$ cat /proc/cpuinfo | grep cache_alignment
$ LEVEL1_DCACHE_LINESIZE

flag: -DLEVEL1_DCACHE_LINESIZE=`getconf LEVEL1_DCACHE_LINESIZE`

#define CACHE_LINE sysconf(_SC_LEVEL1_DCACHE_LINESIZE)

typedef struct node_t { //64 LEVEL1_DCACHE_LINESIZE
	unsigned char parent_sense;
	unsigned char* parent_pointer;

	//binary wakeup tree, every processor assigned static spot, parent reach down to child to tell them to wake up
	unsigned char* child_pointers[2];
	unsigned char have_children[4];
	unsigned char child_not_ready[4];

	unsigned char dummy;

	unsigned char padding[16];
} node_t; //total size must match 64 LEVEL1_DCACHE_LINESIZE

node_t* nodes;
posix_memalign((void **)&nodes, CACHE_LINE, (sizeof(node_t) * num_threads)); //sysconf(_SC_LEVEL1_DCACHE_LINESIZE)