for loop in sendAndLoad results

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• parallel for loops does not

  Hello.

  I'm learning the multi - thread programming. To start, I use "parallel for loops" and I was surprised that it does not work. One - thread loop work a few times faster (depending on settings) that multi - thread. I don't know why, and it is my request to correct my Vi to work properly.

  Lenovo, G580, Windows 7, 64-bit computer

  Intel Core i7 3632QM
  Ivy Bridge
  Specification Intel (r) Core i7-3632QM CPU @ 2.20 GHz
  Package (platform ID) Socket 988 B rPGA (0x4)
  Number of hearts 4
  Number of threads 8

  LabView 2011.

  Altenbach says:
  

  Gibbon wrote:

  What was 'strange' behavior?  In "linia dluga" when inside the loop is on '1' of the "spreed up' between one and multi-fil is about 3 times, when I put it in '20' this grow to 6.2. It was strange form me, becourse I expect a similar value.

  A parallel FOR loop has an overhead for parallelization (split the problem, then go back the results, etc.). If the code is very fast, the overhead is proportionally larger. If the Subvi takes a long time to complete, the overhead of parallelization is insignificant. It is often not worthwhile to parallelize the loops with a very simple and fast code.

  Gibbon wrote:

  Altenbach - I have another question if you can help me - how did you "seconds relative high resolution." VI "? -I want to say how did you know that there is this 'vi '. And thanks a lot for your modyfications.

  You can find it in vi.lib\utilities. It is well known.

  Maybe not well known enough!  the 'Hidden gems' package adds to your palattes.  It has also been considered by a nugget of the community

• For loop within a while loop

  I have for loop within a while loop... admission to the for loop N comes from the VI selection... the while loop I a condition essentially statement it stops just after to finish all the iteration in loop...

  Entrance to the N loop is bascially driven by a local variable... that's the problem Iam having:

  When I press the Start button to run the program... regardless of the output of the select VI is gives the N of the for loop, then the loop starts and then ends in place... and when the output of the select statement takes a different value (the N of the loop for) loop not work until I restart the program again... What can I do so that the for loop runs again for another value of N, the RUN program button is enabled.

  1. clean your diagram.  Style guides suggest keep the pattern of a single screen.  With a little effort, I was able to get your DB less than 1600 x 1000 pixels.

  2 then I can see (some) it happens all at once. This thing does nothing?

  3. local variables can lead to race conditions.  Output in Angle position may be a race condition, although is probably not what you wanted to do.  What does the wired local time at the moment present terminal meter? (Ooops! Two controls with the same name - which can be quite confusing as well!)  If you need or want two components of façade having the same text, use the legends.  Make the labels is different so the comic is more readable.

  4. having more than one Dequeue function on the same queue will lead to unpredictable results.  When an item is removed, it is removed from the queue and is not accessible to any other Dequeue function.  In parallel loops, you have no way of guessing which Dequeue will seize any particular element.

  5 use Boolean reverse instead of Select with wired False to true and true cable at the entrance to false entry. Better, just make the case of forgery in the structure of the case within the for loop the real deal. No required reversal.

  6. I was not looking for to determine the logic of the code within the structure of this case. It seems I could have posted a much simpler way to do this several weeks ago.

  7. use multiply from the Digital Palette rather than a node form multiply by 4 or 1.8. Uses less space BD and is much easier to read.

  8. as has been suggested, learn how to work the machine architecture and the State of producer/consumer.  They can make your life much easier.  Do not try to convert immediately to these models.   It's too much bite to at some point.  Learn how they work first.  Make a few simple examples.  Then rewrite this program in this format.  Probably faster than fixing what you have now.

  Lynn

• For loop tunnel exit "Last value" output of default values

  Salvation OR community,

  Today, I came across a probem of LabVIEW stange. A tunnel of release of "Last value" to a for loop back the default values instead of the last real value. The code is below:

  

  Below as screenshots of probes 44 and 45.

  

  

  When the probe 44 contains al the data (all the planks are present (and the correct "Testrack Module" is used)) probe 45 is empty.

  I already tried to remove the complete thread and it rewire. The result was the same.

  However, I also tried to use registers with shift instead of the tunnels and the code works now (see below for the code).

  

  The used version of Labview is 2013 SP1.

  I hope you can help,

  Tim

  Edit: If the images are too small, you can drag it to a new tab, and they become the original size.

  Tim,

  My first assumption: the because the loop never executes as you pass an empty array to an entry of automatic indexation.

  Another option, which is difficult to see in the screenshot: are there two entries of tunnels over the probe nr 42?

  Norbert

• Check if for loop finished

  My question is how to check if the for loop complete? I'm controlling a supply of Genesys Lambda and taking a linearity data. I need to check if the loop is completed, ask the user to reverse polarity and resume data. Got only the first part of work. Looks like I can't just check the loop for the last iteration.

  I have attached my code for anyone to check if possible.

  Thanks for your help.

  Peter

  Altenbach wrote: you could put another loop with a FOR 2 wired to N around the code, display the conditional terminal and exit the loop prematurely, according to the results of the dialog box.

  Here's a quick project, modify as necessary. (There are a few tips, for example, you must enable messages only on iteration 0. Easy to fix. )

  

  (I have DAQ or even understand your material, so I can't test, but things don't seem quite right across.

• Parallel for loop 2D table

  Hello

  I don't have any experience with parallel for loops, so I need your help.

  Goal: To do a calculation (average, average) on the rows (or columns) table 2D as quickly as possible. The calculations are independent of each other and I would get a table 1 d with the results.

  I read a few posts on parallel for loops and I would like to find an example for my trivial problem, but I can't.

  Could you help me, it is possible is improve it the effectiveness of the calculation on lines with parallelism in LabVIEW? and it is, could you post an example how to do?

  Thank you

  If the speed issues, do not write your own "average." First of all, it already is in the range of statistics, but then you must be inline your average VI or do the calculation explicitly (as shown below). the size of the array never changes for the duration of the loop, it seems redundant to get the size of the array on each iteration.

  Here's what you could do.

  

  On my bench, it's much faster than the use of 'mean.vi' of the palette. Average a overhead, Subvi (1) (2) needs to get N with each call and (3) is also an unnecessary error checking.

  (Sorry, I have 32 processors, so the number of instances is set a little high. Modify if needed).

• Aliases for columns in explicit for LOOP sliders

  Hi friends

  In the below block (forloop) I don't get countsal values, but when I run the query, it gives the County. By this (COUNTSAL) the below if condition fails .i don't know why it is failing.

  But when I use it with a simple loop gives a correct result.

  FOR LOOP:

  SCR CL;

  SET SERVEROUTPUT ON;

  DECLARE

  CURSOR C1 IS EMPNO, ENAME, COUNT (SAL) SELECT COUNTSAL OF THE GROUP EMP BY EMPNO, ENAME;

  SHEIKYERBOUTI C1% ROWTYPE;

  BEGIN

  TO IND IN C1

  WHEN the OUTPUT C1% NOTFOUND;

  DBMS_OUTPUT. PUT_LINE (IND. EMPNO);

  DBMS_OUTPUT. PUT_LINE('SALCOUNT:'||) SHEIKYERBOUTI. COUNTSAL);

  IF SHEIKYERBOUTI. COUNTSAL > 0 THEN

  DBMS_OUTPUT. PUT_LINE ('NAME' |) SHEIKYERBOUTI. ENAME);

  END IF;

  END LOOP;

  END;

  simple loop; (get a correct output)

  SCR CL;

  SET SERVEROUTPUT ON;

  DECLARE

  CURSOR C1

  IS

  SELECT EMPNO, ENAME, COUNT (SAL) COUNTSAL OF THE GROUP EMP BY EMPNO, ENAME;

  SHEIKYERBOUTI C1% ROWTYPE;

  BEGIN

  OPEN C1;

  LOOP

  FETCH C1 INTO SHEIKYERBOUTI.

  WHEN EXIT C1% NOTFOUND;

  IF SHEIKYERBOUTI. COUNTSAL > 0 THEN

  DBMS_OUTPUT. PUT_LINE('NAMES:'||) SHEIKYERBOUTI. ENAME);

  END IF;

  END LOOP;

  END;

  Please suggest me.

  Your code is the missilg LOOP keyword. Also, loop for CURSOR automatically closes after extraction of all lines - no OUTPUT WHEN you have to. But the key is to loop to extract CURSOR loop lines said variable registration - a following KEYWORD, IND in your case:

  DECLARE

  CURSOR C1 IS EMPNO, ENAME, COUNT (SAL) SELECT COUNTSAL OF THE GROUP EMP BY EMPNO, ENAME;

  BEGIN

  TO IND IN C1 LOOP

  DBMS_OUTPUT. PUT_LINE (IND. EMPNO);

  DBMS_OUTPUT. PUT_LINE('SALCOUNT:'||) UNRELIABLE COUNTSAL);

  IF COUNTSAL > 0 THEN.

  DBMS_OUTPUT. PUT_LINE ('NAME' |) UNRELIABLE ENAME);

  END IF;

  END LOOP;

  END;

  /

  7521
  SALCOUNT: 1
  NAMESWARD
  7566
  SALCOUNT: 1
  NAMESJONES
  7844
  SALCOUNT: 1
  NAMESTURNER
  7876
  SALCOUNT: 1
  NAMESADAMS
  7499
  SALCOUNT: 1
  NAMESALLEN
  7369
  SALCOUNT: 1
  NAMESSMITH
  7782
  SALCOUNT: 1
  NAMESCLARK
  7839
  SALCOUNT: 1
  NAMESKING
  7698
  SALCOUNT: 1
  NAMESBLAKE
  7900
  SALCOUNT: 1
  NAMESJAMES
  7902
  SALCOUNT: 1
  NAMESFORD
  7788
  SALCOUNT: 1
  NAMESSCOTT
  7654
  SALCOUNT: 1
  NAMESMARTIN
  7934
  SALCOUNT: 1
  NAMESMILLER

  PL/SQL procedure successfully completed.

  SQL >

  SY.

• PLSQL cursor for loop - no_data_found exception

  Hi all

  Please, could you help me. I start to learn PL/SQL, so please be pattient.

  the very simple block. Base table emp (for Oracle), he sucks with more then 5000 large salary. I thought that the result would be "aaa", but result is actually empty.

  declare
    cursor c1 (v_num number) is
      select ename,sal
      from emp
      where sal > v_num;
  begin
    for rec in c1(5000) LOOP
      begin
      dbms_output.put_line('Employee: ' || rec.ename || ' has a salary of ' || rec.sal);
    exception
    WHEN NO_DATA_FOUND THEN
      dbms_output.put_line('aaa ');
    end;
    END LOOP ;
  end;
  /
  
  

  How can I solve this problem?

  Thank you much for the help.

  With the help of a cursor for loop will never throw an exception no_data_found.

  Despite everything, you try to catch all exceptions thrown by dbms_output.

• How to optimize the select query executed in a cursor for loop?

  Hi friends,
  
  I run the code below and clocked at the same time for each line of code using DBMS_PROFILER.

  CREATE OR REPLACE PROCEDURE TEST
  AS
     p_file_id              NUMBER                                   := 151;
     v_shipper_ind          ah_item.shipper_ind%TYPE;
     v_sales_reserve_ind    ah_item.special_sales_reserve_ind%TYPE;
     v_location_indicator   ah_item.exe_location_ind%TYPE;
  
     CURSOR activity_c
     IS
        SELECT *
          FROM ah_activity_internal
         WHERE status_id = 30
           AND file_id = p_file_id;
  BEGIN
     DBMS_PROFILER.start_profiler ('TEST');
  
     FOR rec IN activity_c
     LOOP
        SELECT DISTINCT shipper_ind, special_sales_reserve_ind, exe_location_ind
                   INTO v_shipper_ind, v_sales_reserve_ind, v_location_indicator
                   FROM ah_item --464000 rows in this table
                  WHERE item_id_edw IN (
                           SELECT item_id_edw
                             FROM ah_item_xref --700000 rows in this table
                            WHERE item_code_cust = rec.item_code_cust
                              AND facility_num IN (
                                     SELECT facility_code
                                       FROM ah_chain_div_facility --17 rows in this table
                                      WHERE chain_id = ah_internal_data_pkg.get_chain_id (p_file_id)
                                        AND div_id = (SELECT div_id
                                                        FROM ah_div --8 rows in this table 
                                                       WHERE division = rec.division)));
     END LOOP;
  
     DBMS_PROFILER.stop_profiler;
  EXCEPTION
     WHEN NO_DATA_FOUND
     THEN
        NULL;
     WHEN TOO_MANY_ROWS
     THEN
        NULL;
  END TEST;

  The SELECT inside the LOOP FOR cursor query took 773 seconds.
  I tried to use COLLECT in BULK instead of a cursor for loop, but it did not help.
  When I took the select query separately and executed with a value of the sample, and then he gave the results in a Flash of a second.
  
  All tables have primary key index.
  Any ideas what can be done to make this code more efficient?
  
  Thank you
  Raj.

  DECLARE
    v_chain_id ah_chain_div_facility.chain_id%TYPE := ah_internal_data_pkg.get_chain_id (p_file_id);
  
    CURSOR cur_loop IS
    SELECT * -- better off explicitly specifying columns
    FROM ah_activity_internal aai,
    (SELECT DISTINCT aix.item_code_cust, ad.division, ai.shipper_ind, ai.special_sales_reserve_ind, ai.exe_location_ind
       INTO v_shipper_ind, v_sales_reserve_ind, v_location_indicator
       FROM ah_item ai, ah_item_xref aix, ah_chain_div_facility acdf, ah_div ad
      WHERE ai.item_id_edw = aix.item_id_edw
        AND aix.facility_num = acdf.facility_code
        AND acdf.chain_id = v_chain_id
        AND acdf.div_id = ad.div_id) d
    WHERE aai.status_id = 30
      AND aai.file_id = p_file_id
      AND d.item_code_cust = aai.item_code_cust
      AND d.division = aai.division;         
  
  BEGIN
    FOR rec IN cur_loop LOOP
      ... DO your stuff ...
    END LOOP;
  END;  
  

  Published by: Dave hemming on December 4, 2008 09:17

• How to loop through the results of a select statement in a process flow?

  Hello
  
  I use Warehouse Builder 10 g R2.
  
  I'm trying to implement a loop in a process stream that runs through the results of a select statement.
  
  In pl/sql, it would be implemented as a for loop by using a slider, but I simply doesn't work how to do this using the loops in the process flow.
  
  Someone at - it ideas?
  
  Thank you
  Liffey

  Liffey,
  Look at this thread
  For or while loop a loop in the process flow

  Kind regards
  Oleg

• parallel processing: for loop taking place

  Hallo,

  I have a loop 'for' runnin on this system: LabVIEW2009, windows7, intel i7.

  I wonder if and how I can tell to LabVIEW that he would be allowed to run different iterations of the loop at the same time (concurrently) on my processor with 8 cores.

  Now, it will execute the next iteration when it ended the previous, even one so is there no dependencies in iterations.

  I want to give a 'ownership' of the loop, which means that it can be "unfolded" for parallel execution.

  Thank you

  Pier

  pop up on for loop and select "configure interation Prallelism."

  Activate it.

  Wire a certain number to the new 'P' of entry to specify how many processors to spread it everywhere.

  Ben

• for loop in formula node does not

  Hello

  I; m trying to use for loop in the node of the formula, but it is does not work. I want the output (y1) product value in certain range (a and d, and of course one is smaller than d). I ' do not use primitive labview since a and d are keep changing (both are variable). I tried to put "return 0;" after the y1 equation but the error popup.

  The issue of the loop works not because it gives the last value (I average would be ""). It does not begin with an (initial) value.

  Please help me how to solve this problem...

  Pls ignore other variables not used in the equation. Thank you!! A lot

  Your code works.

  

  But why you use loop?
  You get the last value, so you can get it in a single step with x correct;

  Also why you say that can not use primitives?
  If you use wire instead of terminals or local variable States values constant.

  Y1, y1_2, y1 3 is the same values calculated differently.

  

• For loop runs with the value of N unwired

  In this case will be a loop run connected to the loop N worthless? I have seen a few examples of the loop for run without a certain number of times set to be ran wired or for example a size of table or something like that.

  PauldePaor wrote:

  Here's a program I am and as you can see the image that the program runs without the loop N being wired. The program will run without problem

  As everyone else has said, you don't have to plug something on N.  If you wire up a table for loop for input "auto-index", the loop for will run automatically the smaller table size.

  Perhaps an example will help:

  

  This makes a loop on my table size (in this case, long of 5 elements).  On the edge of the loop for which resembles [] brackets, indicates that it is auto-indexé.  The loop should go through each item one at a time (1, then 2, then 3, then 4, then 5).

• Préallouée VI environment in paralleled for loop

  Hello

  I searched a bit and couldn't find that everything about this specific issue.

  If I have a Subvi in a parallelized for loop and the Subvi is set upon reentrant preallouee clone, the Subvi register also several characteristics of memory depending on the number of loop iteration For? My specific application is a Subvi containingvibration Analytisis screw using the previous data in their spread and filters.

  Thank you!

  
  

• For loop creates 1 d data table

  Hello, I am building the circuit below, and I'm running into a lot of problems with the loop, creating a table 1 d of data from certain types of data such as the ERROR OUT and the VISA NAME of RESOURCE. I understand why it does this, but I only need the last value in the table (the value of the last iteration of the loop for). This is true for me for the error, resource name of visa, and I was thinking of using the Boolean value that indicates when the for loop.

  Is there a simple way to extract the last value in the table 1-D so that it is correct to pass along trails, VISA and ERROR type?

  You actually create a block diagram, not a circuit.  A circuit is an electrical system including devices and wires.

  If you right-click on the tunnel and choose disable indexing, then you get the value of the last iteration rather than a 1 d table.

  I recommend you watch the LabVIEW tutorials online
  LabVIEW Introduction course - 3 hours
  LabVIEW Introduction course - 6 hours