ALIGNOF_BUFFER BITS_PER_BYTE DEFAULT_BACKEND_FLUSH_AFTER DEFAULT_BGWRITER_FLUSH_AFTER DEFAULT_CHECKPOINT_FLUSH_AFTER DEFAULT_EVENT_SOURCE DEFAULT_PGSOCKET_DIR DEFAULT_XLOG_SEG_SIZE FMGR_ABI_EXTRA FUNC_MAX_ARGS HAVE_WORKING_LINK INDEX_MAX_KEYS MAX_RANDOM_VALUE MAXPGPATH NAMEDATALEN NUM_ATOMICS_SEMAPHORES NUM_SPINLOCK_SEMAPHORES PARTITION_MAX_KEYS PG_CACHE_LINE_SIZE PG_SOMAXCONN TRACE_SORT WRITEBACK_MAX_PENDING_FLUSHES

DEFAULT_XLOG_SEG_SIZE #define DEFAULT_XLOG_SEG_SIZE   (16*1024*1024)