Fix “Too Many Open Files” on Linux: Raise File Descriptor Limits
When a performance test that simulates 100 concurrent HTTP GET requests triggers a “Too many open files” error, the article explains why the default 1024 file‑descriptor limit causes the failure and provides step‑by‑step commands to permanently increase the limit on Linux systems.
While performing a performance test that simulates 100 concurrent HTTP GET requests, the program threw a “Too many open files” exception.
The error is caused by the default limit of 1024 file descriptors per process on most Linux systems, which can be checked with ulimit -n.
Changing the limit with ulimit -n 65535 only affects the current shell and does not persist for other users.
To permanently raise the limit, edit /etc/security/limits.conf and add a line such as: * - nofile 65535 Then ensure the PAM module is loaded by adding the following line to /etc/pam.d/login: session required /lib/security/pam_limits.so After saving the files, log out and log back in so the new limits take effect for the session.
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