Say it like this
- We need better concurrency handling in the API.
- The system lacks proper concurrency control.
- Concurrency issues caused the race condition.
Use it at work
Debugging
- This bug only shows up under concurrency.
- Two requests update the same row. It's a concurrency issue.
Design
- How does this handle concurrency?
- Let's limit concurrency to 10 workers.
Interviews
- Can you explain concurrency vs parallelism?
- I fixed a concurrency bug with a database lock.
Don't say this
Concurrency is a property of the system design, not something you have more or less of; you improve how you manage it.
Don't mix it up
| Term | What it is | Who writes or uses it | When |
|---|---|---|---|
| concurrency | Handling many tasks at overlapping times | Developers | Servers, async code |
| parallelism | Running tasks at the exact same time | Developers | Multi-core work |
Practice
Try it
4 quick exercises
1. Your team needs to fix problems with multiple database updates happening at once. Which phrasing is most professional?
2. The microservices architecture improved _______ by allowing multiple requests to be processed independently.
3. Which sentence uses concurrency correctly?
4. Rewrite in natural tech English: 'Our server can do many things at the same time without waiting for each one to finish.'
Say it out loud
Phrase 1 of 3
"We need better concurrency handling in the API."
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More about concurrency
Real examples(3)
- in a standup
"We discovered a concurrency bug where two threads were updating the same database record simultaneously."
- in a code review
"This implementation improves concurrency by using message queues instead of shared memory."
- in a team meeting
"Our node server handles high concurrency through async-await patterns rather than traditional threading."
More mistakes(2)
Handle with care. Do not confuse concurrency with parallelism. Concurrency means tasks can progress independently, while parallelism means tasks execute at exactly the same time on multiple processors.
- ✕Concurrency and parallelism are the same thing.✓Concurrency and parallelism are related but different concepts.
Concurrency allows multiple tasks to progress; parallelism means they execute at the exact same moment on different cores.
- ✕We concurrency the code.✓We implemented concurrency in the code.
Concurrency is a noun; you do not use it as a verb directly.
Other forms(3)
- concurrency noun
"The system handles concurrency through thread pools."
- concurrent adjective
"We are running concurrent processes on multiple servers."
- concurrently adverb
"Multiple requests are processed concurrently by the application."
Often used with(5)
- handle concurrency · To manage multiple simultaneous operations in a system.
- concurrency control · Mechanisms to ensure safe concurrent access to shared resources.
- concurrency issue / bug · Problems that arise from improper handling of concurrent operations.
- concurrency model · The approach or framework a system uses to manage concurrent tasks.
- improve / optimize concurrency · To make the system better at handling multiple operations efficiently.
Similar words(3)
- parallelism · Related but different: parallelism means simultaneous execution on multiple processors, while concurrency means overlapping progress.
- multitasking · Similar concept in operating systems, but concurrency is more precise in software development contexts.
- asynchronous processing · One technique used to achieve concurrency, but concurrency is the broader concept.
Opposites(2)
- sequential execution
- synchronous processing
Questions(5)
- What is the difference between concurrency and parallelism?
- Concurrency means multiple tasks can progress independently and may appear to execute simultaneously through rapid switching, while parallelism means tasks execute at exactly the same time on different processors. A concurrent system can run on a single-core processor; a parallel system requires multiple cores or processors.
- Why is concurrency important in software development?
- Concurrency is essential for building responsive applications that can handle multiple users simultaneously, making efficient use of system resources, and improving throughput. Without proper concurrency, a server could only serve one client at a time, making it impractical for modern applications.
- What are common concurrency problems?
- Common concurrency problems include race conditions (when multiple threads access shared data unexpectedly), deadlocks (when threads wait indefinitely for each other), and data corruption. These issues require careful synchronization using locks, semaphores, or other concurrency control mechanisms.
- How do you handle concurrency in different programming languages?
- Different languages offer different approaches: Java uses threads and synchronized blocks; Python uses the Global Interpreter Lock (GIL) and asyncio; JavaScript uses promises and async-await; Go uses goroutines and channels. The choice depends on the language design and the specific problem you are solving.
- Is concurrency formal or informal?
- Concurrency is a formal, technical term used in professional software development conversations, documentation, and academic contexts. It is appropriate for team meetings, code reviews, documentation, and technical interviews.
