Slow performance Win7/64

[jojelino]

On 2011-07-27 오후 8:30, Heiko Elger wrote:
> So the question is:
>
> Is it a known problem?
> Is it really OS (Win7) specific?
i'm not win7/64 user but i can count same timestamp per seconds as 17.
and attached file is gprof result when executed your testcase. (but not 
same dll from above. it has 2.42(17/7)x slowdown. so you would need to 
consider slowdown factor. from now i assume you are considering slowdown 
factor)
and as we can see, the waitpid takes about 140ms and in gprof report of 
date.exe, you can see sig_{dispatch_pending,send} consumes almost third 
quarter time.
actually, the unwoken wait_sig thread(because sigproc_init is called 
during DLL_PROCESS_ATTACH of dll_entry) is waken by sig_dispatch_pending 
call.
the problem is, it takes about 10ms to wake wait_sig thread in my 
pc.(surely main thread does nothing) and gprof report it has slowdown 
indeed.
so i think this is known problem, and it would be not only win7 specific 
problem. as we can confirm there is delay to wake wait_sig thread. 
although i can't make sure it is dominating factor.
>
> Why is this problem not solved - cause it is to difficult to find? Yes I know
> it's open source and I'm a programmer too - but I'm realy not a programmer
> having the knowledge of Cygwin internal details.
>
> Is there a workaround for that problem?
> Any hints are welcome.
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