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README for Memory Allocation Debugging If it is necessary or desired to debug the memory allocation process in LZMA, edit the file C/Alloc.c and uncomment the line: /* #define _SZ_ALLOC_DEBUG */ Then, add this to the Makefile and relink. This output will show chunks of memory Alloc uses during LZMA compression. Output will appear similar to this: Alloc 284484 bytes, count = 0, addr = 44251008 Alloc 65536 bytes, count = 1, addr = 80636F0 Alloc 12288 bytes, count = 2, addr = 80736F8 Alloc 12288 bytes, count = 3, addr = 8076700 Alloc 4456448 bytes, count = 4, addr = 43E10008 Alloc 102877690 bytes, count = 5, addr = 3DBF3008 Alloc 604246024 bytes, count = 6, addr = 19BB1008 Free; count = 6, addr = 43E10008 Free; count = 5, addr = 19BB1008 Free; count = 4, addr = 3DBF3008 Free; count = 3, addr = 80736F8 Free; count = 2, addr = 8076700 Free; count = 1, addr = 80636F0 Free; count = 0, addr = 44251008 As you can see, LZMA takes large chunks of ram and sometimes it can use more than what is available and return an SZ_ERROR_MEM (2) code.