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Re: [std-proposals] Fwd: set_new_handler extension

From: Phil Bouchard <boost_at_[hidden]>
Date: Mon, 27 Mar 2023 03:17:41 -0400
On 2/21/23 00:05, Thiago Macieira wrote:
> On Monday, 20 February 2023 19:31:16 PST Phil Bouchard wrote:
>>> Don't suspect. Prove it.
>> Prove what? Windows' code is proprietary.
> You don't need access to the source to prove the point. You just have to have
> a working application that, when run, shows the problem and has no reasonable
> other reason for having the behaviour in question than what your hypothesis
> is.
>>> This is the entire problem with this thread: you're suspecting a problem
>>> and jumped to a conclusion that is unwarranted by the facts presented.
>>> We've already twice shown that the problem was not where you thought it
>>> was, meaning it's very hard to take any argument you're making on trust
>>> alone now. You're oh-for-two now; you want a "third time is the charm"
>>> case, not "strike three" (mixing my metaphors here).
>> I just explained it crashes on both Windows 10 and 11 with 28x and 16x
>> Intel Core i9 using Visual Studio 2019 in 64 bits Release mode.
> And as your later email has just shown, the problem wasn't the allocator; it
> was that your application exhausted the address space of a 32-bit application
> (which on Windows is 2 GB; on 32-bit Linux it used to be 3 GB and in a 64-bit
> Linux kernel, the 32-bit application gets all 4 GB).
> You've twice now shown an application that fails to run for a reason that was
> not what you thought it was. Your hypothesis remains unproven.

So I did try all form of optimizations of OpenCV on Windows (TBB, Intel
IPP, OCL, ...) running just 3 intermittent threads synced every 33
milliseconds and the same cv::threshold function crashes before 3 hours.
The function is readonly also except from the resulting object!

Under Linux I run the exact same code more aggressively with no
optimization and using 12 continuous threads and it never crashes.

Unfortunately there is no big time memory sanitizer under Windows so I
still don't have a proof but if it looks and quacks like a duck then it
must be a duck.

I don't want to reopen this debate, but I was definitely on the right track.

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Received on 2023-03-27 07:17:44