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how many memory does IPC need?

Hi,

   I'm using IPC MessageQ to do inter-core communication. I observed the following things. First I config the memory heap size in Memory and BIOS module to be 1024 for slave cores. The IPC_start function fails to start up IPC modules. Then I change the heap size to 12288 for each slave core. The program then work fine and my tasks are correctly run. I want to minimize the memory footprint of slave core images, so I wonder what's the minimal heap size required to run IPC ?  I can't find the answer in IPC UG. Anyone get a clue?