[Info-vax] RMS and SSIO (again)

[Simon Clubley]

On 2022-01-12, Greg Tinkler <tinklerg at gmail.com> wrote:
>> One of the people who created SSIO now has been working on RMS since 1975 (member of the initial VMS design team :) 
>> Another example is Ruth Goldenberg, she came up with part of the SSIO design.
> Good to know, pity they did not see this solution.  But to restate what I said before, byte to XFC is a good thing particularly if it integrated into RMS, i.e. have XFC do the buffering for RMS.
>
>> > Also after 17 years and it still not working don't you think it is time to move on, and just fix CRTL. NB I have also stated that RMS should be fixed but until then the work around I have suggested to a good fit.
>> Current status - SSIO works well and is in the field test phase. It's simple, fast, and fixes the problem for everyone, not just CRTL users.
> Apparently so, but no one has refuted that SSIO is NOT cluster safe, whereas the CRTL/RMS change is.
>
>> The options for fixing this problem in CRTL that I know are complex and slow. Maybe your hack is quick and easy, I haven't looked at it carefully yet.
> This is where we disagree,  complex no, actually will probably simplify the code.  If the changes to RMS are also done then even less complexity for CRTL.
>
> What changes would I like to RMS, particularly with regards tp XFC.
> - change $READ/$WRITE to use the MBC/Bucket buffers that RMS has, which would be XFC
> - change $READ/WRITE so they use byte offset.  NB this is possible without change the RAB, just by adding a ROP (byteoffset) and using all the space available for RFA, i.e. RAB$Q_RFA.
> - fix $FIND so it will work with UDF files, so that $UPDATE can work without having the read data
> - use the $ SET RMS values to directly impact XFC, block size/buffer/...
> - and the list goes on, and has been around for decades
>

Let's assume for one moment that you could magically find a viable
solution that everyone else had missed. (Which I don't really believe,
but let's assume it anyway).

Question: What would be the overhead of going through RMS using
your solution instead of just using SSIO ?

IOW, how much slower would it be to go through RMS instead of
going through SSIO ?

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.