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  • Read from plist insted of Code array

    - by BoSoud
    Hi Guys am Using [URL="http://www.iphonesdkarticles.com/2009/01/uitableview-searching-table-view.html"]UITableView - Searching table view[/URL] its really nice easy tutorial but i really have bad time try to read from plist that what i did change - (void)viewDidLoad { [super viewDidLoad]; //Initialize the array. listOfItems = [[NSMutableArray alloc] init]; TableViewAppDelegate *AppDelegate = (TableViewAppDelegate *)[[UIApplication sharedApplication] delegate]; listOfItems = [AppDelegate.data objectForKey:@"Countries"]; //Initialize the copy array. copyListOfItems = [[NSMutableArray alloc] init]; //Set the title self.navigationItem.title = @"Countries"; //Add the search bar self.tableView.tableHeaderView = searchBar; searchBar.autocorrectionType = UITextAutocorrectionTypeNo; searching = NO; letUserSelectRow = YES; } and This How i read plist from My AppDelegate.m - (void)applicationDidFinishLaunching:(UIApplication *)application { NSString *Path = [[NSBundle mainBundle] bundlePath]; NSString *DataPath = [Path stringByAppendingPathComponent:@"Data.plist"]; NSDictionary *tempDict = [[NSDictionary alloc] initWithContentsOfFile:DataPath]; self.data = tempDict; [tempDict release]; // Configure and show the window [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; } and this my plist <plist version="1.0"> <dict> <key>Countries</key> <array> <array> <string>USA</string> </array> <dict/> </array> </dict> </plist> and i get this error *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFArray objectForKey:]: unrecognized selector sent to instance 0x1809dc0' help please am stock with this

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  • powershell missing member methods in array

    - by Andrew
    Hi Guys I have (yet another) powershell query. I have an array in powershell which i need to use the remove() and split commands on. Normally you set an array (or variable) and the above methods exist. On the below $csv2 array both methods are missing, i have checked using the get-member cmd. How can i go about using remove to get rid of lines with nan. Also how do i split the columns into two different variables. at the moment each element of the array displays one line, for each line i need to convert it into two variables, one for each column. timestamp Utilization --------- ----------- 1276505880 2.0763250000e+00 1276505890 1.7487730000e+00 1276505900 1.6906890000e+00 1276505910 1.7972880000e+00 1276505920 1.8141900000e+00 1276505930 nan 1276505940 nan 1276505950 0.0000000000e+00 $SystemStats = (Get-F5.iControl).SystemStatistics $report = "c:\snmp\data" + $gObj + ".csv" ### Allocate a new Query Object and add the inputs needed $Query = New-Object -TypeName iControl.SystemStatisticsPerformanceStatisticQuery $Query.object_name = $i $Query.start_time = $startTime $Query.end_time = 0 $Query.interval = $interval $Query.maximum_rows = 0 ### Make method call passing in an array of size one with the specified query $ReportData = $SystemStats.get_performance_graph_csv_statistics( (,$Query) ) ### Allocate a new encoder and turn the byte array into a string $ASCII = New-Object -TypeName System.Text.ASCIIEncoding $csvdata = $ASCII.GetString($ReportData[0].statistic_data) $csv2 = convertFrom-CSV $csvdata $csv2

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  • C++ boost thread id and Singleton

    - by aaa
    hi. Sorry to flood so many questions this week. I assume thread index returned by thread.get_id is implementation specific. In case of the pthreads, is index reused? IE, if thread 0 runs and joins, is thread launched afterwords going to have a different ID? the reason I ask this is a need to implement Singleton pattern with a twist: each thread gets its own instance. I know it sounds very crazy, but threads control hardware (cuda) which does not permit device memory sharing. What is a good way to implement such pattern?

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  • D_WIN32_WINNT compiler warning with Boost

    - by bobber205
    Not sure what to make of this error. Added -D_WIN32_WINNT=0x0501 to Visual Studio's "Command Line" options under Project Properties but it says it doesn't recognize it and the warning still appears. I am also not sure how to add the Preprocessor Definition. :) Thanks for any help! 1Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. For example: 1- add -D_WIN32_WINNT=0x0501 to the compiler command line; or 1- add _WIN32_WINNT=0x0501 to your project's Preprocessor Definitions.

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  • Array values changing unexpectedly

    - by Lizard
    I am using cakephp 1.2 and I have an array that appears to have a value change even though that variable is not being manipulated. Below is the code to that is causing me trouble. PLEASE NOTE - UPDATE Changing the variable name makes no difference to the outcome, The values get changed somewhere between the two print_r calls, and I can't see why the $this-find would do this . echo "Start of findCountByString()"; print_r($myArr); $test = $this->find('count', array( 'conditions' => $conditions, 'joins' => array('LEFT JOIN `articles_entities` AS ArticleEntity ON `ArticleEntity`.`article_id` = `Article`.`id`'), 'group' => 'Article.id' )); echo "End of findCountByString()"; print_r($myArr); I am getting the following output: Start of findCountByString() Array ( [0] => 4bdb1d96-c680-4c2c-aae7-104c39d70629 [1] => 4bdb1d6a-9e38-479d-9ad4-105c39d70629 [2] => 4bdb1b55-35f0-4d22-ab38-104e39d70629 [3] => 4bdb25f4-34d4-46ea-bcb6-104f39d70629 ) End of findCountByString() Array ( [0] => 4bdb1d96-c680-4c2c-aae7-104c39d70629 [1] => 4bdb1d6a-9e38-479d-9ad4-105c39d70629 [2] => 4bdb1b55-35f0-4d22-ab38-104e39d70629 [3] => '4bdb25f4-34d4-46ea-bcb6-104f39d70629' # This is now in inverted commas ) The the value in my array have changed, and I don't know why? Any suggestions?

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  • Recursive function for multidimensional array

    - by moja
    This is my code, and I need your help to understand it. <?php $tree = array( array( 'name' => 'Item-1', 'children' => array()), array('name' => 'Item-2', 'children' => array( array('name' => 'Item-2-1', 'children' => array()), )), array('name' => 'Item-3', 'children' => array( array('name' => 'Item-3-1', 'children' => array()), array('name' => 'Item-3-2', 'children' => array( array('name' => 'Item-3-2-1', 'children' => array()), array('name' => 'Item-3-2-2', 'children' => array()), array('name' => 'Item-3-2-3', 'children' => array( array('name' => 'Item-3-2-3-1', 'children' => array()), )), )), )), ); What i need is one recursive function, which will return all names (name). For example: Item-1 Item-2 Item-2-1 Item-3 Item-3-1 Item-3-2 ........ Thanks for your help.

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  • RAID Array performance on an HP Proliant ML350 G5 Smart Array E200i

    - by Nate Pinchot
    We have a client who is complaining about performance of an application which utilizes an MS SQL database. They do not believe the performance issues are the fault of the application itself. The Smart Array E200i RAID controller has 128MB cache and we have the cache set to 75% read/25% write. The disk array set to enable write caching. Recently we ran a disk performance test using SQLIO based on this guide. We used a 10 GB file for the test found that the average sequential read rate was ~60 MB/sec (megabytes/sec) and the average random read rate was ~30 MB/sec. Are these numbers on par for what the server should be performing? Better than on par? Horrible? Amazing?

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  • How to Test a Multi-Tenant App with support for multiple domains

    - by asifch
    HI, we are building a multi-tenant application, which will support that each tenant can have a unique top level domain, the application is build using the asp.net 3.5 and SQL servr 2005, while each tenant will have different database. I have seen a number of questions about the similar applications on the StackOverFlow, but none of them is related to the Testing, I want to know is how one can test the application in a development environment, specially How can we test that each customer connects to his own DB based on the URL. how can we emulate different domains on the local system. like abc.com and xyz.com all goes to dev machine's IIS. Any recommendations which might help us in the developing process of such an application.

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  • Injecting tenant repositories with StructureMap in a multi-tenant MVC applicaiton

    - by FreshCode
    I'm implementing StructureMap in a multi-tenant ASP.NET MVC application to inject instances of my tenant repositories that retrieve data based on an ITenantContext interface. The Tenant in question is determined from RouteData in a base controller's OnActionExecuting. How do I tell StructureMap to construct TenantContext(tenantID); where tenantID is derived from my RouteData or some base controller property? Base Controller Given the following route: {tenant}/{controller}/{action}/{id} My base controller retrieves and stores the correct Tenant based on the {tenant} URL parameter. Using Tenant, a repository with an ITenantContext can be constructed to retrieve only data that is relevant to that tenant. Based on the other DI questions, could AbstractFactory be a solution?

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  • Multi tenancy with Unity

    - by Savvas Sopiadis
    Hi everybody! I'm trying to implement this scenario using Unity and i can't figure out how this could be done: the same web application (ASP.NET MVC) should be made accessible to more than one client (multi-tenant). The URL of the web site will differentiate the client (this i know how to get). So getting the URL one could set the (let's call it) IConnectionStringProvider parameter (which will be afterward injected into IRepository and so on). Through which mechanism (using Unity) do i set the IConnectionStringProvider parameter at run time? I have done this in the past using Windsor & IHandlerSelector (see this) but it's my first attempt using Unity. Any help is deeply appreciated! Thanks in advance

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  • Injecting multi-tenant repositories with StructureMap in ASP.NET MVC

    - by FreshCode
    I'm implementing StructureMap in a multi-tenant ASP.NET MVC application to inject instances of my tenant repositories that retrieve data based on an ITenantContext interface. The Tenant in question is determined from RouteData in a base controller's OnActionExecuting. How do I tell StructureMap to construct TenantContext(tenantID); where tenantID is derived from my RouteData or some base controller property? Base Controller Given the following route: {tenant}/{controller}/{action}/{id} My base controller retrieves and stores the correct Tenant based on the {tenant} URL parameter. Using Tenant, a repository with an ITenantContext can be constructed to retrieve only data that is relevant to that tenant. Based on the other DI questions, could AbstractFactory be a solution?

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  • How can I create and manage a multi-tenant ASP MVC application

    - by Wizzarding
    Hi, I want to create a multi-tenant application that uses the hostname to determine the customer. For example: CustomerOne.myapp.com AnotherCo.myapp.com AndOneMore.myapp.com ... I can do the database and security side with no problems, I can also get the hostname from the URL, but what I am struggling to find out is how to create the basic plumbing that would allow a new customer to sign up online, provide their company name, and for the application to create the new URL, ready to be used straight away. Can anyone help? Thanks, Rob.

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  • Multi-dimensional array in php

    - by pundit
    Hi all, I would like to create a multi-dimensional array with two variables but don't know how. This is what i have so far; $_SESSION['name'][] = $row_subject['name']; $_SESSION['history'][]= $_SERVER['REQUEST_URI']; I wanted to know if this is possible? $_SESSION['name'][] = $row_subject['name'],$_SERVER['REQUEST_URI']; i want to get the name of a programme which is generated via a data base and also to retrieve the url. What i am actually doing once the name is retrieve, i want to make that a link which the url would be necessary. any help would be appreciated. Thanks

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  • accumulator don't compile

    - by Abruzzo Forte e Gentile
    HI All I am using boost accumulators. These 2 lines use to work fine with current version of boost in LInux. accumulator_set< double, stats< tag::covariance<double, tag::covariate1> > > acc_cov; accumulator_set< double, stats< tag::variance > > acc_var; When I moved to a Sun machine where it is installed boost v1.40 I have this building error "/opt/boost/boost/accumulators/framework/depends_on.hpp", line 276: Error:<no tag> cannot be initialized in a constructor. "/opt/boost/boost/fusion/container/list/cons.hpp", line 85: Where: While instantiating "boost::accumulators::detail::accumulator_wrapper<int, int>::accumulator_wrapper(const boost::accumulators::detail::accumulator_wrapper<int, int>&)". "/opt/boost/boost/fusion/container/list/cons.hpp", line 85: Where: Instantiated from non-template code. 1 Error(s) Do you know how can I fix those errors and why I have this issue? Thanks AFG

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  • performance monitoring tools for multi-tenant web application

    - by Anton
    We have a need to monitor performance of our java web app. We are looking for some tolls which can help us with this task. The major difficulty is that we are SaaS provider with multi-tenant server architecture with hundreds of customers running on the same hardware. So far we tried commercial products like DynaTrace and Coradinat but unfortunately they don't get the job done so far. What we need is a simple report which would tell us if we had performance problems on each customer site in a specified period of time. Mostly it will be response time per customer but also we will need some more specifics based on the URLs. please let me know if someone had any experience with setting up such monitoring. Thanks!

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  • Data-separation in a Symfony Multi-tenant app using Doctrine

    - by Prasad
    I am trying to implement a multi-tenant application, that is - data of all clients in a single database - each shared table has a tenant_id field to separate data I wish to achieve data separation by adding where('tenant_id = ', $user->getTenantID()) {pseudoc-code} to all SELECT queries I could not find any solution up-front, but here are possible approaches I am considering. 1) crude approach: customizing all fetchAll and fetchOne functions in every class (I will go mad!) 2) using listeners: possibly coding for the preDqlSelect event and adding the 'where' to all queries 3) override buildQuery(): could not find an example of this for front-end 4) implement contentformfilter: again need a pointer Would appreciate if someone could validate these & comment on efficieny, suitability. Also, if anyone has achieved multitenancy using another strategy, pl share. Thanks

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  • matlab - int array to binary array

    - by asel
    hi, currently in matlab i have int array a=[3,4,5,6,7]; i want to convert it to binary array with four bits each. for the above int array i would get the following binary array abinary=[0,0,1,1, 0,1,0,0, 0,1,0,1, 0,1,1,0, 0,1,1,1]; is there any fast way to do it? thanks a lot!

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  • PHP: Condense array of similar strings into one merged array

    - by Matt Andrews
    Hi everyone. Working with an array of dates (opening times for a business). I want to condense them to their briefest possible form. So far, I started out with this structure Array ( [Mon] => 12noon-2:45pm, 5:30pm-10:30pm [Tue] => 12noon-2:45pm, 5:30pm-10:30pm [Wed] => 12noon-2:45pm, 5:30pm-10:30pm [Thu] => 12noon-2:45pm, 5:30pm-10:30pm [Fri] => 12noon-2:45pm, 5:30pm-10:30pm [Sat] => 12noon-11pm [Sun] => 12noon-9:30pm ) What I want to achieve is this: Array ( [Mon-Fri] => 12noon-2:45pm, 5:30pm-10:30pm [Sat] => 12noon-11pm [Sun] => 12noon-9:30pm ) I've tried writing a recursive function and have managed to output this so far: Array ( [Mon-Fri] => 12noon-2:45pm, 5:30pm-10:30pm [Tue-Fri] => 12noon-2:45pm, 5:30pm-10:30pm [Wed-Fri] => 12noon-2:45pm, 5:30pm-10:30pm [Thu-Fri] => 12noon-2:45pm, 5:30pm-10:30pm [Sat] => 12noon-11pm [Sun] => 12noon-9:30pm ) Can anybody see a simple way of comparing the values and combining the keys where they're similar? My recursive function is basically two nested foreach() loops - not very elegant. Thanks, Matt EDIT: Here's my code so far, which produces the 3rd array above (from the first one as input): $last_time = array('t' => '', 'd' => ''); // blank array for looping $i = 0; foreach($final_times as $day=>$time) { if($last_time['t'] != $time ) { // it's a new time if($i != 0) { $print_times[] = $day . ' ' . $time; } // only print if it's not the first, otherwise we get two mondays } else { // this day has the same time as last time $end_day = $day; foreach($final_times as $day2=>$time2) { if($time == $time2) { $end_day = $day2; } } $print_times[] = $last_time['d'] . '-' . $end_day . ' ' . $time; } $last_time = array('t' => $time, 'd' => $day); $i++; }

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  • strange array in php

    - by tunpishuang
    here i wrote a function , it's general purpose is to get an array of the depIds under the parent root $depId. i use recursion method to get the array. public function getEmpsByDep($depId){ $query = "select * from ".SQLPREFIX."department where id_parent=".$depId; $stmt=$this->db->query($query); while(($row=$this->db->fetch_assoc($stmt))==true) { if($this->hasChildNode($row['DEPID'])) { $depId = $row['DEPID']; self::getEmpsByDep($depId); } else { $arr[]=$row['DEPID']; } } return ($arr); } while i think it should return a 1D array of the depid.but it return a strange 2D array like this: array(4) { [0]=> string(2) "11" [1]=> string(2) "12" [2]=> string(2) "13" [3]=> string(2) "14" } array(3) { [0]=> string(2) "19" [1]=> string(2) "20" [2]=> string(2) "21" } array(3) { [0]=> string(2) "15" [1]=> string(2) "16" [2]=> string(2) "17" } array(8) { [0]=> string(1) "2" [1]=> string(1) "4" [2]=> string(1) "5" [3]=> string(1) "6" [4]=> string(1) "7" [5]=> string(1) "8" [6]=> string(1) "9" [7]=> string(2) "10" } here is the table structure and data sample: $query[]="create table ".$sqltblpre."department( depId number(10) not null primary key, depName varchar2(50) not null, id_parent number(10) )"; //department(?????) $index=1; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'??',0)"; //1 $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',0)"; //2 $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',0)"; //3 $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',0)"; //4 $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',0)"; //5 $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',0)"; //6 $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'?????',0)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'????',0)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'????',0)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'????',0)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'??',1)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'??',1)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',1)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'??',1)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'??',3)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',3)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',3)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',3)"; //18 $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'??',18)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'???',18)"; $query[] = "INSERT INTO ".$sqltblpre."department values(".$index++.",'??',18)"; so in a word, how can i get the 1D array thought the right code of this function?

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  • perl sorting an array of hashes

    - by srk
    use strict; my @arr; $arr[0][0]{5} = 16; $arr[0][1]{6} = 11; $arr[0][2]{7} = 25; $arr[0][3]{8} = 31; $arr[0][4]{9} = 16; $arr[0][5]{10} = 17; sort the array based on hash values so this should change to $arr[0][0]{6} = 11; $arr[0][1]{9} = 16; $arr[0][2]{5} = 16; $arr[0][3]{10} = 17; $arr[0][4]{7} = 25; $arr[0][5]{8} = 31; first sort on values in the hash.. when the values are same reverse sort based on keys... Please tell me how to do this.. Thank you

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  • Benchmarking MySQL Replication with Multi-Threaded Slaves

    - by Mat Keep
    0 0 1 1145 6530 Homework 54 15 7660 14.0 Normal 0 false false false EN-US JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:Cambria; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin; mso-ansi-language:EN-US;} The objective of this benchmark is to measure the performance improvement achieved when enabling the Multi-Threaded Slave enhancement delivered as a part MySQL 5.6. As the results demonstrate, Multi-Threaded Slaves delivers 5x higher replication performance based on a configuration with 10 databases/schemas. For real-world deployments, higher replication performance directly translates to: · Improved consistency of reads from slaves (i.e. reduced risk of reading "stale" data) · Reduced risk of data loss should the master fail before replicating all events in its binary log (binlog) The multi-threaded slave splits processing between worker threads based on schema, allowing updates to be applied in parallel, rather than sequentially. This delivers benefits to those workloads that isolate application data using databases - e.g. multi-tenant systems deployed in cloud environments. Multi-Threaded Slaves are just one of many enhancements to replication previewed as part of the MySQL 5.6 Development Release, which include: · Global Transaction Identifiers coupled with MySQL utilities for automatic failover / switchover and slave promotion · Crash Safe Slaves and Binlog · Optimized Row Based Replication · Replication Event Checksums · Time Delayed Replication These and many more are discussed in the “MySQL 5.6 Replication: Enabling the Next Generation of Web & Cloud Services” Developer Zone article  Back to the benchmark - details are as follows. Environment The test environment consisted of two Linux servers: · one running the replication master · one running the replication slave. Only the slave was involved in the actual measurements, and was based on the following configuration: - Hardware: Oracle Sun Fire X4170 M2 Server - CPU: 2 sockets, 6 cores with hyper-threading, 2930 MHz. - OS: 64-bit Oracle Enterprise Linux 6.1 - Memory: 48 GB Test Procedure Initial Setup: Two MySQL servers were started on two different hosts, configured as replication master and slave. 10 sysbench schemas were created, each with a single table: CREATE TABLE `sbtest` (    `id` int(10) unsigned NOT NULL AUTO_INCREMENT,    `k` int(10) unsigned NOT NULL DEFAULT '0',    `c` char(120) NOT NULL DEFAULT '',    `pad` char(60) NOT NULL DEFAULT '',    PRIMARY KEY (`id`),    KEY `k` (`k`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 10,000 rows were inserted in each of the 10 tables, for a total of 100,000 rows. When the inserts had replicated to the slave, the slave threads were stopped. The slave data directory was copied to a backup location and the slave threads position in the master binlog noted. 10 sysbench clients, each configured with 10 threads, were spawned at the same time to generate a random schema load against each of the 10 schemas on the master. Each sysbench client executed 10,000 "update key" statements: UPDATE sbtest set k=k+1 WHERE id = <random row> In total, this generated 100,000 update statements to later replicate during the test itself. Test Methodology: The number of slave workers to test with was configured using: SET GLOBAL slave_parallel_workers=<workers> Then the slave IO thread was started and the test waited for all the update queries to be copied over to the relay log on the slave. The benchmark clock was started and then the slave SQL thread was started. The test waited for the slave SQL thread to finish executing the 100k update queries, doing "select master_pos_wait()". When master_pos_wait() returned, the benchmark clock was stopped and the duration calculated. The calculated duration from the benchmark clock should be close to the time it took for the SQL thread to execute the 100,000 update queries. The 100k queries divided by this duration gave the benchmark metric, reported as Queries Per Second (QPS). Test Reset: The test-reset cycle was implemented as follows: · the slave was stopped · the slave data directory replaced with the previous backup · the slave restarted with the slave threads replication pointer repositioned to the point before the update queries in the binlog. The test could then be repeated with identical set of queries but a different number of slave worker threads, enabling a fair comparison. The Test-Reset cycle was repeated 3 times for 0-24 number of workers and the QPS metric calculated and averaged for each worker count. MySQL Configuration The relevant configuration settings used for MySQL are as follows: binlog-format=STATEMENT relay-log-info-repository=TABLE master-info-repository=TABLE As described in the test procedure, the slave_parallel_workers setting was modified as part of the test logic. The consequence of changing this setting is: 0 worker threads:    - current (i.e. single threaded) sequential mode    - 1 x IO thread and 1 x SQL thread    - SQL thread both reads and executes the events 1 worker thread:    - sequential mode    - 1 x IO thread, 1 x Coordinator SQL thread and 1 x Worker thread    - coordinator reads the event and hands it to the worker who executes 2+ worker threads:    - parallel execution    - 1 x IO thread, 1 x Coordinator SQL thread and 2+ Worker threads    - coordinator reads events and hands them to the workers who execute them Results Figure 1 below shows that Multi-Threaded Slaves deliver ~5x higher replication performance when configured with 10 worker threads, with the load evenly distributed across our 10 x schemas. This result is compared to the current replication implementation which is based on a single SQL thread only (i.e. zero worker threads). Figure 1: 5x Higher Performance with Multi-Threaded Slaves The following figure shows more detailed results, with QPS sampled and reported as the worker threads are incremented. The raw numbers behind this graph are reported in the Appendix section of this post. Figure 2: Detailed Results As the results above show, the configuration does not scale noticably from 5 to 9 worker threads. When configured with 10 worker threads however, scalability increases significantly. The conclusion therefore is that it is desirable to configure the same number of worker threads as schemas. Other conclusions from the results: · Running with 1 worker compared to zero workers just introduces overhead without the benefit of parallel execution. · As expected, having more workers than schemas adds no visible benefit. Aside from what is shown in the results above, testing also demonstrated that the following settings had a very positive effect on slave performance: relay-log-info-repository=TABLE master-info-repository=TABLE For 5+ workers, it was up to 2.3 times as fast to run with TABLE compared to FILE. Conclusion As the results demonstrate, Multi-Threaded Slaves deliver significant performance increases to MySQL replication when handling multiple schemas. This, and the other replication enhancements introduced in MySQL 5.6 are fully available for you to download and evaluate now from the MySQL Developer site (select Development Release tab). You can learn more about MySQL 5.6 from the documentation  Please don’t hesitate to comment on this or other replication blogs with feedback and questions. Appendix – Detailed Results

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  • Can I mix compile time string comparison with MPL templates?

    - by Negative Zero
    I got this compile time string comparison from another thread using constexpr and C++11 (http://stackoverflow.com/questions/5721813/compile-time-assert-for-string-equality). It works with constant strings like "OK" constexpr bool isequal(char const *one, char const *two) { return (*one && *two) ? (*one == *two && isequal(one + 1, two + 1)) : (!*one && !*two); } I am trying to use it in the following context: static_assert(isequal(boost::mpl::c_str<boost::mpl::string<'ak'>>::value, "ak"), "should not fail"); But it gives me an compilation error of static_assert expression is not an constant integral expression. Can I do this?

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