[cfe-dev] Using the new clang driver

[polarj]

why  real is shorter than sys in the result of time?

2009/3/29 Török Edwin <edwintorok at gmail.com>

> Hi,
>
> I tested the new clang driver, and I am very pleased with the results.
> Nice job!
>
> Here are the results when building ClamAV with a default ./configure
> (which sets CFLAGS to -O2 -g),
> and running time make -j4 >/dev/null:
>
> gcc-4.3:    real    0m19.615s user  0m53.727s sys   0m5.800s
> ccc:           real    0m16.736s user  0m39.726s sys   0m7.596s
> clang:       real    0m13.786s user  0m33.142s sys   0m5.136s
> llvm-gcc:  real    0m13.046s user    0m32.662s sys   0m5.332s
> ccache+gcc: real    0m4.703s  user  0m6.936s  sys  0m3.380s
>
> As you can see clang is now almost as fast llvm-gcc, and definitely
> faster than gcc, and the old ccc driver.
> I'm a bit surprised that clang isn't faster than llvm-gcc, but I think
> most of the time is spent in the optimizers/codegen
> and not in parsing (this is a C application, includes are not as huge as
> for C++).
>
> Best regards,
> --Edwin
>
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20090329/135c7e9d/attachment.html>