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• Week 2, Day 6 of SCO v. Novell Trial - The Mistrial Motion, Updated

  <b>Groklaw:</b> "The judge said what SCO told the jury was inappropriate, and he merely warned SCO not to go "close to the line again." I'm sure SCO will mend its ways immediately."

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• Why does my MacBook Pro trackpad sometimes set its tracking speed to slow, all by itself?

  - by Paul D. Waite

  Every now and then, the trackpad on my MacBook Pro will seem to set its own tracking speed to slow. I’ll notice that the cursor is moving slowly, and when I check in System Preferences, the tracking speed is indeed at slow, even though I never set it to slow myself. This might happen before/after switching into a VMWare virtual machine, but I’m not sure. It doesn’t seem to happen on startup or anything, just during use. Anyone else seen this?

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• How can artificially create a slow query in mysql?

  - by Gray Race

  I'm giving a hands on presentation in a couple weeks. Part of this demo is for basic mysql trouble shooting including use of the slow query log. I've generated a database and installed our app but its a clean database and therefore difficult to generate enough problems. I've tried the following to get queries in the slow query log: Set slow query time to 1 second. Deleted multiple indexes. Stressed the system: stress --cpu 100 --io 100 --vm 2 --vm-bytes 128M --timeout 1m Scripted some basic webpage calls using wget. None of this has generated slow queries. Is there another way of artificially stressing the database to generate problems? I don't have enough skills to write a complex Jmeter or other load generator. I'm hoping perhaps for something built into mysql or another linux trick beyond stress.

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• why is LZMA SDK (7-zip) so slow

  - by Tono Nam

  I found 7-zip great and I will like to use it on .net applications. I have a 10MB file (a.001) and it takes: 2 seconds to encode. Now it will be nice if I could do the same thing on c#. I have downloaded http://www.7-zip.org/sdk.html LZMA SDK c# source code. I basically copied the CS directory into a console application in visual studio: Then I compiled and eveything compiled smoothly. So on the output directory I placed the file a.001 which is 10MB of size. On the main method that came on the source code I placed: [STAThread] static int Main(string[] args) { // e stands for encode args = "e a.001 output.7z".Split(' '); // added this line for debug try { return Main2(args); } catch (Exception e) { Console.WriteLine("{0} Caught exception #1.", e); // throw e; return 1; } } when I execute the console application the application works great and I get the output a.7z on the working directory. The problem is that it takes so long. It takes about 15 seconds to execute! I have also tried http://stackoverflow.com/a/8775927/637142 approach and it also takes very long. Why is it 10 times slower than the actual program ? Also Even if I set to use only one thread: It still takes much less time (3 seconds vs 15): (Edit) Another Possibility Could it be because C# is slower than assembly or C ? I notice that the algorithm does a lot of heavy operations. For example compare these two blocks of code. They both do the same thing: C void main() { time_t now; int i,j,k,x; long counter ; counter = 0; now = time(NULL); /* LOOP */ for(x=0; x<10; x++) { counter = -1234567890 + x+2; for (j = 0; j < 10000; j++) for(i = 0; i< 1000; i++) for(k =0; k<1000; k++) { if(counter > 10000) counter = counter - 9999; else counter= counter +1; } printf (" %d \n", time(NULL) - now); // display elapsed time } printf("counter = %d\n\n",counter); // display result of counter printf ("Elapsed time = %d seconds ", time(NULL) - now); gets("Wait"); } output c# static void Main(string[] args) { DateTime now; int i, j, k, x; long counter; counter = 0; now = DateTime.Now; /* LOOP */ for (x = 0; x < 10; x++) { counter = -1234567890 + x + 2; for (j = 0; j < 10000; j++) for (i = 0; i < 1000; i++) for (k = 0; k < 1000; k++) { if (counter > 10000) counter = counter - 9999; else counter = counter + 1; } Console.WriteLine((DateTime.Now - now).Seconds.ToString()); } Console.Write("counter = {0} \n", counter.ToString()); Console.Write("Elapsed time = {0} seconds", DateTime.Now - now); Console.Read(); } Output Note how much slower was c#. Both programs where run from outside visual studio on release mode. Maybe that is the reason why it takes so much longer in .net than on c++. Conclusion I cannot seem to know what is causing the problem. I guess I will use 7z.dll and invoke the necessary methods from c#. A library that does that is at: http://sevenzipsharp.codeplex.com/ and that way I am using the same library that 7zip is using as: // dont forget to add reference to SevenZipSharp located on the link I provided static void Main(string[] args) { // load the dll SevenZip.SevenZipCompressor.SetLibraryPath(@"C:\Program Files (x86)\7-Zip\7z.dll"); SevenZip.SevenZipCompressor compress = new SevenZip.SevenZipCompressor(); compress.CompressDirectory("MyFolderToArchive", "output.7z"); }

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• Visual studio 2010 remote debugging is very slow (across domains, over vpn)

  - by alex

  Overall debugging works, but each step through code takes dosens of seconds. I've already closed all additional windows like stack trace,watches,autos; deleted all breakpoints. server and dev machine are located in different domains, so i set up local user on both, with matching password. remote debugger is running as service. looking at security log, I found quite a lot of entries about remote debugging account logging in (record about every minute). Any suggestions on how i can speed up remote debugging? dev computer: quad core, 8 Gb mem, win 7 x64 , visual studio 2010 ultimate target server: asp.net website , 2xdual core xeon, 2Gb mem, remote debugger 2010 communication channel: vpn , 5 mbit , latency about 20ms. (seems that debbugging never uses more than 20 kb/s)

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• TeamCity Perforce checkout is ridiculously slow

  - by Ed Woodcock

  Hi folks: Using TeamCity with Perforce on the build server I'm setting up at work: It takes about 2 hours to check out the workspace each time I try to build. Does anyone have any idea WHY this would be the case, when it takes about two minutes to check out the full workspace from within P4V? Cheers, Ed

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• UIWebView loading slow if using baseUrl

  - by ashish

  this works very well and fast but it does not load images if I give baseurl instead of nil. It takes few seconds to load. NSURL *myUrl = [[NSURL alloc] initFileURLWithPath:self.contentPath]; //NSLog(@”Content url is %@”,myUrl); NSString *string = [[NSString alloc]initWithContentsOfFile:self.contentPath encoding:NSASCIIStringEncoding error:nil]; [contentDisplay loadHTMLString:string baseURL:nil]; //here nil if replaced by myUrl webView takes time to load. Any help ? [string release]; [myUrl release];

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• Slow Update/insert into SQL Server CE using LinqToDatasets

  - by Vaccano

  I have a mobile app that is using LinqToDatasets to update/insert into a SQL Server CE 3.5 File. My Code looks like this: // All the MyClass Updates MyTableAdapter myTableAdapter = new MyTableAdapter(); foreach (MyClassToInsert myClass in updates.MyClassChanges) { // Update the row if it is already there int result = myTableAdapter.Update(myClass.FirstColumn, myClass.SecondColumn, myClass.FirstColumn); // If the row was not there then insert it. if (result == 0) { myTableAdapter.Insert(myClass.FirstColumn, myClass.SecondColumn); } } This code is used to keep the hand held database in sync with the server database. Problem is if it is a full update (first time for example) there are a lot of updates (about 125). That makes this code (and more loops like it take a very long time (I have three such loops that take over 30 seconds each). Is there a faster or better way to do updates/inserts like this? (I did see this Codeplex Project, but I could not see how to make it work with both updates and inserts.)

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• Weblogic is slow to start (11mins) under VM (VirtualBox and VMware)

  - by Vladimir Dyuzhev

  (SOLVED! BY FAKING SYSTEM RANDOM GENERATOR, SEE BELOW) I'm setting up a VM image for my dev/build team. Inside that VM a Weblogic domain should be running. I use Ububtu server distro, WLS 9.2MP3 + ALSB. Everything works OK, quite fast, but at the start time the WLS stops twice for a measurable amounts of time. Two stops in total amount to about 10 minutes delay. For tasks where deployment requires server restart it's very annoying. :-( Sleeping time is not constant, sometimes the server starts very fast, sometimes so-so, sometimes 10 minutes or more. Interesting that if I press Enter while looking at the stopped server, it wakes up much faster, sometimes after a few seconds. WLST (Weblogic Jython shell) is also hanging for quite a time when executed in VM. It doesn't react to Enter though. Here must be some developers who run WLS with a VM. I wonder if others have the same problem? Was someone able to solve it? Here's the server output (just for a case): Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04) Java HotSpot(TM) Client VM (build 1.5.0_12-b04, mixed mode) Starting WLS with line: /shared2/beahome/jdk150_12/bin/java -client -Xmx256m -XX:MaxPermSize=128m -Xverify:none -da -Dplatform.home=/shared2/beahome/weblogic92 -Dwls.home=/shared2/beahome/weblogic92/server -Dwli.home=/shared2/beahome/weblogic92/integration -Dweblogic.management.discover=true -Dwl w.iterativeDev= -Dwlw.testConsole= -Dwlw.logErrorsToConsole= -Dweblogic.ext.dirs=/shared2/beahome/patch_weblogic923/profiles/default/sysext_ manifest_classpath -Dweblogic.management.username=admin -Dweblogic.management.password=wlsadmin -Dweblogic.Name=LOGMGR-admin -Djava.security .policy=/shared2/beahome/weblogic92/server/lib/weblogic.policy weblogic.Server <1-Apr-2010 12:47:22 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000395> <Following extensions directory contents added to the end of the classpath: /shared2/beahome/weblogic92/platform/lib/p13n/p13n-schemas.jar:/shared2/beahome/weblogic92/platform/lib/p13n/p13n_common.jar:/shared2/beahom e/weblogic92/platform/lib/p13n/p13n_system.jar:/shared2/beahome/weblogic92/platform/lib/wlp/netuix_common.jar:/shared2/beahome/weblogic92/pl atform/lib/wlp/netuix_schemas.jar:/shared2/beahome/weblogic92/platform/lib/wlp/netuix_system.jar:/shared2/beahome/weblogic92/platform/lib/wl p/wsrp-common.jar> <1-Apr-2010 12:47:22 o'clock PM GMT-05:00> <Info> <WebLogicServer> <BEA-000377> <Starting WebLogic Server with Java HotSpot(TM) Client VM Ve rsion 1.5.0_12-b04 from Sun Microsystems Inc.> <1-Apr-2010 12:47:23 o'clock PM GMT-05:00> <Info> <Management> <BEA-141107> <Version: WebLogic Server 9.2 MP3 Mon Mar 10 08:28:41 EDT 2008 1096261 > <1-Apr-2010 12:47:25 o'clock PM GMT-05:00> <Info> <WebLogicServer> <BEA-000215> <Loaded License : /shared2/beahome/license.bea> <1-Apr-2010 12:47:25 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING> <1-Apr-2010 12:47:25 o'clock PM GMT-05:00> <Info> <WorkManager> <BEA-002900> <Initializing self-tuning thread pool> <1-Apr-2010 12:47:25 o'clock PM GMT-05:00> <Notice> <Log Management> <BEA-170019> <The server log file /shared2/wldomains/beaadmd/LOGMGR/ser vers/LOGMGR-admin/logs/LOGMGR-admin.log is opened. All server side log events will be written to this file.> Here we have the first delay, up to 5 mins... <1-Apr-2010 12:53:21 o'clock PM GMT-05:00> <Notice> <Security> <BEA-090082> <Security initializing using security realm myrealm.> <1-Apr-2010 12:53:24 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STANDBY> <1-Apr-2010 12:53:24 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING> <1-Apr-2010 12:53:25 o'clock PM GMT-05:00> <Notice> <Log Management> <BEA-170027> <The server initialized the domain log broadcaster success fully. Log messages will now be broadcasted to the domain log.> <1-Apr-2010 12:53:25 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to ADMIN> <1-Apr-2010 12:53:25 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to RESUMING> <1-Apr-2010 12:53:28 o'clock PM GMT-05:00> <Notice> <Security> <BEA-090171> <Loading the identity certificate and private key stored under t he alias adminuialias from the jks keystore file /shared2/wldomains/beaadmd/LOGMGR/CustomIdentity.jks.> And here is the second, again up to 5 mins. <1-Apr-2010 12:58:56 o'clock PM GMT-05:00> <Notice> <Security> <BEA-090169> <Loading trusted certificates from the jks keystore file /shared 2/wldomains/beaadmd/LOGMGR/CustomTrust.jks.> <1-Apr-2010 12:58:57 o'clock PM GMT-05:00> <Notice> <Server> <BEA-002613> <Channel "DefaultSecure" is now listening on 192.168.56.102:7002 f or protocols iiops, t3s, ldaps, https.> <1-Apr-2010 12:58:57 o'clock PM GMT-05:00> <Notice> <Server> <BEA-002613> <Channel "Default" is now listening on 192.168.56.102:8012 for pro tocols iiop, t3, ldap, http.> <1-Apr-2010 12:58:57 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000331> <Started WebLogic Admin Server "LOGMGR-admin" for domain " LOGMGR" running in Development Mode> <1-Apr-2010 12:58:57 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to RUNNING> <1-Apr-2010 12:58:57 o'clock PM GMT-05:00> <Notice> <WebLogicServer> <BEA-000360> <Server started in RUNNING mode> UPDATE I think I've got the track: it must be the randon seed initialization. That may explain why generating keyboard events release the server. I've made the thread dump, and one thread is in runnable state, but waiting: "[STANDBY] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'" daemon prio=1 tid=0x0a7b06e8 nid=0xeda runnable [0x728a500 0..0x728a6d80] at java.io.FileInputStream.readBytes(Native Method) at java.io.FileInputStream.read(FileInputStream.java:194) at sun.security.provider.NativePRNG$RandomIO.readFully(NativePRNG.java:185) at sun.security.provider.NativePRNG$RandomIO.implGenerateSeed(NativePRNG.java:202) - locked <0x7d928c78> (a java.lang.Object) at sun.security.provider.NativePRNG$RandomIO.access$300(NativePRNG.java:108) at sun.security.provider.NativePRNG.engineGenerateSeed(NativePRNG.java:102) at java.security.SecureRandom.generateSeed(SecureRandom.java:475) at weblogic.security.AbstractRandomData.ensureInittedAndSeeded(AbstractRandomData.java:83) SOLVED Weblogic uses SecureRandom to init security subsystem. SecureRandom by default uses /dev/urandom file. For some reason, reading this file under VM comes to halt quite often. Generating console events helps to create more randomness, and release the WLS. For the test purposes I have changed jre/lib/security/java.security file, property to securerandom.source=file:/tmp/big.random.file. Weblogic now starts in 15 seconds.

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• Slow XML-RPC in Windows 7 with XML-RPC.NET

  - by Emre Sahin

  I'm considering to use XML-RPC.NET to communicate with a Linux XML-RPC server written in Python. I have tried a sample application (MathApp) from Cook Computing's XML-RPC.NET but it took 30 seconds for the app to add two numbers within the same LAN with server. I have also tried to run a simple client written in Python on Windows 7 to call the same server and it responded in 5 seconds. The machine has 4 GB of RAM with comparable processing power so this is not an issue. Then I tried to call the server from a Windows XP system with Java and PHP. Both responses were pretty fast, almost instantly. The server was responding quickly on localhost too, so I don't think the latency arise from server. My googling returned me some problems regarding Windows' use of IPv6 but our call to server does include IPv4 address (not hostname) in the same subnet. Anyways I turned off IPv6 but nothing changed. Are there any more ways to check for possible causes of latency?

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• eclipse tomcat debug mode slow - pegs cpu

  - by andersonbd1

  Running Tomcat through eclipse works fine in non-debug mode, but not in debug mode. When I try to start the Tomcat server in debug mode, the console output looks fine for a while, but then starts slowing down and eventually just stops, pegging the cpu at 100%. I don't think it's relevant, but just in case - here's the console output right about when it starts slowing down and eventually stopping (by stopping I mean no more console output, but still 100% cpu). 2009-09-02 14:35:30,859 INFO NONE org.springframework.context.weaving.DefaultContextLoadTimeWeaver:72 - Found Spring's JVM agent for instrumentation 2009-09-02 14:35:49,562 INFO NONE org.springframework.beans.factory.support.DefaultListableBeanFactory:414 - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@ed889d: defining beans [... 2009-09-02 14:37:31,031 INFO NONE org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean:221 - Building JPA container EntityManagerFactory for persistence unit ... I tried everything I could think of to fix it: cleanesd tomcat working directory restarted eclipse restarted Windows refreshed/cleaned all projects I first had this problem last week using eclipse ganymede. I had been running fine in debug-mode for several months prior to this issue. I didn't make any significant changes to our project that would cause this. Eventually, I upgraded to eclipse galileo which solved my problem. Now 2 days later, I'm having the same problem in galileo. Like I said it works fine in non-debug mode. Any help is much appreciated. I should add that other things work in debug mode - for instance junit tests, so it is something specific to tomcat.

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• Why is OracleDataAdapter.Fill() Very Slow?

  - by John Gietzen

  I am using a pretty complex query to retrieve some data out of one of our billing databases. I'm running in to an issue where the query seems to complete fairly quickly when executed with SQL Developer, but does not seem to ever finish when using the OracleDataAdapter.Fill() method. I'm only trying to read about 1000 rows, and the query completes in SQL Developer in about 20 seconds. What could be causing such drastic differences in performance? I have tons of other queries that run quickly using the same function. Here is the code I'm using to execute the query: using Oracle.DataAccess.Client; ... public DataTable ExecuteExternalQuery(string connectionString, string providerName, string queryText) { DbConnection connection = null; DbCommand selectCommand = null; DbDataAdapter adapter = null; switch (providerName) { case "System.Data.OracleClient": case "Oracle.DataAccess.Client": connection = new OracleConnection(connectionString); selectCommand = connection.CreateCommand(); adapter = new OracleDataAdapter((OracleCommand)selectCommand); break; ... } DataTable table = null; try { connection.Open(); selectCommand.CommandText = queryText; selectCommand.CommandTimeout = 300000; selectCommand.CommandType = CommandType.Text; table = new DataTable("result"); table.Locale = CultureInfo.CurrentCulture; adapter.Fill(table); } finally { adapter.Dispose(); if (connection.State != ConnectionState.Closed) { connection.Close(); } } return table; } And here is the general outline of the SQL I'm using: with trouble_calls as ( select work_order_number, account_number, date_entered from work_orders where date_entered >= sysdate - (15 + 31) -- Use the index to limit the number of rows scanned and wo_status not in ('Cancelled') and wo_type = 'Trouble Call' ) select account_number, work_order_number, date_entered from trouble_calls wo where wo.icoms_date >= sysdate - 15 and ( select count(*) from trouble_calls repeat where wo.account_number = repeat.account_number and wo.work_order_number <> repeat.work_order_number and wo.date_entered - repeat.date_entered between 0 and 30 ) >= 1

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• Slow query with unexpected index scan

  - by zerkms

  Hello I have this query: SELECT * FROM sample INNER JOIN test ON sample.sample_number = test.sample_number INNER JOIN result ON test.test_number = result.test_number WHERE sampled_date BETWEEN '2010-03-17 09:00' AND '2010-03-17 12:00' the biggest table here is RESULT, contains 11.1M records. The left 2 tables about 1M. this query works slowly (more than 10 minutes) and returns about 800 records. executing plan shows clustered index scan (over it's PRIMARY KEY (result.result_number, which actually doesn't take part in query)) over all 11M records. RESULT.TEST_NUMBER is a clustered primary key. if I change 2010-03-17 09:00 to 2010-03-17 10:00 - i get about 40 records. it executes for 300ms. and plan shows index seek (over result.test_number index) if i replace * in SELECT clause to result.test_number (covered with index) - then all become fast in first case too. this points to hdd IO issues, but doesn't clarifies changing plan. so, any ideas? UPDATE: sampled_date is in table sample and covered by index. other fields from this query: test.sample_number is covered by index and result.test_number too. UPDATE 2: obviously than sql server in any reasons don't want to use index. i did a small experiment: i remove INNER JOIN with result, select all test.test_number and after that do SELECT * FROM RESULT WHERE TEST_NUMBER IN (...) this, of course, works fast. but i cannot get what is the difference and why query optimizer choose such inappropriate way to select data in 1st case.

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• UISegmentedControl makes UITableView slow/lag?

  - by Zac Altman

  So I have a nicely working UITableView consisting of 3 rows (each including and image, and a varying number of text fields). Now the 4th row has a UISegmentedControl. As soon as I added it, the UITableView lags/jumps/skips. When I take it away again, everything is smooth. How can I add the UISegmentedControl and still have smooth scrolling?

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• Why is WPFToolkit DataGrid so slow when binding?

  - by Schneider

  I have a very simple test application where I have two objects, each with a small collection of items. when I select an object I display its collection in a WPFToolkit DataGrid. The problem is there is a noticeable delay, such that if you press up/down keys to toggle selection between objects you can see it can't keep up. Why is the performance so bad? <Window x:Class="SlowGridBinding.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Controls="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" Title="MainWindow" Height="350" Width="525"> <StackPanel> <ListBox ItemsSource="{Binding Shops}" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True"/> <Controls:DataGrid ItemsSource="{Binding Shops/Vegetables}" AutoGenerateColumns="True"/> </StackPanel> The DataContext is populated with some test classes filled with 50 items of random test data.

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• Slow synch of files form iPad to webserver?

  - by MikeN

  I'm building a recording iPad application that will take some moderately large recordings on the iPad (5-10 minutes of full audio roughly 5-10Megabytes in size.) How can I synch such large files to my web server for use? I want the synching to occur asynchronously in the background. Is there an existing library/utility to synch files in the Megabyte range from an iPhone/iPad to a server in small chunks?

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• SQL Quey slow in .NET application but instantaneous in SQL Server Management Studio

  - by user203882

  Here is the SQL SELECT tal.TrustAccountValue FROM TrustAccountLog AS tal INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID INNER JOIN Users usr ON usr.UserID = ta.UserID WHERE usr.UserID = 70402 AND ta.TrustAccountID = 117249 AND tal.trustaccountlogid = ( SELECT MAX (tal.trustaccountlogid) FROM TrustAccountLog AS tal INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID INNER JOIN Users usr ON usr.UserID = ta.UserID WHERE usr.UserID = 70402 AND ta.TrustAccountID = 117249 AND tal.TrustAccountLogDate < '3/1/2010 12:00:00 AM' ) Basicaly there is a Users table a TrustAccount table and a TrustAccountLog table. Users: Contains users and their details TrustAccount: A User can have multiple TrustAccounts. TrustAccountLog: Contains an audit of all TrustAccount "movements". A TrustAccount is associated with multiple TrustAccountLog entries. Now this query executes in milliseconds inside SQL Server Management Studio, but for some strange reason it takes forever in my C# app and even timesout (120s) sometimes. Here is the code in a nutshell. It gets called multiple times in a loop and the statement gets prepared. cmd.CommandTimeout = Configuration.DBTimeout; cmd.CommandText = "SELECT tal.TrustAccountValue FROM TrustAccountLog AS tal INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID INNER JOIN Users usr ON usr.UserID = ta.UserID WHERE usr.UserID = @UserID1 AND ta.TrustAccountID = @TrustAccountID1 AND tal.trustaccountlogid = (SELECT MAX (tal.trustaccountlogid) FROM TrustAccountLog AS tal INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID INNER JOIN Users usr ON usr.UserID = ta.UserID WHERE usr.UserID = @UserID2 AND ta.TrustAccountID = @TrustAccountID2 AND tal.TrustAccountLogDate < @TrustAccountLogDate2 ))"; cmd.Parameters.Add("@TrustAccountID1", SqlDbType.Int).Value = trustAccountId; cmd.Parameters.Add("@UserID1", SqlDbType.Int).Value = userId; cmd.Parameters.Add("@TrustAccountID2", SqlDbType.Int).Value = trustAccountId; cmd.Parameters.Add("@UserID2", SqlDbType.Int).Value = userId; cmd.Parameters.Add("@TrustAccountLogDate2", SqlDbType.DateTime).Value =TrustAccountLogDate; // And then... reader = cmd.ExecuteReader(); if (reader.Read()) { double value = (double)reader.GetValue(0); if (System.Double.IsNaN(value)) return 0; else return value; } else return 0;

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• SQL Server slow in production environment

  - by Lieven Cardoen

  I have a weird problem in a customer's production environment. I can't give any details on the infrastructure, except that SQL server runs on a virtual server. The data, log and filestream file are on another storage server (data and filestream together and log on a separate server). In our local Test environment, there's one particular query that executes with these durations: first we clear the cache 300ms (First time it takes longer, but from then on it's cached.) 20ms 15ms 17ms In the customer's production environment, the SQL Server is more powerful, these are the durations (I didn't have the rights to clear the cache. Will try this tomorrow). 2500ms 2600ms 2400ms The servers in the customer's production environment are more powerful but they do have virtual servers (we don't). What could be the cause... Not enough memory? Fragmentation? Physical storage? How would you tackle this performance problem? EDIT: Some people have asked me if the data set is equal and it is. I restored their database on our environment. It's true that this was the first thing I looked at. (@Everyone: I added the edit because it will be the first thing that many will think off).

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• Eclipse 3.5 switching tab is very slow

  - by n179911

  I am using eclipse 3.5 (cocoa build) on Macos 10.5 with Java 1.5.0.19. I just have 3 java files opened 1 files ~ 2000 lines the other 2 are ~ 700 lines. But when I switch from 1 file tab to another, eclipse takes a long time (~ 20 seconds) to switch to another tab. I have already change the eclipse.ini to more eclipse.ini -startup ../../../plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar --launcher.library ../../../plugins/org.eclipse.equinox.launcher.cocoa.macosx_1.0.0.v20090519 -product org.eclipse.epp.package.jee.product -showsplash org.eclipse.platform --launcher.XXMaxPermSize 256m -vmargs -Dosgi.requiredJavaVersion=1.5 -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -XX:MaxPermSize=512m -Xms128m -Xmx1024m -Xdock:icon=../Resources/Eclipse.icns -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts Is there any way to make eclipse 3.5 more speedy? Thank you.

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• AnkhSVN Commits Are Very Slow

  - by jakdep

  Recently, I had to move my SVN repositories to a different server, but I am experiencing some performance problems since the move. I am using Visual Studio 2005, AnkhSVN 2.1.7819.411 and TortoiseSVN 1.6.6 on my workstation and VisualSVN Server on the server which runs Windows Server 2008. Whenever I try to commit a file or view the file history in Visual Studio it takes twenty odd seconds. I confirmed that an exception has been made for VisualSVN Server on the server's firewall, but when I disable the server's firewall the performance is back to normal (1-2 seconds for a commit). When I do a commit or check the log on a file in TortoiseSVN the performance is fine as well. To ensure that the problem was not related to the moving of the repositories, I am running these tests against a new repository which was created on the new server. So, I reckon the problem lies with AnkhSVN, but am at a loss as how to diagnose it further. Any help would be greatly appreciated.

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• VS 2010 very slow

  - by kaze

  I have just upgraded to VS 2010, and I have performance problems which I did not have before (in VS 2008). The most annoying thing is that it freezes while I work in the text editor. Sometimes when it freezes I see that it is saving auto recovery information, but not always. Almost anything I do gives an unacceptable long delay, like saving, starting to debug, ending debug session, switching between design and code view, and doing WinForms designing. I have some parts of my home directory on a mapped network drive. I suspect that that might be a part of the problem. Is it possible to configure VS 2010 to use exclusively local disk for its "internal" work perhaps? Any hints would be appreciated! Has anyone else experienced these kinds of problems?

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• Slow performance when utilizing Interop.DSOFile to search files by Custom Document Property

  - by Gradatc

  I am new to the world of VB.NET and have been tasked to put together a little program to search a directory of about 2000 Excel spreadsheets and put together a list to display based on the value of a Custom Document Property within that spreadsheet file. Given that I am far from a computer programmer by education or trade, this has been an adventure. I've gotten it to work, the results are fine. The problem is, it takes well over a minute to run. It is being run over a LAN connection. When I run it locally (using a 'test' directory of about 300 files) it executes in about 4 seconds. I'm not sure even what to expect as a reasonable execution speed, so I thought I would ask here. The code is below, if anyone thinks changes there might be of use in speeding things up. Thank you in advance! Private Sub listByPt() Dim di As New IO.DirectoryInfo(dir_loc) Dim aryFiles As IO.FileInfo() = di.GetFiles("*" & ext_to_check) Dim fi As IO.FileInfo Dim dso As DSOFile.OleDocumentProperties Dim sfilename As String Dim sheetInfo As Object Dim sfileCount As String Dim ifilesDone As Integer Dim errorList As New ArrayList() Dim ErrorFile As Object Dim ErrorMessage As String 'Initialize progress bar values ifilesDone = 0 sfileCount = di.GetFiles("*" & ext_to_check).Length Me.lblHighProgress.Text = sfileCount Me.lblLowProgress.Text = 0 With Me.progressMain .Maximum = di.GetFiles("*" & ext_to_check).Length .Minimum = 0 .Value = 0 End With 'Loop through all files in the search directory For Each fi In aryFiles dso = New DSOFile.OleDocumentProperties sfilename = fi.FullName Try dso.Open(sfilename, True) 'grab the PT Initials off of the logsheet Catch excep As Runtime.InteropServices.COMException errorList.Add(sfilename) End Try Try sheetInfo = dso.CustomProperties("PTNameChecker").Value Catch ex As Runtime.InteropServices.COMException sheetInfo = "NONE" End Try 'Check to see if the initials on the log sheet 'match those we are searching for If sheetInfo = lstInitials.SelectedValue Then Dim logsheet As New LogSheet logsheet.PTInitials = sheetInfo logsheet.FileName = sfilename PTFiles.Add(logsheet) End If 'update progress bar Me.progressMain.Increment(1) ifilesDone = ifilesDone + 1 lblLowProgress.Text = ifilesDone dso.Close() Next lstResults.Items.Clear() 'loop through results in the PTFiles list 'add results to the listbox, removing the path info For Each showsheet As LogSheet In PTFiles lstResults.Items.Add(Path.GetFileNameWithoutExtension(showsheet.FileName)) Next 'build error message to display to user ErrorMessage = "" For Each ErrorFile In errorList ErrorMessage += ErrorFile & vbCrLf Next MsgBox("The following Log Sheets were unable to be checked" _ & vbCrLf & ErrorMessage) PTFiles.Clear() 'empty PTFiles for next use End Sub

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• ::LookupAccountSid API Extremely Slow When Targeting x64 Platform (Windows 7)

  - by Chris

  During our application startup, we are making a call to ::LookupAccountSid(). When I build targeting the x86 architecture, this call is nearly instantaneous. However, when I target x64 (debug or release), the call generally takes over 40s to complete. Since this is occurring during application startup, the result is fairly unpleasant as it will appear to the user that the application is not launching. I am running Windows 7 Professional 64-bit on a Dell Studio XPS 16 (Intel Core i7 Q 720). Our application is a native Windows application written in C++. My compiler options (CCOPTS) and linker options (LINKOPTS) are as follows: CCOPTS = "/nologo /Gz /W3 /EHs /c /DWIN32 /D_MBCS /Ob1 /vmg /vmv /Zi /MD /DNDEBUG /DDV_BUILD_DLL /DIV_BUILD_DLL /DDVASSERT_EXCEPTION /Zc:wchar_t-" LINKOPTS = "/manifest:no /nologo /machine:X64 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /DEBUG /subsystem:windows /DLL" Any help would be greatly appreciated :D

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• Slow Scala assert

  - by Dave

  We've been profiling our code recently and we've come across a few annoying hotspots. They're in the form assert(a == b, a + " is not equal to " + b) Because some of these asserts can be in code called a huge amount of times the string concat starts to add up. assert is defined as: def assert(assumption : Boolean, message : Any) = .... why isn't it defined as: def assert(assumption : Boolean, message : => Any) = .... That way it would evaluate lazily. Given that it's not defined that way is there an inline way of calling assert with a message param that is evaluated lazily? Thanks

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• SqlBulkCopy is slow, doesn't utilize full network speed

  - by Alex

  Hi, for that past couple of weeks I have been creating generic script that is able to copy databases. The goal is to be able to specify any database on some server and copy it to some other location, and it should only copy the specified content. The exact content to be copied over is specified in a configuration file. This script is going to be used on some 10 different databases and run weekly. And in the end we are copying only about 3%-20% of databases which are as large as 500GB. I have been using the SMO assemblies to achieve this. This is my first time working with SMO and it took a while to create generic way to copy the schema objects, filegroups ...etc. (Actually helped find some bad stored procs). Overall I have a working script which is lacking on performance (and at times times out) and was hoping you guys would be able to help. When executing the WriteToServer command to copy large amount of data ( 6GB) it reaches my timeout period of 1hr. Here is the core code for copying table data. The script is written in PowerShell. $query = ("SELECT * FROM $selectedTable " + $global:selectiveTables.Get_Item($selectedTable)).Trim() Write-LogOutput "Copying $selectedTable : '$query'" $cmd = New-Object Data.SqlClient.SqlCommand -argumentList $query, $source $cmd.CommandTimeout = 120; $bulkData = ([Data.SqlClient.SqlBulkCopy]$destination) $bulkData.DestinationTableName = $selectedTable; $bulkData.BulkCopyTimeout = $global:tableCopyDataTimeout # = 3600 $reader = $cmd.ExecuteReader(); $bulkData.WriteToServer($reader); # Takes forever here on large tables The source and target databases are located on different servers so I kept track of the network speed as well. The network utilization never went over 1% which was quite surprising to me. But when I just transfer some large files between the servers, the network utilization spikes up to 10%. I have tried setting the $bulkData.BatchSize to 5000 but nothing really changed. Increasing the BulkCopyTimeout to an even greater amount would only solve the timeout. I really would like to know why the network is not being used fully. Anyone else had this problem? Any suggestions on networking or bulk copy will be appreciated. And please let me know if you need more information. Thanks. UPDATE I have tweaked several options that increase the performance of SqlBulkCopy, such as setting the transaction logging to simple and providing a table lock to SqlBulkCopy instead of the default row lock. Also some tables are better optimized for certain batch sizes. Overall, the duration of the copy was decreased by some 15%. And what we will do is execute the copy of each database simultaneously on different servers. But I am still having a timeout issue when copying one of the databases. When copying one of the larger databases, there is a table for which I consistently get the following exception: System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. It is thrown about 16 after it starts copying the table which is no where near my BulkCopyTimeout. Even though I get the exception that table is fully copied in the end. Also, if I truncate that table and restart my process for that table only, the tables is copied over without any issues. But going through the process of copying that entire database fails always for that one table. I have tried executing the entire process and reseting the connection before copying that faulty table, but it still errored out. My SqlBulkCopy and Reader are closed after each table. Any suggestions as to what else could be causing the script to fail at the point each time?

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