Some small tools writen by me

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1.iodisk
  It's a small program that performs disk I/O performance test,and demonstrates:
  a.normal read() vs mmap()
  b.O_SYNC vs O_DIRECT vs sync() vs fsync() vs fdatasync()
2.elftools
  I'm not sure what I will do about ELF, this is just a beginning.
2.1  elf_size
	Calculating the size occupied by the giving elf
	Warning: This algorithm maybe is wrong when not linking with GNU ld.
3.algorithm
3.1 GCD calculated by Euclidean algorithm
3.2 KMP String Search algorithm