compilation : ```gcc -g -pg -o student_rank student_rank.c heapsort.c bubblesort.c``` premier test: ```./student_rank 5 5 1``` lancement de gprof: ```gprof ./student_rank``` ```Flat profile: Each sample counts as 0.01 seconds. no time accumulated % cumulative self self total time seconds seconds calls Ts/call Ts/call name 0.00 0.00 0.00 30 0.00 0.00 bubblesort 0.00 0.00 0.00 25 0.00 0.00 find_rank_student 0.00 0.00 0.00 10 0.00 0.00 print_array 0.00 0.00 0.00 5 0.00 0.00 generate_array 0.00 0.00 0.00 2 0.00 0.00 free_array 0.00 0.00 0.00 2 0.00 0.00 print_student_array 0.00 0.00 0.00 1 0.00 0.00 generate_grades 0.00 0.00 0.00 1 0.00 0.00 generate_ranks 0.00 0.00 0.00 1 0.00 0.00 sort_students ``` 30 appel de bubblesort et 25 appel de find_rank_student call graph : ``` Call graph (explanation follows) granularity: each sample hit covers 2 byte(s) no time propagated index % time self children called name 0.00 0.00 5/30 sort_students [9] 0.00 0.00 25/30 find_rank_student [2] [1] 0.0 0.00 0.00 30 bubblesort [1] ----------------------------------------------- 0.00 0.00 25/25 sort_students [9] [2] 0.0 0.00 0.00 25 find_rank_student [2] 0.00 0.00 25/30 bubblesort [1] ----------------------------------------------- 0.00 0.00 10/10 print_student_array [6] [3] 0.0 0.00 0.00 10 print_array [3] ----------------------------------------------- 0.00 0.00 5/5 generate_grades [7] [4] 0.0 0.00 0.00 5 generate_array [4] ----------------------------------------------- 0.00 0.00 2/2 main [16] [5] 0.0 0.00 0.00 2 free_array [5] ----------------------------------------------- 0.00 0.00 2/2 main [16] [6] 0.0 0.00 0.00 2 print_student_array [6] 0.00 0.00 10/10 print_array [3] ----------------------------------------------- 0.00 0.00 1/1 main [16] [7] 0.0 0.00 0.00 1 generate_grades [7] 0.00 0.00 5/5 generate_array [4] ----------------------------------------------- 0.00 0.00 1/1 main [16] [8] 0.0 0.00 0.00 1 generate_ranks [8] ----------------------------------------------- 0.00 0.00 1/1 main [16] [9] 0.0 0.00 0.00 1 sort_students [9] 0.00 0.00 25/25 find_rank_student [2] 0.00 0.00 5/30 bubblesort [1] ----------------------------------------------- ``` - 30 appel de bubblesort - 5 appel de sort_student - 25 appel de find_rank_student
sort_student appel 25 fois find_rank_student et 5 fois bubblesort
find_rank_student appel 25 fois bubblesort nouveau scénario via la commande suivante : ```./student_rank 1000 1000 0``` lancement de gprof : ```gprof ./student_rank``` résultats: ```Flat profile: Each sample counts as 0.01 seconds. % cumulative self self total time seconds seconds calls s/call s/call name 83.16 5.11 5.11 1001000 0.00 0.00 bubblesort 16.30 6.11 1.00 1000000 0.00 0.00 find_rank_student 0.65 6.15 0.04 1 0.04 6.15 sort_students 0.00 6.15 0.00 1000 0.00 0.00 generate_array 0.00 6.15 0.00 2 0.00 0.00 free_array 0.00 6.15 0.00 1 0.00 0.00 generate_grades 0.00 6.15 0.00 1 0.00 0.00 generate_ranks ``` - 1001000 appel de bubblesort - 1000000 appel de find_rank_student
execution du programme en 6.15s call graph : ``` Call graph (explanation follows) granularity: each sample hit covers 2 byte(s) for 0.16% of 6.15 seconds index % time self children called name 0.04 6.11 1/1 main [2] [1] 100.0 0.04 6.11 1 sort_students [1] 1.00 5.10 1000000/1000000 find_rank_student [3] 0.01 0.00 1000/1001000 bubblesort [4] ----------------------------------------------- [2] 100.0 0.00 6.15 main [2] 0.04 6.11 1/1 sort_students [1] 0.00 0.00 2/2 free_array [6] 0.00 0.00 1/1 generate_grades [7] 0.00 0.00 1/1 generate_ranks [8] ----------------------------------------------- 1.00 5.10 1000000/1000000 sort_students [1] [3] 99.3 1.00 5.10 1000000 find_rank_student [3] 5.10 0.00 1000000/1001000 bubblesort [4] ----------------------------------------------- 0.01 0.00 1000/1001000 sort_students [1] 5.10 0.00 1000000/1001000 find_rank_student [3] [4] 83.1 5.11 0.00 1001000 bubblesort [4] ----------------------------------------------- 0.00 0.00 1000/1000 generate_grades [7] [5] 0.0 0.00 0.00 1000 generate_array [5] ----------------------------------------------- 0.00 0.00 2/2 main [2] [6] 0.0 0.00 0.00 2 free_array [6] ----------------------------------------------- 0.00 0.00 1/1 main [2] [7] 0.0 0.00 0.00 1 generate_grades [7] 0.00 0.00 1000/1000 generate_array [5] ----------------------------------------------- 0.00 0.00 1/1 main [2] [8] 0.0 0.00 0.00 1 generate_ranks [8] ----------------------------------------------- ``` ## arbre d'appel du programme : ## 
main
|-->generate_grades
|       |-->generate_array
|-->generate_ranks
|-->sort_students
|       |-->find_rank_student
|       |            |-->bubblesort
|       |-->bubblesort
|-->free_array



## optimisation du programme : ##

- réduire les appel de bubblesort
- optimiser bubbesort (plus complexe)
- réduire les appel de sort_student car elle appelle les autres fonctions

### changmenent effectué : ###
suppression de la ligne 58 de student_rank.c