Benchmark: Access object att vs create ref

Script Preparation code:

var arr = [];

for(i=0; i<100; i++){
	arr.push({index:i,val:i+3});
}

Tests:

access Obj
for(i=0; i<100; i++){ let res1=arr[i].val*arr[i].index; }
ref
for(i=0; i<100; i++){ let aux=arr[i]; let res1=aux.val*aux.index; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
access Obj
ref

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser/OS: Chrome 110 on Windows

View result in a separate tab

Test name	Executions per second
access Obj	70120.8 Ops/sec
ref	144421.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

I'd be happy to help you understand what's being tested in this benchmark.

**Benchmark Overview**

The benchmark is designed to measure the performance difference between two approaches: accessing an object directly and using a reference (or alias) to access it. The test creates an array of objects with an "index" property and a "val" property, and then performs arithmetic operations on these properties.

**Options Compared**

There are two options being compared:

1. **Accessing the object directly**: This approach uses the dot notation (`arr[i].val` and `arr[i].index`) to access the properties of the objects in the array.
2. **Using a reference (or alias)**: This approach creates an additional variable `aux` that holds a reference to the current object in the array, and then uses this reference to access its properties (`aux.val` and `aux.index`).

**Pros and Cons**

Here are some pros and cons of each approach:

* **Direct Access**:
	+ Pros: Simple, intuitive, and easy to understand.
	+ Cons: May involve more overhead due to the need to look up the property names, which can lead to slower performance.
* **Reference-based Access**:
	+ Pros: Can be faster since it avoids the lookup overhead, as the reference is already known and stored in memory.
	+ Cons: Requires an additional variable, which can add to the memory usage and complexity.

**Library and Special JS Features**

There doesn't seem to be any specific libraries or special JavaScript features being used in this benchmark. However, it's worth noting that the use of `let` and `const` declarations is modern JavaScript syntax, introduced in ECMAScript 2015 (ES6).

**Other Considerations**

Some other considerations that might affect the performance of these benchmarks include:

* **Cache locality**: The direct access approach may have better cache locality since it accesses adjacent elements in memory.
* **Branch prediction**: The reference-based approach may be faster due to better branch prediction, as the compiler can predict which branch will be taken (in this case, the one with the `aux` variable).
* **Memory allocation and deallocation**: The creation of the additional `aux` variable may involve some overhead in terms of memory allocation and deallocation.

**Alternative Benchmarking Approaches**

Other alternative benchmarking approaches that could be used to measure performance differences between accessing an object directly and using a reference include:

* Using different data structures, such as arrays vs. objects or linked lists.
* Adding more complex operations, such as nested loops or recursive functions.
* Measuring the impact of different memory allocation strategies, such as caching or pre-allocating memory.

I hope this explanation helps! Let me know if you have any further questions.

Related benchmarks:

Access object att vs create ref (version: 0)

Comparing performance of: access Obj vs ref

Created: one year ago by: Registered User

Jump to the latest result

access Obj

ref

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):