I/O performance measurement and load generation tool

 Spew is used to measure I/O performance of character devices, block
 devices, and regular files. It can also be used to generate high I/O loads
 to stress systems while verifying data integrity.
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 Spew is easy to use and is flexible. No configuration files or
 complicated client/server configurations are needed. Spew also generates
 its own data patterns that are designed to make it easy to find and debug
 data integrity problems.