* Fw: binary size [not found] <MW3PR18MB3675DED196E7FA7E19455E15804A9@MW3PR18MB3675.namprd18.prod.outlook.com> @ 2022-01-04 2:12 ` Ming Cheng 2022-01-04 7:53 ` Jonathan Wakely 0 siblings, 1 reply; 8+ messages in thread From: Ming Cheng @ 2022-01-04 2:12 UTC (permalink / raw) To: gcc-help ________________________________ From: Ming Cheng <Ming.Cheng@flextrade.com> Sent: Tuesday, January 4, 2022 2:10 AM To: Ming Cheng <chengm349@hotmail.com> Subject: binary size Hi, If I use g++ (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5) Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -rw-r--r-- 1 mcheng flexusr 4632980 Jan 4 09:54 libfilelog.a If I use g++ (GCC) 10.2.1 20210130 (Red Hat 10.2.1-11) Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -rw-r--r-- 1 mcheng flexusr 7008006 Jan 4 10:08 libfilelog.a How to reduce binary size generated by C++20 compiler? Thanks. Ming Cheng ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Fw: binary size 2022-01-04 2:12 ` Fw: binary size Ming Cheng @ 2022-01-04 7:53 ` Jonathan Wakely 2022-01-04 11:42 ` Ming Cheng 0 siblings, 1 reply; 8+ messages in thread From: Jonathan Wakely @ 2022-01-04 7:53 UTC (permalink / raw) To: Ming Cheng; +Cc: gcc-help On Tue, 4 Jan 2022, 02:13 Ming Cheng via Gcc-help, <gcc-help@gcc.gnu.org> wrote: > > > ________________________________ > From: Ming Cheng <Ming.Cheng@flextrade.com> > Sent: Tuesday, January 4, 2022 2:10 AM > To: Ming Cheng <chengm349@hotmail.com> > Subject: binary size > > > Hi, > > > > If I use > > g++ (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5) > > Copyright (C) 2017 Free Software Foundation, Inc. > > This is free software; see the source for copying conditions. There is NO > > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > > > > -rw-r--r-- 1 mcheng flexusr 4632980 Jan 4 09:54 libfilelog.a > > > > If I use > > g++ (GCC) 10.2.1 20210130 (Red Hat 10.2.1-11) > > Copyright (C) 2020 Free Software Foundation, Inc. > > This is free software; see the source for copying conditions. There is NO > > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > > > > -rw-r--r-- 1 mcheng flexusr 7008006 Jan 4 10:08 libfilelog.a > > > > How to reduce binary size generated by C++20 compiler? > You're just looking at the file size, and it's not a binary. The difference is probably due to additional debug info produced by the new GCC. Other things can affect it too, like optimization settings. Why do you want to reduce it? What is your real goal? ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Fw: binary size 2022-01-04 7:53 ` Jonathan Wakely @ 2022-01-04 11:42 ` Ming Cheng 2022-01-04 11:46 ` Ming Cheng 2022-01-04 12:12 ` Jonathan Wakely 0 siblings, 2 replies; 8+ messages in thread From: Ming Cheng @ 2022-01-04 11:42 UTC (permalink / raw) To: Jonathan Wakely; +Cc: gcc-help Hi Jonathan, I just pasted a lib. It's applicable to binary. I am wondering whether there is a way to generate smaller binary by ver 10.2.1 close to 7.3.1? Would bigger size binary slower ? regard Ming ________________________________ From: Jonathan Wakely <jwakely.gcc@gmail.com> Sent: Tuesday, January 4, 2022 7:53 AM To: Ming Cheng <chengm349@hotmail.com> Cc: gcc-help <gcc-help@gcc.gnu.org> Subject: Re: Fw: binary size On Tue, 4 Jan 2022, 02:13 Ming Cheng via Gcc-help, <gcc-help@gcc.gnu.org<mailto:gcc-help@gcc.gnu.org>> wrote: ________________________________ From: Ming Cheng <Ming.Cheng@flextrade.com<mailto:Ming.Cheng@flextrade.com>> Sent: Tuesday, January 4, 2022 2:10 AM To: Ming Cheng <chengm349@hotmail.com<mailto:chengm349@hotmail.com>> Subject: binary size Hi, If I use g++ (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5) Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -rw-r--r-- 1 mcheng flexusr 4632980 Jan 4 09:54 libfilelog.a If I use g++ (GCC) 10.2.1 20210130 (Red Hat 10.2.1-11) Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -rw-r--r-- 1 mcheng flexusr 7008006 Jan 4 10:08 libfilelog.a How to reduce binary size generated by C++20 compiler? You're just looking at the file size, and it's not a binary. The difference is probably due to additional debug info produced by the new GCC. Other things can affect it too, like optimization settings. Why do you want to reduce it? What is your real goal? ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Fw: binary size 2022-01-04 11:42 ` Ming Cheng @ 2022-01-04 11:46 ` Ming Cheng 2022-01-04 12:12 ` Jonathan Wakely 1 sibling, 0 replies; 8+ messages in thread From: Ming Cheng @ 2022-01-04 11:46 UTC (permalink / raw) To: Jonathan Wakely; +Cc: gcc-help Compilation flag are similar/same except some more error/warn ignore flags for c++20. ________________________________ From: Ming Cheng <chengm349@hotmail.com> Sent: Tuesday, January 4, 2022 11:42 AM To: Jonathan Wakely <jwakely.gcc@gmail.com> Cc: gcc-help <gcc-help@gcc.gnu.org> Subject: Re: Fw: binary size Hi Jonathan, I just pasted a lib. It's applicable to binary. I am wondering whether there is a way to generate smaller binary by ver 10.2.1 close to 7.3.1? Would bigger size binary slower ? regard Ming ________________________________ From: Jonathan Wakely <jwakely.gcc@gmail.com> Sent: Tuesday, January 4, 2022 7:53 AM To: Ming Cheng <chengm349@hotmail.com> Cc: gcc-help <gcc-help@gcc.gnu.org> Subject: Re: Fw: binary size On Tue, 4 Jan 2022, 02:13 Ming Cheng via Gcc-help, <gcc-help@gcc.gnu.org<mailto:gcc-help@gcc.gnu.org>> wrote: ________________________________ From: Ming Cheng <Ming.Cheng@flextrade.com<mailto:Ming.Cheng@flextrade.com>> Sent: Tuesday, January 4, 2022 2:10 AM To: Ming Cheng <chengm349@hotmail.com<mailto:chengm349@hotmail.com>> Subject: binary size Hi, If I use g++ (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5) Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -rw-r--r-- 1 mcheng flexusr 4632980 Jan 4 09:54 libfilelog.a If I use g++ (GCC) 10.2.1 20210130 (Red Hat 10.2.1-11) Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -rw-r--r-- 1 mcheng flexusr 7008006 Jan 4 10:08 libfilelog.a How to reduce binary size generated by C++20 compiler? You're just looking at the file size, and it's not a binary. The difference is probably due to additional debug info produced by the new GCC. Other things can affect it too, like optimization settings. Why do you want to reduce it? What is your real goal? ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Fw: binary size 2022-01-04 11:42 ` Ming Cheng 2022-01-04 11:46 ` Ming Cheng @ 2022-01-04 12:12 ` Jonathan Wakely [not found] ` <SI2PR03MB5242FA109CAEDEBF0896B2AAFB4B9@SI2PR03MB5242.apcprd03.prod.outlook.com> 1 sibling, 1 reply; 8+ messages in thread From: Jonathan Wakely @ 2022-01-04 12:12 UTC (permalink / raw) To: Ming Cheng; +Cc: gcc-help On Tue, 4 Jan 2022 at 11:42, Ming Cheng <chengm349@hotmail.com> wrote: > > Hi Jonathan, > I just pasted a lib. It's applicable to binary. I am wondering whether there is a way to generate smaller binary by ver 10.2.1 close to 7.3.1? Would bigger size binary slower ? It depends why it's bigger. As I said, it's probably due to debug info, which doesn't affect performance at all. Using 'ls' to check the size is not helpful, because it doesn't tell you anything about the size of the executable code in the binary. Use 'size' to do that. Even if that shows the code is bigger, that doesn't mean it's going to be slower. The only way to tell if it's slower is to measure if it's slower. tl;dr it depends. ^ permalink raw reply [flat|nested] 8+ messages in thread
[parent not found: <SI2PR03MB5242FA109CAEDEBF0896B2AAFB4B9@SI2PR03MB5242.apcprd03.prod.outlook.com>]
* Re: Fw: binary size [not found] ` <SI2PR03MB5242FA109CAEDEBF0896B2AAFB4B9@SI2PR03MB5242.apcprd03.prod.outlook.com> @ 2022-01-05 8:10 ` Ming Cheng 2022-01-05 8:13 ` Jonathan Wakely 0 siblings, 1 reply; 8+ messages in thread From: Ming Cheng @ 2022-01-05 8:10 UTC (permalink / raw) To: gcc-help ________________________________ From: Ming Cheng <chengm349@hotmail.com> Sent: Wednesday, January 5, 2022 1:17 AM To: Jonathan Wakely <jwakely.gcc@gmail.com> Subject: Re: Fw: binary size Hi Jonathan, Thanks for this nice advice. I'd like to learn more about cmd size. Among text/data/bss sections, which section(s) has the most impact to the perf? You are right that people should do actual test. But for the same code, in theory, larger size's perf should be always <= smaller size's . Warm regards Ming ________________________________ From: Jonathan Wakely <jwakely.gcc@gmail.com> Sent: Tuesday, January 4, 2022 12:12 PM To: Ming Cheng <chengm349@hotmail.com> Cc: gcc-help <gcc-help@gcc.gnu.org> Subject: Re: Fw: binary size On Tue, 4 Jan 2022 at 11:42, Ming Cheng <chengm349@hotmail.com> wrote: > > Hi Jonathan, > I just pasted a lib. It's applicable to binary. I am wondering whether there is a way to generate smaller binary by ver 10.2.1 close to 7.3.1? Would bigger size binary slower ? It depends why it's bigger. As I said, it's probably due to debug info, which doesn't affect performance at all. Using 'ls' to check the size is not helpful, because it doesn't tell you anything about the size of the executable code in the binary. Use 'size' to do that. Even if that shows the code is bigger, that doesn't mean it's going to be slower. The only way to tell if it's slower is to measure if it's slower. tl;dr it depends. ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Fw: binary size 2022-01-05 8:10 ` Ming Cheng @ 2022-01-05 8:13 ` Jonathan Wakely 2022-01-05 9:15 ` Ming Cheng 0 siblings, 1 reply; 8+ messages in thread From: Jonathan Wakely @ 2022-01-05 8:13 UTC (permalink / raw) To: Ming Cheng; +Cc: gcc-help On Wed, 5 Jan 2022, 08:11 Ming Cheng via Gcc-help, <gcc-help@gcc.gnu.org> wrote: > > > Hi Jonathan, > > Thanks for this nice advice. I'd like to learn more about cmd size. Among > text/data/bss sections, which section(s) has the most impact to the perf? > You are right that people should do actual test. But for the same code, in > theory, larger size's perf should be always <= smaller size's . > Not necessarily. Function inlining can increase size but also increase performance. You need to measure. ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Fw: binary size 2022-01-05 8:13 ` Jonathan Wakely @ 2022-01-05 9:15 ` Ming Cheng 0 siblings, 0 replies; 8+ messages in thread From: Ming Cheng @ 2022-01-05 9:15 UTC (permalink / raw) To: Jonathan Wakely, gcc-help; +Cc: gcc-help Hi Jonathan, Got it . Newer g++ could handle inline function better for example(plus other improvement); which could also increase binary size. These possibly added code is reflected in text section mostly. Cheers Ming ________________________________ From: Jonathan Wakely <jwakely.gcc@gmail.com> Sent: Wednesday, January 5, 2022 8:13 AM To: Ming Cheng <chengm349@hotmail.com> Cc: gcc-help <gcc-help@gcc.gnu.org> Subject: Re: Fw: binary size On Wed, 5 Jan 2022, 08:11 Ming Cheng via Gcc-help, <gcc-help@gcc.gnu.org<mailto:gcc-help@gcc.gnu.org>> wrote: Hi Jonathan, Thanks for this nice advice. I'd like to learn more about cmd size. Among text/data/bss sections, which section(s) has the most impact to the perf? You are right that people should do actual test. But for the same code, in theory, larger size's perf should be always <= smaller size's . Not necessarily. Function inlining can increase size but also increase performance. You need to measure. ^ permalink raw reply [flat|nested] 8+ messages in thread
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2022-01-04 2:12 ` Fw: binary size Ming Cheng
2022-01-04 7:53 ` Jonathan Wakely
2022-01-04 11:42 ` Ming Cheng
2022-01-04 11:46 ` Ming Cheng
2022-01-04 12:12 ` Jonathan Wakely
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2022-01-05 8:10 ` Ming Cheng
2022-01-05 8:13 ` Jonathan Wakely
2022-01-05 9:15 ` Ming Cheng
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