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From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups: comp.lang.c++
Subject: Re: Sieve of Erastosthenes optimized to the max
Date: Sun, 24 Mar 2024 13:05:12 -0700
Organization: A noiseless patient Spider
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In-Reply-To: <utq0os$ibqn$1@raubtier-asyl.eternal-september.org>

On 3/24/2024 1:00 PM, Bonita Montero wrote:
> Am 24.03.2024 um 20:52 schrieb Chris M. Thomasson:
>> On 3/23/2024 11:30 PM, Bonita Montero wrote:
>>> Am 23.03.2024 um 22:04 schrieb Chris M. Thomasson:
>>>> On 3/23/2024 9:54 AM, Bonita Montero wrote:
>>>>> Am 23.03.2024 um 03:34 schrieb Chris M. Thomasson:
>>>>>> On 12/26/2023 9:06 PM, Bonita Montero wrote:
>>>>>>> Am 26.12.2023 um 21:24 schrieb Chris M. Thomasson:
>>>>>>>
>>>>>>>> So, are you familiar with Intel's early hyper threading problem?
>>>>>>>> There was false sharing between the ...
>>>>>>>
>>>>>>> False sharing can only happen between different cores.
>>>>>>
>>>>>> Sigh.
>>>>>
>>>>> Why ? Do you think false sharing can happen between the threads
>>>>> of a single core ?
>>>>>
>>>>
>>>> Sigh again...
>>>
>>> On a single core CPU with two thread's there's never false sharing.
>>>
>>
>> Whatever you say man... ;^o
> 
> You said:
> 
>  > So, are you familiar with Intel's early hyper threading problem? 
> There was false sharing between the hyperhtreads.
> 
> False sharing is a kind of cache thrashing, but not every cache
> thrashing is false sharing. False sharing can only happen between
> different cores and the Pentium 4 HT does only have one core.
> 

Yawn...