Messages in this thread | | | From | "David Schwartz" <> | Subject | RE: Increasing the FD_SETSIZE | Date | Mon, 9 Apr 2001 19:41:35 -0700 |
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> I am having trouble with increasing the file descriptor size for my > application - it opens several files for each client session (and needs > to keep them open as long as the session is active, which can be upto 3 > hours long). What I see from the application is "open failed in > FileStreamReader::setupFile: Too many open files". > > I have bumped up /proc/sys/fs/file-max to 16K, but I am failing at 2638 > (cat /proc/sys/fs/file-max returns "2638 97 16384") when the number of > files my app opened reached 1023. > > There is a comment in /usr/include/linux/posix_types.h regarding > __FD_SETSIZE being set to 1024. How can I increase this value?
You are tinkering with the wrong value. FD_SETSIZE affects fd_sets used in the 'select' system call. If you don't use select (and you shouldn't) it's not an issue.
Also, tampering with the system-wide limits is the wrong approach too. There is no problem in the kernel for you to fix.
What you are hitting is a per-process resource limit. Read the man pages on 'setrlimit' or the bash help on 'ulimit'.
DS
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