119 lines
5.8 KiB
Markdown
119 lines
5.8 KiB
Markdown
# GoRelic
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New Relic agent for Go runtime. It collect a lot of metrics about scheduler, garbage collector and memory allocator and
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send them to NewRelic.
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### Requirements
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- Go 1.1 or higher
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- github.com/yvasiyarov/gorelic
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- github.com/yvasiyarov/newrelic_platform_go
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- github.com/yvasiyarov/go-metrics
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You have to install manually only first two dependencies. All other dependencies will be installed automatically
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by Go toolchain.
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### Installation
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```bash
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go get github.com/yvasiyarov/gorelic
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```
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and add to the initialization part of your application following code:
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```go
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import (
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"github.com/yvasiyarov/gorelic"
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)
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....
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agent := gorelic.NewAgent()
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agent.Verbose = true
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agent.NewrelicLicense = "YOUR NEWRELIC LICENSE KEY THERE"
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agent.Run()
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```
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### Middleware
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If you using Beego, Martini, Revel or Gin framework you can hook up gorelic with your application by using the following middleware:
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- https://github.com/yvasiyarov/beego_gorelic
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- https://github.com/yvasiyarov/martini_gorelic
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- https://github.com/yvasiyarov/gocraft_gorelic
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- http://wiki.colar.net/revel_newelic
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- https://github.com/jingweno/negroni-gorelic
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- https://github.com/brandfolder/gin-gorelic
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### Configuration
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- NewrelicLicense - its the only mandatory setting of this agent.
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- NewrelicName - component name in NewRelic dashboard. Default value: "Go daemon"
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- NewrelicPollInterval - how often metrics will be sent to NewRelic. Default value: 60 seconds
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- Verbose - print some usefull for debugging information. Default value: false
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- CollectGcStat - should agent collect garbage collector statistic or not. Default value: true
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- CollectHTTPStat - should agent collect HTTP metrics. Default value: false
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- CollectMemoryStat - should agent collect memory allocator statistic or not. Default value: true
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- GCPollInterval - how often should GC statistic collected. Default value: 10 seconds. It has performance impact. For more information, please, see metrics documentation.
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- MemoryAllocatorPollInterval - how often should memory allocator statistic collected. Default value: 60 seconds. It has performance impact. For more information, please, read metrics documentation.
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## Metrics reported by plugin
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This agent use functions exposed by runtime or runtime/debug packages to collect most important information about Go runtime.
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### General metrics
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- Runtime/General/NOGoroutines - number of runned go routines, as it reported by NumGoroutine() from runtime package
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- Runtime/General/NOCgoCalls - number of runned cgo calls, as it reported by NumCgoCall() from runtime package
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### Garbage collector metrics
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- Runtime/GC/NumberOfGCCalls - Nuber of GC calls, as it reported by ReadGCStats() from runtime/debug
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- Runtime/GC/PauseTotalTime - Total pause time diring GC calls, as it reported by ReadGCStats() from runtime/debug (in nanoseconds)
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- Runtime/GC/GCTime/Max - max GC time
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- Runtime/GC/GCTime/Min - min GC time
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- Runtime/GC/GCTime/Mean - GC mean time
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- Runtime/GC/GCTime/Percentile95 - 95% percentile of GC time
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All this metrics are measured in nanoseconds. Last 4 of them can be inaccurate if GC called more often then once in GCPollInterval.
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If in your workload GC is called more often - you can consider decreasing value of GCPollInterval.
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But be carefull, ReadGCStats() blocks mheap, so its not good idea to set GCPollInterval to very low values.
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### Memory allocator
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- Component/Runtime/Memory/SysMem/Total - number of bytes/minute allocated from OS totally.
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- Component/Runtime/Memory/SysMem/Stack - number of bytes/minute allocated from OS for stacks.
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- Component/Runtime/Memory/SysMem/MSpan - number of bytes/minute allocated from OS for internal MSpan structs.
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- Component/Runtime/Memory/SysMem/MCache - number of bytes/minute allocated from OS for internal MCache structs.
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- Component/Runtime/Memory/SysMem/Heap - number of bytes/minute allocated from OS for heap.
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- Component/Runtime/Memory/SysMem/BuckHash - number of bytes/minute allocated from OS for internal BuckHash structs.
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- Component/Runtime/Memory/Operations/NoFrees - number of memory frees per minute
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- Component/Runtime/Memory/Operations/NoMallocs - number of memory allocations per minute
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- Component/Runtime/Memory/Operations/NoPointerLookups - number of pointer lookups per minute
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- Component/Runtime/Memory/InUse/Total - total amount of memory in use
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- Component/Runtime/Memory/InUse/Heap - amount of memory in use for heap
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- Component/Runtime/Memory/InUse/MCacheInuse - amount of memory in use for MCache internal structures
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- Component/Runtime/Memory/InUse/MSpanInuse - amount of memory in use for MSpan internal structures
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- Component/Runtime/Memory/InUse/Stack - amount of memory in use for stacks
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### Process metrics
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- Component/Runtime/System/Threads - number of OS threads used
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- Runtime/System/FDSize - number of file descriptors, used by process
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- Runtime/System/Memory/VmPeakSize - VM max size
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- Runtime/System/Memory/VmCurrent - VM current size
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- Runtime/System/Memory/RssPeak - max size of resident memory set
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- Runtime/System/Memory/RssCurrent - current size of resident memory set
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All this metrics collected once in MemoryAllocatorPollInterval. In order to collect this statistic agent use ReadMemStats() routine.
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This routine calls stoptheworld() internally and it block everything. So, please, consider this when you change MemoryAllocatorPollInterval value.
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### HTTP metrics
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- throughput (requests per second), calculated for last minute
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- mean throughput (requests per second)
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- mean response time
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- min response time
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- max response time
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- 75%, 90%, 95% percentiles for response time
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In order to collect HTTP metrics, handler functions must be wrapped using WrapHTTPHandlerFunc:
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```go
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http.HandleFunc("/", agent.WrapHTTPHandlerFunc(handler))
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```
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## TODO
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- Collect per-size allocation statistic
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- Collect user defined metrics
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