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  • setup lowcost image storage server with 24x SSD array to get high IOPS?

    - by Nenad
    I want to build let's name it a lowcost Ra*san which would host for our social site the images (many millions) we have 5 sizes of every photo with 3 KB, 7 KB, 15 KB, 25 KB and 80 KB per Image. My idea is to build a Server with 24x consumer 240 GB SSD's in Raid 6 which will give me some 5 TB Disk space for the photo storage. To have HA I can add a 2nd one and use drdb. I'm looking to get above 150'000 IOPS (4K Random reads). As we mostly have read access only and rarely delete photos i think to go with consumer MLC SSD. I read many endurance reviews and don't see there a problem as long we don't rewrite the cells. What you think about my idea? - I'm not sure between Raid 6 or Raid 10 (more IOPS, cost SSD). - Is ext4 OK for the filesystem - Would you use 1 or 2 Raid controller, with Extender Backplane If anyone has realized something similar i would be happy to get Real World numbers. UPDATE I have buy 12 (plus some spare) OCZ Talos 480GB SAS SSD Drive's they will be placed in a 12-bay DAS and attached to a PERC H800 (1GB NV Cache, manufactured by LSI with fastpath) Controller, I plan to setup Raid 50 with ext4. If someone is wondering about some benchmarks let me know what you would like to see.

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  • NSCollectionView: Can the same object not be in the array more than once or is this a bug?

    - by Sean
    I may be doing this all wrong, but I thought I was on the right track until I hit this little snag. Basically I was putting together a toy using NSCollectionView and trying to understand how to hook that all up using IB. I have a button which will add a couple of strings to the NSArrayController: The first time I press this button, my strings appear in the collection view as expected: The second time I press the button, the views scroll down and room is made - but the items don't appear to get added. I just see blank space: The button is implemented as follows (controller is a pointer to the NSArrayController I added in IB): - (IBAction)addStuff:(id)control { [controller addObjects:[NSArray arrayWithObjects:@"String 1",@"String 2",@"String 3",nil]]; } I'm not sure what I'm doing wrong. Rather than try to explain all the connections/binds/etc, if you need more info, I'd be grateful if you could just take a quick look at the toy project itself. UPDATE: After more experimentation as suggested by James Williams, it seems the problem stems from having multiple objects with the same memory address in the array. This confuses either NSArrayController or NSCollectionView (not sure which). Changing my addStuff: to this resulted in the behavior I originally expected: [controller addObjects:[NSArray arrayWithObjects:[NSMutableString stringWithString:@"String 1"],[NSMutableString stringWithString:@"String 2"],[NSMutableString stringWithString:@"String 3"],nil]]; So the question now, I guess, is if this is a bug I should report to Apple or if this is intended/documented behavior and I just missed it?

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  • How can I handle dynamic calculated attributes in a model in Django?

    - by bullfish
    In Django I calculate the breadcrumb (a list of fathers) for an geographical object. Since it is not going to change very often, I am thinking of pre calculating it once the object is saved or initialized. 1.) What would be better? Which solution would have a better performance? To calculate it at _init_ or to calculate it when the object is saved (the object takes about 500-2000 characters in the DB)? 2.) I tried to overwrite the _init_ or save() methods but I don't know how to use attributes of the just saved object. Accessing *args, **kwargs did not work. How can I access them? Do I have to save, access the father and then save again? 3.) If I decide to save the breadcrumb. Whats the best way to do it? I used http://www.djangosnippets.org/snippets/1694/ and have crumb = PickledObjectField(). Thats the method to calculate the attribute crumb() def _breadcrumb(self): breadcrumb = [ ] x = self while True: x = x.father try: if hasattr(x, 'country'): breadcrumb.append(x.country) elif hasattr(x, 'region'): breadcrumb.append(x.region) elif hasattr(x, 'city'): breadcrumb.append(x.city) else: break except: break breadcrumb.reverse() return breadcrumb Thats my save-Method: def save(self,*args, **kwargs): # how can I access the father ob the object? father = self.father # does obviously not work father = kwargs['father'] # does not work either # the breadcrumb gets calculated here self.crumb = self._breadcrumb(father) super(GeoObject, self).save(*args,**kwargs) Please help me out. I am working on this for days now. Thank you.

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  • Regex in Flex 3: How to Wrap Quotations Around a Dynamic String?

    - by Laxmidi
    Hi, I need some Regex help. I need to find beacon_ followed by an alphanumeric code and then wrap it in quotation marks. For something static, like the example, below it's straight forward. myReturn = myReturn.replace( 'id=beacon_80291ee9b3', 'id="beacon_80291ee9b3"'); But, my problem is that the part after beacon is a random alphanumeric code. (However, it is always the same length). For example, the beacon part could be: beacon_c8ac873136 beacon_dc83b5953e beacon_7a910d03d8 etc. The haystack that I'll search will look like: myReturn = "blah blah id=beacon_80291ee9b3 blah blah"; Thanks. -Laxmidi

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  • How Can I ReWrite flat link to a dynamic link and preserve the Query string?

    - by jeremysawesome
    Hello All, I am wanting to rewrite a url like: http://my.project/mydomain.com/ANY_NUMBER_OF_CATEGORIES/designer/4/designer-name/page.html to this: http://my.projects/mydomain.com/ANY_NUMBER_OF_CATEGORIES/page.html?designer=4 I would like to use mod-rewrite to accomplish this. Things to note: Any number of categories can be between 'mydomain.com/' and '/designer'. For instance the url could be http://my.project/mydomain.com/designer/4/designer-name/page.html or it could be http://my.project/mydomain.com/tops/shirts/small/designer/4/designer-name/page.html A query string may be provided in the original url that needs to be preserved in the rewritten url. For example url provided could be: http://my.project/mydomain.com/designer/4/designer-name/page.html?color=red&type=shirt Given the url above the resulting url would need to be: http://my.projects/mydomain.com/page.html?designer=4&color=red&type=shirt The order of the query string does not matter. The 'designer=4' part could come before or after the rest of the query string. I'm new to .htaccess and re-writes so any examples and or explanations would be greatly appreciated. Thank you very much.

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  • jquery autocomplete, $array source. how do i make it multiple?

    - by Toni Michel Caubet
    hello there! I'm using autocomplete so user can easly enter data on inputs, like this: <? $a = new etiqueta(0, ''); $b = $a->autocomplete_etiquetas(); ?> <script type="text/javascript"> function cargar_autocomplete_etiquetas(){ $("#tags").autocomplete({ source: [<? echo $b; ?>] }); } </script> $a = $b its an array with a result like: 'help','please',i','need','to,'be able to', 'select next item',' with autocomplete'; and i checked the ui documentation, but it doesn't fith with my source method.. any idea? I'm trying like this (edited with Bugai13 aportation): <? $a = new etiqueta(0, ''); $b = $a->autocomplete_etiquetas(); ?> <script type="text/javascript"> function cargar_autocomplete_etiquetas(){ $("#tags").autocomplete({ source: [<? echo $b; ?>], multiple: true, multipleSeparator: ", ", matchContains: true }); } </script> but i don't know how to do it.. any idea? are .push and .pop functions from the autocomplete? or shall i define, them? thanks again! PS: i'm getting adicted to this site! PS: come on dudes, i think the answer will be very usefull for many people PS: is it allowed to offer paypal reward?

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  • UITableView with dynamic cell heights -- what do I need to do to fix scrolling down?

    - by Ian Terrell
    I am building a teensy tiny little Twitter client on the iPhone. Naturally, I'm displaying the tweets in a UITableView, and they are of course of varying lengths. I'm dynamically changing the height of the cell based on the text quite fine: - (CGFloat)heightForTweetCellWithString:(NSString *)text { CGFloat height = Buffer + [text sizeWithFont:Font constrainedToSize:Size lineBreakMode:LineBreakMode].height; return MAX(height, MinHeight); } - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { NSString *text = // get tweet text for this indexpath return [self heightForTweetCellWithString:text]; } } I'm displaying the actual tweet cell using the algorithm in the PragProg book: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"TweetCell"; TweetCell *cell = (TweetCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [self createNewTweetCellFromNib]; } cell.tweet.text = // tweet text // set other labels, etc return cell; } When I boot up, all the tweets visible display just fine. However, when I scroll down, the tweets below are quite mussed up -- it appears that once a cell has scrolled off the screen, the cell height for the one above it gets resized to be larger than it should be, and obscures part of the cell below it. When the cell reaches the top of the view, it resets itself and renders properly. Scrolling up presents no difficulties. Here is a video that shows this in action: http://screencast.com/t/rqwD9tpdltd I've tried quite a bit already: resizing the cell's frame on creation, using different identifiers for cells with different heights (i.e. [NSString stringWithFormat:@"Identifier%d", rowHeight]), changing properties in Interface Builder... If there are additional code snippets I can post, please let me know. Thanks in advance for your help!

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  • Is there any Prototype Javascript function similar to Jquery Live to trace dynamic dom elements?

    - by Wbdvlpr
    Hi Event.observe(window,"load",function() { $$(".elem_classs").findAll(function(node){ return node.getAttribute('title'); }).each(function(node){ new Tooltip(node,node.title); node.removeAttribute("title"); }); }); Using above method, I can retrieve all elements having ".elem_class" and apply some javascript functions on them. But I have a modal/popup box which has some elements also having ".elem_class" and these dont get in the scope of findAll/each as they are loaded into the dom thru ajax. How do I apply the same to dynamically loaded elements as well? I am using Prototype Library. (I have used JQuery's Live function which keeps track of all future elements, but need to achieve something similar using Prototype) Thanks.

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  • How to get the dynamic generated content of an external ASP file using PhP?

    - by theCrius
    This is the situation: I've a PhP login page that check is an external ASP page has generated something (nickname). For example: i'm logged? So opening directly the asp page will display "nickname:thecrius" and nothing more. I'm not logged? So opening the ASP page will display nothing. Now i've to catch the "thecrius" string with a PhP page. Using file_get_contents only return me "nickname:", the "static" part of the asp page. What i'm doing wrong? Some codes: $aspSource = "http://www.domain.com/inc/whois.asp"; //ASP external $file = file_get_contents($aspSource); //get content of the asp page $start = strpos($file, "username:") + 9; //cutting off the "nickname:" $username = substr($file, $start); //get the username echo "URL-> $aspSource<br>Content-> $file<br>Start-> $start<br>Username-> $username<br>END"; But the result is only URL-> http://www.domain.com/inc/whois.asp Content-> username: Start-> 9 Username-> END Thanks in advance to anyone will help!

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  • Dynamic domain methods missing from grails service when injected into java service in grails app.

    - by Gordon C
    I had the idea that I would write my GroovyDao as a grails service. Next I would write a MyJavaService in java and locate it in the java sources dir in my grails app. MyJavaService contains a instance reference to groovyDao for spring injection. I would wire up in resources.groovy the MyJavaService with a groovyDao = ref("GroovyDao"). Everything starts up fine. However if I make call to MyJavaService any Domain method like Domain.list() returns a Method not found error. Any help is appreciated.

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  • Passing NULL value

    - by FFXIII
    Hi. I use an instance of NSXMLParser. I store found chars in NSMutableStrings that are stored in an NSMutableDictionary and these Dicts are then added to an NSMutableArray. When I test this everything seems normal: I count 1 array, x dictionnaries and x strings. In a detailview controller file I want to show my parsed results. I call the class where everthing is stored but I get (null) returned. This is what I do (wrong): XMLParser.h @interface XMLParser : NSObject { NSMutableArray *array; NSMUtableDictionary *dictionary; NSSMutabletring *element; } @property (nonatomic, retain) NSMutableArray *array; @property (nonatomic, retain) NSMutableDictionary *dictionary; @property (nonatomic, retain) NSMutableString *element; XMLParser.m @synthesize array, dictionary, element; //parsing goes on here & works fine //so 'element' is filled with content and stored in a dict in an array //and released at the end of the file In my controller file I do this: controller.h @class XMLParser; @interface controller : UIViewController { XMLParser *aXMLParser; } @property (nonatomic, retain) XMLParser *aXMLParser; controller.m #import "XMLParser.h" @synthesize aXMLParser; - (void)viewDidLoad { NSLog(@"test array: %@", aXMLParser.array); NSLog(@"test dict: %@", aXMLParser.dictionary); NSLog(@"test element: %@", aXMLParser.element); } When I test the value of my array, a dict or an element in the XMLParser.h file I get my result. What am I doing wrong so I can't call my results in my controller file? Any help is welcome, because I'm pretty stuck right now :/

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  • PHP array value becomes blank. What is going on?

    - by Michael Bruce
    I have written a web page that works fine expect for some weird behavior. The code below gets all expected values and populates them correctly except for $v-data["quick_phone_id"] and $v-data["quick_email_id"] which are integers. Those values come out blank in the string I am creating. The value for $v-data["id"] is another integer and works as expected. My only clue is that when I uncomment the commented out line, the code works properly. So I'm guessing this has to do with referencing getting broken for the array. Any ideas? I'd like to fix my code and my PHP knowledge. $contacts = ContactInfo::loadMyContacts($userId); $sb = new StringBuilder(); $idx = 0; //$vals = "vals: ".$contacts[0]->data["quick_phone_id"]; $sb->append(' dataRows = ['); foreach($contacts as $k => $v) { $sb->append('{ id:"'.strval($v->data["id"]).'",'); $sb->append('url:"edit_contact.php?id='.$v->data["id"].'",'); $sb->append('gname:"'.$v->data["given_name"].'",'); $sb->append('fname:"'.$v->data["family_name"].'",'); $sb->append('phone1id2:"'.strval($v->data["quick_phone_id"]).'",'); $sb->append('phone1type:"'.$v->data["quick_phone_type"].'",'); $sb->append('phone1:"'.$v->data["quick_phone"].'",'); $sb->append("email1id2:'".strval($v->data["quick_email_id"])."',"); $sb->append('email1type:"'.$v->data["quick_email_type"].'",'); $sb->append("email1:'".$v->data["quick_email"]."',"); $sb->append("dirty:false },\n"); } $sb->append('];');

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  • How can I bind a simple Javascript array to an MVC3 controller action method?

    - by Sergio Tapia
    Here is the javascript code I use to create the array and send it on it's way: <script type="text/javascript" language="javascript"> $(document).ready(function () { $("#update-cart-btn").click(function() { var items = []; $(".item").each(function () { var productKey = $(this).find("input[name='item.ProductId']").val(); var productQuantity = $(this).find("input[type='text']").val(); items[productKey] = productQuantity; }); $.ajax({ type: "POST", url: "@Url.Action("UpdateCart", "Cart")", data: items, success: function () { alert("Successfully updated your cart!"); } }); }); }); </script> The items object is properly constructed with the values I need. What data type must my object be on the backend of my controller? I tried this but the variable remains null and is not bound. [Authorize] [HttpPost] public ActionResult UpdateCart(object[] items) // items remains null. { // Some magic here. return RedirectToAction("Index"); }

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  • How to use Code Igniter to show Dynamic images via javascript(jQuery).

    - by aaroninfidel
    You can use the URL helper in Code Igniter to load CSS and Javascript with the base_url() method, but what if you have images dynamically being placed into your HTML via javascript? for example in my javascript file I've got var arrowimages={down:['downarrowclass', 'images/down.png', 23], right:['rightarrowclass', 'images/right.png']} and those images will be placed into whatever menu item I've specified has a drop down menu. but that file is a .js file so obviously the server won't load php inside of it. so, how can I set the base url for the JS? Thanks! -Aaron

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  • Define the base class or base functionality of a dynamic proxy (e.g. Castle, LinFu)

    - by Graham
    Hi, I've asked this in the NHibernate forumns but I think this is more of a general question. NHibernate uses proxy generators (e.g. Castle) to create its proxy. What I'd like to do is to extend the proxy generated so that it implements some of my own custom behaviour (i.e. a comparer). I need this because the following standard .NET behaviour fails to produce the correct results: //object AC is a concrete class collection.Contains(AC) = true //object AP is a proxy with the SAME id and therefore represents the same instance as concrete AC collection.Contains(AP) = false If my comparer was implemented by AP (i.e. do id's match) then collection.Contains(AP) would return true, as I'd expect if proxies were implicit. (NB: For those who say NH inherits from your base class, then yes it does, but NH can also inherit from an interface - which is what we're doing) I'm not at all sure this is possible or where to start. Is this something that can be done in any of the common proxy generators that NH uses?

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  • How can I change the tags/css class of some dynamic text based on output from a helper?

    - by Angela
    I have a repeated line which outputs something like: Call John Jones in -3 days (status) I have a helper called show_status(contact,email) which will output whether that particular email had been sent to that particular contact. If it is "sent," then that entire line should show up as "strike out." Similarly, if the number of days is -3 (<0), the line should be formatted in red. Here's my hack, but there must be a cleaner way to put the logic into the controller? I hard-code a value that wraps around the lines I want formatted, and assign the value based on a separate call to the same helper: <% for call in @campaign.calls %> <% if !show_call_status(@contact,call).blank? %> <%= strike_start = '<s>'%> <%= strike_end = '</s>' %> <% end %> <p> <%= strike_start %> <%= link_to call.title, call_path(call) %> on <%= (@contact.date_entered + call.days).to_s(:long) %> in <%= interval_email(@contact,call) %> days <%= make_call(@contact,call) %> <span class='status'><%= show_call_status(@contact,call) %></span> <%= strike_end %> </p> <% end %> I guess what I'd like to do is not have the if statement in the View. Not sure how to do this.

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  • How can I make a sub-domain point to a dynamic IP and the rest of the domain as it is hosted on a server with static IP?

    - by sleeping_dragon
    Basically, I have a domain mydomain.com hosted by a certain hosting company on its servers. I have access to the cpanel and can make changes a s per required. However, I want to host a dvr remote interface on one of its pages. The DVR is in my office which has a dynamic IP address. I first thought of using the numerous free DDNS services available. But then since I already own a domain name I thought of using that one. How do I do it?

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  • Is it possible to use Sphinx search with dynamic conditions?

    - by Fedyashev Nikita
    In my web app I need to perform 3 types of searching on items table with the following conditions: items.is_public = 1 (use title field for indexing) - a lot of results can be retrieved(cardinality is much higher than in other cases) items.category_id = {X} (use title + private_notes fields for indexing) - usually less than 100 results items.user_id = {X} (use title + private_notes fields for indexing) - usually less than 100 results I can't find a way to make Sphinx work in all these cases, but it works well in 1st case. Should I use Sphinx just for the 1st case and use plain old "slow" FULLTEXT searching in MySQL(at least because of lower cardinality in 2-3 cases)? Or is it just me and Sphinx can do pretty much everything?

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  • Would an array of SSD drives be able to succesfully substitute the system memory?

    - by Florin Mircea
    I watched a few videos trying to answer this. This video (youtube.com/watch?v=eULFf6F5Ri8) shows a bunch of guys stacking 24 SSD's reaching a peak of around 2GBps r/w. That's under the limit of the worst DDR3 in this list (memorybenchmark.net/write_ddr3_amd.html) - that shows DDR3 memory performance varying from 2.78 to 6.55 Gb per second, but that video is over 3 years old. This video (youtube.com/watch?v=27GmBzQWwP0) shows a more optimistic situation, but for PCI-E SSD drives: 5 drives peaking at around 4Gb. And this other video shows that stacking up more than 3 SSD's doesn't realistically offer a substantial added performance. This and the fact that in all benchmarks the drives act quite poorly when dealing with small files (5k file read/write averaging from 10MB to around 30-40MBps) as opposed to how native memory handles such files, seems to indicate a definite NO to this question. Also, the write life cycle is indeed limited and the drives might wear out quickly, as kindly pointed out by paddy. However, I wanted to get more opinions on this. Would it be possible to at least obtain current memory performance with SSD's in RAID 0? And if so, in what circumstances? I am assuming using this configuration with a Windows OS that has a memory pagefile resident to that stack of SSD's, thus making it very fast to work with.

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  • ASP MVC C#: Is it possible to pass dynamic values into an attribute?

    - by wh0emPah
    Okay I'm very new to C# and i'm trying to create a little website using ASP MVC2. I want to create my own authorization attribute. but i need to pass some values if this is possible. For example: [CustomAuthorize(GroupID = Method Parameter?] public ActionResult DoSomething(int GroupID) { return View(""); } I want to authorize the access to a page. but it depends on the value passed to the controller. So the authorization depends on the groupID. Is this possible to achieve this in any way?. Thanks in advance.

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  • Which workflow engine should I chose for implementing a dynamic reconfiguration of workflows?

    - by Raya
    I want to be able to interrupt a running workflow instance, say when a new activity is about to be invoked, and extract information both about the structure of the workflow and the data in the particular instance. Then I will consult with an external system and according to its response I will possibly alter the behaviour of the workflow. The options I would like to have are addition/removal of activities and altering parameters for the activities to be invoked. I am currently struggling with the engine it's best to go with. I have looked at WWF, Apache ODE, Oracle Workflow and Active BPEL and as far as I understand they can all provide me with the options I need. I would really appreciate any recommendations on which one will be the easiest to work with for my purpose and any restrictions either of the above might have that would prevent me from reaching my goal. Thanks

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  • algorithm - How to sort a 0/1 array with 2n/3 comparisons?

    - by Jackson Tale
    In Algorithm Design Manual, there is such an excise 4-26 Consider the problem of sorting a sequence of n 0’s and 1’s using comparisons. For each comparison of two values x and y, the algorithm learns which of x < y, x = y, or x y holds. (a) Give an algorithm to sort in n - 1 comparisons in the worst case. Show that your algorithm is optimal. (b) Give an algorithm to sort in 2n/3 comparisons in the average case (assuming each of the n inputs is 0 or 1 with equal probability). Show that your algorithm is optimal. For (a), I think it is fairly easy. I can choose a[n-1] as pivot, then do something like in quicksort partition, scan 0 to n - 2, find the middle point where left side is all 0 and right side is all 1, this take n - 1 comparisons. But for (b), I can't get a clue. It says "each of the n inputs is 0 or 1 with equal probability", so I guess I can assume the numbers of 0 and 1 equal? But how can I get a result which is related to 1/3? divide the whole array into 3 groups? Thanks

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  • How to get values of xml elements?

    - by user187580
    Hi, I have some xml data and I am trying to access some elements. The structure of data is as below (using print_r($data)). I can get $data->{'parent'}->title, it works but if I try to get value of href using $data->{'parent'}->link[0]->{'@attributes'}->href .. it doesnt work .. any ideas? Thanks SimpleXMLElement Object ( [@attributes] => Array ( [children] => 29 [modules] => 0 ) [title] => Test title [link] => Array ( [0] => SimpleXMLElement Object ( [@attributes] => Array ( [href] => data.php?id=2322 [rel] => self [type] => application/xml ) ) [1] => SimpleXMLElement Object ( [@attributes] => Array ( [href] => data.php?id=2342 [rel] => alternate [type] => text/html ) ) ) [parent] => SimpleXMLElement Object ( [@attributes] => Array ( [children] => 6 [modules] => 0 ) [title] => Top [link] => Array ( [0] => SimpleXMLElement Object ( [@attributes] => Array ( [href] => /data.php?id=5763 [rel] => self [type] => application/xml ) ) [1] => SimpleXMLElement Object ( [@attributes] => Array ( [href] => /data.php?id=2342 [rel] => alternate [type] => text/html ) ) ) ) )

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