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This article mainly introduces the relevant knowledge of "golang performance monitoring case analysis in web project". The editor shows you the operation process through the actual case, and the operation method is simple, fast and practical. I hope this article "golang performance monitoring case analysis in web project" can help you solve the problem.

Performance monitoring 1. Web projects (such as in gin)

1. Use ginpprof

Import "github.com/DeanThompson/ginpprof" router: = gin.Default () ginpprof.Wrap (router)

two。 Use pprof

You just need to introduce: _ "net/http/pprof" into main.go

Visit: 127.0.0.1:8080/debug/pprof

/ debug/pprof/profile: accessing this link will automatically CPU profiling for 30 seconds and generate a file for download / debug/pprof/block:Goroutine blocking events. By default, a sample is taken every time a blocking event occurs. / debug/pprof/goroutines: record the information of the active Goroutine. Sample only once when getting. / debug/pprof/heap: a record of heap memory allocation. By default, it is sampled for every 512K bytes allocated. / debug/pprof/mutex: view the holder of the contention mutex. / debug/pprof/threadcreate: a record of system thread creation. Sample only once when getting. Second, a single go file if you view gc

1. Set environment variabl

Set GODEBUG=gctrace=1

two。 Terminology:

Mark: marking phase.

MarkTermination: marks the end phase.

Mutator assist: auxiliary GC, which means that mutator threads will run concurrently during the GC process, and the mutator assist mechanism will assist GC to do part of the work.

Heaplive: in the memory management of Go, span is the basic unit of memory pages, each page size is 8kb, while Go allocates different pages of span according to the size of the object, and heaplive represents the total size of all span.

Dedicated / fractional / idle: in the marking stage, there are three different mark worker modes, namely dedicated, fractional and idle, which represent different degrees of focus. Among them, dedicated mode is the most focused, which is the complete GC recycling behavior, fractional can only do part of the GC behavior, and idle is the easiest.

P: refers to the processor

3. Meaning

Gc 4 @ 0.254s 5%: 2.0-1.0-9.9 ms clock, 16-1.0-2.0-79 ms cpu, 4-> 4-> 0 MB, 5-MB goal, 8 P

Gc 4: the number of times GC is executed, superimposed each time. The fourth GC.

@ 0.254s: the specific number of seconds since the program was started. At present, it is 0.254s after the program is started.

5%: the percentage of time spent in GC since the program was started. Since its startup, the program has spent 5% of its time on GC.

The percentage of CPU time shared by the marking work of 2.0+1.0+9.9ms clock:GC as a percentage of the total CPU time.

2. 0 represents the STW time of a single P in the mark phase. (stop the world)

1. 0 represents the time spent by all P's mark concurrent (concurrent tags).

9.9 represents the STW time of the markTermination phase of a single P

16: 00, 2. 0, 2. 0. 79 ms cpu

16: indicates the time when the whole process paused in the STW phase of mark.

0 mutator assist 2.0 fractional 0 indicates the time taken by idle, 2.0 represents the time taken by idle + fractional, and 2.0 represents the time taken by idle.

4-> 4-> 0 MB

4 represents the heap_live size before the start of the mark phase.

4 represents the heap_live size before the start of the markTermination phase.

1 represents the size of the marked object.

5 MB goal: indicates that the threshold for triggering GC recycling next time is 5 MB.

8 P: how many Ps are involved in this GC?

Check the configuration of the computer:

Run-- dxdiag

Device Manager

Scvg4: inuse: 111111idle: 54, sys: 187, released: 0, consumed: 198 (MB)

Inuse: 111. How much memory do you use?

Idle: 54 memory left to be cleared

Sys: 187 memory: system-mapped memory

Released: 0J: freed system memory

Consumed: 198: requested system memory

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