MIDX examples

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Two overlapping 2kbit1

<dataset typename='IdxMultipleDataset'>

  <dataset url='file://$(CurrentFileDirectory)/../2kbit1/zip/rowmajor/visus.idx' name='first'>
    <M><translate x='0' y='0' z='0'/></M>
  </dataset>

  <dataset url='file://$(CurrentFileDirectory)/../2kbit1/zip/rowmajor/visus.idx' name='second'>
    <M><translate x='0' y='0' z='0'/></M>
  </dataset>
  
</dataset>

Two visible males side by side:

<dataset typename='IdxMultipleDataset'>

  <dataset url='file://$(CurrentFileDirectory)/../male/visus.idx' name='first'>
    <M>
      <translate x='0' y='0' z='0'/>
      <scale     x='1' y='1' z='3'/>
    </M>
  </dataset>

  <dataset url='file://$(CurrentFileDirectory)/../male/visus.idx' name='second'>
    <M>
      <translate x='2048' y='0' z='0'/>
      <scale     x='1'    y='1' z='3'/>
    </M>
  </dataset>
  
</dataset>

2kbit1 overlapping Borg?time=13

<dataset typename='IdxMultipleDataset'>

  <dataset url='file://$(CurrentFileDirectory)/../2kbit1/zip/rowmajor/visus.idx' name='first'>
    <M><translate x='0' y='0' z='0'/></M>
  </dataset>

  <dataset url='file://$(CurrentFileDirectory)/../borg/visus.idx?time=13' name='second'>
    <M><translate x='0' y='0' z='0'/></M>
  </dataset>
  
</dataset>

Blend David timesteps

<dataset typename='IdxMultipleDataset'>
  <dataset url='file://$(CurrentFileDirectory)/../david_subsampled/visus.idx?time=0' name='0' />
  <dataset url='file://$(CurrentFileDirectory)/../david_subsampled/visus.idx?time=1' name='1' />
  <dataset url='file://$(CurrentFileDirectory)/../david_subsampled/visus.idx?time=2' name='2' />
  <dataset url='file://$(CurrentFileDirectory)/../david_subsampled/visus.idx?time=3' name='3' />
</dataset>

Local MIDX. No caching

<dataset name="Example" url="file://./docs/examples/midx/visus.midx">
  <access name="MultipleAccess" type="MultipleAccess">
    <A type='disk' chmod='r' url='file://./docs/examples/midx/A/visus.idx' />
    <B type='disk' chmod='r' url='file://./docs/examples/midx/B/visus.idx' />
    <C type='disk' chmod='r' url='file://./docs/examples/midx/C/visus.idx' />
    <D type='disk' chmod='r' url='file://./docs/examples/midx/D/visus.idx' />
  </access>  
</dataset>  

Local MIDX. Local IDX block caching

Note that is useless to create two local copies of child datasets. It would make more sense if you had remote datasets.

<dataset name="Example" url="file://./docs/examples/midx/visus.midx">
  <access name="MultipleAccess" type="MultipleAccess">
    <A type='multiplex'>
      <access type='disk' chmod='rw' url="file://$(VisusCacheDirectory)/A/visus.idx" />
      <access type='disk' chmod='r'  url='file://./docs/examples/midx/A/visus.idx' />
    </A>
    <B type='multiplex'>
      <access type='disk' chmod='rw' url="file://$(VisusCacheDirectory)/B/visus.idx" />
      <access type='disk' chmod='r'  url='file://./docs/examples/midx/B/visus.idx' />
    </B>
    <C type='multiplex'>
      <access type='disk' chmod='rw' url="file://$(VisusCacheDirectory)/C/visus.idx" />
      <access type='disk' chmod='r'  url='file://./docs/examples/midx/C/visus.idx' />
    </C>
    <D type='multiplex'>
      <access type='disk' chmod='rw' url="file://$(VisusCacheDirectory)/D/visus.idx" />
      <access type='disk' chmod='r'  url='file://./docs/examples/midx/D/visus.idx' />
    </D>
  </access> 
</dataset>   

Local MIDX. Local MIDX block caching

All datasets must have the same IDX bitmask. Otherwise it won't work.

<dataset name="Example" url="file://./docs/examples/midx/visus.midx">
    
  <access name="DefaultAccess" type="multiplex" >
        
    <!-- here I do the up-midx caching -->
      <access type="DiskAccess" chmod='rw'  dir="./cached" compression="zip" />
        
    <!-- child access -->
    <access name="MultipleAccess" type="MultipleAccess">
      <A type='disk' chmod='r' url='file://./docs/examples/midx/A/visus.idx' />
      <B type='disk' chmod='r' url='file://./docs/examples/midx/B/visus.idx' />
      <C type='disk' chmod='r' url='file://./docs/examples/midx/C/visus.idx' />
      <D type='disk' chmod='r' url='file://./docs/examples/midx/D/visus.idx' />
    </access> 
  </access> 
</dataset>

Remote MIDX. Local MIDX block caching

Example for remote MIDX pin2d on atlantis:

<dataset typename="IdxMultipleDataset" url="file:///usr/sci/cedmav/LDAV/midx/pin2d.midx">
  <dataset name="A" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/A" />
  <dataset name="B" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/B" />
  <dataset name="C" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/C" />
  <dataset name="D" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/D" />
  <dataset name="E" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/E" />
</dataset>

The MIDX processing is done server side (example: fieldname is 'avg'). The client caches the MIDX blocks got from server.

<dataset name="Example" url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d">
  <access name="DiskAccess"  type='multiplex'>
    <access name="Example" type="DiskAccess" dir="./cached" compression="zip" />
    <access type='network' chmod='r' compression='zip' url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d" />
  </access> 
</dataset>   

Remote MIDX. Local IDX block caching

Example for remote MIDX pin2d on atlantis:

<dataset typename="IdxMultipleDataset" url="file:///usr/sci/cedmav/LDAV/midx/pin2d.midx">
  <dataset name="A" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/A" />
  <dataset name="B" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/B" />
  <dataset name="C" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/C" />
  <dataset name="D" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/D" />
  <dataset name="E" url="$(protocol)://$(hostname):$(port)/mod_visus?action=readdataset&amp;dataset=pin2d/E" />
</dataset>

The server serves child IDX datasets. The child caches the child IDX datasets. The MIDX processing is done client side.

<dataset name="Example" url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d" >
 <access name="MultipleAccess" type="MultipleAccess">
  <A type='multiplex'>
   <access type='disk' chmod='rw' url='file://./cached/A/visus.idx'  />
   <access type='network' chmod='r' compression='zip' url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d/A" />
  </A>
  <B type='multiplex'>
   <access type='disk' chmod='rw' url='file://./cached/B/visus.idx'  />
   <access type='network' chmod='r' compression='zip' url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d/B" />
  </B>
  <C type='multiplex'>
   <access type='disk' chmod='rw' url='file://./cached/C/visus.idx'  />
   <access type='network' chmod='r' compression='zip' url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d/C" />
  </C>
  <D type='multiplex'>
   <access type='disk' chmod='rw' url='file://./cached/D/visus.idx'  />
   <access type='network' chmod='r' compression='zip' url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d/D" />
  </D>
  <E type='multiplex'>
   <access type='disk' chmod='rw' url='file://./cached/E/visus.idx'  />
   <access type='network' chmod='r' compression='zip' url="http://atlantis.sci.utah.edu/mod_visus?dataset=pin2d/E" />
  </E>  
 </access>
</dataset>