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

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

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

 

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).

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

 

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.