Sources Contact Advanced Search Tutorials

An Interest In:

Web News this Week

Search Archive

Some of Our Sources

View All Sources

Help Webnuz

Referal links:

February 22, 2022 05:48 am GMT

Golang Profiling

Profiling is a form of analyzing the program for optimizable code or functions. In software engineering, it is an essential task since optimization is a key factor when developing an application.
Avoiding memory leaks and optimizing for better performance is almost always a target for enterprise-level software.

Profiling is an important task that cannot be avoided for larger applications. Profiling helps us understand CPU and memory intensive code and helps us write better code for optimization

To create any profile first we need to have a test file. Here we are going to use the Fibonacci function to see profiles of it

// main.gopackage mainfunc Fib2(n int) uint64 {    if n == 0 {        return 0    } else if n == 1 {        return 1    } else {        return Fib2(n-1) + Fib2(n-2)    }}func main() {    // fmt.Println(Fib2(30)) // 832040}

Now, the test file is:

// main_test.gopackage mainimport "testing"func TestGetVal(t *testing.T) {    for i := 0; i < 1000; i++ {             // running it a 1000 times        if Fib2(30) != 832040 {            t.Error("Incorrect!")        }    }}

Now when we run the go test we got the below output

output:go testPassOk

It took almost 7.25s to complete. Now lets create a CPU profile. We will use this command shown below to generate a profile file.

go test -cpuprofile cpu.prof -bench .

which will return the below output

PS C:\work\latest\go-tutorial\profile> go test -cpuprofile cpu.prof -bench .PASSok      profile 8.052s

Now, we will view it using the pprof tool. The command will be:

go tool pprof cpu.prof

When we run the above commands we got the below output

PS C:\work\latest\go-tutorial\profile> go tool pprof cpu.profType: cpuTime: Feb 22, 2022 at 10:53am (IST)Duration: 7.64s, Total samples = 4.86s (63.60%)Entering interactive mode (type "help" for commands, "o" for options")

Typing help will show all commands available. We will run the following command

top5 -cum

The topN function shown top N entries and the -cum flag shows the cumulative time taken

(pprof) top5 -cumShowing nodes accounting for 4700ms, 96.71% of 4860ms totalDropped 33 nodes (cum <= 24.30ms)Showing top 5 nodes out of 15      flat  flat%   sum%        cum   cum%    4700ms 96.71% 96.71%     4700ms 96.71%  profile.Fib2         0     0% 96.71%     4700ms 96.71%  profile.TestGetVal         0     0% 96.71%     4700ms 96.71%  testing.tRunner         0     0% 96.71%       90ms  1.85%  runtime.mcall         0     0% 96.71%       90ms  1.85%  runtime.park_m

based on the above results we will optimize our code.

To create a memory profile we simply use this command:

go test -memprofile mem.prof -bench .

which will return the below output

PS C:\work\latest\go-tutorial\profile> go test -memprofile mem.prof -bench .PASSok      profile 0.644s

We can generate both profiles (main, test) using the following command

go test -cpuprofile cpu.prof -memprofile mem.prof -bench .

which will return the below output

PS C:\work\latest\go-tutorial\profile> go test -cpuprofile cpu.prof -memprofile mem.prof -bench .PASSok      profile 0.655s

Original Link: https://dev.to/krpmuruga/-golang-profiling-3j

Share this article:

View Full Article

Dev To

An online community for sharing and discovering great ideas, having debates, and making friends

More About this Source Visit Dev To