bitcnts是mibench眾多測試軟件中的一個,但足夠測試CPU的性能.如果需要全部測試軟件，請從密西根大學網站上下載：http://www.eecs.umich.edu/mibench/

下面貼上SEP4020+Linux2.6上跑1000000位測試時間

測試環境CPU88MHz 開LCD NFS網絡文件系統

/mibench/bitcount # ./bitcnts.arm?? 1000000

Bit counter algorithm benchmark

Optimized 1 bit/loop counter ?? ?? > Time: 1.880 sec.; Bits: 16574990

Ratko's mystery algorithm ?? ?? ?? > Time: 0.980 sec.; Bits: 15358803

Recursive bit count by nybbles ?? ??? > Time: 4.130 sec.; Bits: 15309077

Non-recursive bit count by nybbles > Time: 1.070 sec.; Bits: 16253383

Non-recursive bit count by bytes (BW) > Time: 0.770 sec.; Bits: 16617466

Non-recursive bit count by bytes (AR) > Time: 0.980 sec.; Bits: 15233906

Shift and count bits ?? ?? ?? ?? ?? > Time: 6.000 sec.; Bits: 15691122

Best?? > Non-recursive bit count by bytes (BW)

Worst > Shift and count bits

1000000位的測試就慢了很多

/mibench/bitcount # ./bitcnts.arm 10000000

Bit counter algorithm benchmark

Optimized 1 bit/loop counter ?? ?? > Time:?? 18.620 sec.; Bits: 164838829

Ratko's mystery algorithm ?? ?? ?? > Time: 9.740 sec.; Bits: 158063216

Recursive bit count by nybbles ?? ??? > Time:?? 41.150 sec.; Bits: 160571544

Non-recursive bit count by nybbles > Time:?? 10.630 sec.; Bits: 162707129

Non-recursive bit count by bytes (BW) > Time: 7.640 sec.; Bits: 170893188

Non-recursive bit count by bytes (AR) > Time: 9.790 sec.; Bits: 154106854

Shift and count bits ?? ?? ?? ?? ?? > Time:?? 59.870 sec.; Bits: 154959757

Best?? > Non-recursive bit count by bytes (BW)

Worst > Shift and count bits

/mibench/bitcount #

有時間測試2410的。

落鶴生：我要有時間也要好好測試一下目前這個i.mx27的板子上的v2ip程序，呵呵。

總結

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