我先说我自己的。cpu:P4 1.6G Mobile
内存:512M ddr266运行结果:
hit count:20 Mdirect Int:130 millisecond, speed 157M/s
Double:410 millisecond, speed 49M/sInt:782 millisecond, speed 26M/s
Double:410 millisecond, speed 49M/s
内存:512M ddr266运行结果:
hit count:20 Mdirect Int:130 millisecond, speed 157M/s
Double:410 millisecond, speed 49M/sInt:782 millisecond, speed 26M/s
Double:410 millisecond, speed 49M/s
解决方案 »
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neicun1:512Mhit count:20 Mdirect Int:78 millisecond, speed 262M
Double:203 millisecond, speed 100M/sInt:422 millisecond, speed 48M/s
Double:203 millisecond, speed 100M/s
P3:667
288 SDRAMhit count:20 Mdirect Int:661 millisecond, speed 30M/s
Double:1022 millisecond, speed 20M/sInt:1402 millisecond, speed 14M/s
Double:1151 millisecond, speed 17M/s
512 RAMhit count:20 Mdirect Int:93 millisecond, speed 220M/s
Double:219 millisecond, speed 93M/sInt:188 millisecond, speed 108M/s
Double:218 millisecond, speed 93M/s
direct Int:661 millisecond, speed 30M/sDouble:561 millisecond, speed 36M/s
Int:1112 millisecond, speed 18M/sDouble:941 millisecond, speed 21M/s
Double:350 millisecond, speed 58M/sInt:581 millisecond, speed 35M/s
Double:441 millisecond, speed 46M/s
hit count:20 Mdirect Int:631 millisecond, speed 32M/s
Double:1052 millisecond, speed 19M/sInt:1282 millisecond, speed 15M/s
Double:1121 millisecond, speed 18M/s
hit count:20 Mdirect Int:78 millisecond, speed 262M/sException
in thread "main" java.lang.ArithmeticException: / by zero
at PO.main(PO.java(Compiled Code))
direct Int:78 millisecond, speed 262M/s
Double:281 millisecond, speed 72M/sInt:531 millisecond, speed 38M/s
Double:360 millisecond, speed 56M/s
hit count:20M
direct Int:719 millisecond, speed 28M/s
Double:1547 millisecond, speed 13M/sInt:1140 millisecond, speed 17M/s
Double:1422 millisecond, speed 14M/s再次运行时,数值有变
Double:942 millisecond, speed 21M/sInt:1261 millisecond, speed 16M/s
Double:852 millisecond, speed 24M/s==============================================================
另一台Xeon 2G/1G内存
hit count:20 Mdirect Int:94 millisecond, speed 217M/s
Double:313 millisecond, speed 65M/sInt:578 millisecond, speed 35M/s
Double:329 millisecond, speed 62M/s
多运行几次发现结果出入比较大,此测试程序有问题
因此,测试程序只开了24M的数据(int 8M,double 16M),受各种各样缓存的影响较大。总的来说,第一次运行的结果比较准确。
连续运行有10-30%的偏差可以接受。兄弟的机子如果性能强劲,比如xeon的机子,可能尝试开240M的数据,既将main中第一行
multi改为1,第二行int size=2*1024*1024;改为int size=20*1024*1024;
这样结果会更稳定。
hit count:20 Mdirect Int:272 millisecond, speed 75M/s
Double:383 millisecond, speed 53M/sInt:809 millisecond, speed 25M/s
Double:443 millisecond, speed 46M/s
512 DDR
hit count:20 Mdirect Int:79 millisecond, speed 259M/s
Double:250 millisecond, speed 81M/sInt:500 millisecond, speed 40M/s
Double:250 millisecond, speed 81M/s
512 DDRhit count:20 Mdirect Int:94 millisecond, speed 217M/s
Double:422 millisecond, speed 48M/sInt:718 millisecond, speed 28M/s
Double:407 millisecond, speed 50M/s
512 DDR
hit count:20 M
direct Int:62 millisecond, speed 330M/s
Double:344 millisecond, speed 59M/s
Int:625 millisecond, speed 32M/s
Double:250 millisecond, speed 81M/s
ddr 512Mhit count:20 Mdirect Int:109 millisecond, speed 187M/s
Double:313 millisecond, speed 65M/sInt:219 millisecond, speed 93M/s
Double:296 millisecond, speed 69M/s
Double:282 millisecond, speed 72M/sInt:500 millisecond, speed 40M/s
Double:281 millisecond, speed 72M/s
Double:161 millisecond, speed 127M/sInt:460 millisecond, speed 44M/s
Double:181 millisecond, speed 113M/s
504M DDR
----------------------------------------------hit count:20 Mdirect Int:94 millisecond, speed 217M/s
Double:312 millisecond, speed 65M/sInt:641 millisecond, speed 31M/s
Double:312 millisecond, speed 65M/s
Double:203 millisecond, speed 100M/sInt:375 millisecond, speed 54M/s
Double:187 millisecond, speed 109M/s
P4 3.0G (双内核)
512M DDR400 双通道
512 DDR
----------------------------------
hit count:20 Mdirect Int:125 millisecond, speed 163M/s
Double:359 millisecond, speed 57M/sInt:297 millisecond, speed 68M/s
Double:360 millisecond, speed 56M/s
512 DDR
----------------------------------
hit count:20 Mdirect Int:125 millisecond, speed 256M/s
Double:359 millisecond, speed 72M/sInt:297 millisecond, speed 37M/s
Double:360 millisecond, speed 78M/s
-----------------------------------
hit count:20 Mdirect Int:79 millisecond, speed 259M/s
Double:250 millisecond, speed 81M/sInt:484 millisecond, speed 42M/s
Double:250 millisecond, speed 81M/s
64K
----------------------------------
hit count:20000 H