performance of matrix

Similar Questions

• multiplication of matrices

  HI, I would ask how to perform muptiplication matrix 10 x 10 with table (do not use linear algebra)...
  AxB = C (A, B, C all 10 x 10). How can I do this?  Many thanks for any help

  If you remember your secondary algebra, then it should be a very easy process to treat two 2D arrays of (I was going to say 'floats', but they could be integers) numbers as if they were a matrix and simply to perform the operation.  Have loops to auto-index through the two tables and relevant table of the functions (big hint - such that transpose) make it easy to do this in a very compact way.  Of course, if you've ever learned about matrices and how to manipulate them, it will be more complicated...

  Just thinking, you should be able to do it with two nested for loops, a matrix function and two digital functions.  For extra credit, you can add a Boolean test (followed by a Case statement that gives an Error Message If the test fails) to ensure that the two tables have a compatible size.

  Bob Schor

• Performance of Bluetooth problem

  I, two headphones listening separate bluetooth (Jaybird X2s and Airfix Matrix 2) this pair perfectly and work fine with my iPhone 6.

  The problem is that when I connect it to my Mac, performance system - audio and video, jump tanks lag mouse, slow individual tasks, etc.

  However, I see no increase in the pressure load of the CPU or memory in the activity monitor.

  I see no unusual chatter in the Console, only messages I expect:

  06/04/16 7:27:50.077 PM blued [26990]: device connected with the address: 44-5e-xx-xx-xx-xx and classOfDevice 0 x 240404 and handle connection 0x000b

  06/04/16 7:27:50.405 PM blued [26990]: CoreAudio trigger for you to connect to bluetoothaudiod

  06/04/16 7:27:52.000 PM kernel [0]: BTCoex Config setting: enable_2G:1, profile_2g:0, enable_5G:1, profile_5G:0

  That said, there are messages that are apparently independent which occur when a Bluetooth audio device is connected and I'm experiencing performance degradation:

  06/04/16 7:30:44.809 PM AddressBookSourceSync [27024]:-[ABPerson valueForProperty:com.apple.Messages.FontSize] - unknown property. This warning will be displayed only once by unknown property, by session.

  06/04/16 7:30:44.811 PM AddressBookSourceSync [27024]:-[ABPerson valueForProperty:com.apple.Messages.FontColor] - unknown property. This warning will be displayed only once by unknown property, by session.

  06/04/16 7:30:44.812 PM AddressBookSourceSync [27024]:-[ABPerson valueForProperty:com.apple.Messages.BalloonColor] - unknown property. This warning will be displayed only once by unknown property, by session.

  06/04/16 7:30:44.813 PM AddressBookSourceSync [27024]:-[ABPerson valueForProperty:com.apple.Messages.FontFamily] - unknown property. This warning will be displayed only once by unknown property, by session.

  06/04/16 7:30:44.813 PM AddressBookSourceSync [27024]:-[ABPerson valueForProperty:com.apple.Messages.RandomBalloonColor] - unknown property. This warning will be displayed only once by unknown property, by session.

  06/04/16 7:30:44.000 PM kernel [0]: sandbox: com.apple.Addres (27025) deny (1) / private/var/run/mDNSResponder network-outgoing

  06/04/16 com.apple.AddressBook.InternetAccountsBridge [27025 7:30:44.817 PM]: dnssd_clientstub ConnectToServer: connect()-> no of tests: 1

  I contacted the support from Apple via Twitter and they recommended the usual Voodoo PRAM reset, but it was not effective.

  Any ideas?

  Now, I'm sure that this is caused by low battery on bluetooth devices to 99%.

  This is a problem that does not occur on my iPhone (even with a low battery), but the loading devices seems entirely solve the problem. Audio begins to jump and performance degrades again once the battery is less than 40% on the headphones.

  Well well... :-/

• Performance issues with Vista on Satellite L40 - 14N

  I just signed up to your forum, it's really nice, how it works.
  I bought 3 months ago, a satellite L40-14N, with Vista Home Premium pre-installed, but I'm starting to get tired of the delays.
  I also have a problem, always Walker I want to open some windows, such as control panel or my computer and all my icons on the desktop disappear after some time will be displayed again, but not the application open before (Panel configuration or my computer).

  I wanted to ask all of you, what may be the problem, in fact I think to get rid of Vista and install XP, do you think it would be a good idea?
  If so, what kind of xp (sp2, sp3, etc.)? And, what I would have in return when I install xp, as what drivers need me for my laptop works properly again?

  Thank you very much... good day

  Hello

  He knows that the Vista operating system is in need of more resources as a Microsoft OS at the beginning of s.
  I have a Vista on the L30 and I get a really slow performance.
  In addition many services and processes running in the background of the operating system. It also decreases performance.
  But all background processes are needed if you want to use all the features of notebooks such as the FN keys or buttons to Toshiba for example.

  However, I've installed XP on the L30 without any additional driver for the FN keys, control buttons etc and it was amazing to see how fast the laptop can be.

  So generally it s not a bad idea to install XP on the L40.
  But note; If you want to install XP on the L40 you must install the Intel Matrix Storage Manager first. Without this driver SATA XP does not recognize the HARD drive.

  Greetings

• Why the mathscript well below matlab performance?

  Hi all

  I do the signal processing on a signal acquired with an ADC. The flow of information is roughly 10,000 x 1000 int8 Matrix per second. I'm trying to process the data at the same speed. Signal processing is done in a ".m" matlab file. The treatment is much to complicated to be coded in the G code.

  I have two choices:

  1. use matlab nodes

  2. using the Mathscript node.

  I've implemented the solution 1, but loses a lot of time just for the transfer of data between labview and matlab (matrix transfer ~ 10 MB). MATLAB is very quick to do signal processing. A faster version of this solution was to write the matrix in a bin file and pass the name of the file to matlab. It is faster (don't ask me why), but is not fast enough.

  Solution 2 sounds better, because as Mathscript is a native language, it is not necessary for the transfer. Prior to joining Mathscipt, I did the following test: run the same simple code on two solutions: calculate the fft of a matrix of 1024 x 1024 ten times (code attached).

  As a result, Matlab version node is 0. 5s compared to 1.6 s for the Mathscript node version.

  Why is the performance of mathscript so much less than the performance of the matlab node?

  If really Mathscript is much slower than Matlab, so I'm afraid I'll stay with node of matlab. Is there a better way to transfer data through files?

  Thanks in advance for your answers!

  You do not know, I can help you, but I found the same thing.

  I have a few guesses - do you use 64-bit Matlab? If so you may have noticed that MathScript runs under 32-bit LabVIEW.

  The other possibility is that Mathscript runs as a process integrated into LabVIEW, while if you use MatLab you use Simulink to communicate with Matlab in its own thread.

  Third option could simply be that Matlab is a commercial product that is much more optimized.

  Honest answer is that I don't know!

• Matrix inversion complex on FPGA

  Hello

  I implement a simple code on SMU-7966R. I need a function that calculates the inversion of a complex matrix (fixed-point). I was wondering if there is an existing library that provides the service or I must apply myself.

  Please can someone enlighten me?

  Thank you.

  I don't quite know librares for the execution of complex matrix inversion.

  There are two ways I used for the development of own implenetations. Both methods involve the decomposition of the matrix A through rotation matricies.

  (1) the QR decomposition through Givens rotations where is QR. This method breaks down the matrix in a unitary matrix Q and a upper triangular matrix R. The inverse of Q is simply its transposed to Hermetian because it is unitary. The inverse of R can be solved for by back substitution. Multiplying the inverse of Q and R gives the inverse of a.

  (2) use the signular A value decompositon to get two unit matricies u and V and a diagonal matrix S of the signular components. Again, reversing the unitary matricies is simply the transposed to Hermetian. The inverse of the diagonal nmatrix is only taking the reciprocal of the diagonal elements. The SWINE vesicular disease can be performed using an algorithm called the cyclic Jacobi method. This method is slightly more complicated than the QR decomposition since it requires an additional rotation matrix, but it avoids the back problems through substition.

  These two processes are iterative and converge to the exact solution as the number if iterations increases. While math can seem a little daunting at first, there is a lot of literature on these topics including different FPGA implementations. Just google 'FPGA QR Décomposition' or 'Method of FPGA Jacobi'.

• Invert the table to the Add element to the front of the performance of Bay

  Hi all

  I read in a few places that reverse an array to add the element to the front of it will give the best performance since no new allocation of memory is necessary.

  I have 2 questions about this process:

  1. "reverse a table on requires pointers change.»

  Is that mean that a table in Labview is like a linked list? who has pointers that point to the next element.

  So when this inverse process occurs, the head of the linked list will be the last element of the array, and all links in the linked list will require a change.

  

  Step 1: table of moose with one extra space at the end

  Step 2: Matrix inverse

  Step 3: Add a new item at the end of the table opposite

  Step 4: Reverse again.

  2. the exercise of reverse Add then reverse is even worse in fact. Why is this?

  

  

  "Overhead" is the need for new buffer allocations, which indireclly affects runtime but also memory.

  Yes, often the paintings have an additional memory beyond the end of the table to avoid the resizing with each adding an item...

  Your FAQ quotes says nothing about any reversal trick. To do this, the elements of the array need reverse look up, then inserted using the space soft (if it exists!), then the need even to reverse ber alements in place. Seems like a lot of work to do over and over again. Yes, it might be slightly more efficient that have to be allocated to each prefix operation but we do not really know what the compiler does. Maybe if soft is available, it would be to move all the items up and insert the element first, make a new allowance that occasionally necessary. Who knows? I have the greatest respect for Darren, the author of the "source". Perhaps he can clarify what he writes.

  Benchmarking valid what is quite difficult.

  In all cases, you often know the final size, so it can be distributed in one shot and the items replaced with valid data that you will. It's always orders if magnutide more effective than any other solution.  If you need to grow an element of a table at a time, add at the end, never at the begginning.

• Is the old HPAL now analyse multi-hearts and Sparse Matrix Toolkit

  I am trying to find a download for the HPAL used be offered by laboratories OR.  This is supposed to be an addon for LabView now NEITHER and I am looking for the download.

  Appears it in two possible addons that HRT has become; either the Toolbox of advanced treatment, which costs around $1500 or multi-hearts and Toolkit of sparse matrix analysis I think that it's free. No one knows what has become the HPAL?

  Yes, you are right...

  the High Performance analysis library was packed to be called analysis of LabVIEW Multicore and SPARC Matrix:

  http://sine.NI.com/NIPs/CDs/view/p/lang/en/NID/210525

  And it is always free to use.

  I hope this helps.

• T40 USB question "this device can perform faster.

  Hello

  OS: Windows XP sp3.

  The USB is just using USB 1.1 speed and informs "this device can perform faster..." ». I googled for this issue in an hour now without solution. The driver on your page for NT4 system. Where can I find a driver to get the proper speed? Or FAQ post, just something.

  Thanks in advance

  BR

  Christoffer

  In your research, have you been able to find this link? : http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-50838

  Even if the document refers to Windows 2000, this means that you need the latest drivers of Intel chipset for the 845 and 855 chipsets to get USB 2.0 support working.

  The latest Lenovo drivers are available from the matrix of Thinkpad here (which are always old enough):

  http://www-307.IBM.com/PC/support/site.WSS/document.do?lndocid=MIGR-46058

  I had to do something similar (many moons ago) I had on my old T40, but the version of Windows XP is come with the correct drivers, I just need to use Device Manager to update the drivers from the default values of windows to the USB 2.0 version.

  Hope that helps.

  EDIT:

  You can also find information about the troubleshooting of devices USB 2.0 here:

  http://www-307.IBM.com/PC/support/site.WSS/MIGR-4YQHUD.html

  The most useful excerpt of this link is probably:

  Ensure that the USB device is USB 1.1 or 2.0 compatible.
  Connect compatible devices USB 1.1 on a compatible port USB 2.0 will cause an error dialog box to appear. This dialog box details that a device non-haute speed was attached to a port high speed. The device must operate normally, but at a slower speed than if a 2.0 device is connected to the 2.0 port. Most of the USB 1.1 devices will operate normally in the USB 2.0 ports.

  In case, the problem is with your driver (s) machine (s) rather than the hub/port USB driver.

• Solve linear equations - Block tridiagonal matrix

  Hello

  I developed a vi that can be used to solve tridiagonal systems by block of equations by Thomas algorithm. These systems are usually in the finite differences method used to solve equations in partial derivatives.

  For iterations of 1000 times, its time is ~ 500ms. Now, I want to finish the work within 100ms. is possible to improve the performance?

  Thanks, Jong Hyun

  For details of the Thomas algorithm, please see wikipedia Web page, http://en.wikipedia.org/wiki/Thomas_algorithm. Note that it describes how to solve tridiagonal linear equations, but same logic can be applied to block tridiagonal equations.

  * If you use the vi sparse SLE of analysis multi-hearts and Sparse Matrix Toolkit, the elapsed time is 450 ms ~

  LabVIEW basic/full/pro all use Intel MKL library for linear algebra on MS Windows and Linux.  Intel MKL designed to be very fast for large matrices and breaking a problem given out to take advantage of the different levels of cache. Linear algebra calls go through several levels of functions, including size controls, if any, and may allocate memory for the workspace each call, before finally calculate the result.  This overload problem is evident when the matrix is so small (3 x 3).

  I coded matrix-matrix, versions multiply, matrix-vector multiply, and matrix opposite in the case of 3 x 3 explicitly in soil using the structure in place and full indexation (no loops, all scalar operations).  This eliminates the overhead of controls and allows better and placeness.  This brings your reference point down for ~ 70ms on my machine.  Unfortunately this requires significant code changes if you change the block size, but it provides good performance.

  "I think that, if I can save each submatrix conversely in the first round and use several times, then speed will be better."

  I agree.  You should be able to calculate the most sweeping toward the front of the algorithm and simply replace the submatrices changed and still solve before.  This may mean re - organize the variables to have the submatrices updated or modified down to the right of the input matrix.

  -Jim

• Matrix multiplication: line 1 d vector * vector 3-3

  I tried to implement the matrix multiply: vector line 1 d * 3 - on - 3 vector in Labview, such as [1 2 3] * [1-2-1; 3 2 4; 5 7 8].

  But it does not seem easy to do.

  If I use the feature matrix-transfer table table of vector line 1-d matrix, he was always transferred to matrix column 1 d vector.

  In my view, it is also not convenient initialize a 1 d array line too.

  I am new to Labview, someone here could help me?

  Thank you very much!

  Huati wrote:

  "Leave the vector as a simple table 1 d." -whatever that means? Table can multiply?

  Use theAxB.vi mathematics of «...» Linear algebra Palette".»

  For example, the following code performs ' V' x matrix ' and 'matrix vector x. See the online help for more details.

  

• Help: "Intel Matrix Storage Manager for Windows XP" Installation failed

  First of all, has anyone successfully lowered their vista to xp in a machine SL400/SL500?

  I had just followed the "Windows XP clean installation/Downgrade Guide" here:

  http://Forum.NotebookReview.com/showthread.php?t=188992

  and got stuck in step "Install Intel Matrix Storage Manager for Windows XP"

  The 'Intel Matrix Storage Manager for Windows XP"for SL400/SL500 (Note: this driver is different from T/R61) I downloaded the support of lenovo cannot be installed. Every time when I followed the instructions of the official support page to run 2ksetup.exe, he gave me a saying invite "installation failed." I have also tried to run "2ksetup.exe" and "2ksetup.ini", according to the official support for unattended Setup page and nothing was (apparently it doesn't have too).

  PS: this installation is done after that the chipset intel is installed as indicated on page 'guide' from notebookreview.

  I also tried to use the driver for T/R 61, since in the official support page, it seems compatible. The installation can be performed successfully, but when I switch the 'compatibility' to 'AHCI' SATA drive in the bios, I can't start windows (every time it showed a blue screen and restarts automatically). When I went back, everything became normal.

  Someone has any idea how to handle this?

  Clean XP install on my SL400 worked like a breeze. Actually a little felt uncomfortable having a complete set of official XP drivers available, because my previous installation was on a HP with almost no XP support beyond what users were mosaicked together in forums.

  I don't like the idea of changing the setting in the BIOS SATA back and back, then I slipstreamed driver ICH9M AHCI (with SP3) by using the MSFN guide. After that, XP installs without complaining, and it was just a matter of download and to install the drivers using the wire of notebookreview.com as a checklist on what to install and in what order.

  Some information on the Guide from notebookreview:

  • I installed the Intel Matrix Storage Manager normally; didn't need to follow the instructions in the guide. Probably does not need to install at all, but you get the utility so you can check NCQ etc. works.
  • ACPI power management is named ThinkPad Power Management driver in the list of drivers for SL.
  • If integrate you the SP3, you will have already sound driver UAA, so you can skip that.
  • Skip Atmel TPM (Trusted Platform Module). There is no driver for the SL series.

• 6210XS SQL Performance Benchmarking

  Our company has recently acquired some new berries for a new ERP system. I am the senior analyst programmer on the project and I'm a beginner-intermediate level on the SAN storage, virtualization and optimization of the performance of SQL. I need to get the speed and at the head of what to expect from this new equipment and best practices to test and manage. Our current ERP is on HP - UX and Informix battery is alien technology in relation to where we are.

  We have a network services division, which was responsible for managing the side home with ESX and EqualLogic 6500 non - ERP. This team is more known in the general management of this equipment, but less time to devote to this new ERP project so I spend to help everyone to get more confidence in the train and educate me about it. Phew. To obtain meat now.

  Setup: dedicated network 10 GB iSCSI with frames enabled. No set MPIO. Dedicated to storage pools for the 6210xs, 6210 (10 K SAS) and 6510 (7200 K). All about the 10 GB.

  I use a tool called MS SQLIO to test the OPS are / s of the 6210XS. I used one of the focus of test by default example of the doc "using SQLIO.

  brief: 6 minutes test, sequential I / O, 2 queries of suspense, of the size of e/s/o requires 256 bytes and a 15 GB test file. The results were:

  H:\SQLIO>SQLIO - kR-s360-fsequential-o2-b256 - LS - Fparam.txt
  SQLIO v1.5.SG
  using meter system for the timings of the latency, 2343750 counts per second
  file settings used: param.txt
  file h:\testfile.dat with 16 (0-15) son using mask 0 x 0 (0)
  16 son of reading for 360 seconds of file h:\testfile.dat
  using 256 KB sequential IOs
  activation of several i/o per thread with 2 exceptional
  the indicated use size: 15000 MB for the file: h:\testfile.dat
  initialization done
  AGGREGATED DATA:
  flow measurements:
  IOs/sec: 133,93
  MBs/s: 33.48
  latency settings:
  Min_Latency (MS): 61
  Avg_Latency (MS): 238
  Max_Latency (MS): 1269

  I made a new test using different settings and had very different results:

  H:\SQLIO>SQLIO - kW - s10 - frandom-o8-b8 - LS - Fparam.txt
  SQLIO v1.5.SG
  using meter system for the timings of the latency, 2343750 counts per second
  file settings used: param.txt
  file h:\testfile.dat with 8 wires (0-7) using mask 0 x 0 (0)
  8 son writing for 10 seconds in the file h:\testfile.dat
  using random 8 KB IOs
  activation of several i/o per thread with 8 exceptional
  the indicated use size: 102400 MB for the file: h:\testfile.dat
  initialization done
  AGGREGATED DATA:
  flow measurements:
  IOs/s: 24122.61
  MBs/s: 188.45
  latency settings:
  Min_Latency (MS): 0
  Avg_Latency (MS): 2
  Max_Latency (MS): 25

  Novice question - this is obviously not a good result, but I need to figure out why my test is configured incorrectly or why the table struggled to perform under these test conditions. Thank you for taking the time to read and respond.

  Usually performance problems are caused by not having is not the SAN (server, switches, table) set up by best practices and in some cases FW drivers and/or obsolete equipment.

  With ESX generally 99% performance problems are solved with:

  Delayed ACK disabled

  People with disabilities large Offload received

  Ensure using Round Robin of VMware (with e / s through changed to 3), or use the EQL MEM (version the most recent is 1.2) Multipathing

  If you use multiple VMDK (or ROW), in the virtual machine, each should have its own virtual SCSI adapter

  Upgrade to the latest build ESX, switch, and server updates

  Take a look at the links listed here first.  See also the Firmware of Array Release notes.

  Best practices for ESX

  en.Community.Dell.com/.../20434601.aspx

  Configuration Guide for EqualLigic

  en.Community.Dell.com/.../2639.EqualLogic-Configuration-Guide.aspx

  Quick Configuration portal (start Grand Place)

  en.Community.Dell.com/.../3615.Rapid-EqualLogic-configuration-Portal-by-SIS.aspx

  Best practices white papers, look for SQL and ESX

  en.Community.Dell.com/.../2632.Storage-Infrastructure-and-solutions-Team-publications.aspx

  Compatibility matrix

  en.Community.Dell.com/.../20438558

  -Joe

• All x 230 settings of video performance?

  Windows 7 x 64 on x 230 i5 - 3320 M 2.60 GHz upgraded with 8 GB of RAM. The graphics are 4.9 to WEI. Read the other messages I'd expect a little help after upgrade to 4 GB of RAM, but it wasn't the case. I'm curious to know what people are doing there so I don't see that you can adjust the memory allocated to GPS to hit their graphics performance.

  THX.

  My X 220 (graph HD3000) got a major wei graphics bump (6.3 for the two partitions) following a 4--> 8 gb ram upgrade. updated for the latest video driver from the matrix developed two graphic scores upwards by another 0.1.

  When you run wei, make sure you have the value max performance power plan and he is also reported to help if you use a 90w adapter. at least for the i7 X 220.

  out of curiosity, how graphic ram is your statement as machine available?

  Kind regards.

• Reference Dell R520 slow performance hard drive with 6 x 600 GB SAS 15 K

  Hello

  We are verry bad writing performance on our R520 with 2012 R2.

  For example, install a VM of R2 2012 will be faster on my home computer on this server. As we wanted using this server primarily to see that this is starting to be a real problem.

  All hard drives are in a matrix single raid 5. There are a score of 200 GB for the OS (C:\). and a score of 2, 6 TB of data and the virtual machine (D:\).

  Installation program:
  POWEREDGE R520.
  H310 PERC RAID CONTROLLER
  PERFORMANCE BIOS SETTING
  2 x INTEL XEON E5 - 2430 V2 2.50 GHZ
  4 x 16GB RDIMMS, 1600 MHZ
  6 x 600GB, SAS 6GBPS, 3.5-INCH, 15K rpm

  
  

  Thanks in advance and I apologize for my bad English.

  Consider upgrading your controller RAID for a H710. The H310 is a low range controller and your bottleneck.