Re: [Qemu-devel] Debian 7.8.0 SPARC64 on qemu - anything i can do to speedup the emulation?

[Dennis Luehring <dl.soluz@gmx.net>]

Am 06.08.2015 um 11:00 schrieb Karel Gardas:
> Denis, if NetBSD is fast in qemu and if it provides sparc64 user-land,
> perhaps also its GCC is sparc64 binary and if so, then it would be
> good if you do your original benchmark of compiling pugixml.cpp and
> write the numbers here for comparison? I would certainly appreciate it
> since I'll not get to this testing in foreseeable future again.

i've re-redone the benchmarks with Debian and NetBSD SPARC64

benchmarks:

compilation pugixml 1.6 pugixml.cpp:
g++ src/pugixml.cpp -g -Wall -Wextra -Werror -pedantic -std=c++0x -c
-MMD -MP

host: ~3 sec
guest-debian: ~3:52.6 (32bit gcc, virtio)
guest-debian: ~3:01.7 (32bit gcc, virtio, using the qcow2 image from an 
ramfs ramdisk)
guest-netbsd: ~3:27.6 (64bit gcc, non-virtio)
guest-netbsd: ~2:51.6 (64bit gcc, non-virtio, using the qcow2 image from 
an ramfs ramdisk)

runtime Aurelien Jarnos prime.c
gcc prime.c -o prime.out -lm

host: ~2 sec
guest-debian(-m32): ~3:37.5
guest-debian(-m64): ~11 sec
guest-netbsd(only -m64): ~11 sec

Aurelien Jarnos explained the "11 sec" boost running prime.c using -m64,
but still the NetBSD 64bit gcc needs 3:27.6 to compile pugixml.cpp - its
just one file, 1GB of RAM, no swapping

using a ramdisk gives even under debian(with virtio) a 50sek speedup, 
netbsd (without virtio) just gains 30sek

-----------------

host: Ubuntu 15.04 x64 (latest updates) i7, 8 Cores, 8 GB RAM
    uname -a
    Linux dl-Precision-M6500 3.19.0-25-generic #26-Ubuntu SMP Fri Jul 24 
21:17:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

    file /usr/bin/gcc
    /usr/bin/gcc: symbolic link to `gcc-4.9'
    file /usr/bin/gcc-4.9
    /usr/bin/gcc-4.9: ELF 64-bit LSB executable, x86-64, version 1 
(SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, 
BuildID[sha1]=f9897a3711d41df1d427f81bf3a60a60c377cd12, stripped

----------------

qemu: qemu 2.4.50 build from source (the former posted 2.3.93 was the 
wrong version)

    file ~/qemu/sparc64-softmmu/qemu-system-sparc64
    /home/dl/qemu/sparc64-softmmu/qemu-system-sparc64: ELF 64-bit LSB 
shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared 
libs), for GNU/Linux 2.6.32, 
BuildID[sha1]=8cae7ad397bb9beb12d1ad670c3170a8dceef139, not stripped

----------------

guest-debian: Debian 7.8.0 SPARC64 (mixed 32/64 bit kernel/userland)

uname -a
Linux debian 3.2.0-4-sparc64 #1 Debian 3.2.68-1+deb7u2 sparc64 GNU/Linux

32bit GCC

file /usr/bin/gcc
/usr/bin/gcc: symbolic link to `gcc-4.6'
file /usr/bin/gcc-4.6
/usr/bin/gcc-4.6: ELF 32-bit MSB executable, SPARC32PLUS, V8+ Required, 
version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 
2.6.26, BuildID[sha1]=0x64ad1bef0a0bfdb8780363e811c39b7c97d567ac, stripped

----------------

guest-netsbd: NetBSD 6.1.5 SPARC64
(according to the documentation + mailing list questions its pure 64bit
kernel and userland)

uname -a
NetBSD myhost.mydom 6.1.5 NetBSD 6.1.5 (GENERIC) sparc64

64bit GCC

file /usr/bin/gcc
/usr/bin/gcc: ELF 64-bit MSB executable, SPARC V9, relaxed memory 
ordering, (SYSV), dynamically linked (uses shared libs), for NetBSD 
6.1.5, not stripped

----------------