Fedora 20 Beta vs. Ubuntu 13.10 vs. Scientific Linux 6.4
In some of the other CPU-focused workloads, Ubuntu 13.10 and Fedora 19/20 were slower than the mature Scientific Linux 6.4 release.
The results were mixed a lot depending upon the particular workload, but more results for your viewing pleasure are available from the OpenBenchmarking.org result file. For more enterprise Linux comparisons, see my recent 5-way Linux comparison in Amazon's EC2 Cloud.
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