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39 lines
729 B
Markdown
39 lines
729 B
Markdown
# Timing Functions
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When optimizing code, sometimes a quick and dirty time measurement is required
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as opposed to utilizing profiler tools/frameworks to validate assumptions.
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Time measurements can be performed by utilizing `time` package and `defer` statements.
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## Implementation
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```go
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package profile
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import (
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"time"
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"log"
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)
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func Duration(invocation time.Time, name string) {
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elapsed := time.Since(invocation)
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log.Printf("%s lasted %s", name, elapsed)
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}
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```
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## Usage
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```go
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func IntFactorial(x big.Int) *big.Int {
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defer profile.Duration(time.Now(), "IntFactorial")
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y := big.NewInt(1)
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for one := big.NewInt(1); x.Sign() > 0; x.Sub(x, one) {
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y.Mul(y, x)
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}
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return x.Set(y)
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}
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```
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