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  • What characteristic of networking/TCP causes linear relation between TCP activity and latency?

    - by DeLongey
    The core of this problem is that our application uses websockets for real-time interfaces. We are testing our app in a new environment but strangely we're noticing an increasing delay in TCP websocket packets associated with an increase in websocket activity. For example, if one websocket event occurs without any other activity in a 1-minute period, the response from the server is instantaneous. However, if we slowly increase client activity the latency in server response increases with a linear relationship (each packet will take more time to reach the client with more activity). For those wondering this is NOT app-related since our logs show that our server is running and responding to requests in under 100ms as desired. The delay starts once the server processes the request and creates the TCP packet and sends it to the client (and not the other way around). Architecture This new environment runs with a Virtual IP address and uses keepalived on a load balancer to balance the traffic between instances. Two boxes sit behind the balancer and all traffic runs through it. Our host provider manages the balancer and we do not have control over that part of the architecture. Theory Could this somehow be related to something buffering the packets in the new environment? Thanks for your help.

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  • Need to find current connections in mysql media server log table.

    - by Roger
    Hi, I have a media server logging to a mysql database and it records a seperate row for each connect, play, stop, disconnect event. What I would like to do is find connect events that do not have a related disconnect event or play events that do not have a related stop event. date time category event clientId stream streamId =============================================================================== 2010-04-21 10:30:00 session connect 1 2010-04-21 10:30:05 stream start 1 stream1 1 2010-04-21 10:35:00 stream stop 1 stream1 1 2010-04-21 10:35:00 session disconnect 1 2010-04-21 10:35:00 session connect 2 2010-04-21 10:35:05 stream start 2 stream2 1 2010-04-21 10:35:08 session connect 3 2010-04-21 10:35:13 stream start 3 stream1 1 2010-04-21 10:37:05 stream stop 2 stream2 1 2010-04-21 10:37:10 stream start 2 stream1 2 I would like to be able to get a total of current sessions and in a seperate query, a total of current streams being played. Thanks, Roger.

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  • [SOLVED] Iphone NSXMLParser NSCFString memory leak

    - by atticusalien
    I am building an app that parses an rss feed. In the app there are two different types of feeds with different names for the elements in the feed, so I have created an NSXMLParser NSObject that takes the name of the elements of each feed before parsing. Here is my code: NewsFeedParser.h #import @interface NewsFeedParser : NSObject { NSInteger NewsSelectedCategory; NSXMLParser *NSXMLNewsParser; NSMutableArray *newsCategories; NSMutableDictionary *NewsItem; NSMutableString *NewsCurrentElement, *NewsCurrentElement1, *NewsCurrentElement2, *NewsCurrentElement3; NSString *NewsItemType, *NewsElement1, *NewsElement2, *NewsElement3; NSInteger NewsNumElements; } - (void) parseXMLFileAtURL:(NSString *)URL; @property(nonatomic, retain) NSString *NewsItemType; @property(nonatomic, retain) NSString *NewsElement1; @property(nonatomic, retain) NSString *NewsElement2; @property(nonatomic, retain) NSString *NewsElement3; @property(nonatomic, retain) NSMutableArray *newsCategories; @property(assign, nonatomic) NSInteger NewsNumElements; @end NewsFeedParser.m #import "NewsFeedParser.h" @implementation NewsFeedParser @synthesize NewsItemType; @synthesize NewsElement1; @synthesize NewsElement2; @synthesize NewsElement3; @synthesize newsCategories; @synthesize NewsNumElements; - (void)parserDidStartDocument:(NSXMLParser *)parser{ } - (void)parseXMLFileAtURL:(NSString *)URL { newsCategories = [[NSMutableArray alloc] init]; URL = [URL stringByReplacingOccurrencesOfString:@" " withString:@""]; URL = [URL stringByReplacingOccurrencesOfString:@"\n" withString:@""]; URL = [URL stringByReplacingOccurrencesOfString:@" " withString:@""]; //you must then convert the path to a proper NSURL or it won't work NSURL *xmlURL = [NSURL URLWithString:URL]; // here, for some reason you have to use NSClassFromString when trying to alloc NSXMLParser, otherwise you will get an object not found error // this may be necessary only for the toolchain [[NSURLCache sharedURLCache] setMemoryCapacity:0]; [[NSURLCache sharedURLCache] setDiskCapacity:0]; NSXMLNewsParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; // Set self as the delegate of the parser so that it will receive the parser delegate methods callbacks. [NSXMLNewsParser setDelegate:self]; // Depending on the XML document you're parsing, you may want to enable these features of NSXMLParser. [NSXMLNewsParser setShouldProcessNamespaces:NO]; [NSXMLNewsParser setShouldReportNamespacePrefixes:NO]; [NSXMLNewsParser setShouldResolveExternalEntities:NO]; [NSXMLNewsParser parse]; [NSXMLNewsParser release]; } - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError { NSString * errorString = [NSString stringWithFormat:@"Unable to download story feed from web site (Error code %i )", [parseError code]]; NSLog(@"error parsing XML: %@", errorString); UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [errorAlert show]; [errorAlert release]; [errorString release]; } - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{ NewsCurrentElement = [elementName copy]; if ([elementName isEqualToString:NewsItemType]) { // clear out our story item caches... NewsItem = [[NSMutableDictionary alloc] init]; NewsCurrentElement1 = [[NSMutableString alloc] init]; NewsCurrentElement2 = [[NSMutableString alloc] init]; if(NewsNumElements == 3) { NewsCurrentElement3 = [[NSMutableString alloc] init]; } } } - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{ if ([elementName isEqualToString:NewsItemType]) { // save values to an item, then store that item into the array... [NewsItem setObject:NewsCurrentElement1 forKey:NewsElement1]; [NewsItem setObject:NewsCurrentElement2 forKey:NewsElement2]; if(NewsNumElements == 3) { [NewsItem setObject:NewsCurrentElement3 forKey:NewsElement3]; } [newsCategories addObject:[[NewsItem copy] autorelease]]; [NewsCurrentElement release]; [NewsCurrentElement1 release]; [NewsCurrentElement2 release]; if(NewsNumElements == 3) { [NewsCurrentElement3 release]; } [NewsItem release]; } } - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { //NSLog(@"found characters: %@", string); // save the characters for the current item... if ([NewsCurrentElement isEqualToString:NewsElement1]) { [NewsCurrentElement1 appendString:string]; } else if ([NewsCurrentElement isEqualToString:NewsElement2]) { [NewsCurrentElement2 appendString:string]; } else if (NewsNumElements == 3 && [NewsCurrentElement isEqualToString:NewsElement3]) { [NewsCurrentElement3 appendString:string]; } } - (void)dealloc { [super dealloc]; [newsCategories release]; [NewsItemType release]; [NewsElement1 release]; [NewsElement2 release]; [NewsElement3 release]; } When I create an instance of the class I do like so: NewsFeedParser *categoriesParser = [[NewsFeedParser alloc] init]; if(newsCat == 0) { categoriesParser.NewsItemType = @"article"; categoriesParser.NewsElement1 = @"category"; categoriesParser.NewsElement2 = @"catid"; } else { categoriesParser.NewsItemType = @"article"; categoriesParser.NewsElement1 = @"category"; categoriesParser.NewsElement2 = @"feedUrl"; } [categoriesParser parseXMLFileAtURL:feedUrl]; newsCategories = [[NSMutableArray alloc] initWithArray:categoriesParser.newsCategories copyItems:YES]; [self.tableView reloadData]; [categoriesParser release]; If I run the app with the leaks instrument, the leaks point to the [NSXMLNewsParser parse] call in the NewsFeedParser.m. Here is a screen shot of the Leaks instrument with the NSCFStrings leaking: http://img139.imageshack.us/img139/3997/leaks.png For the life of me I can't figure out where these leaks are coming from. Any help would be greatly appreciated.

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  • Why would Windows use slower network interface despite route metrics?

    - by tim11g
    On my previous notebook, the Dell/Broadcom wireless adapter had an option to automatically disable wireless when a wired network is connected, so I never dealt with multiple active interfaces. My current system has an Intel wireless adapter, and they apparently haven't figured out how to turn it off when there is a wired connection. Unless I explicitly remember to disable wireless when docked, the connection is active. That shouldn't be a problem (in theory), since the route metric will cause traffic to go over the fastest network (as indicated by the lowest metric in the routing table). Apparently not - I'm running a backup and seeing the throughput at 25Mbps or so (which is consistent with 802.11g) when a perfectly good Gigabit Ethernet interface is also connected. IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.254 192.168.1.104 10 0.0.0.0 0.0.0.0 192.168.1.254 192.168.1.109 25 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 Windows has correctly identified the Ethernet interface (.104) and assigned it the lower (preferred) metric. So the Ethernet interface should be used exclusively, right? Why is the Ethernet connection not being used? What other factors are involved? (This is with Windows 7 if it makes a difference)

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  • Dual boot nt4 and windows 98

    - by ItFinallyWorks
    I am trying to dual boot nt4 and windows 98 se (don't laugh - old computer). I have seen Microsoft's instructions for doing this, but it limits windows 98 to have a Fat16 partition (NT4's NTLDR doesn't understand FAT32) and therefore only 2GB of disk space. I really need it to have more than that. I started with Win 98 (on the 1st partition), repartitioned the disk, then added NT4 on the 2nd partition. NT4 took over the bootloader (as expected), so NT4 boots, but Win 98 doesn't. Right now I am working in VMWare so I can use nonpersistent hard drives (IDE like the real computer) to recover from errors easily. I've tried using XPs NTLDR using the instructions here: http://www.nu2.nu/fixnt4/ , but I got weird errors from NT4 and it never really worked. If XP's NTLDR would work, that should be able to boot both OSes. I've also tried using GRUB. In theory that should work. In fact when booting from super grub disk, it does. But as soon as I install grub to disk, Win 98 boots, but NT 4 blue screens at boot with a 0x0000007b inaccessible_boot_device error (that can be alot of things see MS kb 822051). The incantation I'm using for GRUB 1 is rootnoverify (hd0,1) makeactive chainloader +1 boot So, anybody have some suggestions?

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  • sql server 2008 cluster hang when a heavy load is run

    - by Billy OT
    we have a sql server 2008 active/active cluster running on wondows 2008R2 O/S. 14GB RAM, 4xCPU. we have set a ceiling of 12GB for sql server. We're running an agent job which loads 3 million records to a database. during this load the job fails and the cluster seems to attempt to fail over to the other node but unsuccessfully i.e., the cluster address is no longer accessible. we have to manually fail the cluster node back. during the load on viewing task manager we can see that memory usage hits a max of 12.5GB and CPU at times hits 100% on all 4 CPU, but for the most part fluctuates at an average of about 60%. I suppose my question is, will a cluster try to fail over if memory or CPU are taking a heavy hit? or am i barking up the wrong tree? also any ideas why it wouldn't fully fail over? we've crawled through logs, of which there are a lot, and can't find anything useful. we've also tried recreating the issue but it ran successfully at a later time. Also 3 million rows doesn't seem like a lot but in terms of resources should 14GB RAM and 4xCPU not be sufficient? Further information on this, we ran the load again today and corrupted the database! We received the error message : LogWriter: Operating system error 170. It looks like, under the heavy load, the sql cluster attempted to fail over and in doing so migrated a lun (or drive) which meant the disk was no longer reachable. (this is just our theory). The database is now 'suspect' and requiring restoration. The 170 error above also indicates that on failing over to the other node, the sql service could not start as it was already in use, therefore it couldn't fail over fully?? But I'm wondering why would it need to fail over in the first place? My assumptions could be completely wrong on this, so any ideas would be appreciated.

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  • how to insert data field in a table is empty

    - by banita
    Hi iam making an application in vb as front end and backend as oracle . I want autogenerated id on click of new button.it works well if data is present in table but show error if the table is empty . What i need to insert so that it work when iam first time using the appliction . my button code is as Private Sub cmd_new_Click() Call txt_clear txt_name.Enabled = True Set rsCat = New ADODB.Recordset rsCat.Open "Category", conn, adOpenDynamic, adLockPessimistic If rsCat.EOF = rscat.BOF Then tempId = 1000 Else rsCat.MoveLast tempId = rsCat.Fields("Category_Id") + 1 End If txt_Id = tempId cmd_Save.Enabled = True cmd_new = False End Sub

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  • Kohana 2.3.4 ORM pivot table query

    - by anthony
    I'm trying to query a pivot table with Kohana's ORM and I'm wondering if there is a built in function I'm missing. Currently I only have 2 models setup for the tables "categories" and "products". There is a pivot table "categories_products", but I don't need a model for it when inserting data with this: $product = ORM::factory('product'); $product->add(ORM::factory('category', $addCat)); However, I can't figure out how to query it without creating a model for it. The "join_table" function only returns the name of the pivot table (which I thought selected the table at first). If you can save data to the pivot table without a model, it seems to me that you should be able to retrieve data in a similar way. Any ideas?

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  • AVAudioPlayer Output to Speaker Problem

    - by Max
    After searching around for how to send AVAudioPlayer output to the iPhone's speaker, I found this: http://stackoverflow.com/questions/1064846/iphone-audio-playback-force-through-internal-speaker Despite setting the category correctly to AVAudioSessionCategoryPlayAndRecord, this solution doesn't seem to be working for me and won't even let the build compile, giving me this error: "_AudioSessionSetProperty", referenced from: ... ... ld: symbol(s) not found collect2: ld returned 1 exit status Am I not including something? I'm importing AudioToolbox, AVFoundation, and CoreAudio. My class implements AVAudioSessionDelegate, AVAudioRecorderDelegate, AVAudioPlayerDelegate, and UITextFieldDelegate. Any help would be greatly appreciated!

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  • asp:CustomValidator / OnServerValidate

    - by Neil
    I have a CheckBoxList that I am trying to validate that at least one of the checkboxes is checked. Markup: <asp:CustomValidator ID="RequiredFieldValidator8" ValidationGroup="EditArticle" runat="server" ErrorMessage="At least one Category is required." OnServerValidate="topic_ServerValidate" /> <asp:CheckBoxList id="checkboxlistCategories" runat="server"></asp:CheckBoxList> Code-behind: protected void topic_ServerValidate(object source, ServerValidateEventArgs args) { int i = 0; foreach (ListItem item in checkboxlistCategories.Items) { if (item.Selected == true) i = i + 1; } if (i == 0) args.IsValid = false; else args.IsValid = true; } If I add ControlToValidate="checkboxlistCategories" in the CustomValidator control, it blows up! Am I missing something? Thanks in advance.

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  • Will disabling hyperthreading improve performance on our SQL Server install

    - by Sam Saffron
    Related to: Current wisdom on SQL Server and Hyperthreading Recently we upgraded our Windows 2008 R2 database server from an X5470 to a X5560. The theory is both CPUs have very similar performance, if anything the X5560 is slightly faster. However, SQL Server 2008 R2 performance has been pretty bad over the last day or so and CPU usage has been pretty high. Page life expectancy is massive, we are getting almost 100% cache hit for the pages, so memory is not a problem. When I ran: SELECT * FROM sys.dm_os_wait_stats order by signal_wait_time_ms desc I got: wait_type waiting_tasks_count wait_time_ms max_wait_time_ms signal_wait_time_ms ------------------------------------------------------------ -------------------- -------------------- -------------------- -------------------- XE_TIMER_EVENT 115166 2799125790 30165 2799125065 REQUEST_FOR_DEADLOCK_SEARCH 559393 2799053973 5180 2799053973 SOS_SCHEDULER_YIELD 152289883 189948844 960 189756877 CXPACKET 234638389 2383701040 141334 118796827 SLEEP_TASK 170743505 1525669557 1406 76485386 LATCH_EX 97301008 810738519 1107 55093884 LOGMGR_QUEUE 16525384 2798527632 20751319 4083713 WRITELOG 16850119 18328365 1193 2367880 PAGELATCH_EX 13254618 8524515 11263 1670113 ASYNC_NETWORK_IO 23954146 6981220 7110 1475699 (10 row(s) affected) I also ran -- Isolate top waits for server instance since last restart or statistics clear WITH Waits AS ( SELECT wait_type, wait_time_ms / 1000. AS [wait_time_s], 100. * wait_time_ms / SUM(wait_time_ms) OVER() AS [pct], ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS [rn] FROM sys.dm_os_wait_stats WHERE wait_type NOT IN ('CLR_SEMAPHORE','LAZYWRITER_SLEEP','RESOURCE_QUEUE', 'SLEEP_TASK','SLEEP_SYSTEMTASK','SQLTRACE_BUFFER_FLUSH','WAITFOR','LOGMGR_QUEUE', 'CHECKPOINT_QUEUE','REQUEST_FOR_DEADLOCK_SEARCH','XE_TIMER_EVENT','BROKER_TO_FLUSH', 'BROKER_TASK_STOP','CLR_MANUAL_EVENT','CLR_AUTO_EVENT','DISPATCHER_QUEUE_SEMAPHORE', 'FT_IFTS_SCHEDULER_IDLE_WAIT','XE_DISPATCHER_WAIT', 'XE_DISPATCHER_JOIN')) SELECT W1.wait_type, CAST(W1.wait_time_s AS DECIMAL(12, 2)) AS wait_time_s, CAST(W1.pct AS DECIMAL(12, 2)) AS pct, CAST(SUM(W2.pct) AS DECIMAL(12, 2)) AS running_pct FROM Waits AS W1 INNER JOIN Waits AS W2 ON W2.rn <= W1.rn GROUP BY W1.rn, W1.wait_type, W1.wait_time_s, W1.pct HAVING SUM(W2.pct) - W1.pct < 95; -- percentage threshold And got wait_type wait_time_s pct running_pct CXPACKET 554821.66 65.82 65.82 LATCH_EX 184123.16 21.84 87.66 SOS_SCHEDULER_YIELD 37541.17 4.45 92.11 PAGEIOLATCH_SH 19018.53 2.26 94.37 FT_IFTSHC_MUTEX 14306.05 1.70 96.07 That shows huge amounts of time synchronizing queries involving parallelism (high CXPACKET). Additionally, anecdotally many of these problem queries are being executed on multiple cores (we have no MAXDOP hints anywhere in our code) The server has not been under load for more than a day or so. We are experiencing a large amount of variance with query executions, typically many queries appear to be slower that they were on our previous DB server and CPU is really high. Will disabling Hyperthreading help at reducing our CPU usage and increase throughput?

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  • Latent Dirichlet Allocation, pitfalls, tips and programs

    - by Gregg Lind
    I'm experimenting with Latent Dirichlet Allocation for topic disambiguation and assignment, and I'm looking for advice. Which program is the "best", where best is some combination of easiest to use, best prior estimation, fast How do I incorporate my intuitions about topicality. Let's say I think I know that some items in the corpus are really in the same category, like all articles by the same author. Can I add that into the analysis? Any unexpected pitfalls or tips I should know before embarking? I'd prefer is there are R or Python front ends for whatever program, but I expect (and accept) that I'll be dealing with C.

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  • 24TB RAID 6 configuration

    - by Phil
    I am in charge of a new website in a niche industry that stores lots of data (10+ TB per client, growing to 2 or 3 clients soon). We are considering ordering about $5000 worth of 3TB drives (10 in a RAID 6 configuration and 10 for backup), which will give us approximately 24 TB of production storage. The data will be written once and remain unmodified for the lifetime of the website, so we only need to do a backup one time. I understand basic RAID theory, however I am not experienced with it. My question is, does this sound like a good configuration? What potential problems could this setup cause? Also, what is the best way to do a one-time backup? Have two RAID 6 arrays, one for offsite backup and one for production? Or should I backup the RAID 6 production array to a JBOD? EDIT: The data server is running Windows 2008 Server x64. EDIT 2: To reduce rebuild time, what would you think about using two RAID 5's instead of one RAID 6?

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  • Login failed for user 'XXX' on the mirrored sql server

    - by hp17
    We have 4 web servers that host our asp.net (3.5) application. Randomly, we get error messages like : 1) "Login failed for user 'userid'" 2) "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)" we are running sql2005 and have a principle and a mirror db (sync). When these exceptions are thrown, I look at the SQL error logs on the mirrored db and noticed the failed login messages in there. The principle db is running fine and the other web apps are working great. this will happen for maybe 10 min, then the app pool recycles and it starts hitting the principle db again. Is there a configuration I have incorrect? my theory is that our principle db is forwarding the request to the mirror, but that should never happen. any help??

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  • Resolve formatted table value in wix custom action

    - by Michael Stoll
    Hi, I've created certificate wix extension (extension of IisExtension). This includes a custom table, which is consumed by a custom action. A column is defined as follows: <columnDefinition name="Account" type="string" length="72" primaryKey="yes" modularize="property" category="formatted" description="..." /> This column contains values like "[Property]". When the custom action reads this column like this: hr = WcaGetRecordString(hRecCertificate, vcpqAccount, &pwzTemp); it get's the string "[Property]". But I need "PropertyValue". How can this string be resolved? Regards Michael

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  • Go with Native or using phonegap ?

    - by knightrider
    Hello, I was about to develop iphone app and I want suggestion from the expert since I am totally newbie in it. I have one classified website which is written in php and mysql. What I want to create is Iphone app which can view those classifieds. There will be no complicated function at first version. It will be have different categories and query and display according to the category. And if there's new classified ad, they will get push notification. What I want to know is, what should i go with ? Native or using phonegap ? Is phonegap supports push notification ? Is native app can just get the results through mysql ? or do i need to change it to sql lite ? Any speed different between native and phone gap ? Any advantages and disadvantages ? Thanks.

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  • Unrecognized configuration section rewriter

    - by Cristian Boariu
    Hi guyrs, I'm trying to implement Approach 3 from this Url Rewriting article. I've added all the required configuration (in web.config for the UrlRewriter module) but when i try to add this in web.config: <rewriter> <rewrite url="~/products/(.+)" to="~/products.aspx?category=$1" /> </rewriter> </configuration> it gives me: Unrecognized configuration section rewriter... Please let me know me WHY it tells me that i put in the wrong place that rewriter xml node? Thanks...

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  • LASER x Deskjet Printer

    - by Mike
    I am about to buy a color printer. I had a b&W laserjet printer in the past but since then I use deskjet for decades. I need a printer that can deliver high quality as these photo deskjet printers but I am tired of paying ink that costs $9,000 per gallon of ink (1 gallon = 3.785 liters = 300 cartridges = $9,000). So, I was pondering about buying a color laser, but I am not sure if these printers can deliver the same quality and worth the investment in terms of toner consumption. I remembered that my old laserjet printer was able to print 1100 pages per toner cartridge. The deskjet printers I have can print 500 pages per cartridge. Price by price, 2 deskjet cartridges have more or less the same cost as one toner cartridge and in theory prints almost the same. I am not sure if this is true for color lasers. What you guys can tell me about quality, toner cost and cost per page using laser or deskjet. Does it worths the change? Remember that a deskjet printer costs $50 and a laser printer costs $200. thanks.

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  • How to make parameters optional when using Rails named routes?

    - by Jason
    I have a named route: map.find '/find/:category/:state/:search_term/:permalink', :search_term=>nil, :controller=>'find', :action=>'show_match' and the following URL matches it & works OK: http://localhost:3000/find/cars/ca/TestSeachTerm/bumpedupphoto-test but if I take out the 2nd last parameter i.e. "TestSearchTerm", then the route fails to get matched, even though I have :search_term=nil in the route. http://localhost:3000/find/cars/ca//bumpedupphoto-test Can anyone see what I am doing wrong? Being trying to solve this for a few days now. Thanks!

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  • Seeking Functional Programming Lexicon

    - by Randall Schulz
    Hi, Knowing the argot of a field helps me a lot, especially since it allows me to converse intelligently with those who know a lot more than I, so I would like to find a good lexicon of Functional Programming terms. E.g., I repeatedly encounter these: Functor, Arrow, Category, Kleisli, Monad, Monoid, a veritable zoo of Morphisms, etc. I also notice many of these appear with prefixes such as "covariant", "co-", "endo-" etc. Of these, I can say I actually understand Monoid and Covariant and sort of get Monad, but the rest are still gibberish to me. (Note that I don't mean this list as exhaustive and I'm not looking to have these defined or described for me here, I'm looking for learning resources.) Can someone point me towards an FP lexicon? It need not be on-line, as long as it's possible to find it (and it's not a rare volume for which I'd have to pay many tens of dollars).

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  • Tomcat performing terribly for no apparent reason

    - by John
    We're running a game application .WAR on Tomcat 6 on an Amazon EC2 server, 8 core processor, 7gb RAM. The application uses a MySQL database hosted on Amazon RDS. This Facebook application takes ages to access when a mere 20-30 users are playing it. Big difference from 1-2 users. The entire .WAR is ~4mb, all static content hosted elsewhere. The server has never been close to running out of RAM. The CPU utilization has never been higher than 13.5-14%. Even with ~500 users that completely slowed everything to a standstill. The thread count or threadpools isn't close to being maxed out. I heightened maxthreads but it didn't make a noticeable difference. My theory is that Tomcat can only use one processor core, which would explain why it was slowed to a halt even though CPU usage was stably at 13-14% at the activity spike. But I'm struggling to understand why it would only use one CPU core. There is no processor cap in server.xml. The app contains several servlets (4 or 5). There is no mention of SingleThreadModel in the Java code. WHAT could be causing the application to run extremely slowly? If there is only 1-5 people on the application it runs fine. With 20-30 people it's barely contactable.

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  • Couldn't get connection factory client - fighting with Google Maps

    - by iie
    another day another problem, I finally managed to set up correctly google maps on my android application, or at least I thought I've done it, the whole progam starts, it even call the class which should "print" a map, but the only thing I can see is a grid with google label on it [ in the corner ]. I've checked the dalvik monitor and the error E/MapActivity(394): Couldn't get connection factory client occurs. I've find out on stackoverflow website that I should sent a gps signal or sth like this from dalvik monitor, and I've done it. Nothing happend, also I got the api key one more time, but nothing changed. here is map.xml <?xml version="1.0" encoding="utf-8"?> <!-- This file is /res/layout/mapview.xml --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:id="@+id/zoomin" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="+" android:onClick="myClickHandler" android:padding="12px" /> <Button android:id="@+id/zoomout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="-" android:onClick="myClickHandler" android:padding="12px" /> <Button android:id="@+id/sat" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Satellite" android:onClick="myClickHandler" android:padding="8px" /> <Button android:id="@+id/street" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Street" android:onClick="myClickHandler" android:padding="8px" /> <Button android:id="@+id/traffic" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Traffic" android:onClick="myClickHandler" android:padding="8px" /> <Button android:id="@+id/normal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Normal" android:onClick="myClickHandler" android:padding="8px" /> </LinearLayout> <com.google.android.maps.MapView android:id="@+id/mapview" android:layout_width="fill_parent" android:layout_height="wrap_content" android:clickable="true" android:apiKey="0zPcz1VYRSpLusufJ2JoL0ffl2uxDMovgpW319w" /> </LinearLayout> here is a MapMapa.java public class MapMapa extends MapActivity { private MapView mapView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.map); mapView = (MapView)findViewById(R.id.mapview); } public void myClickHandler(View target) { switch(target.getId()) { case R.id.zoomin: mapView.getController().zoomIn(); break; case R.id.zoomout: mapView.getController().zoomOut(); break; case R.id.sat: mapView.setSatellite(true); break; case R.id.street: mapView.setStreetView(true); break; case R.id.traffic: mapView.setTraffic(true); break; case R.id.normal: mapView.setSatellite(false); mapView.setStreetView(false); mapView.setTraffic(false); break; } } @Override protected boolean isLocationDisplayed() { return false; } @Override protected boolean isRouteDisplayed() { return false; } manifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="menu.dot" android:versionCode="1" ndroid:versionName="1.0"> <application android:label="@string/app_name" android:icon="@drawable/icon"> <uses-library android:name="com.google.android.maps" /> <activity android:name="MainActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".About"> android:label="@string/about_title" android:theme="@android:style/Theme.Dialog" > </activity> <activity android:name=".Exit"> andorid:label="@string/exit_title"> </activity> <activity android:name=".Options"> </activity> <activity android:name=".Start"> </activity> <activity android:name=".Create"> </activity> <activity android:name=".Where"> </activity> <activity android:name=".Proceed"> </activity> <activity android:name=".Finish"> </activity> <activity android:name=".Login"> </activity> <activity android:name=".OK"> </activity> <activity android:name=".UserPanel"> </activity> <activity android:name=".Managero"> </activity> <activity android:name=".Edition"> </activity> <activity android:name=".Done"> </activity> <activity android:name=".Delete"> </activity> <activity android:name=".MapMapa"> </activity> </application> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-sdk android:minSdkVersion="3" /> </manifest>

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  • VPN being blocked somewhere between either my BT2700HGV and DLink DFL-210

    - by Dom
    Hi, For some time I have been unable to get VPN working through my set up. I have a BT2700HGV Router (2 Wire Model) and as a firewall I have the Dlink DFL-210. You can't turn the firewall completely off on the BT2700HGV so I have it set to DMZplus mode for the Firewall. In theory this should then allow the VPN ports through. On the Firewall I have a series of rules set up and one is the pptp-allow rule which should allow access on the correct ports also. When I try to connect via VPN however the client machine gets an error 809. If I check the log on the Dlink firewall, I see this record: http://dl.dropbox.com/u/1041315/packetdrop.PNG The laptop I am testing the vpn with is connected directly to the BT2700HGV router and I am trying to VPN from it onto 81.138.86.217. I can't work out whether I have some sort of problem in the set up of the rules on my firewall or if the BT router (even though it's in DMZplus mode) is still blocking port 1723. I read somewhere that there where problems because BTs Openzone held onto this port for some reason. Any help would be greatly appreciated. If you need further screen shots or information then please let me know. I wasn't able to create new tags for the router and firewall name or insert the picture in as I am new to the forum. Dom :-)

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  • How do I get "Back to My Mac" (using MobileMe) from Windows?

    - by benzado
    I have a MobileMe subscription and a Mac at home with "Back to My Mac" enabled. When I'm away from home, this service lets me use another Mac to connect to my Mac back home and access file sharing, screen sharing, etc. As far as I know, the service doesn't use any proprietary protocols, so in theory I should also be able to get "Back to My Mac" from a Windows PC. This MacWorld article explains how it works. Basically, it uses Wide-Area Bonjour to give your Mac a domain name like hostname.username.members.mac.com. Remote computers can find your Mac using that address, then connect to it using a private VPN. The "Wide Area Bonjour" part seems to make it a little more complicated than simply a regular domain name, though. Note that I'm not interested in using the methods described by LifeHacker, which doesn't use the MobileMe service at all. I don't want to use a totally different dynamic DNS service. I'd like to use the one I'm already paying for, or at least find out why that's not possible from Windows. Also, my primary problem is finding a network route back to my mac... once I've got that I know how to enable services so that Windows can talk to it. UPDATE: Based on some additional research, it appears that Apple is only assigning IPv6 addresses to the hostname.username.members.mac.com names. So any solution will require enabling IPv6 support on Windows, if possible.

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  • "Tool tip" covered by ToolStripItems if they have dropdown items?

    - by Theis
    In Windows Forms - if the dropdown items of a MenuStrip has tooltips and dropdown items themselves the tooltip will have about a 50% chance of showing up below the ToolStripItems. What is the workaround? To repro you can create the MenuStrip in Visual Studio or just add the following code to a form and then try to hover your mouse over the menu items to get a tooltip: //Make a menu strip MenuStrip menu = new MenuStrip(); this.Controls.Add(menu); //Add category "File" ToolStripMenuItem fileItem = new ToolStripMenuItem("File"); menu.Items.Add(fileItem); //Add items for (int i = 0; i < 10; i++) { ToolStripMenuItem item = new ToolStripMenuItem("item"); item.ToolTipText = "item tooltip"; item.DropDownItems.Add("sub item"); fileItem.DropDownItems.Add(item); } I am using .NET 3.5

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