Comparison of the results of the performance and the sum of the sum of array elements

I did a comparison of the performance of "Add table" with 2 other methods (an Add elements and function of ddot BLAS) to see who was the fastest and also to compare their results, given that I was watching a few slight differences.

Conclusions
BLAS ddot's quicker (just a little), then add items, then add it in a loop of table

BLAS ddot and add items table give identical results almost all the time.

I don't know why add items in a loop manually gives a slightly different result. I understand there are any rounding due to finite precision errors, but why is it different for the 2 other methods?

Advertisement

This classic of digital computing: the quality of the result depends on the order of operations.

A simple example is the calculation of a * b / c with a, b, c equal to 25, 200 and 100 respectively. The result should be 50, but if a, b and c are U8, the result depends on the order of operation, as shown in the example below. DBL and data non-entier, the difference is of course that much smaller, but still there are!

In your case, the difference also stems from the order of operations:

-in the table add-in, the product of all the elements is calculated first and then the elements of the array are added.

-in the loop, the addition is performed after each multiplication.

Tags: NI Software

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    I wonder how close the 1z1-064 will be the exam 1z0-054.

    I'm also a student at the exam 1z1-064.

    Is he still released books, or simply the material of the RTO.

    Thank you Roger

    Oh - and regarding the materials on 1Z0 - 064, there is not yet any material of third parties specific to 1Z0 -054 out right now.  I am sure that there is no output for 064 yet.  I will create a guide for it shortly... I hope that I will be able to complete before the beta and take the exam at the end of the beta.  However, I concentrate on my exams to practice at the moment... so I don't even know if I'll make this deadline.  I certainly will not post before the end of the beta review and probably not until the review of the production is released.

  • Get an error message that says: we have detected an incompatible driver.  To get a better reading performance and faster, update your display driver.  View the details of the driver: ATI technologies Inc. - AMD Radeon HD 7640 G 3.0.11774 Compadtibilty Pro

    When I start the first items 11, I get an error message that says: we have detected an incompatible driver.  To get a better reading performance and faster, update your display driver.  View the details of the driver: ATI technologies Inc. - AMD Radeon HD 7640 G 3.0.11774 compatibility profile context.  My computer crashes when I click OK.

    It should be in the same place. But do not set your Folder Options to show all files, or you won't see it!

  • Big client - vCenter 5.5 response time of the customer Web U1c / questions of Performance and Navigation

    So we're all aware of the issues with vCenter 5.5U1 WebClient and how we are forced to use it to make use of all the features of the v10, vDS 5.5 vHardware (config switch changes the synchronization problems if an emergency change is done on c# client vDS) VSAN only available via the web client, flash, sluggish to questions do not respond the questions and the list goes with the presentation of the menus and hard to navigate, issues SSO (always after 5.5 upgrades)

    So @ VMware vCenter Architecture Team is going to make an effort to hear and give due to the much needed performance improvements and improvements to the user interface before adding more features and SSO type services which majority of clients don't use not and not force it's customers continue to loose faith its vCenter product?

    Looking for answers with options to remove vCenter 5.5 U1c installation as well as a promise to answer to these in vCenter 6.0 version!

    Here is your answer. First of all, to use Chrome as your browser, then you need to go with at least 4vCPU * 32 GB of RAM & adjust the segment size of java for SSO, Tomcat, (TC) Management Server, inventory server and profile based storage to "refine" vCenter device with DB Oracle embedded or external memory. I did, and performance gains went 10 X. This includes the vSAN enabled running clusters. My recommendation that works very well based on design documents:

    vCenter Server inventory

    VMware VirtualCenter Management Webservices (tc Server)

    The inventory service

    (Sps) profile-based storage service

    Large (more than 400 guests or 4000 VMS) stock

    4 GB

    12 GB

    4 GB

    Setting on the vCenter server 5.5 of the memory unit

    • Connect the unit to vCenter server using SSH
    • VI /usr/lib/vmware-vsphere-client/server/wrapper/conf/wrapper.conf configuration file, locate the JVM memory section and change maxmemory to 4096
    Line 66 # Memory #wrapper.java.initmemory = 512wrapper.java.maxmemory = 4096 JVM
    • /usr/lib/vmware-vpx/inventoryservice/wrapper/conf/wrapper.conf VI configuration file, find the setting. MaxMemory and replace it with 12288
    Line 116 # Size (in MB) maximum Java heap wrapper.java.maxmemory = 12288
    • VI /usr/lib/vmware-vpx/sps/wrapper/conf/wrapper.conf find the setting. MaxMemory and change from 1024 to 4096
    On line 154 # Size (in MB) maximum Java heap wrapper.java.maxmemory = 4096
    • Restart the vCenter device w / DB (1000 hosts) external /embedded for lab (100 guests)

    http://KB.VMware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=2005086&sliceId=1&docTypeID=DT_KB_1_1&dialogID=294472825&StateID=1%200%20294492358

    Documentation Centre of vSphere 5.5

    PS: vCenter 6.0 has much better performance based on my beta test... so don't lose hope yet. Many improvements to come...

    PS: I've also broken down on this here until I figured this out just recently: Re: big client - vCenter 5.5 response time of the customer Web U1c / questions of Performance and Navigation

  • The difference b/w maximum performance and maximum availability

    Hello

    What is the basic difference b/w maximum performance and maximum availability.
    If maximum performance scenarios is used and ensures db stops, changes in the primary db will apply to the next time you start backup db.

    Thanx

    Hello

    I have read all answer your thread.

    If you create a broker - managed DataGuard configuration, you can use
    quick start failover (FSFO) for your dataguard.
    When your primary is down, your sleep will change primary role.

    Concerning
    Mr. Mahir Quluzade

  • Comparison of the two bays and change alpha to the array element?

    Hello

    I continue to work on improving my code ("do more with less"), but ran into a problem.

    I try to have some cases become visible when the mouse over other forums (as if the 'campScene.goToAxSign' becomes visible once the mouse is on "campScene.goToAx"). I have two tables; "hoverDetectArray" handles instances "goToX"and "hoverInfoArray" handles instances "goToXSign.

    hoverDetectArray = [campScene.goToAx, campScene.goToBridge, campScene.cantGo];

    hoverInfoArray = [campScene.goToAxSign, campScene.goToBridgeSign, campScene.cantGoSign];

    The event listener constantly listening for any changes.

    addEventListener (Event.ENTER_FRAME, SceneHoverInfo);

    I have also two functions (although if there is a way to do this with one, please let me know), "SceneHoverInfo" and "SceneHoverInfo2". I am able to do "SceneHoverInfo" works correctly (at least drawing, not my final goal) if I add an event listener for the second function.

    public void SceneHoverInfo(event:Event) {}

    for (var i: uint = 0; i < hoverDetectArray.length; i ++) {}

    If (hoverDetectArray [i] .hitTestPoint (mouseX, mouseY, true)) {}

    trace ("cheese");

    } else {}

    null;

    }

    }

    }

    However, I get the error 'term is undefined' if I write this:

    If the mouse is hovering

    public void SceneHoverInfo(event:Event) {}

    for (var i: uint = 0; i < hoverDetectArray.length; i ++) {}

    If (hoverDetectArray [i] .hitTestPoint (mouseX, mouseY, true)) {}

    addEventListener (Event.ENTER_FRAME, SceneHoverInfoAlso);

    } else {}

    removeEventListener (Event.ENTER_FRAME, SceneHoverInfoAlso);

    }

    }

    }

    sign to view

    public void SceneHoverInfoAlso(event:Event) {}

    for (var e:uint = 0; e < hoverInfoArray.length; e ++) {}

    .Alpha hoverInfoArray [e] = 1;

    }

    }

    I don't know there is something I'm missing, as for the comparison of the two tables. I was hoping somehow the installation program, ' if the mouse is positioned on stationary pointDetectArray [0], castInfoArray [0] to be visible.»

    Help is appreciated, as always, and let me know if you need more information.

    Geez, sorry, my bad. It was a problem of naming error that I do not. However, I must point out that functions still do not work the way I want. I am only able to do the alpha = 0 if I hover over the first element of hoverDetectArray [i] (although a trace works on all levels to detect three); others don't seem to be listening. I will continue to work on that.

    Ned Murphy wrote:

    What is the full error message?  Make sure you go in your publication of PFlash settings and select the option to enable debugging so that your error message provides more complete information when possible.

    EDIT: Welp, IT solved. The key was simply re-use i like the whole (since both "line up" quite a bit) and not worry a statement 'for' for hoverInfoArray.

    public void SceneHoverInfo(event:Event) {}

    for (var i: uint = 0; i

    If (hoverDetectArray [i] .hitTestPoint (mouseX, mouseY, true)) {}

    hoverInfoArray [i] .alpha = 1;

    } else {}

    hoverInfoArray [i] .alpha = 0;

    }

    }

    }

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