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Make raster tile renderer pool sizes configurable

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This commit is contained in:
Osmo Salomaa 2017-10-01 18:40:16 +03:00
parent ac948b6dee
commit 89878015bb
2 changed files with 29 additions and 11 deletions
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21
docs/config.rst
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@ -95,6 +95,27 @@ Maximum image side length to be allowed to be rendered (including scale factor).
Be careful when changing this value since there are hardware limits that need to be considered.
Default is ``2048``.
``minRendererPoolSizes``
------------------------
Minimum amount of raster tile renderers per scale factor.
The value is an array: the first element is the minimum amount of renderers for scale factor one, the second for scale factor two and so on.
If the array has less elements than ``maxScaleFactor``, then the last element is used for all remaining scale factors as well.
Selecting renderer pool sizes is a trade-off between memory use and speed.
A reasonable value will depend on your hardware and your amount of styles and scale factors.
If you have plenty of memory, you'll want to set this equal to ``maxRendererPoolSizes`` to avoid increased latency due to renderer destruction and recreation.
If you need to conserve memory, you'll want something lower than ``maxRendererPoolSizes``, possibly allocating more renderers to scale factors that are more common.
Default is ``[8, 4, 2]``.
``maxRendererPoolSizes``
------------------------
Maximum amount of raster tile renderers per scale factor.
The value and considerations are similar to ``minRendererPoolSizes`` above.
If you have plenty of memory, try setting these equal to or slightly above your processor count, e.g. if you have four processors, try a value of ``[6]``.
If you need to conserve memory, try lower values for scale factors that are less common.
Default is ``[16, 8, 4]``.
``watermark``
-----------

19
src/serve_rendered.js
View file

@ -344,18 +344,15 @@ module.exports = function(options, repo, params, id, dataResolver) {
});
var renderersReadyPromise = Promise.all(queue).then(function() {
// TODO: make pool sizes configurable
// standard and @2x tiles are much more usual -> default to larger pools
var minPoolSizes = options.minRendererPoolSizes || [8, 4, 2];
var maxPoolSizes = options.maxRendererPoolSizes || [16, 8, 4];
for (var s = 1; s <= maxScaleFactor; s++) {
var minPoolSize = 2;
// standard and @2x tiles are much more usual -> create larger pools
if (s <= 2) {
minPoolSize *= 2;
if (s <= 1) {
minPoolSize *= 2;
}
}
map.renderers[s] = createPool(s, minPoolSize, 2 * minPoolSize);
var i = Math.min(minPoolSizes.length - 1, s - 1);
var j = Math.min(maxPoolSizes.length - 1, s - 1);
var minPoolSize = minPoolSizes[i];
var maxPoolSize = Math.max(minPoolSize, maxPoolSizes[j]);
map.renderers[s] = createPool(s, minPoolSize, maxPoolSize);
}
});