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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Ranier Vilela <ranier.vf@gmail.com>
Cc: ldh@laurent-hasson.com <ldh@laurent-hasson.com>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Big Performance drop of Exceptions in UDFs between V11.2 and 13.4
Date: Sun, 29 Aug 2021 09:35:05 -0400
Message-ID: <1124170.1630244105@sss.pgh.pa.us> (raw)
In-Reply-To: <CAEudQApD2F17Fz7cQNUZbrx7K3P1Y=KFCc4V3UZthPFgp+radQ@mail.gmail.com>
References: <MN2PR15MB2560AE2A878FBBE88DCFF33385C29@MN2PR15MB2560.namprd15.prod.outlook.com>
	<2092859.1629558281@sss.pgh.pa.us>
	<MN2PR15MB25607BDC72A325CA9B9D3E3385C29@MN2PR15MB2560.namprd15.prod.outlook.com>
	<2136207.1629569846@sss.pgh.pa.us>
	<20210821191950.GW10479@telsasoft.com>
	<MN2PR15MB2560ED2A8F967B14E7D7881E85C29@MN2PR15MB2560.namprd15.prod.outlook.com>
	<20210821221729.GY10479@telsasoft.com>
	<MN2PR15MB2560FB03666CEABB651FB32185C29@MN2PR15MB2560.namprd15.prod.outlook.com>
	<MN2PR15MB256034533A31A7C11E3C347985C39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<CAEudQAocYZieAMgCtXa8Oau8=dVJ1_R1r0coLeF1LfiYkBCTNA@mail.gmail.com>
	<20210822154758.GZ10479@telsasoft.com>
	<30496.1629654632@sss.pgh.pa.us>
	<MN2PR15MB2560C3FF951319B18A3CA83585C39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<MN2PR15MB25601CCA9E337403E1754BDE85C39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<35729.1629660223@sss.pgh.pa.us>
	<MN2PR15MB2560634E97465D56FFB4601D85C39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<38107.! 1629663085@sss.pgh.pa.us>
	<MN2PR15MB2560F5ABDE7BE85C11625AFD85C39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<846170.1630086205@sss.pgh.pa.us>
	<DM6PR15MB2554454557C7612A93F76A9D85C99@DM6PR15MB2554.namprd15.prod.outlook.com>
	<1050917.1630180243@sss.pgh.pa.us>
	<MN2PR15MB2560A083DA8CD3418BEA1DA085CA9@MN2PR15MB2560.namprd15.prod.outlook.com>
	<CAEudQApD2F17Fz7cQNUZbrx7K3P1Y=KFCc4V3UZthPFgp+radQ@mail.gmail.com>

Ranier Vilela <ranier.vf@gmail.com> writes:
> I retested this case with HEAD, and it seems to me that NLS does affect it.

Sure, there's no question that message translation will have *some* cost.
But on my machine it is an incremental tens-of-percent kind of cost,
and that is the result you're getting as well.  So it's not very clear
where these factor-of-several-hundred differences are coming from.

			regards, tom lane





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