Re:When EC2 Hardware Changes Underneath You
by mjs on Wednesday January 09, 2013 @06:00AM
(#5031004)
I thought the "changing underneath" in the title was referring to "hot" VM migration too (i.e. no downtime, but different physical hardware, like http://wiki.xen.org/wiki/Migration) but I think it's a bit picky to object to the way it's used in this blog post, even if it's slightly confusing... What other short phrase would you use?
[ Parent
| on HN ]
Re:When EC2 Hardware Changes Underneath You
by xyzzy123 on Wednesday January 09, 2013 @09:40AM
(#5031678)
Fair enough, it is a bit misleading. I would say " 'instance type' equivalence is broken" rather than "hardware changes underneath".
So picloud stripes (simplifying; I imagine it's a pull model with some load balancing smarts) python "cloud" calls across a variety of instances they have warmed up, but there is an assumption that, say, arbitrary Cython code will work the same way between one m1 instance and another.
That turns out not to be the case. Some (say m1 for argument's sake) instances on Amazon are broken because they advertise the wrong CPU capabilities. So not all e.g. m1s are alike...