How to run two task and open the same fd(file descriptor)

peterhuang · 05-20-2008, 11:51 PM

I want to run two or more task and open the same fd(file descriptor).
Because my program generator too many fd, it cause the performance very bad. "lsof" shows my tasks open more then 50000 files.
So I want to write a Daemon to manager my opened file. every file will be opened once . If the new task needs the file which is opened by other program, this new task just need the fd and without open again.
how can i do?

chrism01 · 05-21-2008, 01:01 AM

Why do you need to open 50K files at the same time?

peterhuang · 05-21-2008, 05:03 AM

I maintain a huge system. It has more than 2000 program and more then 100 users. Each program links with 100 files when it is running. Most of linking file is the same. When 100 users use this system and every user run more then 5 programs, it causes 100 * 5 * 100 = 50000 file opens. I hope I can have a daemon that can help me to manager those opened file, and one file will be opened only once. (If one file is opened, the new task doesn’t need open again. I can use the same fd to do IO operation.)
How can I do?