Databases
StackOverflow2013
Postsdbo
POData structure to store huge amount of data?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POData structure to store huge amount of data?
    primarykey
    data
    text
    <p>In my application,I have to load volumedata from set of images (MRC images) and keep the pixel data in memory.(images are grayscaled ,so one byte per pixel).</p> <p>My development environment is QT framework ,MinGW for Windows and GCC for Linux.</p> <p>At the moment,I use a simple data structure to store volumedata as :</p> <pre><code>unsigned char *volumeData; </code></pre> <p>and do one huge allocation as follows.</p> <pre><code>volumeData=new unsigned char[imageXsize * imageYsize * numofImages]; </code></pre> <p>Following are the important methods to access image-data in a given plane,such as</p> <pre><code>unsigned char* getXYPlaneSlice(int z_value); unsigned char* getYZPlaneSlice(int x_value); unsigned char* getZXPlaneSlice(int y_value); </code></pre> <p>With my simple data-structure it was easy to implement above methods.</p> <p>But we might need to adopt to volume size as 2000x2000x1000 (~3.7Gb) in the future.And current datastructure will not be able to handle that huge data.</p> <ol> <li><p>How to avoid fragmentation ? Now,even with 1000x1000x200 data, application crash giving bad_alloc. Whats the best way to change the datastructure for this ? shall I use something like linked-list which each chunk is of size 100mb.</p></li> <li><p>Also,user should be able to perfome some image-processing filters on volume-data and also should be able to reset to original pixel value. That means, I should keep two copies of volume-data. With current implemetation its like.</p> <p>unsigned char *volumeDataOriginal;</p> <p>unsigned char *volumeDataCurrent;</p></li> </ol> <p>So with 2000x2000x1000 data-range its going to utilize about 8Gb (4Gb for each volume). But in Win32 , the address space is 4GB.How to tackle this ? I should go with 64bit application ?</p> <p>EDIT : Here is a snapshot of my application <img src="https://i.stack.imgur.com/wB3Q8.png" alt="enter image description here"></p> <p>Basically,I load the volume-data (from set of images,from MRC format..etc) and display them in different plane-viewers (XY,YX,YZ.Image shows XY-plane-viewer).I need to keep above 3 data-access methods to show an image in a particular plane.using slider-bar user can change which image to show in the selected plane)</p> <p>Thanks in advance.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USGuru
    1. USAshika Umanga Umagiliya
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POData structure to store huge amount of data?
      1. USmeklarian
      1. VTFavorite
    2. VO
      singulars
      1. POData structure to store huge amount of data?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POData structure to store huge amount of data?
      1. USChubsdad
      1. VTFavorite
    1. COYou may want to explore the Flyweight design pattern and attack the problem at a higher design level. The intent is "Use sharing to support large numbers of fine-grained objects efficiently."
      singulars
      1. POData structure to store huge amount of data?
      1. USChubsdad
    2. COWhat are you doing with this huge memory chunk? How does the user interact? It's hard to tell from your current description whether the image quality can be degraded, whether its entire contents has to reside in memory at all times etc.
      singulars
      1. POData structure to store huge amount of data?
      1. USyonilevy
    3. COYou could also consider Address Windowing Extension: http://msdn.microsoft.com/en-us/library/aa366527(VS.85).aspx
      singulars
      1. POData structure to store huge amount of data?
      1. USruslik
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload