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One common reason this can happen is if an application runs entirely in one goroutine but GOMAXPROCS is >1
from the top result below
https://go.dev/doc/gc-guide
"The heap" can be thought of as a catch-all for memory allocation, for when Go values need to be placed somewhere
https://go.dev/issue/73581
When scanning a span, if the hit flag is not set, then the garbage collector can directly scan the span’s representative, instead of processing the entire
https://go.dev/blog/greenteagc
var x = make([]*int, 10) // global
The Go compiler can’t allocate the slice backing store anywhere except the heap, since it’s very hard, and maybe even impossible, for it to know how long x will refer to the object for
https://pkg.go.dev/runtime/debug?tab=doc
2
SetMaxThreads sets the maximum number of operating system threads that the Go program can use
https://go.dev/blog/testing-time
You can verify that the thing has not happened yet, but how do you know with certainty that it isn’t going to happen later
https://go.dev/pkg/runtime/pprof
StartCPUProfile relies on the SIGPROF signal, but that signal will be delivered to the main program's SIGPROF signal handler (if any) not to the one used by Go
https://go.dev/blog/playground
By using a clever trick we can make a Go program think that it is sleeping, when really the sleeps take no time at all
https://go.dev/doc/godebug
21, a main package’s source files can include one or more //go:debug directives at the top of the file (preceding the package statement)