<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div><br></div><div>Some improvements coming for FLASH data in VisIt 2.0:</div><br><div><br><div>Begin forwarded message:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="4" color="#000000" style="font: 14.0px Helvetica; color: #000000"><b>From: </b></font><font face="Helvetica" size="4" style="font: 14.0px Helvetica">Hank Childs <<a href="mailto:hankchilds@gmail.com">hankchilds@gmail.com</a>></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="4" color="#000000" style="font: 14.0px Helvetica; color: #000000"><b>Date: </b></font><font face="Helvetica" size="4" style="font: 14.0px Helvetica">March 21, 2010 10:07:46 AM CDT</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="4" color="#000000" style="font: 14.0px Helvetica; color: #000000"><b>To: </b></font><font face="Helvetica" size="4" style="font: 14.0px Helvetica">Randy Hudson <<a href="mailto:hudson@mcs.anl.gov">hudson@mcs.anl.gov</a>></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="4" color="#000000" style="font: 14.0px Helvetica; color: #000000"><b>Subject: </b></font><font face="Helvetica" size="4" style="font: 14.0px Helvetica"><b>info about FLASH</b></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div> </div><div>Hi Randy,<br><br>I would appreciate it if you circulate information about VisIt<br>improvements for FLASH data in V2.0. V2.0 will be available in<br>approximately two and a half weeks.<br><br>Thanks!!<br>-Hank<br><br>There are four major changes:<br>(1) Subsetting relationships were being represented inefficiently in<br>VisIt and that data structure has been tuned significantly. For big<br>data sets, there used to be a large delay when creating plots, as well<br>as a long pause after you pressed "Draw" and you started getting<br>status (among other problems). This is now signifcantly better.<br>(2) The processor information is now available under database options.<br> If you choose "File->Open" and set the file format to FLASH, you can<br>then set the Default open options ("database options"). There is a<br>check box there that allows you to access processor information (and<br>not group information). Putting the processor information in the<br>default file format options was one of the changes necessary for<br>achieving the speedup described in (1).<br>(3) 1D curves were being resampled to the resolution of the finest<br>patch. This is now fixed and the curve is efficiently implemented.<br>That said, there is a database option to use the old style curves in<br>case there is a bug in the new implementation (AMR nesting is a tricky<br>beast ... we think it works, but you never know).<br>(4) The largest remaining problem in VisIt is with patch abutment.<br>VisIt creates ghost data around patches at the same refinement level<br>and it does this by using patch abutment information. Its data<br>structure (which is generic and not optimized for AMR) is taking<br>almost 1GB in memory for FLASH data sets with hundreds of thousands of<br>patches. This data structure is needed for contours, but not for<br>volume rendering or slices. The database options now allow you to<br>disable this structure, which should save you memory in the case where<br>you have hundreds of thousands of patches.<br><br>Best regards,<br>VisIt development team<br></div></blockquote></div><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Monaco; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div><font class="Apple-style-span" face="'Courier New'" size="4"><span class="Apple-style-span" style="font-size: 14px; "><br class="Apple-interchange-newline">Randy.</span></font></div><div><br></div></span><br class="Apple-interchange-newline"> </div><br></body></html>