👀 Views: 369 💬 Answers: 1 📅 Created: 2025-06-07

go csv performance Go

I'm attempting to set up Does anyone know how to I'm experiencing significant performance issues when parsing large CSV files (around 10MB) using Go's built-in `encoding/csv` package. The parsing takes noticeably longer than expected, and I'm trying to figure out whether it's due to the size of the file, the way I'm reading it, or something else. Here's the code I'm currently using to read and process the CSV data: ```go package main import ( "encoding/csv" "fmt" "log" "os" "time" ) func main() { start := time.Now() file, err := os.Open("large_file.csv") if err != nil { log.Fatal(err) } defer file.Close() reader := csv.NewReader(file) records, err := reader.ReadAll() if err != nil { log.Fatal(err) } for _, record := range records { // Simulate some processing fmt.Println(record) } fmt.Printf("Parsing took: %v\n", time.Since(start)) } ``` I've tried optimizing the read operation by using a buffered reader but haven't seen any substantial improvement. Here’s what I did: ```go package main import ( "bufio" "encoding/csv" "fmt" "log" "os" "time" ) func main() { start := time.Now() file, err := os.Open("large_file.csv") if err != nil { log.Fatal(err) } defer file.Close() bufferedReader := bufio.NewReader(file) reader := csv.NewReader(bufferedReader) records, err := reader.ReadAll() if err != nil { log.Fatal(err) } for _, record := range records { fmt.Println(record) } fmt.Printf("Parsing took: %v\n", time.Since(start)) } ``` Even with the buffered reader, the execution takes longer than I would expect for such a straightforward operation. In testing, the log shows parsing takes several seconds, and the console output is quite slow. Is there a better way to optimize the CSV parsing process in Go, or am I missing a more efficient approach? Also, are there any performance limits or considerations I should be aware of while using the `encoding/csv` package? Any insights or tips would be greatly appreciated! This is happening in both development and production on Windows 10. Cheers for any assistance! My development environment is Linux. Any advice would be much appreciated.