<div dir="ltr"><div class="gmail_default" style="color:#333399">Thanks for your reply Armand. Sorry I'm not an expert in matlab memory/caching/loading issues.</div><div class="gmail_default" style="color:#333399">Overall it seems like you don't have a "block" but rather you're trying to speed up loading/saving.</div><div class="gmail_default" style="color:#333399">We might here from some other users who are more saavy about these machine/memory issues.</div><div class="gmail_default" style="color:#333399">A few more last notes below.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">1. true, I don't see how a good export from mff to .set/.fdt could be messing you up. I guess it depends on exactly how mff is saved (I assume all in matlab, one can review the saving code). I'll assume you're using the eeglab MFF import function, but you might be using something else.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">2. that should not be critical, just suggestion based on my preferences.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">3. cool.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">4. just try doing some steps from the GUI, and reviewing eegh which spits out the commands that were just run. </div><div class="gmail_default" style="color:#333399">It's unusual for an eeglab user to not have worked with the GUI ever, as it is required for the online tutorial. [If you haven't had a chance to, there's a lot to learn about EEG.structure and scripting in the online tutorials]</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">*to explore different saving options, you want to check the available flags within the functions that you are using (open NAMEofFUNCTION, or help NAMEofFUNCTION, or doc NAMEofFUNCTION). The larger files might be hitting some limit and/or saving in a unique way due to their size. Alternatively within the functions, for example pop_saveset, find the line that actually saves the file, and one could add the different matlab flag there. See also online matlab documentation on -7.3 version saving, etc..</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">*check the single/double precision of the files that are giving you problems. Changing to double precision might be occurring, but I'm not sure it would impact your loading problem.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">*try a colleagues PC with lower RAM, and let it sit for a while. Of course you could try a range of setups.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 25, 2017 at 3:57 PM, Armand Mensen <span dir="ltr"><<a href="mailto:research.mensen@gmail.com" target="_blank">research.mensen@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><div><div><div><div><div><div><div>Thanks for the response Tarik!<br><br></div>In response to your suggestions:<br><br></div>1. Indeed ".raw" format seems to run much smoother as its what I used to do. But this requires access to a computer with NetStation all the time to convert and loses some basic meta-data, so that's why I preferred to convert directly from the mff, and then only have to store the mff files as a backup and the converted EEGLAB file. However, the conversion from mff, despite also being relatively slow, does run well and I can process the data afterwards. If this is specific to the mff file conversion, how could it be that even once converted to fdt/set, it still has some properties that make it slow to load afterwards.<br><br></div>2. I really like the fdt/set way of saving things, because throughout my analysis I add a bunch of custom information within the .set file and like to retain the ability to load just the set file to access this meta information without having to load all the actual data. Note that this is not happening yet when I have the problem with the memory.<br><br></div>3. Indeed, the conversion from mff seems to work, and I can explore all the data without any noticeable problem with the data (except for the crazy memory usage).<br><br></div>4. I always work from the command line and never the GUI, so only ever have a single EEG struct in the workspace at any time.<br><br></div>Re the "naive suggestions"<br></div>- How could I explore different matlab saving options given that I only use the native EEGLAB pop_saveset() and pop_loadset() functions?<br></div>- All single precision saved and loaded. Could it be there is a double conversion happening somewhere in the loading that therefore expands all the data? Or is there just some useless copying of the data that it uses 4x the memory?<br></div>- Unfortunately I don't have access to multiple 64GB RAM PCs around, so can't really attempt the conversion etc on another PC... but might try some colleagues PC if it comes down to that.<br><br></div>Hope that extra info provided can help me figure this out.<br><br></div>Thanks again!<br></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On 25 April 2017 at 21:40, Tarik S Bel-Bahar <span dir="ltr"><<a href="mailto:tarikbelbahar@gmail.com" target="_blank">tarikbelbahar@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="color:#333399">Hello Armand, this may be something about your setup though you have large files that don't seem to have this problem.</div><div class="gmail_default" style="color:#333399">Also, it's not clear what "slower" means in your case. If it's a matter of ~10 to 20 minutes to load for a giant file, that might be appropriate.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">I'd recommend you check in what other circumstances (with matlab) that similar "leaks" occur, so as to make sure it's not something about your PCs setup.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">I've worked with ~5GB 500 hz files from ~7 hour recordings and have had no issue except slightly slower loading for multi-GB files (with adequate RAM and CPU).</div><div class="gmail_default" style="color:#333399">Here are some notes below that might be of use to you. Please let the list know if you achieve clarity on this topic.</div><div class="gmail_default" style="color:#333399">You may also google eeglablist and your topic for previous similar posts about memory usage or memory "leaks".</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">1. You may want to export the files as .raw if you have not, and then import them.</div><div class="gmail_default" style="color:#333399">2. You may want to not use the .fdt/.set but just .set [change in eeglab options]</div><div class="gmail_default" style="color:#333399">3. There may be issues with straight loading of mff format into matlab, though it seems you converted them correctly first.</div><div class="gmail_default" style="color:#333399">Try step 1 and see if it makes any difference.</div><div class="gmail_default" style="color:#333399">4. you may want to check whether you've changed eeglab options to hold only the current file in memory, rather than all. Check out all the eeglab options you can set from the GUI.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">naive extra suggestions:</div><div class="gmail_default" style="color:#333399">this might have to do with the format that matlab saved the files in (e.g., the 7.3 flag).</div><div class="gmail_default" style="color:#333399">this might be due to single versus double precision</div><div class="gmail_default" style="color:#333399">this might have to due with unique setup on your PCs</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div></div>
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