radixmmap:Mmap基数排序文件按每行的固定长度前缀 源码

radixmmap:按内存中的前缀对大量文件进行排序 在此示例中,我们将按时间顺序对文件进行排序,其中每行的前19个字节假定为RFC3339日期。 范例1: > cat /tmp/test 2011-01-10T15:30:45Z,bla 2009-01-10T15:30:47Z,abc 2009-01-10T15:30:45Z,def > ./radixmmap /tmp/test 2009-01-10T15:30:45Z,def 2009-01-10T15:30:47Z,abc 2011-01-10T15:30:45Z,bla 示例2,多个带头的csv文件: > cat /tmp/a /tmp/b date,string 2009-01-10T15:30:45Z,def 2009-01-10T15:30:47Z,abc 2011-01-10T15:30:45Z,bla date