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show chassis routing-engine (to check CPU, temperature, uptime, average load)
show system memory
show system processess extensive (show all the process uning the CPU)
You are on your own with this. It is for reference only and in no way am I encouraging itsi use one way or another.
http://www.juniper.net/us/en/community/junos/script-automation/library/operations/cpu-usage-60/