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SubjectRe: 99% System load
Florian Schanda <ma1flfs@bath.ac.uk> wrote:
>
> Sometimes (not allways, thats the problem, otherwise I could just avoid the
> offending command) during paralel builds (for instance kde-libs or kde-base)
> the build just stops, and I get a 99% system load.
>
> For instance, just now I have (from top):
>
> Tasks: 89 total, 5 running, 84 sleeping, 0 stopped, 0 zombie
> Cpu0 : 0.3% us, 99.7% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si
> Cpu1 : 0.3% us, 99.7% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si
> Cpu2 : 1.3% us, 98.7% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si
> Cpu3 : 1.0% us, 99.0% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si
> Mem: 2071872k total, 1220772k used, 851100k free, 48080k buffers
> Swap: 401616k total, 0k used, 401616k free, 892428k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 5197 ma1flfs 25 0 2256 884 2184 R 99.5 0.0 6:29.38 sh
> 5199 ma1flfs 25 0 2260 888 2184 R 99.5 0.0 6:28.02 sh
> 5201 ma1flfs 25 0 2260 884 2184 R 98.5 0.0 6:29.99 sh
> 5208 ma1flfs 25 0 1560 440 1404 R 98.5 0.0 6:32.03 grep

Make sure that you have enabled CONFIG_KALLSYMS, and that
/proc/sys/kernel/sysrq is set to one. Then, when it hangs, do

echo t > /proc/sysrq-trigger

or type alt-sysrq-t

Then, run

dmesg -s 1000000 > /tmp/foo

and make `foo' available.

It would help if you could make a note of the PIDs of the hung processes,
so they can be correlated with the sysrq output.

Thanks.

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