Its very important factor to know the IO benchmarks of your machine to give performance estimations with new tools or to observe the performance impact after upgrade activities. Here is a command useful for this.
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dd if=/dev/zero of=/tmp/output bs=8k count=100; rm -f /tmp/output
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if - input file
of - output file
bs - read this many bytes at a time
count - copy only this many input blocks from if to of
Above command will read 8KB blocks from /dev/zero and write to /tmp/output and repeat this fr 100 times. Make sure that you remove
NOTE: of file ("/tmp/output" in this case) after testing.
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dd if=/dev/zero of=/tmp/output bs=8k count=100; rm -f /tmp/output
=========
if - input file
of - output file
bs - read this many bytes at a time
count - copy only this many input blocks from if to of
Above command will read 8KB blocks from /dev/zero and write to /tmp/output and repeat this fr 100 times. Make sure that you remove
NOTE: of file ("/tmp/output" in this case) after testing.