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  • mysql innodb max size of transaction

    - by chris
    Using mysql 5.1.41 and innodb I'm doing some data import, but can't use load data infile, so I'm manually issuing insert statements. I found that it's much faster to disable auto commit and issue say, 100 insert statements and then commit, instead of the implicit commit after each insert. It got me thinking, what limits are there to how much data I can put into a transaction? Is there a limit on the number of statements, or does it have to do with the size in bytes etc...?

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  • how to implement a "soft barrier" in multithreaded c++

    - by Jason
    I have some multithreaded c++ code with the following structure: do_thread_specific_work(); update_shared_variables(); //checkpoint A do_thread_specific_work_not_modifying_shared_variables(); //checkpoint B do_thread_specific_work_requiring_all_threads_have_updated_shared_variables(); What follows checkpoint B is work that could have started if all threads have reached only checkpoint A, hence my notion of a "soft barrier". Typically multithreading libraries only provide "hard barriers" in which all threads must reach some point before any can continue. Obviously a hard barrier could be used at checkpoint B. Using a soft barrier can lead to better execution time, especially since the work between checkpoints A and B may not be load-balanced between the threads (i.e. 1 slow thread who has reached checkpoint A but not B could be causing all the others to wait at the barrier just before checkpoint B). I've tried using atomics to synchronize things and I know with 100% certainty that is it NOT guaranteed to work. For example using openmp syntax, before the parallel section start with: shared_thread_counter = num_threads; //known at compile time #pragma omp flush Then at checkpoint A: #pragma omp atomic shared_thread_counter--; Then at checkpoint B (using polling): #pragma omp flush while (shared_thread_counter > 0) { usleep(1); //can be removed, but better to limit memory bandwidth #pragma omp flush } I've designed some experiments in which I use an atomic to indicate that some operation before it is finished. The experiment would work with 2 threads most of the time but consistently fail when I have lots of threads (like 20 or 30). I suspect this is because of the caching structure of modern CPUs. Even if one thread updates some other value before doing the atomic decrement, it is not guaranteed to be read by another thread in that order. Consider the case when the other value is a cache miss and the atomic decrement is a cache hit. So back to my question, how to CORRECTLY implement this "soft barrier"? Is there any built-in feature that guarantees such functionality? I'd prefer openmp but I'm familiar with most of the other common multithreading libraries. As a workaround right now, I'm using a hard barrier at checkpoint B and I've restructured my code to make the work between checkpoint A and B automatically load-balancing between the threads (which has been rather difficult at times). Thanks for any advice/insight :)

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  • Page Loading Screen in PHP

    - by Palani
    Hi all, I am working on a Php page which loads more images,so I want to show the User as the Page is currently Loading. I have tried but it does not working correctly. The loading image should be run until all image gets load.How to implement for this?

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  • Does MS Access 2010 have Tif image control display issue?

    - by ChuckB
    We run MS Access as the front end for most of our business. When we upgraded from Access 2000 to Access 2003 the image control we used to print out Tif images failed to load Tifs anymore. A bit of Googling showed that MS did this intentionally and I'm wondering if the problem still happens in Access 2010. Can someone with a downloaded copy drop an image control on an Access 2010 form or report and try to get it to display a Tif file?

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  • Set flashvars of a SWF in Flex before loadComplete

    - by sami
    I have a Flash applet which I want to embed in a Flex file this loads a panorama file inside a SWF player (Immervision's PurePlayer)- I am using the following code: <mx:SWFLoader id="mapLoader" width="740" height="588" source="../bin-debug/PurePlayer.swf?flashvars='panorama=../bin-debug/untitled.ivp'" /> The applet loads fine but it is does not execute the file... The PurePlayer documentation uses the following var: panorama=myPano.ivp" If I load the same SWF via a browser window it works fine with the following URL: http://localhost/pureplayer/PurePlayer.swf?panorama=untitled.ivp

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  • Zend_Paginator - Increase querys

    - by poru
    Hello, I started using Zend_Paginator, it works everything fine but I noticed that there is one more query which slows the load time down. The additional query: SELECT COUNT(1) AS `zend_paginator_row_count` FROM `content` The normal query: SELECT `content`.`id`, `content`.`name` FROM `content` LIMIT 2 PHP: $adapter = new Zend_Paginator_Adapter_DbSelect($table->select()->from($table, array('id', 'name'))); $paginator = new Zend_Paginator($adapter); Could I merge the two querys into one (for better performance)?

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  • How do I use the Windows API Code Pack in VB.net 2010 Express?

    - by Josh
    Hi all, I recently downloaded the Windows API code pack for .net, and seeing there was VB.net examples inside there, I opened them up. Upon building I get a warning that the referenced components 'Core' and 'Shell' could not be found. Looking in the code pack folder I see there are no DLLs at all, but instead a whole load of C# sources. Do I have to download C# Express (which I want to avoid) to use the code pack or are there precompiled DLLs somewhere?

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  • drawing images and lines over UIScrollView

    - by Jorge
    I'm programming an app in which one of the ViewControllers is showing an UIScrollView that shows an image. I'd like to load an image (pushpin in png format) and draw it (and delete it) in some points of the UIScrollView image. I'd also would like to draw bezier paths in that image (and deleting them). I've programmed several apps but this is the first time I face graphic programming and don't know where to start from. Any suggestions? Thanks!

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  • Strange error in SpringMVC Application Startup

    - by Euzel Villanueva
    I'm getting a very strange stack trace when trying to load a SpringMVC application and at a lost to why this is occurring. org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0': Cannot create inner bean '(inner bean)' of type [org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter] while setting bean property 'messageConverters' with key [4]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#6': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter]: Constructor threw exception; nested exception is java.lang.OutOfMemoryError: Java heap space at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:281) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:125) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:353) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:153) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1325) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1086) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:442) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:458) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:339) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:306) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:127) at javax.servlet.GenericServlet.init(GenericServlet.java:160) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1133) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1087) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:996) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4834) at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5155) at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5150) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#6': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter]: Constructor threw exception; nested exception is java.lang.OutOfMemoryError: Java heap space at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:965) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:911) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:270) ... 31 more Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter]: Constructor threw exception; nested exception is java.lang.OutOfMemoryError: Java heap space at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:141) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:74) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:958) ... 35 more

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  • Is it possible to restore a previous GL framebuffer?

    - by Rob
    Hi there, I'm working on an iPhone app that lets the user draw using GL. I used the GLPaint sample code project as a firm foundation, but now I want to add the ability for the user to load one of their previous drawings and continue working on it. I know how to get the framebuffer contents and save it as a UIImage. Is there a way for me to take the UIImage and tell GL to draw that? Any help is much appreciated.

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  • Calling Class from another File ASP.NET VB.NET

    - by davemackey
    Lets say I have a class like this in class1.vb: Public Class my_class Public Sub my_sub() Dim myvar as String myvar = 10 Session("myvar") = myvar End Sub End Class Then I have a ASP.NET page with a code-behind file, default.aspx and default.aspx.vb and I want to call my_class. I'm doing the following, but it doesn't work: Imports my_app.my_class Partial Public Class _default Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender as Object, ByVal e as System.EventArgs) Handles Me.Load my_class() End Sub End Class I get a "Reference to a non-shared member requires an object reference"

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  • loading multiple line query in one row

    - by bharath
    Hi, How to load a multiple line query in one row using mysql.The data is stored in a text file. For example: "GGAGTTGTGGGAGTGGAGGAGGAAGAGGCGGTGGGGAGTACGGGGGCTGGTCCCAGAAGATGGCGGAGGC GGGGGATTTCTGGTAGGTCCTACTTTAGGACAAGATGTGGTGGTACTGTTGAAGCGTCAGTCTTTGATTC" Thanks in advance.

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  • hex value in field/row terminator for bulk insert

    - by TheObserver
    I'm running SQL Server 2005 Express. And I'm trying to do a bulk insert/import of a data file with a field/row terminator that uses a hexadecimal value 0x001. How should I represent it in a bulk insert command? I have something like: bulk insert xxx.dbo.[yyy] from 'D:\zzz\zzz.dat' with ( CODEPAGE='RAW', FIELDTERMINATOR = '=|=', ROWTERMINATOR = '=|=\001\n', KEEPNULLS ); which results in Msg 4863, Level 16, State 1, Line 7 Bulk load data conversion error (truncation) for row 1, column 3 (code).

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  • What is Lazy Loading?

    - by Brian Boatright
    What is Lazy Loading? [Edit after reading a few answers] Why do people use this term so often? Say you just use a ASP/ADO recordset and load it with data or ADO.NET Datasource for a gridview. I guess I should have asked why people use the term Lazy Loading, what "other" types are their?

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  • How to generate custom JSESSIONID, based on some hash of user's data in order to replicate session

    - by Shaman
    Is it possible to override Tomcat's embedded generator of JSESSIONID, to be able to create custom values of this cookie, based on user's login? Why do I need this: I have a load balancer with "sticky sessions", configured to route requests with the same JSESSIONID to the same server, and I want to prevent situation, when same user can start two different sessions on different servers.

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  • remote debug unmanaged code

    - by sagie
    Hi. I have a process that contains C# code, C++\CLI code and native c++ code. Now, I'm trying to remote debug my process, and I can go to the statements of my C# code and my C++\CLI code, but I can't reach my native code. When I try to hit a breakpoint in my native c++ source file, I get the "No symbole have been loaded" error. I tried to manualy load the symboles (tools-options-debugging), but no luck. Any Idea?

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  • Most effective way to draw 4 lines on a screen?

    - by Ross
    basic question, but I'm unsure: I want to draw 4 short lines 1px lines on a view. What is the best way to approach this task? Options:- Load an image of the line, can create 4 UIImageViews with it. Create my own subclass of a UIView that draws a line in the draw rect method. Draw elsewhere on another view, another UIImageView that has an UIImage inside it (is this possible?) Another way? Thanks Ross

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  • How do I determine the .NET framwork version in a partial/medium trust environment?

    - by Ezombort
    I need to determine the clients .NET framework version in my web application. I'm running in partial trust so I can not read the filesystem or registry (Is there an easy way to check .net framework verison using C#?). System.Environment.Version returns the runtime version, so I can not use that. I cannot use javascript The only way I can think of at the moment is to try to load a .NET 3.5 dll and catch an exception, but this does not sound very nice. Any suggestions?

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  • How do I organise my libraries in sub-directories in a web application project

    - by Ravish Bhagdev
    I am working on a huge web-application with hundreds of dependencies (jar files). I want to organise the jars in sensible way as each piece of software comes with its bunch of jar files and when I want to remove or upgrade version of that software it will be easier to do if kept in sub directories. Problem is that when using a web-server (I'm using tomcat), all libs need to be under WEB-INF/lib folder, you cannot create subdirectories otherwise it doesn't load the jars in subdirectories. Thanks.

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  • Flex project architecture ?

    - by Tony
    What's the best way to organize functionality modules in a flex project? I saw some people put all modules in one view stack ,and so the application interface is only load once, but when the application get larger, the whole compiled swf would be very big. If we put swfs in different pages, we pass request parameters through HTTP request, we lost the benefits from flex RPC services, slow loading, and we can't see any superior comparing to php,asp,jsp... what's the best practice to organize front end architecture?

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