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系统结构学习中容易弄错的问题2

(2011-06-16 07:31:28)
标签:

计算机系统结构

功耗

使用率

it

教育

分类: 摘抄篇

Fallacy 1: Computers at low utilization use little power.

Power efficiency matters at low utilizations because server workloads vary. CPU utilization for servers at Google, for example, is between 10% and 50% most of the time and at 100% less than 1% of the time. Figure 1 shows power for servers with the best SPECpower results at 100% load, 50% load, 10% load, and idle. Even servers that are only 10% utilized burn about two-third of their peak power.

Server Manufacture

Micro-

Processor

Total

Cores/

Sockets

Clock

Rate

Peak

Performance

(ssj_ops)

100%

Load

Power

50%

Load

Power

50%

Load/

100%

Power

10%

Load

Power

10%

Load/

100%

Power

Active

Idle

Power

Active

Idle/

100%

Power

HP

Xeon E5440

8/2

3.0GHz

308.022

269W

227W

84%

174W

65%

160W

59%

Dell

Xeon E5440

8/2

2.8GHz

305.413

276W

230W

83%

173W

63%

157W

57%

Fujitsu Seimens

Xeon X3220

4/1

2.4GHz

143.742

132W

110W

83%

85W

65%

80W

60%

 

Since servers’ workload vary but use a large fraction of peak power, Luiz Barroso and Urs Holzle argue that we should redesign hardware to achieve “energy-proportional computing.” If future severs used, say, 10% of peak power at 10% workload, we could reduce the electricity bill of datacenters and become good corporate citizens in an era of increasing concern about CO2 emissions.

- From “Computer Organization and Design – The Hardware/software Interface

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