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From: Bruce Richardson <bruce.richardson@intel.com>
To: Andrzej Ostruszka <amo@semihalf.com>
Cc: Thomas Monjalon <thomas@monjalon.net>,
	Ray Kinsella <mdr@ashroe.eu>,
	dev@dpdk.org, Aaron Conole <aconole@redhat.com>,
	Michael Santana <msantana@redhat.com>,
	John McNamara <john.mcnamara@intel.com>,
	Marko Kovacevic <marko.kovacevic@intel.com>,
	David Hunt <david.hunt@intel.com>,
	Vladimir Medvedkin <vladimir.medvedkin@intel.com>,
	Robert Sanford <rsanford@akamai.com>,
	Erik Gabriel Carrillo <erik.g.carrillo@intel.com>,
	mattias.ronnblom@ericsson.com, stephen@networkplumber.org,
	Andrzej Ostruszka <aostruszka@marvell.com>
Subject: Re: [dpdk-dev] [PATCH v2 01/10] build: add an option to enable LTO build
Date: Mon, 23 Sep 2019 14:06:59 +0200
Message-ID: <20190923120658.GA2003@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <f657fdb1-5ddb-d9eb-4345-d1d7bc8404e1@semihalf.com>

On Mon, Sep 23, 2019 at 02:03:35PM +0200, Andrzej Ostruszka wrote:
> On 9/23/19 9:23 AM, Thomas Monjalon wrote:
> [...]
> > Please can we get some numbers to understand how longer it is?
> 
> Below numbers are for make based (make -j8) clean build on my system:
> 
> non-LTO
> real: 144.56s, user:451.81s, sys:48.46s, CPU:346%
> 
> LTO
> real: 607.20s, user:2141.71s, sys:88.36s, CPU:367%
> 
> So it is similar ~5x increase as Mattias has reported.  Have not
> measured it, but the lion share of that increase is due to linking of
> 'test' apps.
> 

Interesting. Do we want to explicitly not use lto for the test app?

> I would vote for leaving LTO as an option - although I must admit I did
> not get what Ray meant by saying:
> 
> 20/09/2019 09:38, Ray Kinsella:
> [...]
> > I would just like to see it in or out, not another build time option.
> 
> If "in or out" means "either accept the patches with LTO on and no
> config option or reject them" then I disagree.  Even if run time
> improvements are questionable I find the additional link time warnings
> beneficial and would like to have an easy way to turn them on when doing
> final touches before pushing out.

Looking at it from the meson build view-point, support for lto is built
into the tool itself, so the support can't be removed as such - it will
either result in a working build or not. Therefore, I'm for taking a patch
to support lto in meson, whatever about supporting it through make etc.

/Bruce

  reply index

Thread overview: 110+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-17  7:57 [dpdk-dev] [PATCH v2 00/10] Add an option to use LTO for DPDK build Andrzej Ostruszka
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 01/10] build: add an option to enable LTO build Andrzej Ostruszka
2019-09-18 10:36   ` Bruce Richardson
2019-09-18 13:32   ` Ray Kinsella
2019-09-19 12:35     ` Andrzej Ostruszka
2019-09-19 13:28       ` Ray Kinsella
2019-09-19 15:16         ` Bruce Richardson
2019-09-20  7:38           ` Ray Kinsella
2019-09-23  7:23             ` Thomas Monjalon
2019-09-23  9:36               ` Ray Kinsella
2019-09-23 10:16                 ` Mattias Rönnblom
2019-09-23 12:03               ` Andrzej Ostruszka
2019-09-23 12:06                 ` Bruce Richardson [this message]
2019-09-23 13:02                   ` Andrzej Ostruszka
2019-09-23 16:13                     ` Bruce Richardson
2019-09-24  6:46                       ` Andrzej Ostruszka
2019-09-24 10:25                         ` Bruce Richardson
2019-09-24 11:52                           ` Andrzej Ostruszka
2019-09-24 12:11                             ` Bruce Richardson
2019-09-24 12:59                           ` Neil Horman
2019-09-24 16:01                             ` Ray Kinsella
2019-09-26 15:32                             ` Andrzej Ostruszka
2019-09-27 19:55                               ` Bruce Richardson
2019-09-23 12:16                 ` Ray Kinsella
2019-10-27 11:31     ` Thomas Monjalon
2019-10-28  8:36       ` Andrzej Ostruszka
2019-10-28  9:07         ` Thomas Monjalon
2019-10-28 12:12         ` Andrzej Ostruszka
2019-10-28 17:16           ` Thomas Monjalon
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 02/10] eventdev: fix possible use of uninitialized var Andrzej Ostruszka
2019-10-12 13:35   ` Jerin Jacob
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 03/10] app/eventdev: fix maybe-uninitialized warnings for LTO build Andrzej Ostruszka
2019-10-12 13:52   ` Jerin Jacob
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 04/10] event/octeontx2: " Andrzej Ostruszka
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 05/10] app/test: " Andrzej Ostruszka
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 06/10] net/dpaa2: fix possible use of uninitialized vars Andrzej Ostruszka
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 07/10] net/e1000: fix maybe-uninitialized warnings for LTO build Andrzej Ostruszka
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 08/10] net/i40e: " Andrzej Ostruszka
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 09/10] net/ifc: " Andrzej Ostruszka
2019-09-17  7:57 ` [dpdk-dev] [PATCH v2 10/10] net/qede: " Andrzej Ostruszka
     [not found] ` <20191021105707.25691-1-aostruszka@marvell.com>
     [not found]   ` <20191021105707.25691-2-aostruszka@marvell.com>
2019-10-21 12:59     ` [dpdk-dev] [PATCH v3 01/10] build: add an option to enable " Bruce Richardson
2019-10-22  8:53       ` Andrzej Ostruszka
2019-10-22 11:54 ` [dpdk-dev] [PATCH v4 00/10] Add an option to use LTO for DPDK build Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 01/10] build: add an option to enable LTO build Andrzej Ostruszka
2019-10-22 12:45     ` Bruce Richardson
2019-10-27 11:47     ` Thomas Monjalon
2019-10-28 10:47       ` Andrzej Ostruszka
2019-10-28 11:03         ` Thomas Monjalon
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 02/10] eventdev: fix possible use of uninitialized var Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 03/10] app/eventdev: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 04/10] event/octeontx2: " Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 05/10] app/test: " Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 06/10] net/dpaa2: fix possible use of uninitialized vars Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 07/10] net/e1000: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 08/10] net/i40e: " Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 09/10] net/ifc: " Andrzej Ostruszka
2019-10-22 11:54   ` [dpdk-dev] [PATCH v4 10/10] net/qede: " Andrzej Ostruszka
2019-10-22 12:48   ` [dpdk-dev] [PATCH v4 00/10] Add an option to use LTO for DPDK build Bruce Richardson
2019-10-22 13:03     ` Andrzej Ostruszka
2019-10-28 14:21   ` [dpdk-dev] [PATCH v5 00/11] " Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 01/11] build: annotate versioned symbols with __vsym macro Andrzej Ostruszka
2019-10-29 10:49       ` Neil Horman
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 02/11] build: add an option to enable LTO build Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 03/11] eventdev: fix possible use of uninitialized var Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 04/11] app/eventdev: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 05/11] event/octeontx2: " Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 06/11] app/test: " Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 07/11] net/dpaa2: fix possible use of uninitialized vars Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 08/11] net/e1000: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 09/11] net/i40e: " Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 10/11] net/ifc: " Andrzej Ostruszka
2019-10-28 14:21     ` [dpdk-dev] [PATCH v5 11/11] net/qede: " Andrzej Ostruszka
2019-10-29 14:12     ` [dpdk-dev] [PATCH v6 00/12] Add an option to use LTO for DPDK build Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 01/12] doc: fix description of versioning macros Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 02/12] build: annotate versioned symbols with __vsym macro Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 03/12] build: add an option to enable LTO build Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 04/12] eventdev: fix possible use of uninitialized var Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 05/12] app/eventdev: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 06/12] event/octeontx2: " Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 07/12] app/test: " Andrzej Ostruszka
2019-11-01 17:15         ` Wang, Yipeng1
2019-11-04 13:48           ` Andrzej Ostruszka
2019-11-07 17:48             ` Wang, Yipeng1
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 08/12] net/dpaa2: fix possible use of uninitialized vars Andrzej Ostruszka
2019-11-04 11:46         ` Hemant Agrawal
2019-11-04 14:33           ` Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 09/12] net/e1000: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 10/12] net/i40e: " Andrzej Ostruszka
2019-11-01  2:05         ` Xing, Beilei
2019-11-04 14:06           ` Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 11/12] net/ifc: " Andrzej Ostruszka
2019-10-29 14:12       ` [dpdk-dev] [PATCH v6 12/12] net/qede: " Andrzej Ostruszka
2019-10-30  9:09       ` [dpdk-dev] [PATCH v6 00/12] Add an option to use LTO for DPDK build Andrzej Ostruszka
2019-10-30 14:23         ` Aaron Conole
2019-11-07 15:03       ` [dpdk-dev] [PATCH v7 " Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 01/12] doc: fix description of versioning macros Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 02/12] build: annotate versioned symbols with __vsym macro Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 03/12] build: add an option to enable LTO build Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 04/12] eventdev: fix possible use of uninitialized var Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 05/12] app/eventdev: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 06/12] event/octeontx2: " Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 07/12] app/test: " Andrzej Ostruszka
2019-11-07 17:53           ` Wang, Yipeng1
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 08/12] net/dpaa2: fix possible use of uninitialized vars Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 09/12] net/e1000: clean LTO build warnings (maybe-uninitialized) Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 10/12] net/i40e: " Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 11/12] net/ifc: " Andrzej Ostruszka
2019-11-07 15:03         ` [dpdk-dev] [PATCH v7 12/12] net/qede: " Andrzej Ostruszka
2019-11-08 14:24         ` [dpdk-dev] [PATCH v7 00/12] Add an option to use LTO for DPDK build Thomas Monjalon
2019-11-01 21:33 ` [dpdk-dev] [PATCH v2 00/10] " Stephen Hemminger

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