要检索它:

cat /proc/sys/kernel/threads-max

设置方法:

echo 123456789 | sudo tee -a /proc/sys/kernel/threads-max

123456789 = #线程

要检索它:

cat /proc/sys/kernel/threads-max

设置方法:

echo 123456789 | sudo tee -a /proc/sys/kernel/threads-max

123456789 = #线程

也许这并不重要。将算法设计为使用固定数量的线程(例如，如果有4或8个处理器，则使用4或8个线程)，将获得更好的性能。您可以使用工作队列、异步IO或类似libevent的东西来实现这一点。

Linux对每个进程没有单独的线程限制，只是对系统上进程总数的限制(线程本质上只是在Linux上具有共享地址空间的进程)，您可以像这样查看:

cat /proc/sys/kernel/threads-max

默认为内存页数/4。你可以这样增加:

echo 100000 > /proc/sys/kernel/threads-max

对于单个用户可以创建的进程(以及线程)的数量也有限制，有关这些限制的详细信息，请参阅ulimit/getrlimit。

linux上合适的100k线程:

ulimit -s  256
ulimit -i  120000
echo 120000 > /proc/sys/kernel/threads-max
echo 600000 > /proc/sys/vm/max_map_count
echo 200000 > /proc/sys/kernel/pid_max 

 ./100k-pthread-create-app

来自@Thomas的2018年更新，关于systemd系统:

/etc/systemd/logind.conf: UserTasksMax=100000

Yes, to increase the threads number you need to increase the virtual memory or decrease the stack size. In Raspberry Pi I didn’t find a way to increase the virtual memory, if a decrease the stack size from default 8MB to 1MB It is possibly get more than 1000 threads per process but decrease the stack size with the “ulimit -s” command make this for all threads. So, my solution was use “pthread_t” instance “thread class” because the pthread_t let me set the stack size per each thread. Finally, I am available to archive more than 1000 threads per process in Raspberry Pi each one with 1MB of stack.