Linux Process Management Concepts

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Internal

Process

Maximum Number of Processes Allowed on the System

cat /proc/sys/kernel/pid_max

or

sysctl kernel.pid_max

For more details, see sysctl.

To get the actual number of processes present in the system, see /proc/stat.

Maximum Number of Processes Available to a Single User

The current value can be read and set with ulimit -u.

For Java applications, this setting limits the number of threads a JVM can create, and it can cause the JVM to throw "java.lang.OutOfMemoryError: unable to create new native thread" exceptions when that limit is reached. For more details see

Java Threads and Linux Processes