#define GIB(x) (x * 1024 * 1024 * 1024ull)
#define GB(x) (x * 1000 * 1000 * 1000ull)

#define KEY_SIZE 10
#define VALUE_SIZE 90
#define INDEX_SIZE 5
#define BLOCK_SIZE 4096         // Need not be equal to physical block size
#define READ_BUFFER_SIZE GB(10)  // RUNs are equal to READ buffer size
#define WRITE_BUFFER_SIZE GB(10) // WB can be < RB where multiple write cycles take place.
#define READ_SIZE 1              // in BLOCK_SIZE
#define WRITE_SIZE 1
////////////////////////////////////////////////////////////////////

#define RECORD_SIZE (KEY_SIZE + VALUE_SIZE)
#define REC_PER_BLOCK (BLOCK_SIZE / RECORD_SIZE)
#define READ_BUFFER_COUNT (READ_BUFFER_SIZE / BLOCK_SIZE)
#define WRITE_BUFFER_COUNT (WRITE_BUFFER_SIZE / BLOCK_SIZE)
#define REC_PER_WRITE_BUFFER ((WRITE_BUFFER_COUNT * BLOCK_SIZE) / RECORD_SIZE)
#define REC_PER_READ_BUFFER ((READ_BUFFER_COUNT * BLOCK_SIZE) / RECORD_SIZE)