ZZ Linux Max threads limit and current thread count query

Linux Max threads limit and current thread count query

[Date: 2015-01-04]

Source: Linux Community zhangming

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Linux Max threads limit and current thread count query

1, summary system limitations are:

/proc/sys/kernel/pid_max #查系统支持的最大线程数, usually very large, equivalent to the theoretical value

/proc/sys/kernel/thread-max

Max_user_process (ulimit-u) #系统限制某用户下最多可以运行多少进程或线程

/proc/sys/vm/max_map_count

Hardware memory Size

2. The Java Virtual machine itself limits:

-xms #intial Java Heap Size

-xmx #maximum Java Heap Size

-XSS #the stack size for each thread

3. Query the current number of threads or processes of a program

Pstree-p ' Ps-e | grep java | awk ' {print '} ' | Wc-l

Or

Pstree-p 3660 | Wc-l

4. Query the current number of threads or processes used by the entire system

Pstree-p | Wc-l

1, Cat/proc/${pid}/status

2, Pstree-p ${pid}

3, Top-p ${pid} and press H or direct input top-bh-d 3-p ${pid}

Top-h

The handbook says:-h:threads Toggle

Add this option to start a top,top line to display a thread. Otherwise, it displays a process one line.

4, PS XH

The manual says: H Show Threads as if they were processes

This allows you to view all the threads that exist.

5. PS-MP <PID>

The manual says: M Show Threads after processes

This allows you to see the number of threads from a process.

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ZZ Linux Max threads limit and current thread count query