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'make bootstrap' oprofile (13% on bash?)
On Thu, 28 Apr 2005 10:29:32 +0100, Andrew Haley <aph@redhat.com> writes:
> > -- and it wouldn't surprise me if the libjava build procedure were a
> > major contributor there.
>
> Yes. This is a profile of the libgcj build. The single biggest user
> of CPU is the libtool shell script, which uses more than a quarter of
> the total (non-kernel) CPU time. However, it's important not to be
> misled -- I'm sure the linker causes a huge amount of disk activity,
> so it's not just CPU time that is important.
>
> Having said that, I suspect that the single biggest improvement to the
> libgcj build time would be either to remove the libtool shell script
> altogether or find some way to reduce its use or make it faster.
>
bash is the third-most prominent program in the result of a full 'make
bootstrap' oprofile on gcc-4.1-20050424 configured with
--disable-checking. A few other breakdowns, including for jc1 and cc1
exist on http://www.cs.rice.edu/~scrosby/tmp/GCC/
This was done on machine with 1.5gb of RAM. As the build+src
directories add to 1.1gb, there shouldn't have been any disk IO.
(Excerpted out of GCC-overall)
CPU: Athlon, speed 1830.27 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit mask of 0x00 (No unit mask) count 1800000
CPU_CLK_UNHALT...|
samples| %|
------------------
1571655 35.9269 /tmp/gccbuild/gcc/cc1
1108036 25.3289 /tmp/gccbuild/gcc/jc1
573302 13.1053 /bin/bash
178865 4.0887 /tmp/gccbuild/gcc/cc1plus
150641 3.4435 /bin/sed
111300 2.5442 /usr/lib/gcc-lib/i486-linux/3.3.5/cc1
110216 2.5424 /usr/bin/as
60841 1.4034 /tmp/gccbuild/gcc/build/genattrtab
44633 1.0296 /usr/local/src/linux-2.6.10/vmlinux
38924 0.8979 /usr/bin/ld
23191 0.5350 /usr/bin/expr
Scott