runtime/debug: provide channel statistics

[MichaelTJones]

I just now happened to want to know how many channel sends a certain Go program made. 

This class of statistic would interesting for a Go runtime environment variable, akin to
GC tracing, to gather and report on program exit. "N send, N receive, ..."
Maybe K blocked or Z goroutines spawned, Z' still alive.

[robpike]

Comment 1:

Labels changed: added priority-later, removed priority-triage.

Status changed to Accepted.

[rsc]

Comment 2:

Labels changed: added go1.3.

[robpike]

Comment 4:

Labels changed: removed go1.3.

[rsc]

Comment 5:

Labels changed: added go1.3maybe.

[rsc]

Comment 6:

Labels changed: added release-none, removed go1.3maybe.

[rsc]

Comment 7:

Labels changed: added repo-main.

[odeke-em]

Thank you for the feature request @MichaelTJones! @mknyszek, perhaps this issue might interest you?

[mknyszek]

I don't think we're going to add something like this to existing packages, however there is #37112 for which a statistic like this would be appropriate.

I think in practice for this to not be terribly slow we would need to do something similar to what we do for allocations: accumulate the statistics per-P and flush them during a stats-reading STW operation.

[MichaelTJones]

Understood. This zombie proposal has staggered along for seven years and can now die and find peace.

On Mon, Jun 8, 2020 at 8:26 AM Michael Knyszek ***@***.***> wrote: I don't think we're going to add something like this to existing packages, however there is #37112 <#37112> for which a statistic like this would be appropriate. I think in practice for this to not be terribly slow we would need to do something similar to what we do for allocations: accumulate the statistics per-P and flush them during a stats-reading STW operation. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#5611 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB4DFJOTTKSMMBSDJIVSR6DRVT7LPANCNFSM4NWLJYEQ> .

-- *Michael T. Jonesmichael.jones@gmail.com <michael.jones@gmail.com>*

[odeke-em]

Thank you for the responses @mknyszek and @MichaelTJones!

This zombie proposal has staggered along for seven years and can now die and find peace.

Bits to bits, atoms to atoms, I shall thus close this issue. Thank you.