我在备份上测试了我的系统，发现在备份上运行时性能明显下降。结果如下：
配置：
- CPU：2.0 Ghz，6 核，12 线程
- 内存：16 GB
- 不间断电源：600W/1000VA
- PSU：460W 黄金效率
- 操作系统：Ubuntu 12.04.3
- 软件：sysbench
*) 主电源开启
andra@Ajax-Alpha:~$ sysbench --test=cpu --cpu-max-prime=100000 --num-threads=12 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 12
Doing CPU performance benchmark
Threads started!
Done.
Maximum prime number checked in CPU test: 100000
Test execution summary:
total time: 32.4046s
total number of events: 10000
total time taken by event execution: 388.4964
per-request statistics:
min: 33.81ms
avg: 38.85ms
max: 50.79ms
approx. 95 percentile: 38.88ms
Threads fairness:
events (avg/stddev): 833.3333/1.18
execution time (avg/stddev): 32.3747/0.01
*) 主电源关闭
andra@Ajax-Alpha:~$ sysbench --test=cpu --cpu-max-prime=100000 --num-threads=12 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 12
Doing CPU performance benchmark
Threads started!
Done.
Maximum prime number checked in CPU test: 100000
Test execution summary:
total time: 40.6918s
total number of events: 10000
total time taken by event execution: 487.9980
per-request statistics:
min: 34.56ms
avg: 48.80ms
max: 730.18ms
approx. 95 percentile: 44.61ms
Threads fairness:
events (avg/stddev): 833.3333/0.47
execution time (avg/stddev): 40.6665/0.01
这意味着相同量的计算需要额外 8 秒，即主电源运行服务器所需时间的 25%。
我想知道这是否与服务器可用的备用电源不足有关？或者
无论为服务器提供多少备用电源，在使用备用电源运行时，性能都会大大下降？
答案1
在 Windows 上，操作系统能够检测服务器何时使用电池供电，并限制 CPU 以节省电量。如果您的系统上配置了类似的东西，我一点也不惊讶。