Re: [Discuss-gnuradio] ANCI-C vs Gnuradio/C++ speeeed

[Eric Blossom]

On Sun, May 14, 2006 at 09:40:16AM -0400, Achilleas Anastasopoulos wrote:
> 
> I run the following simple test, compiled with
> g++ test.cc -o test
> and I got the following results.
> I see a 4-fold speed reduction using STL.
> What am I doing wrong?
> 
> Achilleas

You're not using the "standard level of optimization" -O2

E.g.,

address@hidden tmp]$ g++ -O2 test.cc -o test
address@hidden tmp]$ time ./test 100000 1

real    0m1.797s
user    0m1.792s
sys     0m0.004s
address@hidden tmp]$ time ./test 100000 2

real    0m1.797s
user    0m1.796s
sys     0m0.000s