Re: [gnugo-devel] Memory usage

[Dave Denholm]

"Alexander Pruss" <address@hidden> writes:

> Hi!
>
> I'm thinking of porting GnuGo to PalmOS 5, but am wondering how
> feasible this is for devices most of which have less than 4mb of
> dynamic RAM available (without hacks to expand dynamic heap).  To
> check for feasibility, I'd like to know a bit more information.
>
> 1. I am wondering what the code size is.  Does anybody have an ARM
> Linux build?  That would be the best test of code size, I guess.  My
> cygwin x86 build is 4.8mb.


I do have cross-compilers around, but unfortunately the gnugo build
system expects to build and run mkpat on the host system as part of
the build. I think configure does support this kind of thing, but it
probably needs some extra work to support it.

I was able to build by just copying in the native mkpat etc manually.


The section sizes from objdump are

.text:   000b6a88
.rodata: 00069201
.data:   0013f0b0
.bss:    001a5f48

around 1Mb read-only and 3Mb writeable


Note that these are relatively old tools (for zaurus). gcc 4.x is
quite a lot better for arm.

Thumb would probably make it a bit smaller, if your target supports
that. But it's probably the ram size rather than the code size that's
more relavant.


> 2. How much dynamic memory is needed?
>

# cat /proc/15527/status
Name:   gnugo
State:  R (running)
Tgid:   15527
Pid:    15527
PPid:   12841
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       0       0       0
FDSize: 256
Groups: 0 
VmSize:    14340 kB
VmLck:         0 kB
VmRSS:     11120 kB
VmData:    10352 kB
VmStk:       144 kB
VmExe:      1156 kB
VmLib:      1308 kB
SigPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 8000000000000000
SigCgt: 0000000000000000
CapInh: 0000000000000000
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff

# cat /proc/15527/maps 
02000000-02121000 r-xp 00000000 00:09 11754047   
/home/system/var/mnt/tfs/ddenholm/gnugo-arm/interface/gnugo
02128000-02268000 rw-p 00120000 00:09 11754047   
/home/system/var/mnt/tfs/ddenholm/gnugo-arm/interface/gnugo
02268000-0247f000 rwxp 00000000 00:00 0
40000000-40019000 r-xp 00000000 1f:01 263        /lib/ld-2.2.2.so
40020000-40022000 rw-p 00018000 1f:01 263        /lib/ld-2.2.2.so
40022000-40047000 r-xp 00000000 1f:01 267        /lib/libm-2.2.2.so
40047000-4004a000 ---p 00025000 1f:01 267        /lib/libm-2.2.2.so
4004a000-40050000 rw-p 00020000 1f:01 267        /lib/libm-2.2.2.so
40050000-40159000 r-xp 00000000 1f:01 264        /lib/libc-2.2.2.so
40159000-40160000 ---p 00109000 1f:01 264        /lib/libc-2.2.2.so
40160000-40167000 rw-p 00108000 1f:01 264        /lib/libc-2.2.2.so
40167000-4096c000 rw-p 00000000 00:00 0
bffdc000-c0000000 rwxp fffdd000 00:00 0

 - does this help ?



dd
-- 
Dave Denholm              <address@hidden>       http://www.esmertec.com