iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Concurrency is how a program organizes independent tasks so they can make progress during overlapping periods; parallelism is when computations actually run at the same time. One cook switching among dishes illustrates concurrency. Two cooks doing separate work simultaneously illustrate parallelism. A program can be concurrent without being parallel, and adding CPUs helps only when the work and its coordination costs allow useful parallel execution.
What concurrency and parallelism mean
Andrew Gerrand’s Go Blog draws the distinction this way: “In programming, concurrency is the composition of independently executing processes, while parallelism is the simultaneous execution of (possibly related) computations.” (Go Blog, January 16, 2013.)
Concurrency describes the structure of work: separate tasks can progress over overlapping periods. Parallelism describes execution: two or more computations run at the same time. The ideas are related, but they are not interchangeable.
How the kitchen analogy works
One cook: concurrency
Imagine one cook preparing several dishes. The cook starts something that needs time to simmer, moves to another task while it waits, then returns when it is ready. Several tasks are in progress, but the cook is not performing two actions at once. That is concurrency without parallelism.
#1 Best Overall
- Experience intense real-time strategy and negotiation in Rival Restaurants, where each player leads a unique restaurant and competes to become the top chef.
- Choose from 8 distinct restaurants with unique level-up bonuses and 12 powerful chefs, each offering special abilities to shape your culinary dominance.
- Collect ingredients, cook recipes, and score popularity points as you race to earn 20 points first to be crowned “The Wiener” in this dynamic board game.
- Perfect for 2-6 players, Rival Restaurants blends strategy, negotiation, and fast-paced decision-making for hours of competitive cooking fun.
- Combines strategy, asymmetric gameplay, and unique chef powers for endless replayability, making every game a new culinary showdown.
Two cooks: parallelism
Now imagine two cooks doing separate tasks at the same time. That is parallel execution, provided the work and available resources let them proceed independently. The analogy is useful for remembering the difference, but it is not a complete model of how computers schedule work or how tasks compete for resources.
How the distinction applies to programs
The Go documentation describes concurrency as structuring a program around independently executing components, and parallelism as executing calculations in parallel for efficiency on multiple CPUs (Effective Go). A concurrent program may take turns on a single processor; its tasks can still be structured to make progress independently even though they are not running simultaneously.
Rank #2
- Craft a mouthwatering appetizer display as you draft cured meats, cheeses, fruits, and flavorful extras, carefully arranging each tile to build the most visually appealing charcuterie board.
- Strategic tile placement challenges you to maximize points through clever spatial planning, synergistic combinations, and thoughtful positioning that enhances your board’s final presentation.
- Score additional points by meeting unique social criteria that reward creativity, balance, and thematic arrangements, turning each board into a crowd-pleasing culinary masterpiece.
- Ideal for families, food lovers, and casual gamers, offering intuitive rules, satisfying choices, and fast-paced drafting rounds that keep every session engaging and replayable.
- Beautiful components, colorful food tiles, and an accessible yet strategic design make this the perfect game for entertaining, inspiring creativity, and sparking friendly competition.
Parallelism requires both execution capacity and work that can use it. Multiple CPUs cannot make intrinsically sequential work happen at once. Dependencies may require one step to finish before another can begin.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Why more CPUs may not make a program faster
More execution resources help only if the problem can be divided into computations that can run independently. Even then, the work of coordinating and communicating between those computations consumes resources. If that overhead outweighs the useful work done concurrently, using multiple operating-system threads can make a program slower rather than faster.
Rank #3
- It's restaurant week at Bistro Bay - challenges are set for restaurants to meet, and a Critic will be coming to determine who is the greatest competing restaurateur!
- Race to get ingredients before other players - each chef can carry a different amount!
- Medium to low weight strategy game (a beginner could follow with focus)
- Adorable art by Sandara Tang (Flamecraft)
- Recommended for 1-5 players, ages 12 and up - gameplay is approximately 60 minutes
The Go FAQ addresses the question “Why doesn’t my program run faster with more CPUs?” Its practical answer is to consider whether the problem is intrinsically parallel and whether synchronization or communication costs are small enough for parallel execution to help (Go FAQ). The number of CPUs alone does not establish a speedup.
Quick comparison
| Question | Concurrency | Parallelism |
|---|---|---|
| What does it describe? | How independent tasks are structured and make progress | Whether multiple computations execute simultaneously |
| Must tasks run at the exact same time? | No | Yes |
| Kitchen example | One cook switches among dishes as work waits or becomes ready | Multiple cooks work at once when the work and resources permit |
| What does it depend on? | A design with independently progressing tasks | Execution resources and work that can use them |
| Performance caveat | Organizing work into tasks does not guarantee a speedup | Dependencies, synchronization, and communication can limit or erase gains |
What this means for Go
Go offers concurrency primitives, but using goroutines or another concurrent structure does not by itself show that useful computations are executing in parallel. Concurrency can enable parallelism when the problem can be divided appropriately; whether that improves performance depends on the workload and the cost of coordination.
Quick Recap
Best Value
- Cooking Fun for All Ages: Recipe Rush brings the kitchen to the table! Kids become little chefs as they match, cook, and race through playful challenges full of fun and discovery.
- Learn & Play for Toddlers & Preschoolers (18 Months to 5 Years): No reading required! Easy visual matching gameplay helps little ones build focus, language, and visual recognition skills through fun pretend kitchen play.
- Fast-Paced Strategy for Older Kids (6+ years): Older kids dive into recipe races with action cards that flip dishes, swap menus, and stir up kitchen chaos. Fast, funny, and great for building observation, flexible thinking, and strategy.
- Perfect for Little Hands and Minds: Thick, sturdy cards feature vibrant food illustrations and our lovable Squirrel Chef. The easy-to-grip size is perfect for little hands and helps develop fine motor skills.
- Quick & Focused Play: 15-minute sessions keep kids engaged and help build focus. Play solo for independent learning or with up to 4 players for social, cooperative fun.
Rank #4
- Orchard Toys' best-selling, fun cooking game "Crazy Chefs" is back with new ingredients and meals
- "Crazy Chefs" is a fun food-themed matching game!
- "Crazy Chefs" teaches children about different foods and healthy eating.
- Kids will love helping chefs gather ingredients and utensils in the vibrant, food-themed matching game "Crazy Chefs".
- For ages 3-6 and for 2-4 players.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Recommended Free Tools
