How to capture good out put from strace command?

Execute following command :

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#touch /tmp/strace_op
#strace -s 128 -fvTttto /tmp/strace_op command
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Now analysis the file /tmp/strace_op. Note that time stamp has been captured here. So, you can check which system call took much time. If any command takes much time to response you can do strace to that command and analysis the output.

Thanks.