akshar-raaj

Performance Analysis of Nginx with Increasing Concurrent Users

Summary of Findings

1. Total Requests per Second (RPS):
   • Run #1: Low RPS, likely due to minimal concurrent users.
   • Run #2: Steady increase in RPS, reaching around 200 requests per second.
   • Run #3: Further increase, stabilizing around 800–900 requests per second.
   • Run #4: Peaks at approximately 1,000 requests per second. Notably, no failures occurred across all runs, indicating strong stability and load-handling capacity.

akshar-raaj

Optimizing Nginx and Python Configuration with Load Testing: A Case Study
Objective
The goal of this experiment was to determine how many concurrent users and requests per second a modest server configuration could handle with a basic Nginx and Python web application setup. The server in question has 1 GB RAM and a 2000 MHz single-core CPU, hosted on Linode.

Initial Setup
We started with a high-performance Nginx server capable of handling 10,000 requests per second for static content. For dynamic content, we configured Nginx to route requests to a Python web application. The web application simulates both CPU-bound tasks and a database operation with a total processing time of approximately 20 milliseconds per request, giving the backend the ability to serve at most 50 requests per second.

The backend Python application was served by a single instance initially, and Nginx was configured to proxy requests to this backend:

nginx

akshar-raaj

This post is targetted towards Celery beginners. It discusses different ways to run Celery.

• Using celery with a single module
• Using celery with multiple modules.
• Using celery with multiple modules split across packages.

Prerequisites

You should have Celery and Redis installed. We will use Redis as our broker.

akshar-raaj

Question.objects.values('question_text').annotate(cnt=Count('question_text'))

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Question.objects.annotate(avg_votes=Avg('choice__votes'))

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Choice.objects.aggregate(avg=Avg('votes'))

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Choice.objects.aggregate(num_votes=Sum('votes'))

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Question.objects.annotate(num_votes=Sum('choice__votes')).filter(num_votes__isnull=True)

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Question.objects.annotate(num_votes=Sum('choice__votes')).filter(num_votes__isnull=False).order_by('num_votes')[0]

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Question.objects.annotate(num_votes=Sum('choice__votes')).filter(num_votes__isnull=False).order_by('-num_votes')[0]