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Where to check or change the stack size/heap size ?

Intellectual 710 points

std

In Linux SDK, where can I check or change the stack size and heap size of the ARM program and DSP program ?

Intellectual 710 points

std

• May 22, 2012 6:42 AM
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• Expert 5375 points

  

  Schuyler Patton

  

  • May 22, 2012 5:47 PM

  For the stack size of a DSP program, perhaps look a the linker command file for the DSP program.

  On the arm to get the current Stack size, 

  root@am180x-evm:~# ulimit -a
  time(seconds)        unlimited
  file(blocks)         unlimited
  data(kb)             unlimited
  stack(kb)            8192
  coredump(blocks)     0
  memory(kb)           unlimited
  locked memory(kb)    64
  process              989
  nofiles              1024
  vmemory(kb)          unlimited
  locks                unlimited

  << setting the stack size on the ARM to 32K >>

  root@am180x-evm:~# ulimit -s 32768

  root@am180x-evm:~# ulimit -a
  time(seconds)        unlimited
  file(blocks)         unlimited
  data(kb)             unlimited
  stack(kb)            32768
  coredump(blocks)     0
  memory(kb)           unlimited
  locked memory(kb)    64
  process              989
  nofiles              1024
  vmemory(kb)          unlimited
  locks                unlimited

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  std

  

  • May 23, 2012 2:26 AM

  In reply to Schuyler Patton:

  Hi Schuyler,

   

  Your method is not a permanent change because I need to change it every time when I run the program.

  How can I change stack size permanently so that when I compile and run the ARM program, the change is permanent ?

  Similarly, how to permanently change the heap size size of the ARM program ?

   

  Thanks,

  Mr Tan

   

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• Guru 29000 points

  

  Clemens Ladisch

  

  • May 23, 2012 10:10 AM

  In reply to std:

  There are no limits stored in the program file.

  Heap and stack sizes are user resource limits, which can be set for all programs run from a shell with the ulimit command, or from the program itself with the setrlimit system call (if the user has sufficient privileges; see the man page).

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• Expert 1885 points

  

  lofna kumari

  

  • Feb 12, 2016 7:56 AM

  In reply to Schuyler Patton:

  Hi,

  I am using am335x platform and running my customized applications using SDK7. I am running some apps in background monitoring.

  After some time my system is very slow. Is there any chance to improve my system with good performance using any ulimit command.

  In my system the below parameters are default configured. 

  root@am335x-evm:~# ulimit -a
  core file size (blocks, -c) 0
  data seg size (kbytes, -d) unlimited
  scheduling priority (-e) 0
  file size (blocks, -f) unlimited
  pending signals (-i) 3775
  max locked memory (kbytes, -l) 64
  max memory size (kbytes, -m) unlimited
  open files (-n) 1024
  pipe size (512 bytes, -p) 8
  POSIX message queues (bytes, -q) 819200
  real-time priority (-r) 0
  stack size (kbytes, -s) 8192
  cpu time (seconds, -t) unlimited
  max user processes (-u) 3775
  virtual memory (kbytes, -v) unlimited
  file locks (-x) unlimited

  do the needful.

  Regards,

  Lofna

   

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  Clemens Ladisch

  

  • Feb 12, 2016 8:11 AM

  In reply to lofna kumari:

  ulimit is a mechnism to limit resources. It cannot be used to give you more resources than your machine actually has.
  
  If your system becomes slow after some time, the most likely reason is that your applications leak memory.

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