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OpenMP threads, how to use omp atomic clauses correctly?



The Next CEO of Stack OverflowHow do I update the GUI from another thread?Improve INSERT-per-second performance of SQLite?Dividing sections inside an omp parallel for : OpenMPHow to use threading in Python?OpenMP threads “disobey” omp barriergcc openmp thread reuseRacing conditions in quicksort written in C parallelized with OpenMPOpenMP: sharing arrays between threadsHow to nest parallel loops in a sequential loop with OpenMPIs OpenMP atomic write needed if other threads read only the shared data?










1















I'm trying to parallel a program that reads repetitively strings in pairs from a file. I want to use the omp atomic so as to make sure that in every loop the pair will be read correctly. I'm gonna use it like this in my code :



#pragma omp atomic 

if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);



My problem is that I don't know what is the difference between the clases (read,write, update, capture) so as to use the correct one.
getmystring(fp) is the function that reads one string at a time from the file.










share|improve this question


























    1















    I'm trying to parallel a program that reads repetitively strings in pairs from a file. I want to use the omp atomic so as to make sure that in every loop the pair will be read correctly. I'm gonna use it like this in my code :



    #pragma omp atomic 

    if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
    if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);



    My problem is that I don't know what is the difference between the clases (read,write, update, capture) so as to use the correct one.
    getmystring(fp) is the function that reads one string at a time from the file.










    share|improve this question
























      1












      1








      1








      I'm trying to parallel a program that reads repetitively strings in pairs from a file. I want to use the omp atomic so as to make sure that in every loop the pair will be read correctly. I'm gonna use it like this in my code :



      #pragma omp atomic 

      if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
      if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);



      My problem is that I don't know what is the difference between the clases (read,write, update, capture) so as to use the correct one.
      getmystring(fp) is the function that reads one string at a time from the file.










      share|improve this question














      I'm trying to parallel a program that reads repetitively strings in pairs from a file. I want to use the omp atomic so as to make sure that in every loop the pair will be read correctly. I'm gonna use it like this in my code :



      #pragma omp atomic 

      if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
      if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);



      My problem is that I don't know what is the difference between the clases (read,write, update, capture) so as to use the correct one.
      getmystring(fp) is the function that reads one string at a time from the file.







      c multithreading ubuntu parallel-processing openmp






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Mar 8 at 12:40









      Athanasia PavlidouAthanasia Pavlidou

      618




      618






















          1 Answer
          1






          active

          oldest

          votes


















          1














          It looks like you've chosen the wrong OpenMP construct. The objective seems to be to allow only one thread to execute in your block at a time. That means the block is intended to be a critical region, and the directive to use for declaring it one is omp critical:



          #pragma omp critical 

          if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
          if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);






          share|improve this answer























          • There are key differences between the constructs. The critical construct is mutually exclusive in the sense that all thread compete for the same lock (or different locks if a name is added to the construct). An atomic construct only supports certain expressions and statements, and also is effective on a particular memory location. That means, an atomic region for a[i] will likely run concurrently with another atomic on a[j] if i != j.

            – Michael Klemm
            Mar 8 at 18:45











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          1 Answer
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          oldest

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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          1














          It looks like you've chosen the wrong OpenMP construct. The objective seems to be to allow only one thread to execute in your block at a time. That means the block is intended to be a critical region, and the directive to use for declaring it one is omp critical:



          #pragma omp critical 

          if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
          if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);






          share|improve this answer























          • There are key differences between the constructs. The critical construct is mutually exclusive in the sense that all thread compete for the same lock (or different locks if a name is added to the construct). An atomic construct only supports certain expressions and statements, and also is effective on a particular memory location. That means, an atomic region for a[i] will likely run concurrently with another atomic on a[j] if i != j.

            – Michael Klemm
            Mar 8 at 18:45















          1














          It looks like you've chosen the wrong OpenMP construct. The objective seems to be to allow only one thread to execute in your block at a time. That means the block is intended to be a critical region, and the directive to use for declaring it one is omp critical:



          #pragma omp critical 

          if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
          if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);






          share|improve this answer























          • There are key differences between the constructs. The critical construct is mutually exclusive in the sense that all thread compete for the same lock (or different locks if a name is added to the construct). An atomic construct only supports certain expressions and statements, and also is effective on a particular memory location. That means, an atomic region for a[i] will likely run concurrently with another atomic on a[j] if i != j.

            – Michael Klemm
            Mar 8 at 18:45













          1












          1








          1







          It looks like you've chosen the wrong OpenMP construct. The objective seems to be to allow only one thread to execute in your block at a time. That means the block is intended to be a critical region, and the directive to use for declaring it one is omp critical:



          #pragma omp critical 

          if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
          if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);






          share|improve this answer













          It looks like you've chosen the wrong OpenMP construct. The objective seems to be to allow only one thread to execute in your block at a time. That means the block is intended to be a critical region, and the directive to use for declaring it one is omp critical:



          #pragma omp critical 

          if(a = getmystring(fp)) fprintf(fpw, "A: %sn", a);
          if(b = getmystring(fp)) fprintf(fpw, "B: %sn", b);







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Mar 8 at 12:56









          John BollingerJohn Bollinger

          84.5k74279




          84.5k74279












          • There are key differences between the constructs. The critical construct is mutually exclusive in the sense that all thread compete for the same lock (or different locks if a name is added to the construct). An atomic construct only supports certain expressions and statements, and also is effective on a particular memory location. That means, an atomic region for a[i] will likely run concurrently with another atomic on a[j] if i != j.

            – Michael Klemm
            Mar 8 at 18:45

















          • There are key differences between the constructs. The critical construct is mutually exclusive in the sense that all thread compete for the same lock (or different locks if a name is added to the construct). An atomic construct only supports certain expressions and statements, and also is effective on a particular memory location. That means, an atomic region for a[i] will likely run concurrently with another atomic on a[j] if i != j.

            – Michael Klemm
            Mar 8 at 18:45
















          There are key differences between the constructs. The critical construct is mutually exclusive in the sense that all thread compete for the same lock (or different locks if a name is added to the construct). An atomic construct only supports certain expressions and statements, and also is effective on a particular memory location. That means, an atomic region for a[i] will likely run concurrently with another atomic on a[j] if i != j.

          – Michael Klemm
          Mar 8 at 18:45





          There are key differences between the constructs. The critical construct is mutually exclusive in the sense that all thread compete for the same lock (or different locks if a name is added to the construct). An atomic construct only supports certain expressions and statements, and also is effective on a particular memory location. That means, an atomic region for a[i] will likely run concurrently with another atomic on a[j] if i != j.

          – Michael Klemm
          Mar 8 at 18:45



















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