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• PHP-FPM stops responding and dies [migrated]

  - by user12361

  I'm running Drupal 6 with Nginx 1.5.1 and PHP-FPM (PHP 5.3.26) on a 1GB single core VPS with 3GB of swap space on SSD storage. I just switched from shared hosting to this unmanaged VPS because my site was getting too heavy, so I'm still learning the ropes. I have moderately high traffic, I don't really monitor it closely but Google Adsense usually record close to 30K page views/day. I usually have 50 to 80 authenticated users logged in and a few hundred more anonymous users hitting the Boost static HTML cache at any given moment. The problem I'm having is that PHP-FPM frequently stops responding, resulting in Nginx 502 or 504 errors. I swear I have read every page on the internet about this issue, which seems fairly common, and I've tried endless combinations of configurations, and I can't find a good solution. After restarting Nginx and PHP-FPM, the site runs really fast for a while, and then without warning it simply stops responding. I get a white screen while the browser waits on the server, and after about 30 seconds to a minute it throws an Nginx 502 or 504 error. Sometimes it runs well for 2 minutes, sometimes 5 minutes, sometimes 5 hours, but it always ends up hanging. When I find the server in this state, there is still plenty of free memory (500MB or more) and no major CPU usage, the control and worker PHP-FPM processes are still present, and the server is still pingable and usable via SSH. A reload of PHP-FPM via the init script revives it again. The hangups don't seem to correspond to the amount of traffic, because I observed this behavior consistently when I was testing this configuration on a development VPS with no traffic at all. I've been constantly tweaking the settings, but I can't definitively eliminate the problem. I set Nginx workers to just 1. In the PHP-FPM config I have tried all three of the process managers. "Dynamic" is definitely the least reliable, consistently hanging up after only a few minutes. "Static" also has been unreliable and unpredictable. The least buggy has been "ondemand", but even that is failing me, sometimes after as much as 12 to 24 hours. But I can't leave the server unattended because PHP-FPM dies and never comes back on its own. I tried adjusting the pm.max_children value from as low as 3 to as high as 50, doesn't make a lot of difference, but I currently have it at 10. Same thing for the spare servers values. I also have set pm.max_requests anywhere from 30 to unlimited, and it doesn't seem to make a difference. According to the logs, the PHP-FPM processes are not exiting with SIGSEGV or SIGBUS, but rather with SIGTERM. I get a lot of lines like: WARNING: [pool www] child 3739, script '/var/www/drupal6/index.php' (request: "GET /index.php") execution timed out (38.739494 sec), terminating and: WARNING: [pool www] child 3738 exited on signal 15 (SIGTERM) after 50.004380 seconds from start I actually found several articles that recommend doing a graceful reload of PHP-FPM via cron every few minutes or hours to circumvent this issue. So that's what I did, "/etc/init.d/php-fpm reload" every 5 minutes. So far, it's keeping the lights on. But it feels like a dreadful hack. Is PHP-FPM really that unreliable? Is there anything else I can do? Thanks a lot!

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• Particle trajectory smoothing: where to do the simulation?

  - by nkint

  I have a particle system in which I have particles that are moving to a target and the new targets are received via network. The list of new target are some noisy coordinates of a moving target stored in the server that I want to smooth in the client. For doing the smoothing and the particle I wrote a simple particle engine with standard euler integration model. So, my pseudo code is something like that: # pseudo code class Particle: def update(): # do euler motion model integration: # if the distance to the target is more than a limit # add a new force to the accelleration # seeking the target, # and add the accelleration to velocity # and velocity to the position positionHistory.push_back(position); if history.length > historySize : history.pop_front() class ParticleEngine: particleById = dict() # an associative array # where the keys are the id # and particle istances are sotred as values # this method is called each time a new tcp packet is received and parsed def setNetTarget(int id, Vec2D new_target): particleById[id].setNewTarget(new_target) # this method is called each new frame def draw(): for p in particleById.values: p.update() beginVertex(LINE_STRIP) for v in p.positionHistory: vertex(v.x, v.y) endVertex() The new target that are arriving are noisy but setting some accelleration/velocity parameters let the particle to have a smoothed trajectories. But if a particle trajectory is a circle after a while the particle position converge to the center (a normal behaviour of euler integration model). So I decided to change the simulation and use some other interpolation (spline?) or smooth method (kalman filter?) between the targets. Something like: switch( INTERPOLATION_MODEL ): case EULER_MOTION: ... case HERMITE_INTERPOLATION: ... case SPLINE_INTERPOLATION: ... case KALMAN_FILTER_SMOOTHING: ... Now my question: where to write the motion simulation / trajectory interpolation? In the Particle? So I will have some Particle subclass like ParticleEuler, ParticleSpline, ParticleKalman, etc..? Or in the particle engine?

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• How to achieve selection of a tile from a tile sheet based on an ID?

  - by Bugster

  Let's say I have a tile sheet that contains 8 sprites per sheet. Each sprite is a tile of 30x30. I wrote my own custom map parser/map loader however I'm having trouble extracting a certain tile sprite from the file. I'll describe my problem better in order for everyone to understand. I wrote an enum of materials, each material has a value according to it's location relative to the tile sheet. For example void is 1, grass is 2, rock is 3, etc. So in my tile sheet they are represented as such: +---+---+---+---+---+ | 1 | 2 | 3 | 4 | 5 | +---+---+---+---+---+ Which is equivalent to: +------+-------+-------+ | void | grass | stone | +------+-------+-------+ Basically when rendering, I created a tile class, each tile has 2 coordinates: X and Y (They are calculated automatically) and a material which can be represented either as a number, either as a value (ID). When rendering, I have a vector of sprites which are all taken from 1 file called tilesheet.png, however each of them must only draw a certain portion of the tile sheet, for example say I have something like this: tile coordinateBounds(topLeftX, topLeftY, tileWidth, tileHeight); During the initialization of the map I calculate an array of tiles, and I give each of them their position, their materials based on the values in a map file and a few other variables such as collision. I need to apply the coordinateBounds to each of them according to their material value. For example if the material is grass it should only take the grass sprite from the tilesheet. I must also mention I'm using SFML, and there are no borders or spacing between the tiles.

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• Parameterized StreamInsight Queries

  - by Roman Schindlauer

  The changes in our APIs enable a set of scenarios that were either not possible before or could only be achieved through workarounds. One such use case that people ask about frequently is the ability to parameterize a query and instantiate it with different values instead of re-deploying the entire statement. I’ll demonstrate how to do this in StreamInsight 2.1 and combine it with a method of using subjects for dynamic query composition in a mini-series of (at least) two blog articles. Let’s start with something really simple: I want to deploy a windowed aggregate to a StreamInsight server, and later use it with different window sizes. The LINQ statement for such an aggregate is very straightforward and familiar: var result = from win in stream.TumblingWindow(TimeSpan.FromSeconds(5))               select win.Avg(e => e.Value); Obviously, we had to use an existing input stream object as well as a concrete TimeSpan value. If we want to be able to re-use this construct, we can define it as a IQStreamable: var avg = myApp     .DefineStreamable((IQStreamable<SourcePayload> s, TimeSpan w) =>         from win in s.TumblingWindow(w)         select win.Avg(e => e.Value)); The DefineStreamable API lets us define a function, in our case from a IQStreamable (the input stream) and a TimeSpan (the window length) to an IQStreamable (the result). We can then use it like a function, with the input stream and the window length as parameters: var result = avg(stream, TimeSpan.FromSeconds(5)); Nice, but you might ask: what does this save me, except from writing my own extension method? Well, in addition to defining the IQStreamable function, you can actually deploy it to the server, to make it re-usable by another process! When we deploy an artifact in V2.1, we give it a name: var avg = myApp     .DefineStreamable((IQStreamable<SourcePayload> s, TimeSpan w) =>         from win in s.TumblingWindow(w)         select win.Avg(e => e.Value))     .Deploy("AverageQuery"); When connected to the same server, we can now use that name to retrieve the IQStreamable and use it with our own parameters: var averageQuery = myApp     .GetStreamable<IQStreamable<SourcePayload>, TimeSpan, double>("AverageQuery"); var result = averageQuery(stream, TimeSpan.FromSeconds(5)); Convenient, isn’t it? Keep in mind that, even though the function “AverageQuery” is deployed to the server, its logic will still be instantiated into each process when the process is created. The advantage here is being able to deploy that function, so another client who wants to use it doesn’t need to ask the author for the code or assembly, but just needs to know the name of deployed entity. A few words on the function signature of GetStreamable: the last type parameter (here: double) is the payload type of the result, not the actual result stream’s type itself. The returned object is a function from IQStreamable<SourcePayload> and TimeSpan to IQStreamable<double>. In the next article we will integrate this usage of IQStreamables with Subjects in StreamInsight, so stay tuned! Regards, The StreamInsight Team

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• RAID1: Migrate HDD to SSD?

  - by OMG Ponies

  My current workstation uses an Adaptec 5805, with Win2008 mirrored between two 72 GB (10K?) savvio drives. My question is if there's a way to migrate the mirror to use SSDs - I've been looking at 90GB Corsair Force (Sandy Bridge) to replace the existing setup. If it's possible, without installing the OS fresh. If I replaced the mirrored drive with an SSD, would the array sync the drives? Then I could promote the SSD mirror to be the primary, and use the second SSD as the mirror. That'd be too easy... Or should use Ghost to get an image of the existing setup, apply it to the SSD for a new mirror to be setup on?

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• Should I use a config file or database for storing business rules?

  - by foiseworth

  I have recently been reading The Pragmatic Programmer which states that: Details mess up our pristine code—especially if they change frequently. Every time we have to go in and change the code to accommodate some change in business logic, or in the law, or in management's personal tastes of the day, we run the risk of breaking the system—of introducing a new bug. Hunt, Andrew; Thomas, David (1999-10-20). The Pragmatic Programmer: From Journeyman to Master (Kindle Locations 2651-2653). Pearson Education (USA). Kindle Edition. I am currently programming a web app that has some models that have properties that can only be from a set of values, e.g. (not actual example as the web app data confidential): light-type = sphere / cube / cylinder The light type can only be the above three values but according to TPP I should always code as if they could change and place their values in a config file. As there are several incidents of this throughout the app, my question is: Should I store possibly values like these in: a config file: 'light-types' = array(sphere, cube, cylinder), 'other-type' = value, 'etc = etc-value a single table in a database with one line for each config item a database with a table for each config item (e.g. table: light_types; columns: id, name) some other way? Many thanks for any assistance / expertise offered.

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• Permission to see the expandable list of ISA Server 2006

  - by Hossein Mobasher

  I am working on ISA Server 2006 in Windows Server. I want to add some policy rules to my server, I followed this link. But It points to In the Microsoft Internet Security and Acceleration Server 2006 management console, expand the array name, and then click the Firewall Policy node. When I open the ISA Server 2006 Management Console, I can not show the expand list, how can I force ISA to show the expandable tree to start Firewall Policy? Could any one please help me to do this ? Note : I have administrator permission for my account. Thanks in advance :)

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• SEO and external sites that serve responsive images (like Re-SRC)

  - by Baumr

  Re-SRC is a tool that allows you to automatically serve responsive images for your website from their cloud servers. It delivers a new image file each time the browser window (viewport) is resized. To use it in your HTML when linking to an image, you would do the following: <img src="http://app.resrc.it//www.your-domain.com/img/img001.jpg"/> Some more background for SEO considerations: As an example, looking at their demo page's code, the src of the Arc de Triomphe photo — when the browser window is resized to be at a tablet-width — shows this particular file at it's widest. It is found under the following URL: http://app4-uk.resrc.it/s=w560,pd1/ro=h//www.resrc.it/img/demo/demo-image-1.jpg If the viewport is increased to desktop-width, then a smaller image is served in line with the design; see this URL: http://app4-uk.resrc.it/s=w320,pd1/ro=h//www.resrc.it/img/demo/demo-image-1.jpg If I change the viewport to be about half-way between those two, then the image's URL is: http://app4-uk.resrc.it/s=w240,pd1/ro=h//www.resrc.it/img/demo/demo-image-1.jpg In other words, I found that there is a separate file for every 10-pixel increment of the image width. Very cool for saving bandwidth on mobile devices and service responsive/retina images on others, but... Here are two problems I see for SEO: The img on your site, part of your semantic markup, will not be hosted on your site at all, or even a server you control. Any links to these images will pass on "link juice" to Re-SRC's site instead. You are serving a vast array of different image files to different people — some may link to one, others to another size. Then there's the question of what different search engine crawlers will see. Also: There seems to be no fallback option if their servers are down. Do you see any other concerns? Or, perhaps, do you not see those as concerns?

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• Disable RAID Controller

  - by B.Mr.W.

  I have some decent HP Proliants server that come with "HP Smart Array P410i Controller" enabled, I am using these boxes to set up a Hadoop cluster and I know, RAID is for sure a no-no for Hadoop since the application itself will take care of data redundancy and extra intelligence provided by RAID won't be helpful and might turn down the performance. I tried to disable the devices at the BIOS and the box cannot even access the disk afterwards. So I am assuming the controller is sitting between disks and mother board, and we have to turn it on and configure it to "level0" or something like that. I am wondering what should I do to "disable" the RAID functionality so it will fit into the Hadoop environment.

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• Where should "display functions" live in an MVC web app?

  - by User

  I'm using the Yii Framework which is an MVC php framework that is pretty similar to your standard web-based MVC framework. I want to display the related data from a many-to-many table as a list of strings in my view. Assuming a table schema like: tag { id, name } post { id, title, content, date } post_tag { post_id, tag_id } A post will display like: Date: 9/27/2012 Title: Some Title Content: blah blah blah... Tags: Smart Funny Cool Informative I can achieve this by doing something like this in my Post view: <?php echo join(' ', array_map(function($tag) { return $tag->name; }, $model->tags)); ?> (where $model->tags is an array of Tag objects associated with my model) My questions are: Is this amount of code/logic okay in the view? (Personally I think I'd rather just reference a property or call a single function.) If not, where should this code live? In the model? the controller? a helper? Potentially I may want to use in in other views as well. Ultimately I think its purely a display issue which would make me think it should be in the view, but then I have to repeat the code in any view I want to use it in.

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• High load on a nagios server -- How many service checks for a nagios server is too many?

  - by Josh

  I have a nagios server running Ubuntu with a 2.0 GHz Intel Processor, a RAID10 array, and 400 MB of RAM. It monitors a total of 42 services across 8 hosts, most of which are checked using the check_http plugin even 5 minutes, some every minute. Recently the load on the nagios server has been above 4, often as high as 6. The server also runs cacti, gathering statistics every minute for 6 hosts. I wonder, how many services should hardware like this be able to handle? Is the load so high because I am pushing the limits of the hardware, or should this hardware be able to handle 42 service checks plus cacti? If the hardware is inadequate, should I look to add more RAM, more cores, or faster cores? What hardware / service checks are others running?

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• Raid 5 with 4 disks on Debian automatically creates a spare drive

  - by Razer

  I'm trying to to create a RAID 5 with 4x 2TB disks on Debian 6. I followed the instructions from: http://zackreed.me/articles/38-software-raid-5-in-debian-with-mdadm I created the raid with following command: sudo mdadm --create --verbose /dev/md0 --auto=yes --level=5 --raid-devices=4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 After creating the RAID mdadm --detail /dev/md0 shows me: /dev/md0: Version : 1.2 Creation Time : Mon Jun 11 18:14:26 2012 Raid Level : raid5 Array Size : 5860535808 (5589.04 GiB 6001.19 GB) Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Update Time : Mon Jun 11 18:14:26 2012 State : clean, degraded Active Devices : 3 Working Devices : 4 Failed Devices : 0 Spare Devices : 1 Layout : left-symmetric Chunk Size : 512K Name : rsserver:0 (local to host rsserver) UUID : a68c3c99:1ef865e9:5a8a7bdc:64710ed8 Events : 0 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 2 8 49 2 active sync /dev/sdd1 3 0 0 3 removed 4 8 65 - spare /dev/sde1 Why is there a spare drive? I didn't create one. I don't want to use a spare drive.

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• Lustre - is this bad form?

  - by ethrbunny

  Im going to be consolidating several 'server rooms' into a single installation soon. Part of this effort will be finding a home for 5Tb (and growing) of files / logs. To this end Im looking at Lustre and appreciating its ability to scale. The big vendors want to sell me a $20K SAN to manage this but Im wondering about buying several iSCSI units (like this http://www.asacomputers.com/3U-iSCSI-Solution.html) and using VMs for the OSS machines. This would let me fail-over to cover problems and not require a dedicated system for each OSS. Given articles like this (http://h30565.www3.hp.com/t5/Feature-Articles/RAID-Is-Dead-Long-Live-RAID/ba-p/1422) that talk about how RAID is not keeping up with drive density Im leaning towards more disks with lower capacity each. Again - some akin to the iSCSI array above. Tell me why this is a terrible idea. Do I really need to invest in a PE710 for each OSS/OST?

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• Simple Ubuntu Server - Expanding disk space - adding a new drive LVM, RAID0 existing setup - how?

  - by NightWolf

  I have a 1TB ext4 partition mounted at / with all my data and Ubuntu 11.04 (natty) installed. Now this drive is almost full (I used it as a database server for some processing). RAID0 is ok, I can take a failure (touch wood). But I need a way to grow this partition. I have a new 1TB drive I want to add, however as my Ubuntu boot and all data is on the one partition I'm not sure how I can go about setting up a RAID0 or LVM array without loosing all my data. So the question is how can I extend my existing ext4 partition over two physical drives without losing data? Thanks!

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• Convert uploaded video files to mp4 using PHP [closed]

  - by Subin

  I created a PHP video uploading script. I need to convert these files to mp4 for HTML5 VIDEO PLAYER using PHP while uploading . How can I do that ? Here is the PHP code. <?php if(isset($_POST['submit'])){ $user=$_COOKIE['VisitorName']; include('config.php'); session_start(); $session_id='1'; //$session id $path = "/home/simsu/subins/videos/data/videos/"; $valid_formats = array("wmv", "ogv", "mp4", "3gp", "ogg"); if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST") { $name = $_FILES['uploadedfile']['name']; $size = $_FILES['uploadedfile']['size']; if(strlen($name)) { list($txt, $ext) = explode(".", $name); if(in_array($ext,$valid_formats)) { if($size<(100024*100024)) { $actual_image_name = $path.time().".mp4"; $tmp = $_FILES['uploadedfile']['tmp_name']; $upurl="http://vtube.subins.com/files/video?vid=".time(); $title=$_POST['vn']; mysql_query("INSERT INTO videos(title,user,url,vid,ext) VALUES ('$title', '$user','$upurl',NOW(),'$ext')"); echo '<br><h1>'.$_FILES['uploadedfile']['name'] . " uploaded.</h1>"; } else echo "<br><h1>Video file size max 100 MB"; } else echo "<br><h1>Invalid file format.."; } else echo "<br><h1>Please select a video..!"; exit; } } ?>

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• RAID1: Migrate HHD to SSD?

  - by OMG Ponies

  My current workstation uses an Adaptec 5805, with Win2008 mirrored between two 72 GB (10K?) savvio drives. My question is if there's a way to migrate the mirror to use SSDs - I've been looking at 90GB Corsair Force (Sandy Bridge) to replace the existing setup. If it's possible, without installing the OS fresh. If I replaced the mirrored drive with an SSD, would the array sync the drives? Then I could promote the SSD mirror to be the primary, and use the second SSD as the mirror. That'd be too easy... Or should use Ghost to get an image of the existing setup, apply it to the SSD for a new mirror to be setup on?

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• a flexible data structure for geometries

  - by AkiRoss

  What data structure would you use to represent meshes that are to be altered (e.g. adding or removing new faces, vertices and edges), and that have to be "studied" in different ways (e.g. finding all the triangles intersecting a certain ray, or finding all the triangles "visible" from a given point in the space)? I need to consider multiple aspects of the mesh: their geometry, their topology and spatial information. The meshes are rather big, say 500k triangles, so I am going to use the GPU when computations are heavy. I tried using arrays with vertices and arrays with indices, but I do not love adding and removing vertices from them. Also, using arrays totally ignore spatial and topological information, which I may need studying the mesh. So, I thought about using custom double-linked list data structures, but I believe doing so will require me to copy the data to array buffers before going on the GPU. I also thought about using BST, but not sure it fits. Any help is appreciated. If I have been too fuzzy and you require other information feel free to ask.

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• How do Unity 12.04/Compiz bindings really work?

  - by Daniel

  There is a bewildering array of places to set bindings, all inconsistent with one another. E.g. in Unity's System Settings having the Ctrl-key highlight the mouse position is an on/off choice. I like the feature, but not on such a prominent key where I keep activating it accidentally. The keyboard shortcuts allow only one binding per command, where I might like a convenient one on the external keyboard and an emergency alternative for when I'm on the road. Keyboard custom shortcuts has a nice interface, but allows only key bindings — besides it doesn't seem to work for me. So I activated CCSM Commands. There I have the choice of key-, mouse- and/or edge bindings. Whereas some places in CCSM offers only one or two of these binding possibilities, randomly at the whim of the programmer. I have not found a way to differentiate a mouse-drag from a click. E.g. I want <SuperMouse1-drag anywhere on a window to move it, while if I don't drag, it should be raise-lower. On the title bar I want the same without needing the <Super key. Now I find raise-lower only in System Settings where I can't assign a mouse binding. If therefore in CCSM I fallback to only lower and put move on the same binding, the window already gets lowered on mouse down, and I can then invisibly move it. Very useful! I have <Altasciicircum get in the way of an Emacs binding, with some to me useless popup overlay. I can find it nowhere, so I can't turn it off. So how can I go without these frontends until they have matured, and instruct Compiz directly, for example in the way Emacs or Sawfish have keymaps, and separate ones for each context, with inheritance?

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• Storing Tiled Level Data in J2ME game

  - by Alex

  I'm developing a J2ME game which uses tiled backgrounds for the levels. My question is how do I store this tile information in my game. At the moment it is stored as an array; with each number representing a different tile from the tile-sheet. This works well enough, however I don't like the fact that it is 'hard-coded' into the game because (at least in my opinion) it is harder to edit the levels, or design new ones. I was also thinking that it would be difficult if you wanted to add a 'level pack', I'm not sure on how this would be achieved though; it's not something I was planning on doing, I'm just curious. I was wondering if there was a way I could store level data in some external file and then load this in to the game. The problem is I don't know what the limitations are for J2ME regarding file I/O, can it read in any file like Java? I am aware of the RMS, but from my experience I don't think this would work (unless I am mistaken). Also, would loading the data in this way be too big a performance hit? Or is there another way I can achieve what I am trying to do. As I said, the way I have it at the moment works fine, and if this is the only viable option then it will suffice.

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• PHP Calculating Text to Content Ratio

  - by James

  I am using the following code to calculate text to code ratio. I think it is crazy that no one can agree on how to properly calculate the result. I am looking any suggestions or ideas to improve this code that may make it more accurate. <?php // Returns the size of the content in bytes function findKb($content){ $count=0; $order = array("\r\n", "\n", "\r", "chr(13)", "\t", "\0", "\x0B"); $content = str_replace($order, "12", $content); for ($index = 0; $index < strlen($content); $index ++){ $byte = ord($content[$index]); if ($byte <= 127) { $count++; } else if ($byte >= 194 && $byte <= 223) { $count=$count+2; } else if ($byte >= 224 && $byte <= 239) { $count=$count+3; } else if ($byte >= 240 && $byte <= 244) { $count=$count+4; } } return $count; } // Collect size of entire code $filesize = findKb($content); // Remove anything within script tags $code = preg_replace("@<script[^>]*>.+</script[^>]*>@i", "", $content); // Remove anything within style tags $code = preg_replace("@<style[^>]*>.+</style[^>]*>@i", "", $content); // Remove all tags from the system $code = strip_tags($code); // Remove Extra whitespace from the content $code = preg_replace( '/\s+/', ' ', $code ); // Find the size of the remaining code $codesize = findKb($code); // Calculate Percentage $percent = $codesize/$filesize; $percentage = $percent*100; echo $percentage; ?> I don't know the exact calculations that are used so this function is just my guess. Does anyone know what the proper calculations are or if my functions are close enough for a good judgement.

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• Collision detection between a sprite and rectangle in canvas

  - by Andy

  I'm building a Javascript + canvas game which is essentially a platformer. I have the player all set up and he's running, jumping and falling, but I'm having trouble with the collision detection between the player and blocks (the blocks will essentially be the platforms that the player moves on). The blocks are stored in an array like this: var blockList = [[50, 400, 100, 100]]; And drawn to the canvas using this: this.draw = function() { c.fillRect(blockList[0][0], blockList[0][1], 100, 100); } I'm checking for collisions using something along these lines in the player object: this.update = function() { // Check for collitions with blocks for(var i = 0; i < blockList.length; i++) { if((player.xpos + 34) > blockList[i][0] && player.ypos > blockList[i][1]) { player.xpos = blockList[i][0] - 28; return false; } } // Other code to move the player based on keyboard input etc } The idea is if the player will collide with a block in the next game update (the game uses a main loop running at 60Htz), the function will return false and exit, thus meaning the player won't move. Unfortunately, that only works when the player hits the left side of the block, and I can't work out how to make it so the player stops if it hits any side of the block. I have the properties player.xpos and player.ypos to help here.

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• VMWare Workstation Dev Machine Disks: one fast or four echofriendly raid?

  - by Avi

  I'm building a new dev computer. It will be running a few VMWare Worksation virtual machines - A dev machine running VS-2010, a build machine, a version-control machine, a web server for testing, a "personal" machine running office etc. I'll be connecting the computer to my stereo, so I'll also be running iTunes (possible on a dedicated VM) and I want the computer to be a silent one. I'll probably use an Antec P183 case. I was advised on Serverfault to use Raid10 for performance. Raid 10 uses 4 disks. So, my question is as follows: In terms of heat, noise, reliability, warranty, price, capacity and performance, what would you suggest: A Raid10 4 disk array using eco-friendly disks such as the $94 1TB Western Digital Caviar Green, or one high performance disk such as the 2TB Western Digital Caviar Black at $280?

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• What are the essential considerations for setting up systems in a location with unreliable power?

  - by dunxd

  I deal with a lot of remote offices located in parts of the world where the local grid power supply is unreliable. Power can go off anytime with no warning, with outages ranging from minutes to days Power fluctuation is wild, with spikes and brown outs Currently the offices will have some or all of the following: A generator, with an inverter, or some sort of manual switch A big UPS or battery array connecting a number of devices Several smaller APC UPS with computers attached Low cost Voltage Regulators sometimes connected between mains and UPS or device. I know that each of these things needs to be appropriately rated for the equipment to which it is connected (although I am not sure how to calculate the correct rating). The offices will generally have the following equipment (in varying quantities): some sort of internet connection device (VSAT router, ADSL modem, WiMax router) Cisco ASA 5505 firewall a bunch of PCs printers one server I don't seek to replace the advice of an electrician, but in some of these locations they only answer the questions you ask them, so I need to make sure I have enough understanding of the essentials to protect equipment from damage, and possibly get through some power cuts.

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• Installing 10.04 server on HP xw9400 Workstation with RAID 5

  - by Dave Long

  I have a workstation that was given to me that is a friggen powerhouse, so I figured I would set it up as my development and demo server. This is my first experience installing Ubuntu onto a RAID array and so far it has not been a fun one. I have been following the Advanced Installation guide for installing Ubuntu 10.04 server, and it says that there will be an option on the Partition Disks screen to manually create the partitions, but the only options I have are: Configure iSCSI volumes Undo changes to partitions Finish partitioning and write changes to disk Just before I got to that screen I got a message that said: One or more drives containing Serial ATA RAID configurations have been found. Do you wish to activate these RAID devices? It doesn't matter whether I answer yes or no to that, I still get the same Partition Disks screen. When I try to select Finish partitioning and write changes to disk I just get the No root file system error. Has anyone else experienced this, and how do I get past it? Can I not run Ubuntu on this machine?

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• What router settings to use for wireless home network

  - by Question Overflow

  While looking at the setting of my wireless router, I am bewildered by the array of options available. Despite searching on Wikipedia to try to understand the various acronyms, I am still clueless to decide what is the best setting to use although the default works fine. Rather than calling the internet service provider (ISP) to ask them the correct settings, I hope to learn more about the differences between some of the options listed below, so that I would be able to make a more informed decision from now onwards: PPPoE vs PPPoA LLC vs VC-Mux Bridge vs Routed In addition, I would also like to know the significance of the following MTU VPI VCI And whether or when I should manually specify DNS?

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