<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Andrea,<div class=""><br class=""></div><div class="">The volume command dataCacheSize option will do this. For example for 32 Gbytes of memory cache for volume data use command<div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>volume dataCacheSize 32000</div><div class=""><br class=""></div><div class="">The default is to set it to half the physical memory of the computer. </div><div class=""><br class=""></div><div class=""><a href="https://www.rbvi.ucsf.edu/chimerax/docs/user/commands/volume.html#sampling" class="">https://www.rbvi.ucsf.edu/chimerax/docs/user/commands/volume.html#sampling</a></div><div class=""><br class=""></div><div class="">I would not suggest changing it because surface and image rendering typically use an amount memory for the graphics similar to the data size. The cache is only for the volume data, so with graphics, the current setting can utilize all your memory. Increasing it can cause data to be paged out to disk with horrible performance. The above setting is not saved. If you did want to change it for every ChimeraX session you would use Preferences / Startup / Execute these commands at startup.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Tom</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 3, 2021, at 9:04 AM, Andrea Fera <<a href="mailto:andrea.fera@revealgc.com" class="">andrea.fera@revealgc.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class="">Dear Mr. Goddard,<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class="">This is Andrea. I am not sure that you remember me, but we met in 2013 or so in S. Francisco and Berkeley.<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class="">I am a strenuous fan of your software! Especially for volume rendering of cryo-type tomograms.<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class="">I do have a tomogram pf a few Gb that I would like to render with your software. I use a Lynux server with LOTS of RAM. How can I increase the RAM allocated by ChimeraX?<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class="">Thank you and all best…<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-family: "Times New Roman", serif;" class="">Andrea Fera<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 10pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 8pt; font-family: "Times New Roman", serif;" class="">--<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 8pt; font-family: "Times New Roman", serif;" class="">Andrea Fera, PhD<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 8pt; font-family: "Times New Roman", serif;" class="">Senior Data Scientist<o:p class=""></o:p></span></div><div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span id="cid:image003.jpg@01D71025.6BBB9990"><image003.jpg></span></div></div></div></blockquote></div><br class=""></div></div></body></html>