./conn[12]: cannot fork: too many processes

在HP Unix有两个可以限制系统最大进程数的内核参数：maxuprc(max user processes)和nproc(the number of system processes);
maxuprc只对普通用户生效，对root用户不生效，只有nproc才对root生效。

kctune 命令可以查看所有的内核参数
修改maxuprc内核参数命令.
kctune maxuprc+=500 (增加500)

[root@xxxxxxx:/#] kctune maxuprc+=500
     ==> Update the automatic 'backup' configuration first? y
       * The automatic 'backup' configuration has been updated.
       * Future operations will update the backup without prompting.
       * The requested changes have been applied to the currently
         running configuration.
Tunable            Value Expression Changes
maxuprc (before)    256 Default     Immed
         (now)       756 756

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[HP-UX] cannot fork: too many processes

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