This is information about well known numbers on various OSes and architectures. This information is obtained with a tiny C program, available at http://www.via.ecp.fr/~bbp/sysnumbers/systest/systest.c and at http://www.via.ecp.fr/~bbp/sysnumbers/systest/systest-kr.c for the non-ANSI version (yes, even today, some compilers do not recognize ANSI style); older versions may also be found at http://www.via.ecp.fr/~bbp/sysnumbers/systest/. The page itself is generated with a python load of crap available at http://www.via.ecp.fr/~bbp/sysnumbers/sysnumbers.pyg. Of course, some of these numbers may vary depending on local conditions. They may also be randomized by certain operating systems and/or kernel patches. They are given as is.

Please feel free to send feedback, improvements, corrections and contributions to this page to bbp@via.ecp.fr. To submit a new entry, please mail me the output on stdout of the aforementionned systest software, and don't forget to tell me which CPU you are using, as well as any other detail of importance (kernel patches, distribution and amount of memory on Linux boxes for instance). Don't forget I don't know all architectures, and this implies that your entry will be useless if you don't supply enough information. I can't guess what parameters may be of importance on your particular operating system, nor can I guess what the complete name of your architecture is if I don't have it. If you really want to do the perfect submission, put a [systest] flag in the subject field. At last, if you don't want to be listed in the credits section, don't forget to tell me.

Table of contents

AIX

AIX 4.3

AIX 5.1

AIX 5.2

AIX 5.3

BSD

BSD/OS 4.0

Use this values with care, they are probably partly wrong. The stack and the heap are probably located in adjacent pages, yielding a wrong stack address. Any BSD/OS specialist around got a better explanation?

cpu	code	rodata	data	bss	sbrk	stack	shared libs	mmap	uname -a	misc
x86	0x804866C	0x8048876	0x8049B3C	0x8049B40	0x804C000	0x804C000	0x8049A60	0xC0D0000	BSD/OS foobar 4.0 BSDI BSD/OS 4.0 i386

FreeBSD 4.6

NetBSD 1.5

NetBSD 1.6

OpenBSD 2.9

OpenBSD 3.1

Compaq Tru64 Unix

Compaq Tru64 Unix 4

Compaq Tru64 Unix 5

Darwin

Darwin 5.5

Darwin 6.0

Darwin 6.7

OS X 10.2

cpu	code	rodata	data	bss	sbrk	stack	shared libs	mmap	uname -a	misc
Power Mac G5 PowerPC 970 (2.2) @ 1.8GHZ	0x23C4	0x2DB8	0x3420	0x311C	0x85000	0xC0000000	0xA0008DCC	0x4A5000	Darwin foobar 6.7.5 Darwin Kernel Version 6.7.5: Mon Aug 11 19:28:40 PDT 2003; root:xnu/xnu-344.21.73.obj~1/RELEASE_PPC Power Macintosh powerpc

Darwin 7.9

OS X 10.3

cpu	code	rodata	data	bss	sbrk	stack	shared libs	mmap	uname -a	misc
Power Mac G5 PowerPC 970 (2.2) @ 1.8GHZ	0x2420	0x2DB8	0x3420	0x311C	0x1008000	0xC0000000	0xA000B2E8	0x25000	Darwin foobar 7.9.0 Darwin Kernel Version 7.9.0: Wed Mar 30 20:11:17 PST 2005; root:xnu/xnu-517.12.7.obj~1/RELEASE_PPC Power Macintosh powerpc

Darwin 8.0

OS X 10.4

cpu	code	rodata	data	bss	sbrk	stack	shared libs	mmap	uname -a	misc
Power Mac G5 PowerPC 970 (2.2) @ 1.8GHZ	0x212C	0x2D84	0x3420	0x3114	0x1008000	0xC0000000	0xA000EFDC	0x26000	Darwin foobar 8.0.0 Darwin Kernel Version 8.0.0: Sat Mar 26 14:15:22 PST 2005; root:xnu-792.obj~1/RELEASE_PPC Power Macintosh powerpc

HP-UX

HP-UX 11i

IRIX

IRIX 6

Linux

Linux 2.0

Linux 2.2

Linux 2.4

Linux 2.6

SCO UnixWare

SCO UnixWare 7

SunOS

SunOS 5.6

SunOS 5.7

SunOS 5.8

SunOS 5.9

SunOS 5.10

Keywords explanation

Here is a brief explanation of the various keywords used in the above information (look at systest's code for more detail).

• cpu: everything I know about the platform's CPU; notation 2@200MHz means 2 cpus running at 200MHz.
• code: address where applications code is located on the platform.
• rodata: address of constant initialized data on the platform, typically quoted strings in C source code.
• data: address of variable initialized data on the platform, typically static and global, initialized at definition time, variables in C source code
• bss: address of unitialized data on the platform, typically static and global, unitialized variables in C source code.
• sbrk: typically the beginning of the heap (addresses returned by malloc()), most of the time.
• stack: the first address after the stack on the platform, this is where automatic variables are allocated.
• mmap: addresses where files are mmap()ed on the platform, certain malloc() implementations may also return addresses in this area.

Credits

Thanks to:

• Endymion
• Gruiick (http://www.aldil.org) very special thanks, Gruiick, and quadruple beer for you
• slow
• intropy
• Henrisson
• Daniel Lima
• LTF aka foobar
• Luciano Notarfrancesco
• MaXX
• Ol
• Sha and his VAX
• sheepkiller and the cult of the dead sheep
• VIA Centrale Reseaux
• Bojan Zdrnja
• zorgon
• others who prefer not being listed here.