Tracking load - howto?

Can anyone recommend a good free utility that can be used to record/track load averages (like uptime output) every minute or so?

The utility should also have the ability to produce statistics, either in graph format or plain text. The server is not running web software, or php.

I'm basically looking for the ability to see load averages over period of 1 hour to 24 hours to 1 week.. so we can find patterns of usage.

Thanks.

BTW - This server is a db server only. There is no web server software, php or anything else besides perl. The operating system is IRIX.

 

 

 

 

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