-o denotes number of outstanding requests per thread, such as -o4 for four requests or -o2 for two results.-t denotes number of threads that will be run at the same time, such as -t2 for two threads or -t6 for six threads.This helps you test for either random file access (often a bunch of small files) or sequential file access (often one large file that’s read or written all at once). Specify -r for random access or -s for sequential. -r or -s determines whether the test uses either random access or sequential operations.Omitting the -w switch or entering -w0 will perform 0% write operations and thus 100% read operations. Entering -w100 will perform 100% write operations. For example, entering -w40 will perform 40% write operations and thus 60% read operations. -w denotes percentage of write and read operations.
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