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I am using cp command to transfer file from /home to /var directory, but what I see is even after cp command return, data is being still copied from kernel buffer to disk in the background for sometime.
Here I want to calculate the exact file transfer time taken using cp command.
How to calculate? Please help me if anyone has clear idea.
Actually I want to calculate file transfer time in Linux to benchmark memory driver performance. say for ex. memory to disk.
I tried following commands to measure time,
Eg.
1st command,
$time cp /var/file1 /tmp/
2nd command,
$time cp /var/file1 /tmp/;sync
In 1st command, I found cp command is not giving exact file transfer time, because I could see file is still being copied after cp returns.
Second command solves the above problem, because sync synchronize data. Here problem is cp command runs first and outputs time and calls sync, so still time gives same value.
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