[Tile-serving] [openstreetmap/mod_tile] Time spent per tile changes to 4.2 seconds when there is a queue (Issue #333)

[Paul Norman]

We did some debugging on piasa today.

Increasing QMAX to 256 had no impact. Increasing REQ_LIMIT and DIRTY_LIMIT to 256 and 8000 had no impact. The following patchset had no impact
[download.compton.nu_tmp_queue-concurrency.patch.txt](https://github.com/openstreetmap/mod_tile/files/12652297/download.compton.nu_tmp_queue-concurrency.patch.txt). 
The testing with the patchset and with the REQ_LIMIT and DIRTY_LIMIT changes was not *identical* to the previous testing, because it was built with march=native.

Running for longer established that the spikes of working at 100% happen every 8.4 minutes. In tests on the 18th, they were happening 7.25 minutes, and on the 15th, every 7.5 minutes.


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