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I mean if you run "ab" 5 times with -n 1000, it will be more accurate result if you do "ab" once with -n 5000.
"ab" will send maybe around 2000 requests when you do " -n 1000 -c 1000", after it receives the first 1000 response, it just close all connection, however, on web server side, those extra requests are still being processed, that's why the first "ab" run get better result.
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