About kernel idle

[watermelonyu]

哪個 command 可以分析 kernel idle? (Tru64 5.1B)

[watermelonyu]

不懂你說的分析是要分析什麼

可以描述一下嗎?

若是指看到idle 的值的話.....

example:

#collect –i 5 –sc

# CPU SUMMARY

# USER SYS IDLE WAIT INTR SYSC CS RUNQ AVG5 AVG30 AVG60 FORK VFORK

8 73 19 0 503 54911 4322 4 5.68 6.61 6.32 13.91 0.00

# SINGLE CPU STATISTICS

# CPU USER SYS IDLE WAIT

0 6 70 24 0

1 8 76 16 0

2 8 75 16 0

3 8 72 19 0

[watermelonyu]

查 top 時, 有一 process 為 kernel idle, 似乎所耗 resource 突然有偏高現象, 導致 cpu 的 system% 超過 30% (平時在 20% 以下), 請問該如何判斷這個 kernel idle 是怎麼造成的?

[watermelonyu]

wait i/o 有增加嗎

[watermelonyu]

wait i/o 跟平常差不多

[watermelonyu]

分析的工具我是不知道

但kernel idle 增高有可能是configuration or hardware problem所導致

請至該網頁看看,是否你的現象與他相同

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=769502

[watermelonyu]

Hi Eric,



Please using the following command to trace what thread is the largest CPU loading?



# ps -em -O THREAD



See the field "WCHAN" description and CPU usage on both "user" and "system" time since it started!



Best regards,

Richard.