Ryan J M wrote: > Hi all, > Sometimes, the working threads occupy 100% CPU, and I just cann't > ssh login with root. my question is: Is there any solution for this > case? > I googled and found some related links, but not helpful. I'm not aware of any method under linux directly to reserve a set amount of CPU resources. You can use /etc/security/limits.conf to restrict certain amounts of resources but there is nothing there even that impacts CPU usage on a percentage basis, and of course nothing that will reserve CPU. If you can't login with root it sounds like the load on your system is likely very high, so I'd reduce the amount of working threads. There's a big difference between cpu usage being at 100% and a low number of things that are contributing to that 100% usage number, and having cpu be at 100% and many things contributing to that number. The latter will definitely have far more serious performance impact than the former in my experience. I can recall on countless occasions over the years being able to login to a system that is running at 100% cpu usage and not really have any noticeable impact on being able to login or interact with the system. nate