That's what globals do. On Tuesday, 27 June 2017 20:32:12 UTC+10, Nupur Bansal wrote: > > It seems my global variables are being accessed concurrently by goroutines > and it is causing race condition. > > On Tuesday, June 27, 2017 at 3:05:03 PM UTC+5:30, Dave Cheney wrote: >> >> You have at least one data race in your program. >> >> https://golang.org/doc/go1.6#runtime >> https://blog.golang.org/race-detector >> https://golang.org/doc/articles/race_detector.html >> >> Looking at the panic message it looks like your >> findSupplierOrBuyer method is updating a map that is part of a User's >> Dashboard. As the parent method is called GetDashboard it is possible that >> you are sharing the same Dashboard value between mutliple goroutines. >> >> Have a read of the links above, and start running your tests under the >> race detector; go test -race. >> >> On Tuesday, 27 June 2017 19:25:57 UTC+10, Nupur Bansal wrote: >>> >>> Top part says: >>> >>> fatal error: concurrent map writes >>> >>> goroutine 23673 [running]: >>> runtime.throw(0x95fc7f, 0x15) >>> /usr/lib/go/src/runtime/panic.go:566 +0x95 fp=0xc420482708 >>> sp=0xc4204826e8 >>> runtime.mapassign1(0x8cb4c0, 0xc4200e8e10, 0xc420482a88, 0xc420482a68) >>> /usr/lib/go/src/runtime/hashmap.go:553 +0x2e1 fp=0xc4204827f0 >>> sp=0xc420482708 >>> wservce/models.findSupplierOrBuyer(0xc42038812e, 0x6, 0x0, 0x0, >>> 0xc42073e270, 0xf, 0xc420388123, 0x2, 0xba9ac0, 0xc42051c800, ...) >>> /home/nupur/golang/code/src/wservce/models/userDashboard.go:153 >>> +0xc07 fp=0xc420482e80 sp=0xc4204827f0 >>> wservce/models.(*UserDashboard).GetDashboardDetails(0xc4203622a0, >>> 0xba9ac0, 0xc42051c800, 0xc42073e270, 0xf, 0x1, 0x125) >>> /home/nupur/golang/code/src/wservce/models/userDashboard.go:75 >>> +0x14d fp=0xc420483040 sp=0xc420482e80 >>> wservce/controllers.Request.Dashboard(0xba9ac0, 0xc42051c800, >>> 0xc42073e180, 0xf, 0xc4203880f4, 0x40, 0xc4203880f0, 0x3, 0xc42073e270, >>> 0xf, ...) >>> /home/nupur/golang/code/src/wservce/controllers/users.go:172 +0x106c >>> fp=0xc420483410 sp=0xc420483040 >>> wservce/controllers.(*Request).Dashboard(0xc4202b8660, 0x0, 0x0) >>> <autogenerated>:5 +0x6e fp=0xc420483488 sp=0xc420483410 >>> runtime.call32(0xc4204d09c0, 0xc4205aa060, 0xc420588960, 0x800000018) >>> >>> >>> On Tuesday, June 27, 2017 at 10:04:06 AM UTC+5:30, Dave Cheney wrote: >>>> >>>> Your stacktrace is truncated; the crucial part appears at the top of >>>> the output starting with >>>> >>>> panic: >>>> >>>> or >>>> >>>> runtime error: >>>> >>>> On Tuesday, 27 June 2017 14:31:57 UTC+10, Nupur Bansal wrote: >>>>> >>>>> When a load test is run on my service, after about 1000-1500 requests, >>>>> I get this stack trace. I am unable to resolve why it was generated. >>>>> Yes, the output from the service is passed to an output channel and is >>>>> read through that channel. >>>>> >>>>> I am doing something like this: >>>>> package main >>>>> >>>>> import ( >>>>> "fmt" >>>>> //"time" >>>>> ) >>>>> >>>>> func myFunc(done chan string) { >>>>> // Doing something in parallel >>>>> for i := 0; i < 10; i++ { >>>>> fmt.Println(i) >>>>> } >>>>> fmt.Println("Hey! I do useless stuff!") >>>>> done <- "I'm done!" // We send a message on the channel >>>>> } >>>>> >>>>> func main() { >>>>> done1 := make(chan string) >>>>> done2 := make(chan string) >>>>> go myFunc(done1) >>>>> go myFunc2(done2) >>>>> msg := <-done1 >>>>> msg2 := <-done2 >>>>> fmt.Println(msg, msg2) >>>>> >>>>> fmt.Println("Message received, you were indeed useless..") >>>>> } >>>>> >>>>> func myFunc2(done chan string) { >>>>> // Doing something in parallel >>>>> for i := 10; i < 20; i++ { >>>>> fmt.Println(i) >>>>> } >>>>> fmt.Println("Hey! Baby!") >>>>> done <- "I'm again done!" // We send a message on the channel >>>>> } >>>>> >>>>> >>>>> On Thursday, June 22, 2017 at 8:09:33 PM UTC+5:30, Ian Lance Taylor >>>>> wrote: >>>>>> >>>>>> On Wed, Jun 21, 2017 at 10:49 PM, <nupur....@indiamart.com> wrote: >>>>>> > >>>>>> > I am getting the following error when my services are being load >>>>>> tested. >>>>>> > I am new to goroutines and may be missing something in my >>>>>> implementation. >>>>>> > My service on being hit is running 2 goroutines that call an http >>>>>> request. >>>>>> > After both return , the response from both http requests is >>>>>> returned into a >>>>>> > channel. >>>>>> > What could be the possible reason of the following stack trace of >>>>>> error?? >>>>>> >>>>>> What caused the stack trace? I would have expected to see something >>>>>> at the start saying why it was generated, but I didn't. >>>>>> >>>>>> At first glance it looks like you have a deadlock somewhere. Is >>>>>> there >>>>>> something reading from the channels? >>>>>> >>>>>> Ian >>>>>> >>>>>
-- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
