Benchmark: test unpacking - MeasureThat.net

Script Preparation code:

ths = {}
ths.state = {a:1,b:2,c:3}

Tests:

unpacking1
var _s=ths.state, a=_s.a;
real1
var a = ths.state.a
unpacking2
var _s=ths.state, a=_s.a, b=_s.b
real2
var a = ths.state.a, b = ths.state.b
unpacking3
var _s=ths.state, a=_s.a, b=_s.b, c=_s.c
real3
var a = ths.state.a, b = ths.state.b, c = ths.state.c

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
unpacking1
real1
unpacking2
real2
unpacking3
real3

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared, and their pros/cons.

**Benchmark Definition**
The benchmark is defined by a JSON object that contains the following properties:

* `Name`: The name of the benchmark ("test unpacking")
* `Description`: An empty string (no description provided)
* `Script Preparation Code`: A JavaScript code snippet that creates an object (`ths`) with a nested property (`state`) containing three values: `a=1`, `b=2`, and `c=3`. This script is executed before each test.
* `Html Preparation Code`: An empty string (no HTML prepared)

**Individual Test Cases**
The benchmark consists of six test cases, each defined by another JSON object with the following properties:

* `Benchmark Definition`: A JavaScript code snippet that performs a specific operation on the `ths` object created in the Script Preparation Code.
* `Test Name`: The name of the test case (e.g., "unpacking1", "real1")

Here's a brief description of each test case:

1. `_unpacking1`: Assigns the value of `a` from `ths.state` to a new variable `_s`, but doesn't use it.
2. `real1`: Directly accesses the value of `a` from `ths.state`.
3. `unpacking2`: Assigns both `a` and `b` values from `ths.state` to two separate variables, but only uses `a`.
4. `real2`: Directly accesses both `a` and `b` values from `ths.state`, but doesn't use the value of `c`.
5. `unpacking3`: Assigns all three values (`a`, `b`, and `c`) from `ths.state` to two separate variables, but only uses `a`.
6. `real3`: Directly accesses both `a` and `b` values from `ths.state`, without using the value of `c`.

**Comparison**
The benchmark compares the performance of different approaches:

* **Direct Access**: Testing direct access to properties (`real1`, `real2`, and `real3`) versus
* **Indirect Assignment**: Testing indirect assignment of values to variables using the `_s` variable (`unpacking1`, `unpacking2`, and `unpacking3`)

**Pros/Cons**

* **Direct Access**:
	+ Pros: Typically faster, since it avoids the overhead of creating a new variable.
	+ Cons: May lead to performance regression if the code relies on the indirect assignment approach.
* **Indirect Assignment**:
	+ Pros: Can be useful when the value is needed in multiple parts of the codebase or when using a temporary variable is necessary for other reasons.
	+ Cons: Typically slower, since it involves creating a new variable and assigning values to it.

**Other Considerations**

* The use of `_s` as an intermediate variable might be considered as a form of "temporal coupling" which can impact performance in some cases.
* The benchmark doesn't account for other factors that could affect performance, such as cache locality, branch prediction, or instruction-level parallelism.

**Alternatives**
If you're interested in exploring alternative approaches or optimizations, consider the following:

* Using a more efficient data structure or array representation, like an object with numeric properties.
* Optimizing the Script Preparation Code to reduce overhead or improve cache performance.
* Implementing a custom benchmarking framework that accounts for specific hardware or software characteristics.

Related benchmarks:

test unpacking (version: 2)

Comparing performance of: unpacking1 vs real1 vs unpacking2 vs real2 vs unpacking3 vs real3

Created: 5 years ago by: Registered User

Jump to the latest result

unpacking1

real1

unpacking2

real2

unpacking3

real3

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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