1 views collected around this technical thread.
This article explains the practical limits on how many TCP connections a Linux server or client can support, covering file‑descriptor parameters, memory consumption per socket, kernel tuning examples, and scaling calculations for large‑scale long‑connection services.
This article explains Linux redirection, the three standard streams and their file descriptors, how to adjust descriptor limits, practical redirection examples, and the fundamentals of pipes—including anonymous and named pipes, their characteristics, and typical use cases for inter‑process communication.
This guide explains how to use the Linux lsof command‑line utility to list information about files opened by processes—including regular files, directories, sockets, and pipes—while covering options for filtering by file, directory, process name, user, PID, network connections, repeat mode, and more.
This article explains how Linux kernel parameters, memory size, and file descriptor limits determine the maximum number of TCP connections a server or client can handle, provides configuration examples for increasing those limits, and discusses practical considerations such as port ranges and connection overhead.
This article explains the Linux parameters that limit the maximum number of open files and TCP connections on a server, shows how to adjust those limits with configuration examples, and discusses practical constraints such as memory, port ranges, and real‑world scaling scenarios.
This article explains why the “Too many open files” error occurs on Linux, analyzes the three related kernel parameters (fs.nr_open, nofile, and fs.file-max), shows the relevant source code, and provides step‑by‑step configuration guidance to safely increase file descriptor limits.
This article explains the true limits of concurrent TCP connections on a server, debunks common misconceptions about port numbers, details the TCP four‑tuple theory, outlines Linux file‑descriptor restrictions, shows how to tune kernel buffers with sysctl, and shares a real‑world test achieving one million active connections.
This article explains the true limits of concurrent TCP connections on a server, debunks common misconceptions about port numbers and TCP four‑tuple space, and shows how Linux file‑descriptor and socket buffer settings affect real‑world scalability, illustrated with a million‑connection experiment.
The article explains the discrepancy between the file‑handle count reported by /proc/sys/fs/file‑nr and the numbers shown by lsof, clarifying the difference between file descriptors and file handles, describing how the kernel allocates struct file objects, and showing how shared memory, mmap, and other operations can inflate handle counts unnoticed by lsof.
This article analyzes a production incident where a Java web application using Apollo configuration center encountered "Too many open files" errors, detailing the fault symptoms, root cause analysis involving Tomcat's classloader and file‑descriptor limits, and presenting remediation and preventive measures.