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Groups > comp.lang.c++ > #80526
| From | "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Why does vector::reserve() not grow exponentially ? |
| Date | 2021-06-20 14:56 -0700 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <saodhr$1at6$1@gioia.aioe.org> (permalink) |
| References | (3 earlier) <saibko$74o$1@dont-email.me> <cone.1624052478.543142.126471.1004@monster.email-scan.com> <sak9f6$cl5$1@dont-email.me> <cone.1624108118.804038.143792.1004@monster.email-scan.com> <sao09m$b9k$1@dont-email.me> |
On 6/20/2021 11:09 AM, Paavo Helde wrote:
> 19.06.2021 16:08 Sam kirjutas:
>> Paavo Helde writes:
>>
>>> For me, the biggest drawback of std::shared_ptr is that it is
>>> multithread-safe. This means that it has to contain some thread
>>> synchronization, however
>>
>> The thread synchronization should be nothing beyond keeping the
>> reference counter as a std::atomic object. Nothing more should be
>> needed, for 99% of the use cases. Some kind of locking is needed to
>> support weak references, that's the only situation where actual
>> locking is needed.
>>
>> But, for garden-variety smart pointers, an atomic counter is all
>> that's needed whose overhead is quite negligible.
>>
>>> Compared with the expense of that, the amount of pointers (1 or 2),
>>> even the number of dynamic allocations (1 or 2) pale in comparison
>>> (the dynamic allocations happen much more rarely then refcount updates).
>>
>> Well the amount of pointers becomes a factor here not merely because
>> of the smart pointer itself, but because of shared_ptr dumb design, of
>> using two pointers instead of one.
>>
>>> So in our codebase there is a custom non-synchronized smart-pointer
>>> used for all the "data" classes (as opposed to "entity" classes). And
>>> you were right, it is based on intrusive refcounting in a super root
>>> class, just because all of the code is under our control anyway.
>>
>> And if you make it atomic, you'll get thread safety. If you actually
>> go ahead and try to measure the additional overhead, I'd be surprised
>> if you'd be able to actually measure anything.
>
> Well, I took your word and measured the overheads. I'm foremost
> interested in my typical workloads, so that's the scenario I tested: all
> cpu cores maxed out, a lot of smart pointer copies intermixed with
> memory-heavish calculations. The program output is here (the "result" is
> only calculated to ensure all code branches calculate the same thing and
> nothing is optimized away).
>
> hardware_concurrency: 16
> Async pointer : result =1056964608, total time = 13.4281 s
> Atomic pointer : result =1056964608, total time = 24.774 s
> std::shared_ptr : result =1056964608, total time = 25.7377 s
> std::make_shared: result =1056964608, total time = 25.1681 s
>
> The measured times *contain the data processing*, so this means the
> actual synchronized pointer overhead is not 2x, but actually *many
> times* more expensive than an async smart pointer.
>
> These results suggest that I was right, any thread synchronization
> (including std::atomic_ptr with std::memory_order_relaxed) means heavy
> penalties, whereas extra pointers or extra dynamic allocations involved
> with std::shared_ptr only cost peanuts.
What is std::atomic_ptr?
>
> I guess one should better stop complaining about the shared_ptr design,
> it appears to be pretty fine for its intended purpose (safe usage).
>
> The code is below, feel free to try it out on your favorite platform. My
> numbers are from MSVC++ 2019, x64 Release build.
>
> ------------------------------------
[...]
> class AtomicBase {
> public:
> AtomicBase() : refcount(0) {}
> virtual ~AtomicBase() {}
> void Capture() { refcount.fetch_add(1, std::memory_order_relaxed); }
> void Release() { if (refcount.fetch_sub(1,
> std::memory_order_relaxed)==1) { delete this; } }
> private:
> std::atomic<int> refcount;
> };
[...]
You have some issues with your memory order here, relaxed is not going
to cut it. Also, better try to isolate the refcount on a cacheline, and
pad it.
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Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-10 12:18 +0200
Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-10 13:21 +0200
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-10 14:37 +0300
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-10 15:44 +0200
Re: Why does vector::reserve() not grow exponentially ? David Brown <david.brown@hesbynett.no> - 2021-06-10 16:39 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-10 16:47 +0200
Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-10 22:00 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-10 22:09 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-11 06:57 -0400
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Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-11 13:27 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-11 13:53 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-11 19:12 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 04:09 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-12 08:50 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 15:43 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-12 18:59 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-13 07:31 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 08:09 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-13 14:12 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 09:50 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-13 16:05 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 11:23 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-13 18:56 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 13:37 -0400
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Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-14 07:00 -0400
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Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-12 01:43 -0700
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 11:00 +0200
Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-12 02:04 -0700
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Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-12 02:24 -0700
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Re: Why does vector::reserve() not grow exponentially ? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-06-12 12:59 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 13:27 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 13:19 +0200
Re: Why does vector::reserve() not grow exponentially ? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-06-12 13:30 +0200
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Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-12 08:53 -0400
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Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-12 18:43 -0400
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Re: Why does vector::reserve() not grow exponentially ? Richard Damon <Richard@Damon-Family.org> - 2021-06-13 07:48 -0400
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Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 11:21 -0400
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Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 13:38 -0400
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Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-14 07:00 -0400
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Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-14 18:35 -0400
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Re: Why does vector::reserve() not grow exponentially MrSpook_ka1o_g@otuej9sdvqn8a4.gov.uk - 2021-06-15 12:54 +0000
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Re: Why does vector::reserve() not grow exponentially Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-16 17:50 +0200
Re: Why does vector::reserve() not grow exponentially MrSpook_hjesjs@8pot25r5sg1xe.info - 2021-06-16 15:45 +0000
Re: Why does vector::reserve() not grow exponentially Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-16 21:08 +0300
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Re: Why does vector::reserve() not grow exponentially ? David Brown <david.brown@hesbynett.no> - 2021-06-23 16:55 +0200
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-24 16:13 -0700
Re: Why does vector::reserve() not grow exponentially ? scott@slp53.sl.home (Scott Lurndal) - 2021-06-25 14:34 +0000
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-25 12:16 -0700
Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-22 15:36 -0700
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-24 16:09 -0700
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-21 17:12 -0700
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-20 19:03 -0400
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Re: Why does vector::reserve() not grow exponentially ? red floyd <no.spam.here@its.invalid> - 2021-06-18 00:18 -0700
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Re: Why does vector::reserve() not grow exponentially ? Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2021-06-21 22:48 +0100
Re: Why does vector::reserve() not grow exponentially ? Juha Nieminen <nospam@thanks.invalid> - 2021-06-22 05:30 +0000
Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-21 23:12 -0700
Re: Why does vector::reserve() not grow exponentially ? MrSpook_D_a3U17y@j_az.net - 2021-06-22 07:14 +0000
Re: Why does vector::reserve() not grow exponentially ? Manfred <noname@add.invalid> - 2021-06-22 13:49 +0200
Re: Why does vector::reserve() not grow exponentially ? Juha Nieminen <nospam@thanks.invalid> - 2021-06-22 08:03 +0000
Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-22 01:28 -0700
Re: Why does vector::reserve() not grow exponentially ? Juha Nieminen <nospam@thanks.invalid> - 2021-06-23 06:19 +0000
Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-23 04:18 -0700
Re: Why does vector::reserve() not grow exponentially ? Juha Nieminen <nospam@thanks.invalid> - 2021-06-21 12:39 +0000
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-15 08:01 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-15 08:12 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-15 15:34 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-15 17:37 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-16 02:17 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-15 21:11 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-16 07:09 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-16 06:37 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-16 13:01 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-16 08:16 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-16 15:35 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-16 17:40 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-16 13:40 +0200
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-16 18:10 +0300
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-16 14:37 +0300
Re: Why does vector::reserve() not grow exponentially ? scott@slp53.sl.home (Scott Lurndal) - 2021-06-16 15:04 +0000
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-16 17:37 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-16 17:40 -0400
Re: Why does vector::reserve() not grow exponentially ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-06-16 16:25 -0700
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-16 23:17 -0400
Re: Why does vector::reserve() not grow exponentially ? David Brown <david.brown@hesbynett.no> - 2021-06-17 09:22 +0200
Re: Why does vector::reserve() not grow exponentially ? MrSpook_e0mt@hszpo62mi.com - 2021-06-17 08:31 +0000
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-17 07:11 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-17 09:24 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-17 16:43 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 08:11 -0400
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-13 08:10 -0400
Re: Why does vector::reserve() not grow exponentially ? David Brown <david.brown@hesbynett.no> - 2021-06-12 14:01 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 15:34 +0200
Re: Why does vector::reserve() not grow exponentially ? Ian Collins <ian-news@hotmail.com> - 2021-06-13 13:01 +1200
Re: Why does vector::reserve() not grow exponentially ? Öö Tiib <ootiib@hot.ee> - 2021-06-13 07:39 -0700
Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-12 10:51 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 11:03 +0200
Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-12 13:07 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 13:22 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-12 08:52 -0400
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-10 16:51 -0700
Re: Why does vector::reserve() not grow exponentially ? David Brown <david.brown@hesbynett.no> - 2021-06-11 09:52 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-11 13:17 +0200
Re: Why does vector::reserve() not grow exponentially ? David Brown <david.brown@hesbynett.no> - 2021-06-11 13:45 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-11 13:54 +0200
Re: Why does vector::reserve() not grow exponentially ? David Brown <david.brown@hesbynett.no> - 2021-06-11 15:58 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-11 16:35 +0200
Re: Why does vector::reserve() not grow exponentially ? Manfred <noname@add.invalid> - 2021-06-11 17:11 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-11 17:12 +0200
Re: Why does vector::reserve() not grow exponentially ? Christian Gollwitzer <auriocus@gmx.de> - 2021-06-11 21:15 +0200
Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-11 21:58 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-12 04:11 +0200
Re: Why does vector::reserve() not grow exponentially ? Sam <sam@email-scan.com> - 2021-06-11 06:55 -0400
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-11 13:19 +0200
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-10 16:51 +0200
Re: Why does vector::reserve() not grow exponentially ? MrSpook_sw@08_cl170xu11o4f8xcg45.co.uk - 2021-06-10 15:25 +0000
Re: Why does vector::reserve() not grow exponentially ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-06-10 18:18 +0200
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-10 22:40 +0300
Re: Why does vector::reserve() not grow exponentially ? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-06-10 22:35 +0200
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-11 09:23 +0300
Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-11 12:02 +0200
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-11 03:05 -0700
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-11 03:22 -0700
Re: Why does vector::reserve() not grow exponentially ? "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-06-11 12:25 +0200
Re: Why does vector::reserve() not grow exponentially ? MrSpook_4421gcxq@fceufv2.ac.uk - 2021-06-11 11:39 +0000
Re: Why does vector::reserve() not grow exponentially ? MrSpook_3wcC2u9@cns8.net - 2021-06-11 10:18 +0000
Re: Why does vector::reserve() not grow exponentially ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-06-11 03:27 -0700
Re: Why does vector::reserve() not grow exponentially ? MrSpook_4bkzrb03@tu45utvus6nuc.tv - 2021-06-11 10:17 +0000
Re: Why does vector::reserve() not grow exponentially ? Manfred <noname@add.invalid> - 2021-06-11 13:22 +0200
Re: Why does vector::reserve() not grow exponentially ? MrSpook_0nG@p900whw6_n8r7ovwuul.ac.uk - 2021-06-11 11:34 +0000
Re: Why does vector::reserve() not grow exponentially ? Manfred <noname@add.invalid> - 2021-06-11 14:14 +0200
Re: Why does vector::reserve() not grow exponentially ? MrSpook_p_5Ko4g@21yhpi_n4fck_wfz.org - 2021-06-11 12:50 +0000
Re: Why does vector::reserve() not grow exponentially ? MrSpook_0sk4i3p@b1km5k73i1.edu - 2021-06-11 09:24 +0000
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-11 14:18 +0300
Re: Why does vector::reserve() not grow exponentially ? Bo Persson <bo@bo-persson.se> - 2021-06-11 11:59 +0200
Re: Why does vector::reserve() not grow exponentially ? MrSpook_jyc2xeWf9@aw55u6.gov - 2021-06-11 10:17 +0000
Re: Why does vector::reserve() not grow exponentially ? MrSpook_3dnim@5ooodqy.co.uk - 2021-06-11 09:19 +0000
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-11 14:26 +0300
Re: Why does vector::reserve() not grow exponentially ? MrSpook_35@s879vvmwpgee7rpqv.net - 2021-06-11 11:38 +0000
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-11 15:14 +0300
Re: Why does vector::reserve() not grow exponentially ? MrSpook_uQjuVe@5szcyauh_pjzi228wvwn.info - 2021-06-11 12:52 +0000
Re: Why does vector::reserve() not grow exponentially ? Paavo Helde <myfirstname@osa.pri.ee> - 2021-06-11 16:37 +0300
Re: Why does vector::reserve() not grow exponentially ? MrSpook_9fpRQm@i1z834r.net - 2021-06-11 14:58 +0000
Re: Why does vector::reserve() not grow exponentially ? Manfred <noname@add.invalid> - 2021-06-11 17:06 +0200
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