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(Xdebug Profiler) Why are there two cachegrind recordsdata generated for one web page?

Once I allow xdebug profiler, open a web page in admin, it generates two cachegrind recordsdata with virtually similar title

cachegrind.out.1498219635_761795.crown__minilio_wp-admin_edit_php
cachegrind.out.1498219639_141988.crown__minilio_wp-admin_edit_php

The output title is outlined as

xdebug.profiler_output_name = "cachegrind.out.%u.%H_percentR"

I attempted one other web page, obtained the identical outcome.

Why is that? Which file ought to I evaluation?