Recovering doesn’t work here because what you experience is not a panicing state. Go 1.6 added a lightweight concurrent misuse of maps detection to the runtime: The runtime has added lightweight, best-effort detection of concurrent misuse of maps. As always, if one goroutine is writing to a map, no other goroutine should be reading or … Read more
Note that one interesting aspect of using struct{} for the type pushed to a channel (as opposed to int or bool), is that the size of an empty struct is… 0! See the recent article “The empty struct” (March 2014) by Dave Cheney. You can create as many struct{} as you want (struct{}{}) to push … Read more
I think you need to change your max file descriptors. I have run into the same problem on one of my development VMs before and needed to change the file descriptors max, not anything with inotify settings. FWIW, your program runs fine on my VM. ·> ulimit -n 120000 But after I run ·> ulimit … Read more
If a goroutine is blocking, the runtime will start a new OS thread to handle the other goroutines until the blocking one stops blocking. Reference : https://groups.google.com/forum/#!topic/golang-nuts/2IdA34yR8gQ
Goroutines run concurrently, independently, so without explicit synchronization you can’t predict execution and completion order. So as it is, you can’t pair returned numbers with the input numbers. You can either return more data (e.g. the input number and the output, wrapped in a struct for example), or pass pointers to the worker functions (launched … Read more
If a goroutine is blocked, there is no cost involved other than: memory usage slower garbage-collection The costs (in terms of memory and average time to actually start executing a goroutine) are: Go 1.6.2 (April 2016) 32-bit x86 CPU (A10-7850K 4GHz) | Number of goroutines: 100000 | Per goroutine: | Memory: 4536.84 bytes | Time: … Read more
When the main function ends, the program ends with it. It does not wait for other goroutines to finish. Quoting from the Go Language Specification: Program Execution: Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other … Read more
Yes, it’s complicated, But there are a couple of rules of thumb that should make things feel much more straightforward. prefer using formal arguments for the channels you pass to go-routines instead of accessing channels in global scope. You can get more compiler checking this way, and better modularity too. avoid both reading and writing … Read more
Go uses case to determine whether a particular identifier is public or private within the context of your package. In your first example, the fields are not visible to json.Marshal because it is not part of the package containing your code. When you changed the fields to be upper case, they became public so could … Read more
There is no direct correlation. Threads used by your app may be less than, equal to or more than 10. Quoting from the package doc of runtime: The GOMAXPROCS variable limits the number of operating system threads that can execute user-level Go code simultaneously. There is no limit to the number of threads that can … Read more