Detailed autoscoping results are displayed in the compiler commentary, The compiler produces an inline commentary when the source is compiled with the -g option. The commentary can be viewed with the er_src command, as shown in the following example. The er_src command is provided as part of the Oracle Developer Studio software. For more information, see the er_src(1) man page or the Oracle Developer Studio 12.6: Performance Analyzer.
For a quick check of autoscoping results, compile with the -xvpara option. Compiling with —xvpara will give you a general idea about whether autoscoping for a particular construct was successful.
Example 16 Checking Autoscoping Results With -xvpara% cat source1.f INTEGER X(100), Y(100), I, T C$OMP PARALLEL DO DEFAULT(__AUTO) DO I=1, 100 T = Y(I) X(I) = T*T END DO C$OMP END PARALLEL DO END % f95 -xopenmp -xO3 -xvpara -c -g source1.f "source1.f", line 2: Autoscoping for OpenMP construct succeeded. Check er_src for details
If autoscoping fails for a particular construct, a warning message is issued when -xvpara is specified, as shown in the following example.
Example 17 Autoscoping Failure With -xvpara% cat source2.f INTEGER X(100), Y(100), I, T C$OMP PARALLEL DO DEFAULT(__AUTO) DO I=1, 100 T = Y(I) CALL FOO(X) X(I) = T*T END DO C$OMP END PARALLEL DO END % f95 -xopenmp -xO3 -xvpara -c -g source2.f "source2.f", line 2: Warning: Autoscoping for OpenMP construct failed. Check er_src for details. Parallel region will be executed by a single thread.
More detailed autoscoping information appears in the compiler commentary displayed by er_src, as shown in the following example.
Example 18 Detailed Autoscoping Results Displayed Using er_src% er_src source2.o Source file: source2.f Object file: source2.o Load Object: source2.o 1. INTEGER X(100), Y(100), I, T Source OpenMP region below has tag R1 Variables autoscoped as SHARED in R1: y Variables autoscoped as PRIVATE in R1: t, i Variables treated as shared because they cannot be autoscoped in R1: x R1 will be executed by a single thread because autoscoping for some variable s was not successful Private variables in R1: i, t Shared variables in R1: y, x 2. C$OMP PARALLEL DO DEFAULT(__AUTO) Source loop below has tag L1 L1 parallelized by explicit user directive L1 autoparallelized L1 parallel loop-body code placed in function _$d1A2.MAIN_ along with 0 inner loops L1 could not be pipelined because it contains calls 3. DO I=1, 100 4. T = Y(I) 5. CALL FOO(X) 6. X(I) = T*T 7. END DO 8. C$OMP END PARALLEL DO 9. END 10.