I am running a program which reads multiple gzipped input files and performs some processing on each line of the file. It creates 8 goroutines (1 per input file which is to be processed. the number of such files can be thought to remain 8 at the max). Each of the go routines send to a buffered channel after finishing processing of their respective file. After creating the go routines, the program waits (using WaitGroup) for all go routines to finish and also drain the channel for all the values sent by the go routines.
I have an 4 core CPU with 2 threads per core = 8 logical cores. But I set GOMAXPROCS=4 When I run the program with scheduler trace interval set to 1000ms, I can see the following : SCHED 1001ms: gomaxprocs=4 idleprocs=0 threads=8 spinningthreads=0 idlethreads=0 runqueue=0 [0 0 0 1] SCHED 2008ms: gomaxprocs=4 idleprocs=0 threads=8 spinningthreads=0 idlethreads=1 runqueue=0 [1 0 5 0] SCHED 3015ms: gomaxprocs=4 idleprocs=0 threads=8 spinningthreads=0 idlethreads=1 runqueue=1 [0 0 1 0] SCHED 4022ms: gomaxprocs=4 idleprocs=0 threads=9 spinningthreads=0 idlethreads=2 runqueue=0 [0 0 0 0] SCHED 5029ms: gomaxprocs=4 idleprocs=0 threads=9 spinningthreads=0 idlethreads=2 runqueue=1 [0 0 0 4] If I create 8 go routines, shouldn't they all be distributed equally among the 4 logical cores ? Why do some runqueues of the logical cores show values of 4 or 5 and some have values of 0 ? I was hoping to see something like which I according to my understanding means that all 4 processors have 1 go routine each waiting in the local runqueue and at the same time has 1 go routine running on the assigned OS Thread : SCHED 1001ms: gomaxprocs=4 idleprocs=0 threads=8 spinningthreads=0 idlethreads=0 runqueue=0 [1 1 1 1] Thanks. -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/0c34efb7-18e0-4b16-9e71-fbb4efd57374o%40googlegroups.com.
