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heap_2.c causes out of memory
Posted by Martin Velek on August 20, 2009
Hello,
I am running this code:
void testMem(void *pvParameters)
{
unsigned char * mem;
for (int v = 0; v < 100000; v++)
{
for (int i = 1900; i < 2500; i++)
{
mem = (unsigned char *) pvPortMalloc((i) * sizeof(unsigned char));
if (NULL == mem)
{
// set breakpoint here
}
vPortFree(mem);
}
}
}
and after a while the mem becomes null and breakpoint is hitted. This code is running on CortexM3, LM3S8962 copiled by gcc or IAR and freeRTOS 5.4.2. Memory is configTOTAL_HEAP_SIZE ( ( size_t ) ( 32768 ) ).
This is a school problem example but I have discovered it in the real situation during receiving ethernet packets.
Have anyone the same problem?
Regard,
Martin
I am running this code:
void testMem(void *pvParameters)
{
unsigned char * mem;
for (int v = 0; v < 100000; v++)
{
for (int i = 1900; i < 2500; i++)
{
mem = (unsigned char *) pvPortMalloc((i) * sizeof(unsigned char));
if (NULL == mem)
{
// set breakpoint here
}
vPortFree(mem);
}
}
}
and after a while the mem becomes null and breakpoint is hitted. This code is running on CortexM3, LM3S8962 copiled by gcc or IAR and freeRTOS 5.4.2. Memory is configTOTAL_HEAP_SIZE ( ( size_t ) ( 32768 ) ).
This is a school problem example but I have discovered it in the real situation during receiving ethernet packets.
Have anyone the same problem?
Regard,
Martin
RE: heap_2.c causes out of memory
Posted by Dave on August 20, 2009
This will be caused by memory fragmentation. See http://www.freertos.org/a00111.html where it says heap_2 "Should not be used if the memory being allocated and freed is of a random size".
RE: heap_2.c causes out of memory
Posted by Martin Velek on August 24, 2009
Hi Dave,
thanks a lot. This was my problem. I am trying to implement a bget maybe it will help.
thanks a lot. This was my problem. I am trying to implement a bget maybe it will help.
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Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.