On Tue, Jan 18, 2011 at 03:32:05PM +0100, Roman Divacky wrote: > On Mon, Jan 17, 2011 at 10:44:11AM -0800, Steve Kargl wrote: > > How does one build an executable for profiling with clang? > > LLVM (and thus clang) does not support GPROF profiling. > > > clang -o testf -O2 -march=native -pipe -static -pg -I/usr/local/include > > -I../mp testf.c -L/usr/local/lib -L../mp -lsgk -lmpfr -lgmp > > -L/usr/home/kargl/work/lib -lm_clang_p > > clang: warning: the clang compiler does not support '-pg' > > > > I suppose it will be pointless to ask, but shouldn't clang > > support one of the most basic gcc compiler options if clang > > is to replace gcc as the base system compiler? > > is GPROF really needed at this point? we have HWPMC, isnt > it sufficient? >
Well, I have not found a suitable command or commands to replace cc -o testf -O2 -march=native -pipe -static -pg testf.c -lm_p ./testf -s -n 10 10000000 expf calls in 1.846954 seconds. gprof -b -l ./testf testf.gmon | head -15 |tail -10 granularity: each sample hit covers 4 byte(s) for 0.01% of 1.84 seconds % cumulative self self total time seconds seconds calls ms/call ms/call name 55.8 1.03 1.03 0 100.00% _mcount [1] 22.9 1.45 0.42 10000000 0.00 0.00 t_expf [4] 12.9 1.68 0.24 1 236.65 709.57 main [2] 5.6 1.79 0.10 0 100.00% .mcount (29) 2.8 1.84 0.05 10000000 0.00 0.00 __fpclassifyf [5] 0.0 1.84 0.00 6 0.00 0.00 memchr [6] 0.0 1.84 0.00 6 0.00 0.00 memcpy [7] Not to mention, one needs to compile a kernel with hwpmc included whereas gprof does not require a special kernel device driver. -- Steve _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "[email protected]"
