[erlang-questions] Test the system bottlenecks

[Solomon]

I test a web server run on a 24-core server. When server get a message, it
would read/write mnesia and return a message to client. All of the mnesia
tables are ram_copies and disc_copies.
I do a stress test and found that the heighest value of cpu load is only
900%, I get I/O load by iostat and it is idle, so I guess the system
bottleneck is mnesia, but I found the reductions counter of mnesia's
process are low.
Is my guess right?
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