always destined to be skipped. I don't think anybody's solved the problem of scheduling on the Grid, and I was damned if I was going to do it in fifty minutes this afternoon.

Anyway, it's pleasing to be on the other side of that exams. Only five more to go, starting with Security and Cryptography next week. So that gives you something to which to look forward over the weekend!




Neil said:
Yeah, Ronny P's sac is my favourite! Shame about the salt though.

e-wing said:
Just to be topical the register is running an article about whether grid computing is a real world solution...

P.s. we all know that neil likes some hard Ronny P.

Derek said:
Unfortunately, it looks like you and I both prefer being savagely brutalised to finishing early :/. I could continue the metaphor, but it might get a bit controversial.

And you're spot on with the spam-fighting notice. I spotted the link about wiki spam in your feed, and thought I'd have a bash. But I'm not sure that it's worked yet: that remains to be seen!

Gary Fleming said:
Mark: You may finish first, but you do have 5 in a row. I know what I prefer. :P

Derek: I see you've adopted a new spam fighting technique. Good work!

Cabumbo said:
Word on teh street says that Grid was well easy and it was just Derek, Gary and Stu that found it even in teh least bit hard. Personally i think Saftey Critical Systems is much more challenging...

Whats there not to get about the grid. You submit jobs to it giving it an estimated time for the job to complete and then boom a little while llater after it has run its awful scehuling algorithm you get your job done and your results back. Easy!

As for shceduling i would use a simple round robin FIFO LIFO combo with extra head of line blocking removal capabilities that ensure fair queuing.

I just look forward to Friday when i am finished and you guys are not :p

Take it easy and i will see you monday for, as Neil once said, " Some hard Ronny P."





Please enter the number 3882 in the box below:

CommentsTell a friend about this page

Your Name

Your E-Mail

Your friend's E-Mail


< # Scottish Blogs ? >
Technorati Profile
Listed on BlogShares

Subscribe to the mrry RSS feed
More about RSS.
Trackback URL for this article: