[geotk] [JIRA] Created: (GEOTK-43) MosaicImageReader should read a
few tiles concurrently for the same image
Martin Desruisseaux (JIRA)
jira at geomatys.com
Wed Sep 23 07:35:47 EDT 2009
MosaicImageReader should read a few tiles concurrently for the same image
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Key: GEOTK-43
URL: http://jira.geotoolkit.org/browse/GEOTK-43
Project: Geotoolkit
Issue Type: Improvement
Components: Coverage
Affects Versions: 3.04
Reporter: Martin Desruisseaux
Assignee: Martin Desruisseaux
Priority: Minor
Fix For: 3.05
{{MosaicImageReader}} reads every tiles in a single thread. Experience suggested that reading files concurrently (using multi-threading) during intensive disk I/O often reduce the performance because of the increased amount of disk seeks (note that this does not apply to operations that are more CPU bounds than I/O bounds, like *writing* images in a compressed format. Reading image is usually less CPU intensive than writing them). However the advent of SSD (Solid State Disks) changes the picture, since seeks is no longer a problem with SSD. Even in classical hard drive technology, raid disks also reduce the cost of reading 2 files in same time.
Consequently the performance of {{MosaicImageReader}} could be improved by reading a few tiles concurrently for the same image.
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