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all I do is sending out bunch of emails and my server's load gets up to 900s, any ideas where to look?

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closed as too broad by masegaloeh, Ward, mdpc, Andrew Schulman, Jim B Apr 8 '15 at 15:16

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

How about some more detail? What load gets up to 900s? – joeqwerty Sep 30 '09 at 21:15
i use latest RHEL5 w/ latest updates and on VM nothing but sendmail – alexus Sep 30 '09 at 22:00
what software are you using to actually initiate sending messages (sendmail is your MTA, but normally you've got a script/application handling your mailing). When you start a mailing - try running 'top' and looking for the processes in 'D' or 'R' - these are the processes actually driving the load, and may give us an idea what's actually going on. (Also, how fast are you sending messages?) – epic9x Oct 1 '09 at 12:00

Load more detail needed before anyone can give you a proper answer.

What do you see in top when load average is that high? Along the top line of top's output, what do the CPU stats look like? A large amount of %us, or %wa?

How many e-mails are 'a bunch'? Are they ones produced in a batch through some automated means? What mail server software are you using on the server?

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It would help if you posted you Xen configuration file, however my immediate guess is that the dom-u was given insufficient memory. Is this HVM or paravirt? Please provide some more information.

Loads like that usually mean I/O bound processes ... so some details about your network configuration (bridge / NAT) on dom-0 would also help.

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