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io buffer sizes

RavenByronRavenByron EntrantInactive User Role Beginner
So doing some research I found a bunch of old 2007-2010 article talking about io buffers (read_buffer_size and others) and the performance change around 128k when they change from molloc to mmap. I was wondering if there is any updated info on this? And if in virtualized environments this changes at all etc. I would love to see a new blog that deep dives into this.
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