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diff --git a/doc/articles/speed.rst b/doc/articles/speed.rst index 9962c07f..81af5a23 100644 --- a/doc/articles/speed.rst +++ b/doc/articles/speed.rst @@ -81,6 +81,10 @@ If the background is low and/or smooth, you can use the faster ``zaef`` peak search algorithm instead of ``peakfinder8`` without compromising on the results. +The speed of ``peakfinder8`` can be improved with option ``indexamajig +--peakfinder8-fast``, which tells CrystFEL to pre-calculate some structures. +This is only possible with a static detector geometry (see below). + Choose the fastest indexing algorithms ====================================== @@ -134,6 +138,22 @@ improvement. However, the ``--push-res`` value that you use for merging must be smaller than the value used for integration. +Don't need integration results? Don't integrate! +================================================= + +If you're using CrystFEL as part of an online monitoring system, you might not +be interested in the integration results at all. Since spot prediction and +integration can take a significant amount of time, you can save a lot by +disabling them. Disable integration, but not prediction, with ``indexamajig +--integration=none``. The stream will contain predicted spot positions, but +their intensities will all be zero. Disable prediction altoghether with +``indexamajig --cell-parameters-only``. + +This is particularly important when doing "unrestricted" indexing with no +prior unit cell information. Occasional spuriously large unit cells can slow +things down a lot by producing a lot of reflections. + + Use a static detector geometry ============================== |