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  • Running virtual machines: Linux vs Windows 7

    - by vikp
    Hi, I have tried running windows xp development virtual machine under windows 7 and the performance was dreadful. I'm considering installing Linux and running the virtual machine from the Linux, but I'm not sure whether I can expect any performance gains? It's a 2.4ghz core 2 duo machine with 4gb ram and 5400 rpm hdd. Can somebody please recommend very cut down version of linux that can run VMWare player and isn't resource hungry? Thank you

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  • String literals vs constants for Session[...] dictionary keys

    - by FreshCode
    Session[Constant] vs Session["String Literal"] Performance I'm retrieving user-specific data like ViewData["CartItems"] = Session["CartItems"]; with a string literal for keys on every request. Should I be using constants for this? If yes, how should I go about implementing frequently used string literals and will it significantly affect performance on a high-traffic site? Related question does not address ASP.NET MVC or Session.

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  • Linux memory fragmentation

    - by Raghu
    Hi all, Is there a way to detect memory fragmentation on linux ? This is because on some long running servers I have noticed performance degradation and only after I restart process I see better performance. I noticed it more when using linux huge page support -- are huge pages in linux more prone to fragmentation ? I have looked at /proc/buddyinfo in particular. I want to know whether there are any better ways to look at it.

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  • PBS programming

    - by Werner
    Hi, some short and probably stupid questions about PBS: 1- I submit jobs using qsub job_file is it possible to submit a (sub)job inside a job file? 2- I have the following script: qsub job_a qsub job_b For launching job_b, it would be great to have before the results of job_a finished. Is it possible to put some kind of barrier or some otehr workaround so job_b is not launched until job_a finished? Thanks

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  • Should you use a PHP Framework?

    - by christopher-mccann
    I have asked before about selecting a framework but I have never actually asked should you a framework? In the past I have never used one but I am being drawn more and more to the idea to speed up development time. I am really concerned about the performance of the application though. Does anyone have any views on whether it is a good idea or not to use a framework? The performance of the apps built on top of it will be crucial. Thanks

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  • Quartz Cron Trigger with Spring - triggering new cron before last ended

    - by Trick
    Simple question, I think. I have org.springframework.scheduling.quartz.CronTriggerBean triggering one job once a day. Because this method can last a long time (over 24 hours), will the next day at the same time a new job be executed if the last one is not ended yet? If yes - is it possible to turn off executing new jobs until the last one is finished? My method is trans-coding videos and some days there a lot of videos and could last long.

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  • Do any clouds support SSD storage?

    - by taw
    I'm using Amazon cloud right now, and the biggest performance issue is horrible I/O performance. As long as something fits RAM it's fine - once it's too big it gets ridiculously slow (in many different scenarios). There are only so many ways one can avoid hitting disk - so the question is - does Amazon or some other cloud provide SSD option?

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  • using vb6 for testing

    - by codeModuler
    A friend has got an interview for a testing job. Apparently the job requires knowledge of VB6. My friend knows VB6 and she knows testing, but she and I are both wondering what is the relevance of VB6 to testing. Is there some well-known standard way to test applications using VB6 that my friend should learn for this interview?

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  • Java Deflater strategies - DEFAULT_STRATEGY, FILTERED and HUFFMAN_ONLY

    - by Keyur
    I'm trying to find a balance between performance and degree of compression when gzipping a Java webapp response. In looking at the Deflater class, I can set a level and a strategy. The levels are self explanatory - BEST_SPEED to BEST_COMPRESSION. I'm not sure regarding the strategies - DEFAULT_STRATEGY, FILTERED and HUFFMAN_ONLY I can make some sense from the Javadoc but I was wondering if someone had used a specific strategy in their apps and if you saw any difference in terms of performance / degree of compression. Thanks, Keyur

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  • Basic Ruby On Rails Linking Help

    - by dweebsonduty
    So I am beginning to work with Rails and I get some of the concepts but am stuck on an important one. Let's say I have customers which has many jobs and jobs which belongs to customers. How would I go about creating a new job for a customer? I can create a link that goes to customers/1/jobs/new and I can grab the customer ID but how do I tell it that I am creating a job for customer 1? I know this is the most basic of things but I just need a push in the right direction. This is my form so far: How do I get :customer_id to populate with the customer_id param? <h1>New job</h1> <% form_for(@job) do |f| %> <%= f.error_messages %> <p> <%= f.label :customer_id %><br /> <%= f.text_field :customer_id %> </p> <p> <%= f.label :manufacturer %><br /> <%= f.text_field :manufacturer %> </p> <p> <%= f.label :serial_number %><br /> <%= f.text_field :serial_number %> </p> <p> <%= f.label :problem %><br /> <%= f.text_area :problem %> </p> <p> <%= f.label :notes %><br /> <%= f.text_area :notes %> </p> <p> <%= f.label :status %><br /> <%= f.text_field :status %> </p> <p> <%= f.label :tech_id %><br /> <%= f.text_field :tech_id %> </p> <p> <%= f.submit 'Create' %> </p> <% end %> <%= link_to 'Back', jobs_path %>

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  • Powershell $LastExitCode=0 but $?=False . Redirecting stderr to stdout gives NativeCommandError

    - by Colonel Panic
    Can anyone explain Powershell's surprising behaviour in the second example below? First, a example of sane behaviour: PS C:\> & cmd /c "echo Hello from standard error 1>&2"; echo "`$LastExitCode=$LastExitCode and `$?=$?" Hello from standard error $LastExitCode=0 and $?=True No surprises. I print a message to standard error (using cmd's echo). I inspect the variables $? and $LastExitCode. They equal to True and 0 respectively, as expected. However, if I ask Powershell to redirect standard error to standard output over the first command, I get a NativeCommandError: PS C:\> & cmd /c "echo Hello from standard error 1>&2" 2>&1; echo "`$LastExitCode=$LastExitCode and `$?=$?" cmd.exe : Hello from standard error At line:1 char:4 + cmd <<<< /c "echo Hello from standard error 1>&2" 2>&1; echo "`$LastExitCode=$LastExitCode and `$?=$?" + CategoryInfo : NotSpecified: (Hello from standard error :String) [], RemoteException + FullyQualifiedErrorId : NativeCommandError $LastExitCode=0 and $?=False My first question, why the NativeCommandError ? Secondly, why is $? False when cmd ran successfully and $LastExitCode is 0? Powershell's docs about_Automatic_Variables don't explicitly define $?. I always supposed it is True if and only if $LastExitCode is 0 but my example contradicts that. Here's how I came across this behaviour in the real-world (simplified). It really is FUBAR. I was calling one Powershell script from another. The inner script: cmd /c "echo Hello from standard error 1>&2" if (! $?) { echo "Job failed. Sending email.." exit 1 } # do something else Running this simply .\job.ps1, it works fine, no email is sent. However, I was calling it from another Powershell script, logging to a file .\job.ps1 2>&1 > log.txt. In this case, an email is sent! Here, the act of observing a phenomenon changes its outcome. This feels like quantum physics rather than scripting! [Interestingly: .\job.ps1 2>&1 may or not blow up depending on where you run it]

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  • What does "Computing additional info" mean?

    - by JesperE
    Eclipse Helios periodically starts running a job which displays "Computing additional info". During this time, Eclipse is very sluggish, bordering on unusable. What does this job do? Can I shut it off? I just hope that someone in the JDT team comes to sense and gets rid of it, make it go faster, or at the very least change it to something meaningful.

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  • C# function normal return value VS out or ref argument

    - by misha-r
    Hi People, I've got a method in c# that needs to return a very large array (or any other large data structure for that matter). Is there a performance gain in using a ref or out parameter instead of the standard return value? I.e. is there any performance or other gain in using void function(sometype input, ref largearray) over largearray function(sometype input) ? Thanks in advance!

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  • Parallel.For maintain input list order on output list

    - by romeozor
    I'd like some input on keeping the order of a list during heavy-duty operations that I decided to try to do in a parallel manner to see if it boosts performance. (It did!) I came up with a solution, but since this was my first attempt at anything parallel, I'd need someone to slap my hands if I did something very stupid. There's a query that returns a list of card owners, sorted by name, then by date of birth. This needs to be rendered in a table on a web page (ASP.Net WebForms). The original coder decided he would construct the table cell-by-cell (TableCell), add them to rows (TableRow), then each row to the table. So no GridView, allegedly its performance is bad, but the performance was very poor regardless :). The database query returns in no time, the most time is spent on looping through the results and adding table cells etc. I made the following method to maintain the original order of the list: private TableRow[] ComposeRows(List<CardHolder> queryResult) { int queryElementsCount = queryResult.Count(); // array with the query's size var rowArray = new TableRow[queryElementsCount]; Parallel.For(0, queryElementsCount, i => { var row = new TableRow(); var cell = new TableCell(); // various operations, including simple ones such as: cell.Text = queryResult[i].Name; row.Cells.Add(cell); // here I'm adding the current item to it's original index // to maintain order in the output list rowArray[i] = row; }); return rowArray; } So as you can see, because I'm returning a very different type of data (List<CardHolder> -> TableRow[]), I can't just simply omit the ordering from the original query to do it after the operations. Also, I also thought it would be a good idea to Dispose() the objects at the end of each loop, because the query can return a huge list and letting cell and row objects pile up in the heap could impact performance.(?) How badly did I do? Does anyone have a better solution in case mine is flawed?

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  • SQL Server combining 2 rows into 1 from the same table

    - by Maton
    Hi, I have a table with an JobID (PK), EmployeeID (FK), StartDate, EndDate containing data such as: 1, 10, '01-Jan-2010 08:00:00', '01-Jan-2010 08:30:00' 2, 10, '01-Jan-2010 08:50:00', '01-Jan-2010 09:05:00' 3, 10, '02-Feb-2010 10:00:00', '02-Feb-2010 10:30:00' I want to return a record for each EndDate for a Job and then the same employees StartDate for his next immediate job (by date time). So from the data above the result would be Result 1: 10, 01-Jan-2010 08:30:00, 01-Jan-2010 08:50:00 Result 2: 10, 01-Jan-2010 09:05:00, 02-Feb-2010 10:00:00 Greatly appreciate any help!

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  • IIS failed request log viewer

    - by Cédric Boivin
    Hello, It's there an existing application to visualize IIS 7.0 failed request log ? I know you can use IE to analyse the xml log file, and we get a visual generate by the xsl file, but my xml log file have 97 MO and the IE performance is not got. I cannot view the performance log, because i beleive there a javascript error generated. Thanks

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  • Where are the menu,header,footer loaded in an MVC structures

    - by Saif Bechan
    I am creating an framework in PHP, and i am using and MVC structure. My link look something like this: mydomain.com/controller/action So this link loads a controller, which loads the needed action. Now my page needs a header, footer, and it has a menu which is in the database. Where do i load all these things. Is this the job of the controller, or the job of the model.

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  • Using NSPredicate to segment table by dates in iPhone

    - by pabloruiz55
    I have an array of dictionaries with several jobs. I want to have a table display these jobs sorted by month - year. How could i divide that array so i end up having for example: section: july 2009 and the amount of rows for each job in that date. section: august 2009 and the amount of rows for each job in that date. and so on. Thanks

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  • open source gossip-based membership protocol?

    - by Aaron
    I am looking for a library which I can plug into a distributed application which implements any gossip-based membership protocol. Such a library would allow me to send/receive membership lists, merge received membership lists, etc... Even better would be if the library implemented a protocol with performance O(logn) performance guarantees. Does anyone know of any open source library like this? It doesn't need to meet all of the aforementioned requirements; even something partially implemented would be helpful.

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  • ColdFusion vs PHP

    - by Drek
    Can anyone share with me (without fervent evangelism, please) any comparative experiences you might have with regard to ColdFusion and PHP in developing internal enterprise browser-based applications? Specifically (but not limited to): 1: Do the rapid-development characteristics of ColdFusion compensate for any performance issues resulting from the additional overhead? 2: Is either particularly suited to individual or team development? 3: Is rapidly developing an application in ColdFusion and then porting it to PHP to improve performance a proposition that only a madman or venture capitalist would consider?

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  • Is there a way to configure timeout for speculative execution in Hadoop?

    - by S.O.
    I have hadoop job with tasks that are expected to run for significant length of fime (few minues). However hadoop starts speculative execution too soon. I do not want to turn speculative execution completely off but I want to increase duration of time hadoop waits before considering job for speculative execution. Is there a config option to control this timeout? Thanks

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  • what is best way to store long term data in iphone Core Data or SQLLite?

    - by AmitSri
    Hi all, I am working on i-Phone app targeting 3.1.3 and later SDK. I want to know the best way to store user's long term data on i-phone without losing performance, consistency and security. I know, that i can use Core Data, PList and SQL-Lite for storing user specific data in custom formats.But, want to know which one is good to use without compromising app performance and scalability in near future. Thanks

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