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Performances Django REST framework - DjangoCong...
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xordoquy
June 16, 2016
Programming
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Performances Django REST framework - DjangoCong 2016
Un petit coup d'oeil sur les performances de Django REST framework.
xordoquy
June 16, 2016
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Transcript
Django REST framework performances DjangoCong 2016 Xavier Ordoquy (@linovia_net)
Extensibilité =/= Performance
Extensible: Plus de requêtes par seconde
Performance: Moins de temps par requête
Extensible: Architecture
Performance: Algorithme
La mesure de performance: subjectif
Python 3.4 Python 3.5 16,711 ms 22,322 ms
Django vs. Django REST framework
• Négociation de contenu • Passeurs • Renderers • Throttling
• Pagination • Authentification • Permissions
class Invoice(models.Model): name = models.CharField(max_length=128) comments = models.TextField() total =
models.DecimalField( max_digits=9, decimal_places=2) owner = models.ForeignKey( settings.AUTH_USER_MODEL) assignee = models.ForeignKey( settings.AUTH_USER_MODEL)
@csrf_exempt def create_invoice(request): if request.method == 'GET': serialized_invoices = [
serialize(invoice) for invoice in models.Invoice.objects.all() ] return HttpResponse( content=json.dumps(serialzied_invoices), content_type='application/json', )
@csrf_exempt def create_invoice(request): if request.method == 'POST': form = forms.Invoice(request.POST
or None) if form.is_valid(): invoice = form.save() result = serialize(invoice) return HttpResponse( content=json.dumps(result), content_type='application/json', )
class InvoiceSerializer(serializers.ModelSerializer): class Meta: model = models.Invoice fields = ('id',
'name', 'comments', 'total') class InvoiceViewSet(viewsets.ModelViewSet): queryset = models.Invoice.objects.all() serializer_class = serializers.Invoice def perform_create(self, serializer): serializer.save(owner_id=1, assignee_id=1)
0 0,9 1,8 2,7 3,6 3,473 ms 2,159 ms Django
DRF Liste avec 2 objets +60%
0 3,25 6,5 9,75 13 12,717 ms 9,599 ms Django
DRF Liste avec 100 objets +32%
0 3,25 6,5 9,75 13 10,578 ms 12,868 ms Django
DRF Creation d’un objet -21%
Qui fait quoi et quand ?
ORM
Cycle de la requête
Sérialisation
Vue
Titre 0,20 0,40 0,60 0,80 1,00 1,20 11,36 % 13,7
% 7,9 % 67,0 % ORM Sérialiseur Vue Requête Détail d’un objet
0,00 % 20,00 % 40,00 % 60,00 % 80,00 %
100,00 % 120,00 % 6,271 % 1,621 % 55,349 % 36,759 % ORM Sérialiseur Vue Requête Liste de 100 objets
0,00 % ms 20,00 % ms 40,00 % ms 60,00
% ms 80,00 % ms 00,00 % ms 20,00 % ms 5,808 % 2,538 % 7,874 % 83,78 % ORM Sérialiseur Vue Requête Création d’un objet
Optimiser
Cacher les requêtes DB
Supprimer la sérialisation
def list(self, request, *args, **kwargs): queryset = self.filter_queryset( self.get_queryset()) #
Pagination serializer = self.get_serializer( queryset, many=True ) return Response(serializer.data)
def list(self, request, *args, **kwargs): queryset = self.filter_queryset( self.get_queryset()) #
Pagination data = models.Invoice.objects.values( 'id', 'name', 'comments', 'total' ) return Response(data)
• Nettoyer les middlewares • Faire un rendu direct •
Désactiver la négociation de contenu
Moments WTF ?!?
queryset évalué 2 fois
class RelatedField(Field): def get_queryset(self): queryset = self.queryset if isinstance(queryset, (QuerySet,
Manager)): queryset = queryset.all() return queryset
WTF ? selected_related n’est pas fonctionnel ?
selected_related n’est pas fonctionnel durant l’update ! (Django #21584)
Stop aux ModelSerializers !
Vive les Serializers !
Questions ? https://www.dabapps.com/blog/api-performance-profiling- django-rest-framework/ https://github.com/xordoquy/django-rest-framework- benchmark