Il 08/05/2013 00:57, Aurelien Jarno ha scritto: > On Tue, May 07, 2013 at 11:29:20PM +0200, Artyom Tarasenko wrote: >> On Tue, May 7, 2013 at 1:38 PM, Torbjorn Granlund <t...@gmplib.org> wrote: >>> The 2nd table of http://gmplib.org/devel/testsystems.html shows all >>> emulated systems I am using, most of which are qemu-based. >> >> Do I read it correct that qemu-system-ppc64 with the slowdown factor >> of 33 is ~3 times faster than qemu-system-sparc64 with the slowdown >> factor of 96 ? >> Do they both use Debian Wheezy guest? You have a remark that ppc64 has >> problems with its clock. Was it taken into account when the slowdown >> factors were calculated? >> > > Clock or not, it should be noted that qemu-system-sparc64 is undoubtedly > slower (at least 5 to 10 times) than qemu-system-{arm,ppc,mips,...} on > some type of load like perl scripts.
I guess that's the register windows. There's only so much you can do to optimize them, and heavily recursive workloads (like Perl, or the RTL half of GCC) pay a hefty price. Paolo
