Re: RTLSetCriticalSpinCount slows program down

From:

"Bruno van Dooren [MVP VC++]" <bruno_nos_pam_van_dooren@hotmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Tue, 8 Aug 2006 17:55:00 +0200

Message-ID:

<evOECMwuGHA.4436@TK2MSFTNGP05.phx.gbl>

I have a program that reads some data of one file (in 64 Mb chunks), does
a conversion into another format, and writes it to another file.
I don't use threads or any of the Win32 APIs, just pure C++ and STL.

RTLSetCriticalSpinCount function at the top wasting over 60% of the cpu

seems like runtime is heavily synchronizing its own threads, funny as your
program, not having any threads, shoudn't really do that. Do you use COM
in this process (or any other implicitly created threads)? Can you switch
to single-threaded runtime (ML - it's no longer available in v. 2005)? If
it is 2005 , did you try building with define (option /D or search in
preprocessor options) _SECURE_SCL=0 ?

The OP is running a 32 bit executable on x64 windows.
perhaps this issue has something to do with doing IO through WOW, rather
than with the 32 bit executable itself?

--

Kind regards,
    Bruno van Dooren
    bruno_nos_pam_van_dooren@hotmail.com
    Remove only "_nos_pam"