How does Sidekiq differ from other background job processors like Resque or DelayedJob?

beginner

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Sidekiq differs in several key ways:

Concurrency Model: Sidekiq uses threads (lightweight), while Resque uses processes (heavyweight). DelayedJob can use either.
Performance: Sidekiq is typically 20x faster than Resque due to threading
Storage: Sidekiq and Resque use Redis, DelayedJob uses your application's database
Memory Usage: Sidekiq uses less memory due to threading vs forking
Dependencies: Sidekiq requires Redis, DelayedJob requires only a database

Example performance difference:

# Sidekiq can process 1000s of jobs/second with one process
# Resque might need 20+ processes for similar throughput

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