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AR# 33196

14.7 MAP/PAR - How can I test my memory limitations which are leading to ERROR:Portability:3 errors?


Linux machines have a system limitation on the amount of memory that a single application can allocate, and a 32-bit Linux machine can theoretically allocate up to 4 Gb.

How can I test the amount of memory available to an application on my system?

I am receiving the error below:

ERROR:Portability:3 - This Xilinx application has run out of memory or has
encountered a memory conflict. Current memory usage is 2094816 kb. Memory
problems may require a simple increase in available system memory, or
possibly a fix to the software or a special workaround. To troubleshoot or
remedy the problem, first: Try increasing your system's RAM. Alternatively,
you may try increasing your system's virtual memory or swap space. If this
does not fix the problem, please try the following: Search the Answers
Database at support.xilinx.com to locate information on this error message.
If neither of the above resources produces an available solution, please use
Web Support to open a case with Xilinx Technical Support off of
support.xilinx.com. As it is likely that this may be an unforeseen problem,
please be prepared to submit relevant design files if necessary. "


The application size limit of a particular system can be tested by compiling and running the following source file "memlimit.c", which will allocate memory until the limit is reached.

#include <stdio.h>
#include <stdlib.h>

int main()
int i;
printf("Application memory limit is %d Mb\n",i);

To compile as a 32-bit executable:
gcc -m32 memlimit.c 
mv a.out memlimit

To run the executable:
host1 [417] ./memlimit

The application memory limit is 4076 M.
AR# 33196
Date Created 07/23/2009
Last Updated 01/07/2015
Status Active
Type General Article
  • FPGA Device Families
  • ISE Design Suite