[Tile-serving] [openstreetmap/mod_tile] memory consumption (#181)

[nicksparks-cgi]

I know the thread is a few months old, but thought I'd add my findings:

I'm using the `overv/openstreetmap-tile-server` Docker image (just like @msschl) (supposedly the result of the switch2osm guide) and found that I hit the aforementioned RAM issues - RAM climbs until it runs out, but never releases.

Before reading this thread (and similar threads, like [openstreetmap-tile-server/issues/27](https://github.com/Overv/openstreetmap-tile-server/issues/27) I was convinced renderd was the issue.  However, after doing some further digging and reading @stephankn post I concluded that actually what I'm seeing is the same as him - the value for RssAnon always climbed along with the RAM usage.

Following reading up on it, I disabled the JIT feature as described.  This has definitely resolved the issue - previously I could exhaust my RAM is <48 hours,  whereas now it ticks over with an almost identical memory usage and RssAnon value 5 days later.  Genuinely, many thanks for your write-up stephankn.

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