Before revision:  However, for emerging datacenter computing (in short, DC)  workloads, such as internet services or big data analytics, previous work reports on the modern CPU architecture that the average proportion of floating-point instructions only takes 1\% and the average FLOPS efficiency is only 0.1\%, while the average CPU utilization is high as 63\%. These contradicting performance numbers imply that FLOPS is inappropriate for evaluating DC computer systems.
After revision:  However, for emerging datacenter computing (in short, DC) workloads, such as internet services or big data analytics, previous work reports on the modern CPU architecture that the average proportion of floating-point instructions only takes 1\% and the average FLOPS efficiency is only 0.1\%, while the average IPC is 1.3 (the theoretic IPC is 4 on the Intel Xeon E5600 platform). Furthermore, we reveal that the traditional FLOPS based Roofline performance model is not suitable for modern DC workloads, and gives misleading information for system optimization. These observations imply that FLOPS is inappropriate for evaluating DC computer systems.