[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

                 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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