Gatling. ConnectException: connection timed out: - scala

Question

I'm new in gatling and now experimenting with Gatling on its website computer-database.gatling.io.
Everything is working fine and i'm going to apply load test for my project at work in few days, but one problem,
I need 2000 users/per second for my website (it seems not a big deal for gatling as I read on other recourses)
I have this simple code: where I want to load 250 users/admins during 300 seconds, and now issues and questions (Please, help me figure this out)
When I've started this script:
package load
import io.gatling.core.Predef._
import io.gatling.http.Predef._
import io.gatling.core.structure.ChainBuilder
import io.gatling.jdbc.Predef.jdbcFeeder
import scala.util.Random
import scala.concurrent.duration._
class TestOvo extends Simulation {
val httpProtocol = http
.baseURL("http://computer-database.gatling.io")
.acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8")
.acceptEncodingHeader("gzip, deflate")
.acceptLanguageHeader("en-US,en;q=0.8")
.userAgentHeader("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36")
val headers_0 = Map("Upgrade-Insecure-Requests" -> "1")
val headers_10 = Map(
"Origin" -> "http://computer-database.gatling.io",
"Upgrade-Insecure-Requests" -> "1")
object Search {
val search = exec(http("request_0")
.get("/")
.headers(headers_0))
.pause(1)
.exec(http("request_1")
.get("/computers?f=macbook")
.headers(headers_0))
.pause(2)
.exec(http("request_2")
.get("/computers/89")
.headers(headers_0))
.pause(2)
.exec(http("request_3")
.get("/")
.headers(headers_0))
.pause(2)
}
object Browse {
val browse = exec(http("request_4")
.get("/computers?p=1")
.headers(headers_0))
.pause(1)
.exec(http("request_5")
.get("/computers?p=2")
.headers(headers_0))
.pause(1)
.exec(http("request_6")
.get("/computers?p=3")
.headers(headers_0))
.pause(2)
.exec(http("request_7")
.get("/computers?p=4")
.headers(headers_0)
.resources(http("request_8")
.get("/computers?p=5")
.headers(headers_0)))
.pause(1)
}
object Edit {
val edit = exec(http("request_9")
.get("/computers/new")
.headers(headers_0))
.pause(1)
.exec(http("request_10")
.post("/computers")
.headers(headers_10)
.formParam("name", "VoxooBox")
.formParam("introduced", "12.11.2017")
.formParam("discontinued", "")
.formParam("company", "16")
.check(status.is(400)))
.pause(1)
.exec(http("request_11")
.post("/computers")
.headers(headers_10)
.formParam("name", "VoxooBox")
.formParam("introduced", "2017.08.17")
.formParam("discontinued", "")
.formParam("company", "16")
.check(status.is(400)))
.pause(1)
.exec(http("request_12")
.post("/computers")
.headers(headers_10)
.formParam("name", "VoxooBox")
.formParam("introduced", "2017-08-17")
.formParam("discontinued", "")
.formParam("company", "16"))
}
val users = scenario("Users").exec(Search.search, Browse.browse);
val admins = scenario("Admins").exec(Search.search, Browse.browse, Edit.edit);
setUp(
users.inject(constantUsersPerSec(200) during (300 seconds)),
admins.inject(constantUsersPerSec(50) during (300 seconds))
).protocols(httpProtocol)
}
it goes maximum to indicator of users:
================================================================================
2017-10-17 14:47:20 25s elapsed
---- Requests ------------------------------------------------------------------
> Global (OK=15950 KO=0 )
> request_0 (OK=5046 KO=0 )
> request_0 Redirect 1 (OK=3829 KO=0 )
> request_1 (OK=2582 KO=0 )
> request_2 (OK=1589 KO=0 )
> request_3 (OK=1249 KO=0 )
> request_3 Redirect 1 (OK=897 KO=0 )
> request_4 (OK=423 KO=0 )
> request_5 (OK=224 KO=0 )
> request_6 (OK=88 KO=0 )
> request_7 (OK=17 KO=0 )
> request_8 (OK=6 KO=0 )
---- Users ---------------------------------------------------------------------
[------ ] 0%
waiting: 55156 / active: 4842 / done:2
---- Admins --------------------------------------------------------------------
[------ ] 0%
waiting: 13788 / active: 1212 / done:0
================================================================================
14:47:21.107 [WARN ] i.g.h.a.ResponseProcessor - Request 'request_5' failed: j.n.ConnectException: connection timed out: computer-database.gatling.io/35.158.229.206:80
And then arise these kind of errors:
[WARN ] i.g.h.a.ResponseProcessor - Request 'request_4' failed: j.n.ConnectException: connection timed out: computer-database.gatling.io/35.158.229.206:80
13:31:12.407 [WARN ] i.g.h.a.ResponseProcessor - Request 'request_4' failed: j.n.ConnectException: Failed to open a socket.
In gatling.conf I found these rows:
ahc {
#keepAlive = true # Allow pooling HTTP connections (keep-alive header automatically added)
#connectTimeout = 10000 # Timeout when establishing a connection
#handshakeTimeout = 10000 # Timeout when performing TLS hashshake
#pooledConnectionIdleTimeout = 60000 # Timeout when a connection stays unused in the pool
#readTimeout = 60000 # Timeout when a used connection stays idle
#maxRetry = 2 # Number of times that a request should be tried again
#requestTimeout = 60000 # Timeout of the requests
#acceptAnyCertificate = true # When set to true, doesn't validate SSL certificates
#httpClientCodecMaxInitialLineLength = 4096 # Maximum length of the initial line of the response (e.g. "HTTP/1.0 200 OK")
#httpClientCodecMaxHeaderSize = 8192 # Maximum size, in bytes, of each request's headers
#httpClientCodecMaxChunkSize = 8192 # Maximum length of the content or each chunk
#webSocketMaxFrameSize = 10240000 # Maximum frame payload size
i guess it may be somehow related to my issue, or what i'm doing wrong? Is that my side-issue or their website just can't take it?
And why when I launch
users.inject(constantUsersPerSec(200) during (300 seconds)),
admins.inject(constantUsersPerSec(50) during (300 seconds))
In terminal it's
waiting: 55156 / active: 4842 / done:2
waiting: 13788 / active: 1212 / done:0
so many? How is it calculated? or why at all, explain someone to me, please.
Thanks.
My Computer:
MAC OS
Version: 10.12.6 (
Processor: 2.6 GHz Intel Core i5
Memory: 8 GB 1600 MHz DDR3

Answer 1

constantUsersPerSec() is about the number of users you're injecting, not the number of total users.
constantUsersPerSec(200) during (300 seconds), that's 60k users. So, that matches with waiting: 55156 / active: 4842 / done:2= 60k users.
I think that what you actually want is to inject users using the following strategy: rampUsers(10) over (300 seconds)