hummeltech left a comment (openstreetmap/mod_tile#501)
Thank you very much for the comprehensive write-up for this issue.
I have implemented the changes you requested:
Before:
```shell
> build/src/render_list --all --config build/tests/conf/file/renderd.conf
> --force --map default --num-threads 4 \
--min-zoom 0 --max-zoom 8 \
--min-lon -125.0 --max-lon -66.9 --min-lat 24.4 --max-lat 49.4
** INFO: 07:29:24.402: Started render_list with the following options:
** INFO: 07:29:24.403: --config = 'build/tests/conf/file/renderd.conf'
(user-specified)
** INFO: 07:29:24.403: --map = 'default' (user-specified)
** INFO: 07:29:24.403: --max-load = '16' (default)
** INFO: 07:29:24.403: --max-zoom = '8' (user-specified/from config)
** INFO: 07:29:24.403: --min-zoom = '0' (user-specified/from config)
** INFO: 07:29:24.403: --num-threads = '4' (user-specified/from config)
** INFO: 07:29:24.403: --socket = 'build/tests/run/file/renderd0.sock'
(user-specified/from config)
** INFO: 07:29:24.403: --tile-dir = 'build/tests/tiles/file'
(user-specified/from config)
** Message: 07:29:24.403: Starting 4 rendering threads
** Message: 07:29:24.403: Rendering all tiles from zoom 0 to zoom 8
** Message: 07:29:24.403: Rendering all tiles for zoom 0 from (0, 0) to (0, 0)
** Message: 07:29:24.403: Rendering all tiles for zoom 1 from (0, 0) to (0, 0)
** Message: 07:29:24.403: Rendering all tiles for zoom 2 from (0, 1) to (0, 1)
** Message: 07:29:24.403: Rendering all tiles for zoom 3 from (1, 2) to (1, 3)
** Message: 07:29:24.403: Rendering all tiles for zoom 4 from (2, 5) to (4, 6)
** Message: 07:29:24.403: Rendering all tiles for zoom 5 from (4, 10) to (9, 13)
** Message: 07:29:24.403: Rendering all tiles for zoom 6 from (9, 21) to (19,
27)
** Message: 07:29:24.403: Rendering all tiles for zoom 7 from (19, 43) to (39,
55)
** Message: 07:29:24.475: Rendering all tiles for zoom 8 from (39, 87) to (79,
110)
** Message: 07:29:29.454: Waiting for rendering threads to finish
** Message: 07:29:31.455: Total for all tiles rendered
** Message: 07:29:31.455: Metatiles rendered:
** Message: 07:29:31.455: 32 in 7.05 seconds (4.54/s)
** Message: 07:29:31.455: Total tiles rendered:
** Message: 07:29:31.455: 2048 in 7.05 seconds (290.40/s)
** Message: 07:29:31.455: Total tiles handled:
** Message: 07:29:31.455: 32 in 7.05 seconds (4.54/s)
```
After applying the fix for "cause 1":
```shell
> build/src/render_list --all --config build/tests/conf/file/renderd.conf
> --force --map default --num-threads 4 \
--min-zoom 0 --max-zoom 8 \
--min-lon -125.0 --max-lon -66.9 --min-lat 24.4 --max-lat 49.4
** INFO: 20:51:33.251: Started render_list with the following options:
** INFO: 20:51:33.251: --config = 'build/tests/conf/file/renderd.conf'
(user-specified)
** INFO: 20:51:33.251: --map = 'default' (user-specified)
** INFO: 20:51:33.251: --max-load = '16' (default)
** INFO: 20:51:33.251: --max-zoom = '8' (user-specified/from config)
** INFO: 20:51:33.251: --min-zoom = '0' (user-specified/from config)
** INFO: 20:51:33.251: --num-threads = '4' (user-specified/from config)
** INFO: 20:51:33.251: --socket = 'build/tests/run/file/renderd0.sock'
(user-specified/from config)
** INFO: 20:51:33.251: --tile-dir = 'build/tests/tiles/file'
(user-specified/from config)
** Message: 20:51:33.251: Starting 4 rendering threads
** Message: 20:51:33.251: Rendering all tiles from zoom 0 to zoom 8
** Message: 20:51:33.251: Rendering all tiles for zoom 0 from (0, 0) to (0, 0)
** Message: 20:51:33.251: Rendering all tiles for zoom 1 from (0, 0) to (0, 0)
** Message: 20:51:33.251: Rendering all tiles for zoom 2 from (0, 1) to (0, 1)
** Message: 20:51:33.251: Rendering all tiles for zoom 3 from (1, 2) to (1, 3)
** Message: 20:51:33.251: Rendering all tiles for zoom 4 from (2, 5) to (4, 6)
** Message: 20:51:33.251: Rendering all tiles for zoom 5 from (4, 10) to (9, 13)
** Message: 20:51:33.251: Rendering all tiles for zoom 6 from (9, 21) to (19,
27)
** Message: 20:51:33.281: Rendering all tiles for zoom 7 from (19, 43) to (39,
55)
** Message: 20:51:34.309: Rendering all tiles for zoom 8 from (39, 87) to (79,
110)
** Message: 20:51:40.311: Waiting for rendering threads to finish
** Message: 20:51:42.311: Total for all tiles rendered
** Message: 20:51:42.311: Metatiles rendered:
** Message: 20:51:42.311: 41 in 9.06 seconds (4.53/s)
** Message: 20:51:42.311: Total tiles rendered:
** Message: 20:51:42.311: 2624 in 9.06 seconds (289.62/s)
** Message: 20:51:42.311: Total tiles handled:
** Message: 20:51:42.311: 41 in 9.06 seconds (4.53/s)
```
After applying the fix for "cause 2":
```shell
> build/src/render_list --all --config build/tests/conf/file/renderd.conf
> --force --map default --num-threads 4 \
--min-zoom 0 --max-zoom 8 \
--min-lon -125.0 --max-lon -66.9 --min-lat 24.4 --max-lat 49.4
** INFO: 20:49:27.495: Started render_list with the following options:
** INFO: 20:49:27.495: --config = 'build/tests/conf/file/renderd.conf'
(user-specified)
** INFO: 20:49:27.495: --map = 'default' (user-specified)
** INFO: 20:49:27.495: --max-load = '16' (default)
** INFO: 20:49:27.495: --max-zoom = '8' (user-specified/from config)
** INFO: 20:49:27.495: --min-zoom = '0' (user-specified/from config)
** INFO: 20:49:27.495: --num-threads = '4' (user-specified/from config)
** INFO: 20:49:27.495: --socket = 'build/tests/run/file/renderd0.sock'
(user-specified/from config)
** INFO: 20:49:27.495: --tile-dir = 'build/tests/tiles/file'
(user-specified/from config)
** Message: 20:49:27.495: Starting 4 rendering threads
** Message: 20:49:27.495: Rendering all tiles from zoom 0 to zoom 8
** Message: 20:49:27.495: Rendering all tiles for zoom 0 from (0, 0) to (0, 0)
** Message: 20:49:27.495: Rendering all tiles for zoom 1 from (0, 0) to (0, 0)
** Message: 20:49:27.495: Rendering all tiles for zoom 2 from (0, 1) to (1, 1)
** Message: 20:49:27.495: Rendering all tiles for zoom 3 from (1, 2) to (2, 3)
** Message: 20:49:27.495: Rendering all tiles for zoom 4 from (2, 5) to (5, 6)
** Message: 20:49:27.495: Rendering all tiles for zoom 5 from (4, 10) to (10,
13)
** Message: 20:49:27.495: Rendering all tiles for zoom 6 from (9, 21) to (20,
27)
** Message: 20:49:27.526: Rendering all tiles for zoom 7 from (19, 43) to (40,
55)
** Message: 20:49:28.565: Rendering all tiles for zoom 8 from (39, 87) to (80,
110)
** Message: 20:49:35.567: Waiting for rendering threads to finish
** Message: 20:49:37.567: Total for all tiles rendered
** Message: 20:49:37.567: Metatiles rendered:
** Message: 20:49:37.567: 47 in 10.07 seconds (4.67/s)
** Message: 20:49:37.567: Total tiles rendered:
** Message: 20:49:37.567: 3008 in 10.07 seconds (298.64/s)
** Message: 20:49:37.567: Total tiles handled:
** Message: 20:49:37.567: 47 in 10.07 seconds (4.67/s)
```
As well as included some debug messaging to indicate what is being enqueued.
```
** Message: 09:20:42.038: Rendering all tiles from zoom 0 to zoom 8
** Message: 09:20:42.038: Rendering all tiles for zoom 0 from (0, 0) to (0, 0)
** Message: 09:20:42.038: Rendering all tiles for zoom 1 from (0, 0) to (0, 0)
** Message: 09:20:42.038: Rendering all tiles for zoom 2 from (0, 1) to (1, 1)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=0
y=0 z=0)
** Message: 09:20:42.038: Rendering all tiles for zoom 3 from (1, 2) to (2, 3)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=0
y=0 z=1)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=0
y=0 z=2)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=0
y=0 z=3)
** Message: 09:20:42.038: Rendering all tiles for zoom 4 from (2, 5) to (5, 6)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=0
y=0 z=4)
** Message: 09:20:42.038: Rendering all tiles for zoom 5 from (4, 10) to (10,
13)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=0
y=8 z=5)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=8
y=8 z=5)
** Message: 09:20:42.038: Rendering all tiles for zoom 6 from (9, 21) to (20,
27)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=8
y=16 z=6)
** (process:188843): DEBUG: 09:20:42.038: Enqueueing tile (xmlname=default x=8
y=24 z=6)
** (process:188843): DEBUG: 09:20:42.055: Enqueueing tile (xmlname=default x=16
y=16 z=6)
** (process:188843): DEBUG: 09:20:42.058: Enqueueing tile (xmlname=default x=16
y=24 z=6)
** Message: 09:20:42.067: Rendering all tiles for zoom 7 from (19, 43) to (40,
55)
** (process:188843): DEBUG: 09:20:42.067: Enqueueing tile (xmlname=default x=16
y=40 z=7)
** (process:188843): DEBUG: 09:20:42.086: Enqueueing tile (xmlname=default x=16
y=48 z=7)
** (process:188843): DEBUG: 09:20:42.094: Enqueueing tile (xmlname=default x=24
y=40 z=7)
** (process:188843): DEBUG: 09:20:42.106: Enqueueing tile (xmlname=default x=24
y=48 z=7)
** (process:188843): DEBUG: 09:20:42.106: Enqueueing tile (xmlname=default x=32
y=40 z=7)
** (process:188843): DEBUG: 09:20:43.086: Enqueueing tile (xmlname=default x=32
y=48 z=7)
** (process:188843): DEBUG: 09:20:43.094: Enqueueing tile (xmlname=default x=40
y=40 z=7)
** (process:188843): DEBUG: 09:20:43.106: Enqueueing tile (xmlname=default x=40
y=48 z=7)
** Message: 09:20:43.106: Rendering all tiles for zoom 8 from (39, 87) to (80,
110)
** (process:188843): DEBUG: 09:20:43.106: Enqueueing tile (xmlname=default x=32
y=80 z=8)
** (process:188843): DEBUG: 09:20:44.087: Enqueueing tile (xmlname=default x=32
y=88 z=8)
** (process:188843): DEBUG: 09:20:44.095: Enqueueing tile (xmlname=default x=32
y=96 z=8)
** (process:188843): DEBUG: 09:20:44.106: Enqueueing tile (xmlname=default x=32
y=104 z=8)
** (process:188843): DEBUG: 09:20:44.106: Enqueueing tile (xmlname=default x=40
y=80 z=8)
** (process:188843): DEBUG: 09:20:45.087: Enqueueing tile (xmlname=default x=40
y=88 z=8)
** (process:188843): DEBUG: 09:20:45.095: Enqueueing tile (xmlname=default x=40
y=96 z=8)
** (process:188843): DEBUG: 09:20:45.106: Enqueueing tile (xmlname=default x=40
y=104 z=8)
** (process:188843): DEBUG: 09:20:45.106: Enqueueing tile (xmlname=default x=48
y=80 z=8)
** (process:188843): DEBUG: 09:20:46.087: Enqueueing tile (xmlname=default x=48
y=88 z=8)
** (process:188843): DEBUG: 09:20:46.095: Enqueueing tile (xmlname=default x=48
y=96 z=8)
** (process:188843): DEBUG: 09:20:46.107: Enqueueing tile (xmlname=default x=48
y=104 z=8)
** (process:188843): DEBUG: 09:20:46.107: Enqueueing tile (xmlname=default x=56
y=80 z=8)
** (process:188843): DEBUG: 09:20:47.088: Enqueueing tile (xmlname=default x=56
y=88 z=8)
** (process:188843): DEBUG: 09:20:47.096: Enqueueing tile (xmlname=default x=56
y=96 z=8)
** (process:188843): DEBUG: 09:20:47.107: Enqueueing tile (xmlname=default x=56
y=104 z=8)
** (process:188843): DEBUG: 09:20:47.107: Enqueueing tile (xmlname=default x=64
y=80 z=8)
** (process:188843): DEBUG: 09:20:48.088: Enqueueing tile (xmlname=default x=64
y=88 z=8)
** (process:188843): DEBUG: 09:20:48.096: Enqueueing tile (xmlname=default x=64
y=96 z=8)
** (process:188843): DEBUG: 09:20:48.107: Enqueueing tile (xmlname=default x=64
y=104 z=8)
** (process:188843): DEBUG: 09:20:48.107: Enqueueing tile (xmlname=default x=72
y=80 z=8)
** (process:188843): DEBUG: 09:20:49.088: Enqueueing tile (xmlname=default x=72
y=88 z=8)
** (process:188843): DEBUG: 09:20:49.096: Enqueueing tile (xmlname=default x=72
y=96 z=8)
** (process:188843): DEBUG: 09:20:49.107: Enqueueing tile (xmlname=default x=72
y=104 z=8)
** (process:188843): DEBUG: 09:20:49.107: Enqueueing tile (xmlname=default x=80
y=80 z=8)
** (process:188843): DEBUG: 09:20:50.088: Enqueueing tile (xmlname=default x=80
y=88 z=8)
** (process:188843): DEBUG: 09:20:50.096: Enqueueing tile (xmlname=default x=80
y=96 z=8)
** (process:188843): DEBUG: 09:20:50.108: Enqueueing tile (xmlname=default x=80
y=104 z=8)
```
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