dddh@gentoo64 ~/pycuda/examples/wiki-examples $ python2 MeasureGpuarraySpeedRandom.py
1024
2048
4096
8192
16384
32768
65536
131072
262144
524288
1048576
2097152
4194304
8388608
16777216
Size    |Time GPU      |Size/Time GPU|Time CPU         |Size/Time CPU|GPU vs CPU speedup
--------+--------------+-------------+-----------------+-------------+------------------
1024    |0.153653765625|6664.33390574|3.07443847656e-05|33306895.1552|0.000200088716606 
2048    |0.157299203125|13019.7735228|2.60764808655e-05|78538205.0042|0.00016577630622  
4096    |0.145143890625|28220.2715   |4.56705589294e-05|89685786.5551|0.000314657122203 
8192    |0.15767221875 |51955.8871242|8.96420516968e-05|91385681.6632|0.000568534218694 
16384   |0.153608265625|106660.926958|0.00020297354126 |80719880.5239|0.00132137121941  
32768   |0.1371766875  |238874.407869|0.000357318817139|91705217.9407|0.00260480715529  
65536   |0.1297976875  |504908.841307|0.000716115844727|91515919.5019|0.00551716951603  
131072  |0.119910328125|1093083.49038|0.0014274317627  |91823653.7994|0.0119041602589   
262144  |0.122396539063|2141759.90602|0.00294417700195 |89038125.0265|0.0240544138299   
524288  |0.13891190625 |3774248.11273|0.00559763574219 |93662400.3682|0.0402962992396   
1048576 |0.144469484375|7258114.08919|0.0117092080078  |89551402.5629|0.0810496975086   
2097152 |0.119102294922|17607989.8492|0.02332546875    |89908246.7528|0.195843990792    
4194304 |0.116172734375|36104030.9722|0.0510877441406  |82100004.0333|0.439756750286    
8388608 |0.123456425781|67947925.326 |0.102811660156   |81591990.5121|0.832776904933    
16777216|0.109374697266|153392113.71 |0.202725410156   |82758328.0609|1.85349459449