<div dir="auto"><div style="font-family:sans-serif" dir="auto">Hi Utkarsh, thank you for the detailed explanation =) </div><div style="font-family:sans-serif" dir="auto"><br></div><div style="font-family:sans-serif" dir="auto">I will definitely try out and see the different performances with compressed/decompressed data. </div><div style="font-family:sans-serif" dir="auto"><br></div><div style="font-family:sans-serif" dir="auto">The data types are <i>Structured Grid</i>, <i>Structured Points </i>and<i> Rectilinear Grid. </i>All of them are written in VTK 2.0 version. </div><div style="font-family:sans-serif" dir="auto"><i><br></i></div><div style="font-family:sans-serif" dir="auto">When loading in 2 ranks the data is loaded only in 1 rank (ID 0) consequently having only one color. </div><br><br><div class="gmail_quote" dir="auto"><div dir="ltr">Em qui, 19 de abr de 2018 22:29, Utkarsh Ayachit <<a href="mailto:utkarsh.ayachit@kitware.com">utkarsh.ayachit@kitware.com</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">The options presented when saving data:<br></div></blockquote><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><br></div><div>- Data Mode: ASCII | BINARY | APPENDED</div><div>- Encode Appended Data: TRUE | FALSE</div><div>- Compressor Type: NONE | ZLIB</div><div><br></div><div><b>What do the mean and how they affect performance?</b></div></div></blockquote><div><br></div><div>These determine how the binary data (your arrays, point coordinates etc) is saved in the file. ASCII is not to be used to anything but small dataset for debugging. BINARY saves the data as binary, however it still needs to encode it (using base64) so that the XML can be parsed correctly. Generally, you want to pick APPENDED (where the binary data is added at the end of the XML header(ish) and then can be saved as raw binary dump without any encoding. No encoding implies you can't easily look at the file in a ASCII text editor, but will be easier to write and read since neither needs to do any processing to convert the binary data. For appended APPENDED or BINARY mode, compressor type allows you to pick a compression technique to use. This minimizes file size but adds computing cost of compressing /decompressing. It's a trade off between reading more from the disk or spending more time decompressing it after reading form disk. Generally, reading form disk is slower, so you may still be better off compressing. 5.5 offer better compression options like LZ4 & LZMA which may be worth exploring too.</div><div><br></div><div>Before I answer your other questions, what type of data is this? Image data? Unstructured grid? When you load it on 2 ranks, if you color your surface by vtkProcessId, is it being read in as paritioned across two ranks or all of the data is on rank 0?<br></div><div><br></div><div>Utkarsh</div></div></div></div>
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