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One thing a lot of people have seen with Amazon is high instance to instance variation. Generally if one starts up a batch job of 10-100 odd instances all doing
by jasonwatkinspdx 17y ago
One thing a lot of people have seen with Amazon is high instance to instance variation. Generally if one starts up a batch job of 10-100 odd instances all doing the same work, you'll see up to a 10x difference in throughput between best and worst instances.
I'd speculate amazon has many different generations of hardware deployed and the EC2 Compute Units do not really capture the differences between these, particularly when it comes to memory bandwidth.
- uggedal 17y agoAs a matter of fact I ran the benchmarks on one instance in EU and one in US before I started a week long run on one US instance. I simply could not believe the numbers I was getting from what should be a larger share of physical CPUs compared to the other providers and many times more RAM.
- lsc 17y agoI think you might want to go back and run a web application benchmark like you did last time; the benchmarks you used this time apparently do not benefit from having more ram, and this is, uh, rather different from most (but not all) real-world loads.