[Info-vax] Any chance Perfecttune Perfectfile Perfectdisk will be ported to x86?

[etmsreec at gmail.com]

On Monday, 27 May 2019 02:01:37 UTC+1, Dave Froble  wrote:

> 
> VMS already has caching, and it works quite well.  We configure with 
> lots of memory.  Enough cache to contain all the data files.  Not saying 
> that always happens.
> 
> Not much benefit from contiguous files on a SSD.  Some, but not anywhere 
> near as on a disk.
> 
> The RMS file internals usually benefit from optimization.  Used to do 
> some of that.  Don't miss it at all.
> 

Unless things have changed, VMS' own caching isn't able to retain cluster coherency of caching, so will stop caching a file that's open on more that one node in a cluster.  Only open a file in one place, you're fine.  Open it on another node, and caching stops as someone else might have updated the file.

When I last looked at it, about ten years ago, PerfectCache was able to retain coherency, but was not able to co-exist with FastPath.  I presume it must have been sat watching for IO lock traffic and keeping other nodes up to date with what was being transferred that way.

Steve