Groups > comp.programming.threads > #1514

Re: Thread scaling in Windows [SOLVED]

Newsgroups	comp.programming.threads
Subject	Re: Thread scaling in Windows [SOLVED]
From	Paavo Helde <myfirstname@osa.pri.ee>
References	(1 earlier) <51a7c499$0$6565$9b4e6d93@newsspool4.arcor-online.net> <XnsA1D1132254871myfirstnameosapriee@216.196.109.131> <4fegq89mvs3l3k3apo1onv40ls0t6av4vh@4ax.com> <XnsA1D2CE07A916Bmyfirstnameosapriee@216.196.109.131> <XnsA1D38FAF84B9myfirstnameosapriee@216.196.109.131>
Organization	PKI
Message-ID	<XnsA1D4CB7C99154myfirstnameosapriee@216.196.109.131> (permalink)
Date	2013-06-03 12:00 -0500

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Paavo Helde <myfirstname@osa.pri.ee> wrote in
news:XnsA1D38FAF84B9myfirstnameosapriee@216.196.109.131: 

> Paavo Helde <myfirstname@osa.pri.ee> wrote in
> news:XnsA1D2CE07A916Bmyfirstnameosapriee@216.196.109.131: 
> 
>> Robert Wessel <robertwessel2@yahoo.com> wrote in
>> news:4fegq89mvs3l3k3apo1onv40ls0t6av4vh@4ax.com: 
>> 
>>> 
>>> Memory management can be an area of quite high lock contention,
>>> particularly in C++ code with many "new"s being executed.  Plugging
>>> something like SmartHeap into your application is a simple fix if
>>> that's a problem.
>> 
>> I'm suspecting more and more that the memory allocator might be the
>> culprit indeed. The screenshot of task managers at the SmartHeap home
>> page exactly matches our experience. And we have lots and lots of
>> small memory allocations.

With the next memory allocator I tried (Intel TBB) the problem on Windows 
appears to be mostly solved, now the program scales much more nicely and 
gets about 8x speedup with 12 worker threads. After that it seems the 
hyperthreading penalty kicks in so that the max speedup (with 24 threads) 
is only 10.5 times (it has 12 physical cores (with HT, 24 logical 
cores)).

The scaling is still worse than in Linux, but this is compensated by that 
MSVC seems to be able to do better job in optimizations than gcc so that 
the absolute test times are actually better in Windows than in Linux for 
all tests up to 24 threads.

Thanks to all who answered and shared ideas and advice!

Paavo

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Thread

Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-05-29 12:31 -0500
  Re: Thread scaling in Windows Robert Miles <robertmilesxyz@gmail.com> - 2013-05-29 17:26 -0700
    Re: Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-05-30 16:11 -0500
      Re: Thread scaling in Windows Gerald Breuer <Gerald.Breuer@googlemail.com> - 2013-05-31 03:44 +0200
        Re: Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-05-31 00:29 -0500
  Re: Thread scaling in Windows Marcel Müller <news.5.maazl@spamgourmet.org> - 2013-05-30 23:28 +0200
    Re: Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-05-30 17:52 -0500
      Re: Thread scaling in Windows Melzzzzz <mel@zzzzz.com> - 2013-05-31 04:18 +0200
      Re: Thread scaling in Windows Robert Wessel <robertwessel2@yahoo.com> - 2013-05-31 01:11 -0500
        Re: Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-06-01 12:15 -0500
          Re: Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-06-01 16:52 -0500
            Re: Thread scaling in Windows [SOLVED] Paavo Helde <myfirstname@osa.pri.ee> - 2013-06-03 12:00 -0500
              Re: Thread scaling in Windows [SOLVED] Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> - 2013-06-04 08:16 +0000
              Re: Thread scaling in Windows [SOLVED] Noob <root@127.0.0.1> - 2013-06-04 10:25 +0200
      Re: Thread scaling in Windows Marcel Müller <news.5.maazl@spamgourmet.org> - 2013-05-31 15:53 +0200
        Re: Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-05-31 12:57 -0500
          Re: Thread scaling in Windows Marcel Müller <news.5.maazl@spamgourmet.org> - 2013-05-31 22:59 +0200
            Re: Thread scaling in Windows Paavo Helde <myfirstname@osa.pri.ee> - 2013-06-01 03:06 -0500
              Re: Thread scaling in Windows Marcel Müller <news.5.maazl@spamgourmet.org> - 2013-06-01 15:20 +0200
                Re: Thread scaling in Windows Drazen Kacar <dave@fly.srk.fer.hr> - 2013-06-02 06:35 +0000
            Re: Thread scaling in Windows Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> - 2013-06-01 12:34 +0000
              Re: Thread scaling in Windows Marcel Müller <news.5.maazl@spamgourmet.org> - 2013-06-01 15:09 +0200
                Re: Thread scaling in Windows Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> - 2013-06-01 17:12 +0000

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