Re: [Qemu-devel] large memory requirements for translate.c a barrier

[Paolo Bonzini]

Il 22/03/2013 08:08, address@hidden ha scritto:
> Penned by Paolo Bonzini on 20130321  3:25.51, we have:
> | Il 21/03/2013 08:53, address@hidden ha scritto:
> | > load averages:  6.74,  6.23,  5.17                    leveno.fries.net 
> 02:42:23
> | > 201 processes: 200 idle, 1 on processor
> | > CPU0 states:  0.4% user,  0.0% nice, 33.3% system, 37.1% interrupt, 29.1% 
> idle
> | > CPU1 states:  0.2% user,  0.0% nice, 64.5% system,  0.0% interrupt, 35.3% 
> idle
> | > Memory: Real: 359M/907M act/tot Free: 80M Cache: 46M Swap: 1076M/4095M
> | > Seconds to delay: 
> | >   PID USERNAME PRI NICE  SIZE   RES STATE     WAIT      TIME    CPU 
> COMMAND
> | > 19820 todd      -5    0 1116M   38M sleep/1   biowait   2:54 14.75% cc1
> | > 
> | > address@hidden/pE ~???239$ ps awwwx | grep cc1
> | > 19820 pz  D+      2:49.61 
> /usr/lib/gcc-lib/i386-unknown-openbsd5.3/4.2.1/cc1 -fpreprocessed 
> /home/todd/.ccache/tmp/translate.tmp.leveno.fries.net.1478.i -quiet -dumpbase 
> translate.tmp.leveno.fries.net.1478.i -m32 -auxbase-strip 
> /home/todd/.ccache/6/2/648c89832d69fca8ff8953cca44f28-1086936.o.tmp.leveno.fries.net.1478
>  -g -O2 -Wstrict-prototypes -Wall -Wundef -Wwrite-strings 
> -Wmissing-prototypes -Wno-redundant-decls -Wendif-labels 
> -Wmissing-include-dirs -Wnested-externs -Wformat-security -Wformat-y2k 
> -Winit-self -Wold-style-definition -fPIE -fno-strict-aliasing -fno-gcse 
> -fstack-protector-all -o /home/todd/.tmp/cc1YGXzU.s
> | > 
> | > Reading specs from /usr/lib/gcc-lib/i386-unknown-openbsd5.3/4.2.1/specs
> | > Target: i386-unknown-openbsd5.3
> | > Configured with: OpenBSD/i386 system compiler
> | > Thread model: posix
> | > gcc version 4.2.1 20070719 
> | > 
> | 
> | That's an older GCC than the one I was using.  For you it may be
> | -fno-var-tracking.
> 
> Still no joy:
> 
>   PID USERNAME PRI NICE  SIZE   RES STATE     WAIT      TIME    CPU COMMAND
> 21212 todd      -5   20 1142M  118M sleep/0   -         1:03 37.30% cc1
> 
> cc -I. -I/home/todd/git/sw/3rdParty/qemu 
> -I/home/todd/git/sw/3rdParty/qemu/include 
> -I/home/todd/git/sw/3rdParty/qemu/tcg 
> -I/home/todd/git/sw/3rdParty/qemu/tcg/i386  -fPIE -DPIE -m32 -D_GNU_SOURCE 
> -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes 
> -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes 
> -fno-strict-aliasing -I/usr/local/include -I/usr/X11R6/include 
> -Wno-redundant-decls -DTIME_MAX=INT_MAX -fno-gcse -fno-var-tracking  
> -fstack-protector-all -Wendif-labels -Wmissing-include-dirs -Wnested-externs 
> -Wformat-security -Wformat-y2k -Winit-self -Wold-style-definition  
> -I/usr/local/include/libpng -I/usr/X11R6/include/pixman-1 -DHAS_AUDIO 
> -DHAS_AUDIO_CHOICE  -I/home/todd/git/sw/3rdParty/qemu/target-i386 
> -Itarget-i386 -I.. -I/home/todd/git/sw/3rdParty/qemu/target-i386 -DNEED_CPU_H 
> -I/home/todd/git/sw/3rdParty/qemu/include -pthread 
> -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include 
> -I/usr/local/include -MMD -MP -MT target-i386/kvm-stub!
 .o -MF tar
get-i386/kvm-stub.d -O2 -D_FORTIFY_SOURCE=2 -g  -c -o target-i386/kvm-stub.o 
/home/todd/git/sw/3rdParty/qemu/target-i386/kvm-stub.c

Please try -fmem-report or -ftime-report and see where the time is spent.

Alternatively, just compile with -O1 or even -O0.

Paolo