I mean by original wal segments to files generated in pg_xlog, yes. I have to 0 the parameter wal_keep_segments. They are being generated with 16MB of size and they are being rotated. What parameter controls how many files can be generated? Or will it grow indefinitely?
checkpoint_segments. A maximum of (3 * checkpoint_segments + 1) WAL segments can generated. This can be more though as this is a soft limit, but once this limit is reached server will remove WAL segments instead of keeping them. Per the docs: http://www.postgresql.org/docs/9.3/static/wal-configuration.html
