[Tile-serving] [openstreetmap/mod_tile] CPU/IO not fully utilized when under heavy load (Issue #333)

[Paul Norman]

I attached gdb and got some useful information with a backtrace of all the threads. Of the 81 threads, 61 of them were at `futex_wait` within `mapnik::freetype_engine::create_face_impl`, inside the rendering of an image. 9 threads were doing other Mapnik work, 4 were in `__pthread_cond_wait_common` with no Mapnik calls, 2 were within PQgetResult, and the last two were overall renderd threads.

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