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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?
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
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
add a comment |
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
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
add a comment |
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
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
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
c multithreading ubuntu parallel-processing openmp
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
asked Mar 8 at 12:40
Athanasia PavlidouAthanasia Pavlidou
618
618
add a comment |
add a comment |
1 Answer
1
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votes
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);
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
There are key differences between the constructs. Thecriticalconstruct 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). Anatomicconstruct only supports certain expressions and statements, and also is effective on a particular memory location. That means, anatomicregion for a[i] will likely run concurrently with anotheratomicon a[j] if i != j.
– Michael Klemm
Mar 8 at 18:45
add a comment |
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1 Answer
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1 Answer
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active
oldest
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active
oldest
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active
oldest
votes
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);
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
There are key differences between the constructs. Thecriticalconstruct 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). Anatomicconstruct only supports certain expressions and statements, and also is effective on a particular memory location. That means, anatomicregion for a[i] will likely run concurrently with anotheratomicon a[j] if i != j.
– Michael Klemm
Mar 8 at 18:45
add a comment |
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);
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
There are key differences between the constructs. Thecriticalconstruct 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). Anatomicconstruct only supports certain expressions and statements, and also is effective on a particular memory location. That means, anatomicregion for a[i] will likely run concurrently with anotheratomicon a[j] if i != j.
– Michael Klemm
Mar 8 at 18:45
add a comment |
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);
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
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);
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
answered Mar 8 at 12:56
John BollingerJohn Bollinger
84.5k74279
84.5k74279
There are key differences between the constructs. Thecriticalconstruct 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). Anatomicconstruct only supports certain expressions and statements, and also is effective on a particular memory location. That means, anatomicregion for a[i] will likely run concurrently with anotheratomicon a[j] if i != j.
– Michael Klemm
Mar 8 at 18:45
add a comment |
There are key differences between the constructs. Thecriticalconstruct 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). Anatomicconstruct only supports certain expressions and statements, and also is effective on a particular memory location. That means, anatomicregion for a[i] will likely run concurrently with anotheratomicon 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
add a comment |
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