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modif/notes.md
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138
modif/notes.md
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compilation :
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gcc -g -pg -o student_rank student_rank.c heapsort.c bubblesort.c
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premier test:
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./student_rank 5 5 1
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lancement de gprof:
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'''gprof ./student_rank'''
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'''
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Flat profile:
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Each sample counts as 0.01 seconds.
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no time accumulated
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% cumulative self self total
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time seconds seconds calls Ts/call Ts/call name
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0.00 0.00 0.00 30 0.00 0.00 bubblesort
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0.00 0.00 0.00 25 0.00 0.00 find_rank_student
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0.00 0.00 0.00 10 0.00 0.00 print_array
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0.00 0.00 0.00 5 0.00 0.00 generate_array
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0.00 0.00 0.00 2 0.00 0.00 free_array
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0.00 0.00 0.00 2 0.00 0.00 print_student_array
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0.00 0.00 0.00 1 0.00 0.00 generate_grades
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0.00 0.00 0.00 1 0.00 0.00 generate_ranks
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0.00 0.00 0.00 1 0.00 0.00 sort_students
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par exemple on peut voir que la fonction bubblesort a été appelée 30 fois et que la fonction find_rank_student a été appelée 25 fois.
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exemple du call graph :
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Call graph (explanation follows)
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granularity: each sample hit covers 2 byte(s) no time propagated
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index % time self children called name
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0.00 0.00 5/30 sort_students [9]
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0.00 0.00 25/30 find_rank_student [2]
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[1] 0.0 0.00 0.00 30 bubblesort [1]
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-----------------------------------------------
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0.00 0.00 25/25 sort_students [9]
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[2] 0.0 0.00 0.00 25 find_rank_student [2]
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0.00 0.00 25/30 bubblesort [1]
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-----------------------------------------------
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0.00 0.00 10/10 print_student_array [6]
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[3] 0.0 0.00 0.00 10 print_array [3]
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-----------------------------------------------
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0.00 0.00 5/5 generate_grades [7]
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[4] 0.0 0.00 0.00 5 generate_array [4]
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-----------------------------------------------
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0.00 0.00 2/2 main [16]
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[5] 0.0 0.00 0.00 2 free_array [5]
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-----------------------------------------------
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0.00 0.00 2/2 main [16]
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[6] 0.0 0.00 0.00 2 print_student_array [6]
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0.00 0.00 10/10 print_array [3]
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-----------------------------------------------
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0.00 0.00 1/1 main [16]
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[7] 0.0 0.00 0.00 1 generate_grades [7]
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0.00 0.00 5/5 generate_array [4]
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-----------------------------------------------
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0.00 0.00 1/1 main [16]
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[8] 0.0 0.00 0.00 1 generate_ranks [8]
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-----------------------------------------------
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0.00 0.00 1/1 main [16]
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[9] 0.0 0.00 0.00 1 sort_students [9]
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0.00 0.00 25/25 find_rank_student [2]
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0.00 0.00 5/30 bubblesort [1]
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-----------------------------------------------
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'''
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par exemple on peut voir que la fonction bubblesort a été appelée 30 fois, 5 fois par la fonction sort_students et 25 fois par la fonction find_rank_student.
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la fonction find_rank_student a été appelée 25 fois par sort_students et à chaque fois elle appelle la fonction bubblesort.
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on a relancé le scénario en changeant les paramètres de la commande :
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./student_rank 1000 1000 0
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on a relancé gprof avec la commande suivante :
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gprof ./student_rank
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un apperçu du résultat est donné ci-dessous :
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Flat profile:
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Each sample counts as 0.01 seconds.
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% cumulative self self total
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time seconds seconds calls s/call s/call name
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83.16 5.11 5.11 1001000 0.00 0.00 bubblesort
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16.30 6.11 1.00 1000000 0.00 0.00 find_rank_student
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0.65 6.15 0.04 1 0.04 6.15 sort_students
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0.00 6.15 0.00 1000 0.00 0.00 generate_array
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0.00 6.15 0.00 2 0.00 0.00 free_array
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0.00 6.15 0.00 1 0.00 0.00 generate_grades
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0.00 6.15 0.00 1 0.00 0.00 generate_ranks
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en comparaison avec le premier scénario, on peut voir que la fonction bubblesort a été appelée 1001000 fois et que la fonction find_rank_student a été appelée 1000000 fois.
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on peut voir aussi que le programme a passé 6.15 secondes à exécuter alors que dans le premier scénario il n'a pas accumulé de temps.
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exemple du call graph :
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Call graph (explanation follows)
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granularity: each sample hit covers 2 byte(s) for 0.16% of 6.15 seconds
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index % time self children called name
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0.04 6.11 1/1 main [2]
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[1] 100.0 0.04 6.11 1 sort_students [1]
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1.00 5.10 1000000/1000000 find_rank_student [3]
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0.01 0.00 1000/1001000 bubblesort [4]
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-----------------------------------------------
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<spontaneous>
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[2] 100.0 0.00 6.15 main [2]
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0.04 6.11 1/1 sort_students [1]
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0.00 0.00 2/2 free_array [6]
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0.00 0.00 1/1 generate_grades [7]
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0.00 0.00 1/1 generate_ranks [8]
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-----------------------------------------------
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1.00 5.10 1000000/1000000 sort_students [1]
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[3] 99.3 1.00 5.10 1000000 find_rank_student [3]
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5.10 0.00 1000000/1001000 bubblesort [4]
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-----------------------------------------------
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0.01 0.00 1000/1001000 sort_students [1]
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5.10 0.00 1000000/1001000 find_rank_student [3]
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[4] 83.1 5.11 0.00 1001000 bubblesort [4]
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-----------------------------------------------
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0.00 0.00 1000/1000 generate_grades [7]
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[5] 0.0 0.00 0.00 1000 generate_array [5]
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-----------------------------------------------
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0.00 0.00 2/2 main [2]
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[6] 0.0 0.00 0.00 2 free_array [6]
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-----------------------------------------------
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0.00 0.00 1/1 main [2]
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[7] 0.0 0.00 0.00 1 generate_grades [7]
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0.00 0.00 1000/1000 generate_array [5]
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-----------------------------------------------
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0.00 0.00 1/1 main [2]
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[8] 0.0 0.00 0.00 1 generate_ranks [8]
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-----------------------------------------------
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