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moodlelib: moodle_request_shutdown() prints included files
If MDL_PERFINC is defined, we now print to errorlog a listing of the files included, their size, and then a total size. The total size isn't the most important metric, though it does give us a good idea of how much PHP the PHP engine is parsing for us. The main cost is still in the seeks involved. Even when using precompilers -- our best-case scenario -- each include or require forces at least 2 stat()s to compare timestamps in the php file vs the precompiled file. If the working set fits in buffers we are fine, but our 60+ stat() calls per page is quite a bit.
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