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  • Firefox all but freezes during large file upload; Ajax progress bar infeasible; IE6 works fine

    - by Sean
    I want to provide a progress bar for my users who upload very large files. I did some reading and implemented what should be a pretty straightforward solution: I have a <form> element that contains an file input element; its target is set to the ID of a hidden iframe. On the server side, there's some Spring magic that attaches an object to the user's session; the progress of the upload can be queried from this object. After submitting the form, I start a repeating Ajax call using setInterval that queries the server for the percent-complete using the aforementioned session object. The call repeats every half-second, skipping the Ajax call if the previous call has not yet completed. I use the data from the call to update the width of an onscreen element. When the server call reports that the upload is complete, I clear the interval timer. I created a 100-megabyte file and uploaded it using my interface. This is using Firefox 3.6.3. What I found is that although the upload takes 20-25 seconds, the progress bar doesn't get updated until the very end. Moreover, the entire browser is basically frozen until the upload completes. I assumed that my method must be flawed, but I tried the same page using IE6, and was utterly amazed when it behaved as I had designed it to--the progress bar got updated every half second, and the whole upload only took about 15 seconds, much faster than Firefox. I don't have many add-ons installed, but I tried disabling Firebug and restarting my browser. This marginally improved the performance--I got perhaps a single additional progress bar update mid-upload--but still far from acceptable. Can anyone tell me what I can do to bring Firefox's performance up to the level of IE6? Ugh, I can't believe I actually typed that. EDIT: I just tried uploading a large file from a Firefox 3.6.3 browser on a different machine than the one that's running my web server, and it worked fine. Huh.

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  • DNS add-on domain setup and redirect

    - by brian
    I have several domains which I'd like to point to another (I'll call it foo.com). A couple of things aren't entirely clear to me. First, the DNS. I'm using Kloxo/HyperVM. Do I need to create separate DNS entries for each domain? Or do I just create separate CNAME or other records under foo.com? I thought it was the latter but when I click on "Add CNAME" I'm prompted to fill in the subdomain portion of foo.com. The nameservers have already been set to point to my VPS. For the redirect, would the following be appropriate within the vhost conf for foo.com? ServerName www.foo.com ServerAlias foo.com foo.net foo.org bar.com bar.net bar.org RewriteCond %{HTTP_HOST} ^foo.com [NC] RewriteCond %{HTTP_HOST} *foo.net [NC,OR] RewriteCond %{HTTP_HOST} *foo.org [NC,OR] RewriteCond %{HTTP_HOST} *bar.com [NC,OR] RewriteCond %{HTTP_HOST} *bar.net [NC,OR] RewriteCond %{HTTP_HOST} *bar.org [NC] RewriteRule ^(.*)$ http://www.foo.com/$1 [R=301,NC] (The first condition is just to force the "www" part)

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  • Algorithm to Find the Aggregate Mass of "Granola Bar"-Like Structures?

    - by Stuart Robbins
    I'm a planetary science researcher and one project I'm working on is N-body simulations of Saturn's rings. The goal of this particular study is to watch as particles clump together under their own self-gravity and measure the aggregate mass of the clumps versus the mean velocity of all particles in the cell. We're trying to figure out if this can explain some observations made by the Cassini spacecraft during the Saturnian summer solstice when large structures were seen casting shadows on the nearly edge-on rings. Below is a screenshot of what any given timestep looks like. (Each particle is 2 m in diameter and the simulation cell itself is around 700 m across.) The code I'm using already spits out the mean velocity at every timestep. What I need to do is figure out a way to determine the mass of particles in the clumps and NOT the stray particles between them. I know every particle's position, mass, size, etc., but I don't know easily that, say, particles 30,000-40,000 along with 102,000-105,000 make up one strand that to the human eye is obvious. So, the algorithm I need to write would need to be a code with as few user-entered parameters as possible (for replicability and objectivity) that would go through all the particle positions, figure out what particles belong to clumps, and then calculate the mass. It would be great if it could do it for "each" clump/strand as opposed to everything over the cell, but I don't think I actually need it to separate them out. The only thing I was thinking of was doing some sort of N2 distance calculation where I'd calculate the distance between every particle and if, say, the closest 100 particles were within a certain distance, then that particle would be considered part of a cluster. But that seems pretty sloppy and I was hoping that you CS folks and programmers might know of a more elegant solution? Edited with My Solution: What I did was to take a sort of nearest-neighbor / cluster approach and do the quick-n-dirty N2 implementation first. So, take every particle, calculate distance to all other particles, and the threshold for in a cluster or not was whether there were N particles within d distance (two parameters that have to be set a priori, unfortunately, but as was said by some responses/comments, I wasn't going to get away with not having some of those). I then sped it up by not sorting distances but simply doing an order N search and increment a counter for the particles within d, and that sped stuff up by a factor of 6. Then I added a "stupid programmer's tree" (because I know next to nothing about tree codes). I divide up the simulation cell into a set number of grids (best results when grid size ˜7 d) where the main grid lines up with the cell, one grid is offset by half in x and y, and the other two are offset by 1/4 in ±x and ±y. The code then divides particles into the grids, then each particle N only has to have distances calculated to the other particles in that cell. Theoretically, if this were a real tree, I should get order N*log(N) as opposed to N2 speeds. I got somewhere between the two, where for a 50,000-particle sub-set I got a 17x increase in speed, and for a 150,000-particle cell, I got a 38x increase in speed. 12 seconds for the first, 53 seconds for the second, 460 seconds for a 500,000-particle cell. Those are comparable speeds to how long the code takes to run the simulation 1 timestep forward, so that's reasonable at this point. Oh -- and it's fully threaded, so it'll take as many processors as I can throw at it.

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  • Can I remove "Free space" text from the Nautilus status bar?

    - by DisgruntledGoat
    I want to remove the part in Nautilus that shows free disk space. In theory it may useful but it's so badly designed, every time I select some files my eye gets drawn to "15 GB" instead of the actual size of the files. And with no files selected, it says something like "24 items, Free space 15GB" which at a quick glance looks like the total size of the files. I've looked through the preferences and don't see anything. I'm using Ubuntu 10.10 with Nautilus 2.32.0.

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  • How can I disable the css {position:fixed} side-bar on Slashdot?

    - by Tom
    When I look at a story on Slashdot, I see a side-bar that sits constantly in the upper-left corner. Every time I open a story, I have to click on the "slash" sign in its upper-right corner. How can I disable it, so it will always have css position absolute, relative or static? Is there an option for it? Because I find it is slowing my browser down when I am scrolling the page. Thank you, Tom

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  • How do I change the quickix title (status bar) in vim?

    - by romeovs
    I'm have the following makeprg to compile my tex files in vim: setlocal makeprg=pdflatex\ \-file\-line\-error\ \-shell\-escape\ \-interaction=nonstopmode\ $*\\\|\ tee\ \/dev\/tty\ \\\|\ grep\ \-P\ ':\\d{1,5}:\ ' which gives me good results (errors displayed properly, tex compilation shown while busy,...) Yet there is one thing I'm not pleased off: when there are errors and the quickfix window pops up, its status bar is cluttered up with the makeprg string: pdflatex\ \-file\-line\-error\ \-shell\-escape\ \-interaction=nonstopmode\ $*\\\|\ tee\ \/dev\/tty\ \\\|\ grep\ \-P\ ':\\d{1,5}:\ ' Is there a way of changing the quickfix title/statusbar?

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  • Moving a window that can't be dragged by the title bar?

    - by ccat
    I have Fallout Collection and I am trying to run it windowed because of the low resolution. When I change the mode to windowed via the .ini file, however, it starts the game with the window shoved into the upper left corner of my screen. Clicking the title bar of the window just clicks back into the game program. So how can I move it to the center of my screen? I am using Windows 7 professional 64-bit.

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  • Can I get my http back in the address bar in Firefox?

    - by Abel
    Since Firefox 7 (or 6?) they silently removed "http" from the address bar. Previously, when you clicked it, "http" showed up again, allowing to easily just change http into https. So far, I found two ways to get it back, but isn't there a setting I can use to have it permanently in vision again, or at least when I click it? Way 1: copy selection and paste it again Way 2: type the whole scheme again in front of the address ...

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  • MS Chart with ASP.NET chart type "column" not showing axis x label if there are more than 9 bar in t

    - by Bayonian
    Hi, I'm having problem with MS Chart chart type column. If there are only 9 bar in the chart like the following picture, then the axis-x label show up properly. However, there are more than 9 bars bar the chart, the axis-x label wont show up properly, some of them just dissappear. Here's my mark-up for the chart: <asp:Chart ID="chtNBAChampionships" runat="server"> <Series> <asp:Series Name="Championships" YValueType="Int32" Palette="Berry" ChartType="Column" ChartArea="MainChartArea" IsValueShownAsLabel="true"> <Points> <asp:DataPoint AxisLabel="Celtics" YValues="17" /> <asp:DataPoint AxisLabel="Lakers" YValues="15" /> <asp:DataPoint AxisLabel="Bulls" YValues="6" /> <asp:DataPoint AxisLabel="Spurs" YValues="4" /> <asp:DataPoint AxisLabel="76ers" YValues="3" /> <asp:DataPoint AxisLabel="Pistons" YValues="3" /> <asp:DataPoint AxisLabel="Warriors" YValues="3" /> <asp:DataPoint AxisLabel="Mara" YValues="4" /> <asp:DataPoint AxisLabel="Saza" YValues="9" /> <asp:DataPoint AxisLabel="Buha" YValues="6" /> </Points> </asp:Series> </Series> <ChartAreas> <asp:ChartArea Name="MainChartArea"> </asp:ChartArea> </ChartAreas> </asp:Chart> I don't know it works with only 9 bars? Is there any way to make the chart work properly? Also, if possible, how to make each bar have different color. Thank you.

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  • Is it possible to have a SeekBar's thumb image extend outside the bar?

    - by Poko
    I have set negative paddings on my custom seekbar so that the round thumb image can go outside the bar, but the thumb isn't rendered out there, is there anyway to force the thumb to be drawn outside those bounds? Sorry guys, I'm new to Android development, and have been tasked with fixing an existing application. The problem is that we have a custom rounded looking track bar, which consists of two rounded 'end cap' images and a 1 px background that is tiled to create the seekbar. As far as I can tell there was never one image that could be set as the background of a normal SeekBar, which is why a custom one was created. The thumb is a circle and needs to 'fit' into the end caps - the three pieces of the bar are in a relative layout. Right now I'm kind of unclear as to how the 1 px background png gets stretched as the seekbar bg, otherwise I would try to tack on the two endcaps onto that drawable some how ... ? Please let me know if this was unclear and I'll try to post any followup info. Thanks in advance for any advice!! Oh, I'm using Android 2.1 if that's relevant to anyone's interests :)

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