Compaq AlphaServer ES40, Service Manual

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4-20 Compaq AlphaServer ES40 Service Guide
-a <action_string>
(continued)
•
? Seek to a random block offset within the
specified range of blocks. exer calls the program,
random, to “deal” each of a set of numbers once. exer
chooses a set that is a power of two and is greater
than or equal to the block range. Each call to random
results in a number that is then mapped to the set of
numbers that are in the block range and exer seeks
to that location in the filestream. Since exer starts
with the same random number seed, the set of
random numbers generated will always be over the
same set of block range numbers.
•
s Sleep for a number of milliseconds specified by
the delay qualifier. If no delay qualifier is present,
sleep for 1 millisecond. Times as reported in verbose
mode will not necessarily be accurate when this
action character is used.
•
z Zero buffer 1
•
Z Zero buffer 2
•
b Add constant to buffer 1
•
B Add constant to buffer 2
-sec <seconds> Specifies to terminate the exercise after the number of
seconds have elapsed. By default the exerciser continues
until the specified number of blocks or passcount are
processed.
-m Specifies metrics mode. At the end of the exerciser a
total throughput line is displayed.
-v Specifies verbose mode. Data read is also written to
stdout. This is not applicable on writes or compares. The
default is verbose mode off.
-delay <millisecs> Specifies the number of milliseconds to delay when s
appears as a character in the action string.