malloc problems

Hello,

3 SDV systems, we'll call them Tom, Dick, & Harry:
(2)BigSur

	Tom   (1 x B3, 1GB Mem)
	Dick  (2 x B3, 1GB Mem)
(1)Lion
	Harry (4 x B3, 4GB Mem)

Problem:
When running the exact same executable, Dick and Harry, consistently give the same results and Tom consistently gives different results.

Systems have been verified to be the same in many aspects:
OS environment
Kernel
BIOS/Firmware
CMOS settings
Mem type and board locations
SCSI and settings

Below is a small sample of code and the results I get on each system:

dynamic_area = (unsigned char *) malloc ( membytes );
printf(" dyn_area = %x %lx, mem= %x \n",dynamic_area,dynamic_area,membytes);

Result from Tom: (1-way BigSur)
dyn_area = 40000010 40000010, mem= 2000018

Result from Dick & Harry:(2-way BigSur & 4-way Lion) dyn_area = 10 2000000000000010, mem= 2000018

Is it a single-CPU thing?
Any ideas are appreciated.

Thanks.
***************************************************************************

Donny Cooper                     | Direct Phone : (281) 465-1506
NEC Systems, Inc.                | Houston Metro: (281) 296-0912 x 1506
High Performance Computing Center| Fax          : (281) 465-1599
4200 Research Forest Dr, #400    | E-mail       : [email protected]
The Woodlands, TX 77381          | URL          : http://www.necservers.com

***************************************************************************

"Donny Cooper" <[email protected]> writes:

|> dynamic_area = (unsigned char *) malloc ( membytes );
|> printf(" dyn_area = %x %lx, mem= %x \n",dynamic_area,dynamic_area,membytes);

You are passing a pointer where an unsigned int and an unsigned long, resp., is expected. That results in undefined behaviour.

Andreas.

Andreas Schwab                                  "And now for something
SuSE Labs                                        completely different."
[email protected]
SuSE GmbH, Schanzäckerstr. 10, D-90443 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5