- SysRq: SysRq is a key combo you can hit which the kernel will respond to regardless of whatever else it is doing, unless it is completely locked up.
- Hangwatch: Hangwatch periodically polls /proc/loadavg, and echos a user-defined set of characters into /proc/sysrq-trigger if a user-defined load threshold is exceeded.
- NMI: Non-Maskable Interrupt (NMI) is a mechanism to detect system lockups. It enables the built-in kernel deadlock detector. By executing periodic NMI interrupts, the kernel can monitor whether any CPU has locked up and print out debugging messages as needed.
Tuesday, October 30, 2007
redhat hang
If your RedHat system gets really overloaded and hangs here are some things that might help:
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