Re: Add connection active, idle time to pg_stat_activity

On Mon, 15 Nov 2021 at 12:40, Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
>
> On Mon, Nov 15, 2021 at 4:46 PM Rafia Sabih <rafia(dot)pghackers(at)gmail(dot)com> wrote:
> >
> > On Mon, 15 Nov 2021 at 10:24, Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> > >
> > > On Wed, Nov 10, 2021 at 1:47 PM Rafia Sabih <rafia(dot)pghackers(at)gmail(dot)com> wrote:
> > > >
> > > > > It seems that in beentry->st_idle_time, you want to compute the
> > > > > STATE_IDLE, but that state is not handled in the outer "if", that
> > > > > means whenever it comes out of the
> > > > > STATE_IDLE, it will not enter inside this if check. You can run and
> > > > > test, I am sure that with this patch the "idle_time" will always
> > > > > remain 0.
> > > > >
> > > > Thank you Dilip for your time on this.
> > > > And yes you are right in both your observations.
> > > > Please find the attached patch for the updated version.
> > >
> > > Looks fine now except these variable names,
> > >
> > > PgStat_Counter pgStatTransactionIdleTime = 0;
> > > +PgStat_Counter pgStatTransactionIdleInTxnTime = 0;
> > >
> > > Now, pgStatTransactionIdleTime is collecting just the Idle time so
> > > pgStatTransactionIdleTime should be renamed to "pgStatIdleTime" and
> > > pgStatTransactionIdleInTxnTime should be renamed to
> > > "pgStatTransactionIdleTime"
> > >
> > Good point!
> > Done.
>
> @@ -1018,7 +1019,7 @@ pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg,
> TimestampTz now)
> pgLastSessionReportTime = now;
> tsmsg->m_session_time = (PgStat_Counter) secs * 1000000 + usecs;
> tsmsg->m_active_time = pgStatActiveTime;
> - tsmsg->m_idle_in_xact_time = pgStatTransactionIdleTime;
> + tsmsg->m_idle_in_xact_time = pgStatIdleTime;
>
> I think this change is wrong, basically, "tsmsg->m_idle_in_xact_time"
> is used for counting the database level idle in transaction count, you
> can check "pg_stat_get_db_idle_in_transaction_time" function for that.
> So "pgStatTransactionIdleTime" is the variable counting the idle in
> transaction time, pgStatIdleTime is just counting the idle time
> outside the transaction so if we make this change we are changing the
> meaning of tsmsg->m_idle_in_xact_time.

Got it.
Updated

--
Regards,
Rafia Sabih