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

[qemu-devel@email.fries.net]

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Penned by Paolo Bonzini on 20130316  3:14.29, we have:
| Il 15/03/2013 20:21, Todd T. Fries ha scritto:
| >   PID USERNAME PRI NICE  SIZE   RES STATE     WAIT      TIME    CPU COMMAND
| > 28818 todd      64    0 1142M   53M onproc/0  -         2:01 17.24% cc1
| > 
| > For systems with lower limits on user process memory, this prevents things
| > from building.
| > 
| > For systems with less physical ram, this presents lots of swapping just to
| > build the source files.
| > 
| > Is there any hints or hope of breaking translate.c up into a smaller file?
| 
| It's a GCC bug.  We have worked around it in recent versions of QEMU;
| what version are you trying to compile?
| 
| You can compile that file with "-O2 -fno-gcse".
| 
| Paolo

I don't note a huge improvement:

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

todd@leveno/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 
-- 
Todd Fries .. todd@fries.net

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