why real is shorter than sys in the result of time?<br><br><div class="gmail_quote">2009/3/29 Török Edwin <span dir="ltr"><<a href="mailto:edwintorok@gmail.com">edwintorok@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>
<br>
I tested the new clang driver, and I am very pleased with the results.<br>
Nice job!<br>
<br>
Here are the results when building ClamAV with a default ./configure<br>
(which sets CFLAGS to -O2 -g),<br>
and running time make -j4 >/dev/null:<br>
<br>
gcc-4.3: real 0m19.615s user 0m53.727s sys 0m5.800s<br>
ccc: real 0m16.736s user 0m39.726s sys 0m7.596s<br>
clang: real 0m13.786s user 0m33.142s sys 0m5.136s<br>
llvm-gcc: real 0m13.046s user 0m32.662s sys 0m5.332s<br>
ccache+gcc: real 0m4.703s user 0m6.936s sys 0m3.380s<br>
<br>
As you can see clang is now almost as fast llvm-gcc, and definitely<br>
faster than gcc, and the old ccc driver.<br>
I'm a bit surprised that clang isn't faster than llvm-gcc, but I think<br>
most of the time is spent in the optimizers/codegen<br>
and not in parsing (this is a C application, includes are not as huge as<br>
for C++).<br>
<br>
Best regards,<br>
--Edwin<br>
<br>
<br>
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</blockquote></div><br>