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Preinitialized array size vs Push operations to an empty one.
(version: 1)
Comparing performance of:
Preinitialized size - large difference vs Push vs Preinitialized size - small difference vs Preinitilized size - no difference
Created:
7 years ago
by:
Registered User
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Tests:
Preinitialized size - large difference
let arr = new Array(100000) for (var i=0; i<1000; i++) { arr[i] = Math.random; } arr = arr.slice(0, 1000)
Push
let arr =[] for (var i=0; i<1000; i++) { arr.push(Math.random); }
Preinitialized size - small difference
let arr = new Array(1200) for (var i=0; i<1000; i++) { arr[i] = Math.random; } arr = arr.slice(0, 1000)
Preinitilized size - no difference
let arr = new Array(1000) for (var i=0; i<1000; i++) { arr[i] = Math.random; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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Test case name
Result
Preinitialized size - large difference
Push
Preinitialized size - small difference
Preinitilized size - no difference
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark measures the performance of two approaches: preinitializing an array with a specific size and using the `push` method to add elements to an empty array. **Preinitialized Array Size vs Push Operations** The tests compare the execution time of two scenarios: 1. **Preinitialized size - large difference**: The array is initialized with 100,000 elements and then sliced to keep only the first 1,000 elements. This creates a significant amount of unnecessary work. 2. **Push**: The array starts empty and uses `push` to add 1,000 random elements to it. 3. **Preinitialized size - small difference**: Similar to the previous test, but the array is initialized with 12,000 elements instead of 100,000. 4. **Preinitialized size - no difference**: The array is initialized with 1,000 elements and then sliced to keep only the first 1,000 elements. **Options Compared** The two main options being compared are: * Preinitializing an array with a specific size * Using `push` method to add elements to an empty array **Pros and Cons of Each Approach** **Preinitialized Array Size:** Pros: * Can lead to better cache locality, as the entire array is initialized at once. * May reduce the number of allocations required. Cons: * Creates unnecessary work if only a subset of elements is needed (as in the "large difference" test). * May require more memory upfront. **Push Method:** Pros: * Only creates elements as needed, reducing unnecessary work. * Flexibility to add or remove elements dynamically. Cons: * Can lead to slower execution times due to the overhead of creating and manipulating arrays. * Requires more memory allocations over time. **Library Used** None mentioned in the provided benchmark definition. However, some libraries might be used for parsing the HTML preparation code or executing the test cases (e.g., JavaScript engines like V8). **Special JS Features or Syntax** No special features or syntax are mentioned in the benchmark definition. If there were any, they would likely be related to performance optimization techniques. **Other Alternatives** To measure similar performance characteristics, you might consider using other methods: * Using a different data structure, such as an array-like object or a linked list. * Implementing a custom allocator for arrays. * Using parallel processing or multi-threading to execute the tests in multiple threads. Keep in mind that these alternatives would likely have significant changes to the benchmark code and might not produce comparable results.
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