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They live in the middle of the testing pyramid.",[],{"link_type":469},"Any","Image",{"dimensions":472,"alt":13,"copyright":13,"url":475,"id":476,"edit":477},{"width":473,"height":474},760,620,"\u002F_prismic-media\u002Fa6157a146d690db1-6imSffqDxNhZEvJw_9616f291-7a0f-48c5-8383-0a22e32.png","6imSffqDxNhZEvJw",{"x":17,"y":17,"zoom":18,"background":19},{"link_type":479},"Media",{},{},{},"Contact (default)",{"link_type":485},"Document","Light","None","Solid color (no gradient)","Right","Top of section","content_block$3505e6c3-50de-42a3-9ef7-92048c58b217","content_block",{"variation":428,"version":429,"items":494,"primary":495,"id":503,"slice_type":458,"slice_label":13},[],{"body":496},[497,500],{"type":418,"text":498,"spans":499},"Before performance testing, it’s important to determine your system’s business goals, so you can tell if your system behaves satisfactorily or not according to your customer needs. 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Let's have a look at each of them.",[547,553],{"start":548,"end":549,"type":550,"data":551},89,102,"hyperlink",{"link_type":422,"url":552,"target":425},"https:\u002F\u002Fjmeter.apache.org\u002Findex.html",{"start":554,"end":555,"type":550,"data":556},107,117,{"link_type":422,"url":557,"target":425},"https:\u002F\u002Fk6.io\u002F",{"type":418,"text":559,"spans":560,"direction":456},"Apache JMeter",[561],{"start":17,"end":562,"type":563},13,"strong",{"type":418,"text":565,"spans":566,"direction":456},"JMeter is a popular, open source Java testing tool. It allows us to configure tests using a recording GUI and predefined templates. We can use long polling or another request to check whether an asynchronous operation is completed.",[567],{"start":568,"end":569,"type":550,"data":570},92,130,{"link_type":422,"url":571,"target":425},"https:\u002F\u002Fjmeter.apache.org\u002Fusermanual\u002Fjmeter_proxy_step_by_step.html",{"type":418,"text":573,"spans":574,"direction":456},"JMeter provides thread groups and a ramp up period in seconds load testing distributed systems.",[575],{"start":576,"end":577,"type":550,"data":578},62,94,{"link_type":422,"url":579,"target":425},"https:\u002F\u002Fjmeter.apache.org\u002Fusermanual\u002Fjmeter_distributed_testing_step_by_step.html",{"type":418,"text":581,"spans":582,"direction":456},"Grafana K6",[583],{"start":17,"end":584,"type":563},10,{"type":418,"text":586,"spans":587,"direction":456},"K6 is another popular load testing tool. It is an open source Go project. Tests are configured using a scripting language similar to JavaScript.",[588],{"start":589,"end":590,"type":550,"data":591},103,121,{"link_type":422,"url":592,"target":425},"https:\u002F\u002Fk6.io\u002Fdocs\u002Fgetting-started\u002Frunning-k6\u002F",{"type":418,"text":594,"spans":595,"direction":456},"K6 does not provide support for promises or async execution, but we can achieve async testing support using virtual users.",[596,601],{"start":597,"end":598,"type":550,"data":599},32,59,{"link_type":422,"url":600,"target":425},"https:\u002F\u002Fgithub.com\u002Fgrafana\u002Fk6#script-execution",{"start":602,"end":590,"type":550,"data":603},108,{"link_type":422,"url":604,"target":425},"https:\u002F\u002Fk6.io\u002Fdocs\u002Fgetting-started\u002Frunning-k6\u002F#adding-more-vus",{"type":418,"text":606,"spans":607,"direction":456},"Load for the test is configured using scenarios in an options object, which states how many requests to run for each stage of the test. This allows us to configure linear and step ramp up.",[608],{"start":609,"end":610,"type":550,"data":611},38,68,{"link_type":422,"url":612,"target":425},"https:\u002F\u002Fk6.io\u002Fdocs\u002Fusing-k6\u002Foptions\u002F#scenarios","rich_text$21347ff9-a088-4989-b55a-c7a2d1df8cdd",{"variation":428,"version":429,"items":615,"primary":616,"id":637,"slice_type":458,"slice_label":13},[],{"body":617},[618,621,624,627,631,634],{"type":453,"text":619,"spans":620,"direction":456},"Our ideal load testing tool",[],{"type":418,"text":622,"spans":623,"direction":456},"At Form3, we invest a lot of engineering time into performance testing our platform. We initially used k6 to develop and run these tests, but it did not fully fit our ideal load testing tool.",[],{"type":418,"text":625,"spans":626,"direction":456},"Our ideal tool should allow us to:",[],{"type":628,"text":629,"spans":630,"direction":456},"o-list-item","Easily write asynchronous tests, which integrate with our queues and services. This was not always easy to do in Javascript.",[],{"type":628,"text":632,"spans":633,"direction":456},"A allow our engineers to write tests in Go, which is what they’re most comfortable in.",[],{"type":628,"text":635,"spans":636,"direction":456},"Run different modes of load. As our platform operates under huge amounts of load, we want to be able to configure different kinds of load.",[],"rich_text$e989b475-a645-499f-9599-5adbe6e3f69d",{"variation":428,"version":429,"items":639,"primary":640,"id":653,"slice_type":458,"slice_label":13},[],{"body":641},[642,645],{"type":453,"text":643,"spans":644,"direction":456},"F1 example",[],{"type":418,"text":646,"spans":647,"direction":456},"The existing solutions did not provide us any of our ideal load testing tool features, so this is why we decided to write our own solution and then open source it for the community to use. You can find it under form3tech-oss\u002Ff1.",[648],{"start":649,"end":650,"type":550,"data":651},211,227,{"link_type":422,"url":652,"target":425},"https:\u002F\u002Fgithub.com\u002Fform3tech-oss\u002Ff1","rich_text$46d99ee3-aca0-4574-8f4b-b09a40d7a87a",{"variation":428,"version":460,"items":655,"primary":656,"id":692,"slice_type":492,"slice_label":13},[],{"eyebrow":13,"heading":657,"body":658,"cta_label":13,"cta_link":679,"aside_type":470,"aside_image":680,"aside_video":687,"aside_video_poster":688,"aside_video_reduced_motion":689,"aside_video_url":13,"aside_embed":690,"pardot_form_url":13,"form_submit_label":13,"form_variant":483,"form_heading":13,"redirect_on_success":691,"theme":486,"overlay_pattern":487,"background_continuation":488,"media_position":489,"aside_vertical_align":490},[],[659,667],{"type":418,"text":660,"spans":661,"direction":456},"We have also created a demonstration\u002Ftutorial repository under form3tech-oss\u002Ff1-example. We will briefly discuss this example in this blogpost.",[662],{"start":663,"end":664,"type":550,"data":665},63,87,{"link_type":422,"url":666,"target":425},"https:\u002F\u002Fgithub.com\u002Fform3tech-oss\u002Ff1-example",{"type":418,"text":668,"spans":669,"direction":456},"The example docker-compose.yml sets up a simple service which uses goaws local SQS mock. This is the environment we will be running tests on.",[670,675],{"start":671,"end":672,"type":550,"data":673},12,30,{"link_type":422,"url":674,"target":425},"https:\u002F\u002Fgithub.com\u002Fform3tech-oss\u002Ff1-example\u002Fblob\u002Fmaster\u002Fdocker-compose.yml",{"start":676,"end":664,"type":550,"data":677},67,{"link_type":422,"url":678,"target":425},"https:\u002F\u002Fgithub.com\u002Fp4tin\u002Fgoaws",{"link_type":469},{"dimensions":681,"alt":13,"copyright":13,"url":684,"id":685,"edit":686},{"width":682,"height":683},980,780,"\u002F_prismic-media\u002F8820eb49bea28d83--Ydeo3sC9rPI4HhS_a0ca2537-3e36-4595-9c65-32d2a16.png","-Ydeo3sC9rPI4HhS",{"x":17,"y":17,"zoom":18,"background":19},{"link_type":479},{},{},{},{"link_type":485},"content_block$7216a00c-3590-4651-aa02-90b9e7877e7f",{"variation":428,"version":429,"items":694,"primary":695,"id":703,"slice_type":458,"slice_label":13},[],{"body":696},[697,700],{"type":453,"text":698,"spans":699,"direction":456},"Writing tests",[],{"type":418,"text":701,"spans":702,"direction":456},"Writing tests using f1 is easy - you need to import the library and declare it in the main() function of a new command. The f .Add method registers a new scenario to be run with f1.",[],"rich_text$ddf7af68-830c-4090-b4aa-150320c90bb1",{"variation":428,"version":429,"items":705,"primary":706,"id":713,"slice_type":714,"slice_label":13},[],{"language_label":707,"code":708},"go",[709],{"type":710,"text":711,"spans":712},"preformatted","import (\n\t\"net\u002Fhttp\"\n\t\"time\"\n\n\t\"github.com\u002Fform3tech-oss\u002Ff1\u002Fv2\u002Fpkg\u002Ff1\"\n\t\"github.com\u002Fform3tech-oss\u002Ff1\u002Fv2\u002Fpkg\u002Ff1\u002Ftesting\"\n)\n\nfunc main() {\n\tf := f1.New()\n\tf.Add(\"testScenario\", testScenario)\n\tf.Execute()\n}",[],"code_block$802e1e35-97b2-4671-ac39-b6c843b7569f","code_block",{"variation":428,"version":429,"items":716,"primary":717,"id":726,"slice_type":458,"slice_label":13},[],{"body":718},[719],{"type":418,"text":720,"spans":721},"After setting up the SQS client and consuming messages from it, we can configure our run function which will be called by thef1test assertions.",[722],{"start":723,"end":576,"type":550,"data":724},17,{"link_type":422,"url":725,"target":425},"https:\u002F\u002Fgithub.com\u002Fform3tech-oss\u002Ff1-example\u002Fblob\u002Fmaster\u002Fcmd\u002Ff1\u002Fmain.go#L22-L63","rich_text$914d7df4-b2d8-449c-b1b7-44f73c79b0eb",{"variation":428,"version":429,"items":728,"primary":729,"id":734,"slice_type":714,"slice_label":13},[],{"language_label":707,"code":730},[731],{"type":710,"text":732,"spans":733},"runFn := func(t *testing.T) {\n        \u002F\u002F Our test iteration code goes here.\n        res, err := http.Post(\"http:\u002F\u002Flocalhost:8080\u002Fpayments\", \"application\u002Fjson\", nil)\n        t.Require().NoError(err)\n        t.Require().Equal(http.StatusAccepted, res.StatusCode)\n        timer := time.NewTimer(10 * time.Second)\n        for {\n            select {\n            case \u003C-timer.C:\n                t.Require().Fail(\"no message received after timeout\")\n                return\n            case \u003C-messagesChan:\n                t.Logger().Info(\"message received, iteration success\")\n                return\n            }\n        }\n    }",[],"code_block$040f935c-4ed1-498b-8dc4-6f61b3a8a2c9",{"variation":428,"version":429,"items":736,"primary":737,"id":747,"slice_type":458,"slice_label":13},[],{"body":738},[739],{"type":418,"text":740,"spans":741},"You can see the entire test scenario configuration on GitHub",[742],{"start":743,"end":744,"type":550,"data":745},51,60,{"link_type":422,"url":746},"https:\u002F\u002Fgithub.com\u002Fform3tech-oss\u002Ff1-example\u002Fblob\u002Fmaster\u002Fcmd\u002Ff1\u002Fmain.go","rich_text$7b6a8821-f5a4-4a4f-8c48-498bb93f99ae",{"variation":428,"version":429,"items":749,"primary":750,"id":758,"slice_type":458,"slice_label":13},[],{"body":751},[752,755],{"type":453,"text":753,"spans":754,"direction":456},"Running tests",[],{"type":418,"text":756,"spans":757,"direction":456},"Once our test is written we can compile the f1 binary to make it easier to run.",[],"rich_text$afe2018d-e654-4815-a821-a4e9a10cad10",{"variation":428,"version":429,"items":760,"primary":761,"id":766,"slice_type":714,"slice_label":13},[],{"language_label":13,"code":762},[763],{"type":710,"text":764,"spans":765},"go build -o f1 .\u002Fcmd\u002Ff1\u002Fmain.go",[],"code_block$074097f5-0983-44a5-8e7a-0871e90e1189",{"variation":428,"version":429,"items":768,"primary":769,"id":774,"slice_type":458,"slice_label":13},[],{"body":770},[771],{"type":418,"text":772,"spans":773},"Then, it's time to start up the example test environment consisting of our payments service and the mock SQS queue.",[],"rich_text$f75c67a7-cca0-4fad-845b-663aa9e9e394",{"variation":428,"version":429,"items":776,"primary":777,"id":782,"slice_type":714,"slice_label":13},[],{"language_label":13,"code":778},[779],{"type":710,"text":780,"spans":781},"docker-compose up -d",[],"code_block$327b400b-9fab-4820-93d1-f4d222aea069",{"variation":428,"version":429,"items":784,"primary":785,"id":790,"slice_type":458,"slice_label":13},[],{"body":786},[787],{"type":418,"text":788,"spans":789},"Finally, the configured scenario is easily run using the f1 CLI. This command will run the test at a constant rate for 10 seconds.",[],"rich_text$803fd30d-cdb9-42ef-b312-ed56e02f6ac4",{"variation":428,"version":429,"items":792,"primary":793,"id":798,"slice_type":714,"slice_label":13},[],{"language_label":13,"code":794},[795],{"type":710,"text":796,"spans":797},".\u002Ff1 run constant testScenario -r 1\u002Fs -d 10s",[],"code_block$3282190b-db5d-4961-9d58-d4f84085033a",{"variation":428,"version":460,"items":800,"primary":801,"id":820,"slice_type":492,"slice_label":13},[],{"eyebrow":13,"heading":802,"body":803,"cta_label":13,"cta_link":807,"aside_type":470,"aside_image":808,"aside_video":815,"aside_video_poster":816,"aside_video_reduced_motion":817,"aside_video_url":13,"aside_embed":818,"pardot_form_url":13,"form_submit_label":13,"form_variant":483,"form_heading":13,"redirect_on_success":819,"theme":486,"overlay_pattern":487,"background_continuation":488,"media_position":489,"aside_vertical_align":490},[],[804],{"type":418,"text":805,"spans":806,"direction":456},"The command outputs some basic metrics for the test service.",[],{"link_type":469},{"dimensions":809,"alt":13,"copyright":13,"url":812,"id":813,"edit":814},{"width":810,"height":811},2048,1266,"\u002F_prismic-media\u002Fc8d8beb0d6551d29-wL1jf7sROsw_AAEu_a6603b5b-0e8e-4727-9a4b-7c681ae.png","wL1jf7sROsw_AAEu",{"x":17,"y":17,"zoom":18,"background":19},{"link_type":479},{},{},{},{"link_type":485},"content_block$51f24cf8-64b9-4148-8fa3-8fd52ad65263",{"variation":428,"version":429,"items":822,"primary":823,"id":842,"slice_type":458,"slice_label":13},[],{"body":824},[825,828,831,837],{"type":453,"text":826,"spans":827,"direction":456},"Conclusions",[],{"type":418,"text":829,"spans":830,"direction":456},"Writing our tests in Go has been a huge game changer for our engineers, as it allows us to make use of goroutines and channels for test configuration.",[],{"type":418,"text":832,"spans":833,"direction":456},"f1 is feature complete, we use it every day and you can too. It's freely available on GitHub.",[834],{"start":835,"end":568,"type":550,"data":836},83,{"link_type":422,"url":652,"target":425},{"type":418,"text":838,"spans":839,"direction":456},"Happy load testing!",[840],{"start":17,"end":841,"type":563},19,"rich_text$356d00bd-72c8-4681-bfc0-de29c58fbeec","Due to a lack of functionality in existing solutions, we wrote our own open source load testing tool, F1, at Form3 to test our asynchronous system. This blogpost gives you an introduction to performance testing, a comparison of common testing tools and a short introduction of how to usef1to write your own testing scenarions in Go.",1788466508025]