Why very simple "Hello World" console application uses 4 threads? Is it because I have 4 core CPU? How can I (or should I) reduce the thread count to 1?
Here is the code:
int main()
{
std::cout << "Hello world";
return 0;
}
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5
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1What do the code do? – Emilio Pastor Mira Aug 19 '16 at 13:45
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Windows dll implementation. I don't think they can be a problem, but I don't know if and how reduce them – BiagioF Aug 19 '16 at 13:46
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You will get answer only when you show us your code. – Pranit Kothari Aug 19 '16 at 13:46
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this is system working threads pool – RbMm Aug 19 '16 at 13:46
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@RbMm: why 3 threads then? An odd number (no pun intended). – Violet Giraffe Aug 19 '16 at 13:47
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If you load symbols for those threads via the UI option, you'll see they are 'threadpool' threads waiting for work. Are they getting in your way? – Mike Vine Aug 19 '16 at 13:47
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Depending on what the application does you might not want to do that. Please define that "very simple console application", or post the source code. – Szőke Szabolcs Aug 19 '16 at 13:47
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Just prints "Hello World". :) – Narek Aug 19 '16 at 13:47
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@MikeVine: what are those threads for? Why 3 pool threads and not 4? – Violet Giraffe Aug 19 '16 at 13:48
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@Narek Using what.. MFC, Win32, std::cout? – Pranit Kothari Aug 19 '16 at 13:48
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2They're just an implementation detail on how windows app works. If you've got an actual problem with them (and also understand why you want to get rid of them) I'm sure someone will help you. – Mike Vine Aug 19 '16 at 13:50
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Confirmed with MSVC 2015 (v140 runtime) http://i.imgur.com/Cs77037.png?1 – Violet Giraffe Aug 19 '16 at 13:51
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1If you are really curious, get proper symbols and look at the stack traces of the threads. That may shed some light on what they are used for / doing. – Christian.K Aug 19 '16 at 13:54
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@Christian.K I think it is a duplicate, but could someone explain what thread pool we talk about and what .dlls when it is just a "Hello World". Why we need .dlls? – Narek Aug 19 '16 at 14:15
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I don't understand. There are many DLLs being linked to your process by default (some of which may do nasty things in their dllmain function - albeit maybe not the case here). IOW there is a lot more going on in your process then your main function (c runtime initializing as another example). And the default Windows thread pool is meant. – Christian.K Aug 19 '16 at 14:18