fopen, access and stat 執行效能的比較

fopen, access, and stat是常用來檢查檔案是否存在的c library

本篇文章就執行效能來做一個比較

檔案存在

	fopen	access	stat
time	Tue Nov 24 13:36:27 2015 Tue Nov 24 13:36:45 2015 Total time: 18s	Tue Nov 24 13:36:45 2015 Tue Nov 24 13:36:52 2015 Total time: 7s	Tue Nov 24 13:36:52 2015 Tue Nov 24 13:36:59 2015 Total time: 7s

檔案不存在

	fopen	access	stat
time	Tue Nov 24 13:38:21 2015 Tue Nov 24 13:38:34 2015 Total time: 13s	Tue Nov 24 13:38:34 2015 Tue Nov 24 13:38:41 2015 Total time: 7s	Tue Nov 24 13:38:41 2015 Tue Nov 24 13:38:48 2015 Total time: 7s

結果:

stat跟access不相上下

stat, access都比fopen快

source code download:
https://github.com/nelsonchung/nelson_sample_code_for_c/blob/master/diff_fopen_access_stat.c