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From: mitchalsup@aol.com (MitchAlsup1)
Newsgroups: comp.arch
Subject: Re: Is Parallel Programming Hard, And, If So, What Can You Do About
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Date: Mon, 19 May 2025 23:33:42 +0000
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On Mon, 19 May 2025 1:13:01 +0000, Lawrence D'Oliveiro wrote:

> On Mon, 19 May 2025 00:18:23 +0000, MitchAlsup1 wrote:
>
>> On Sun, 18 May 2025 1:35:54 +0000, Lawrence D'Oliveiro wrote:
>>
>>> For “recent”, let’s say “within the last 10 seconds”.
>>
>> Principle is reasonable, specified time is not.
>>
>> A 4MB cache can be filled in 1ms when memory performs at (only) 4GB/s
>> (and the memory systems are up in the 40GB/s peak territory while caches
>> remain rather small (several GB at most).)
>
> Filesystem cache turnover happens in times on the order of seconds, not
> milliseconds.

Yes, running at the latency and bandwidth of the disk/SSD subsystem
not of the DRAM system.