Re: [HACKERS] Re: [COMMITTERS] pgsql: Remove pgbench "progress" test pending solution of its timing is (fwd)

> On Thu, Jul 19, 2018 at 2:24 AM Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> wrote:
>
>
> Hello Heikki,
>
> >> [...]
> >> So threadRun() would not have the opportunity to stop the scheduled
> >> transaction, even if beyond the end of run, because it would not have got
> >> out of doCustom, in the case I outlined above.
> >
> > I see. Instead of moving to FINISHED state, then, we could stay in THROTTLE
> > state, and 'return' out of doCustom(), to give the code in threadRun() a
> > chance to detect that the timer is up. Something like the attached. (I moved
> > the check after the check for latency_limit, because that code updates
> > txn_scheduled. Seems more like a more correct place, although that's as a
> > separate issue.)
>
> Although I think it would works, I do not find it better than the previous
> situation: Before the change throttling simply jumps to finished if time
> is up, while with that option the jump cannot be seen from within doCustom
> and relies on threadRun to do so, which is somehow much harder to see from
> the code because things happen in two functions.
>
> I would rather move state changes from threadRun to doCustom only, so that
> they are all in one place where it is easier to check and understand.
>
> As a PoC, see attached which does that and also records all stats instead
> of trying to be clever, and tries to homogeneise comments somehow. As I
> find it strange that a script can be interrupted in sleep and after a
> shell command, but not in other states, rather documents that once it
> started it will run to its end, and only cut it out before or after, but
> not within. Also, there are no state changes outside doCustom, and
> threadRun only looks at the states for decisions.

Unfortunately, there was no activity over the last few commitfests and the
proposed patch pgbench-tap-progress-6 can't be applied anymore without
conflicts. Fabien, what are your plans about it, could you please post a
rebased version?