本文介绍Linux 线程数限制，只要在sysctl.conf和limits.conf两个配置文件里。另外在redhat 7.5+和suse 12，又增加了TaskMax限制。
目录导航
检查方法
cat /proc/sys/kernel/threads-max
cat /proc/sys/vm/max_map_count
cat /etc/security/limits.d/90-nproc.conf
cat /proc/sys/kernel/pid_max也可以
[root@localhost ~]# sysctl -a | grep -i thread
kernel.threads-max = 62300
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.enp0s3.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
sysctl: reading key "net.ipv6.conf.virbr0.stable_secret"
sysctl: reading key "net.ipv6.conf.virbr0-nic.stable_secret"
vm.nr_pdflush_threads = 0
[root@localhost ~]#
[root@localhost ~]# sysctl -a | grep -i pid
kernel.cad_pid = 1
kernel.core_uses_pid = 1
kernel.ns_last_pid = 4786
kernel.pid_max = 32768
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.enp0s3.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
sysctl: reading key "net.ipv6.conf.virbr0.stable_secret"
sysctl: reading key "net.ipv6.conf.virbr0-nic.stable_secret"
user.max_pid_namespaces = 31150
[root@localhost ~]#
[root@localhost ~]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 31150
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 31150
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[root@localhost ~]#
修改方法
vi /etc/sysctl.conf
vi /etc/security/limits.conf
vi etc/security/limits.d/90-nproc.conf 参考
Suse 12和redhat 7.5+ 修改任务数TasksMax，DefaultTasksMax，UserTasksMax等全局、用户的配置