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тАО04-16-2007 06:54 PM
тАО04-16-2007 06:54 PM
is there any command to find this out. i have a application which was supported in OpenVMS Alpha V7.3-2. now i tried the same application in OpenVMS 8.2 & it looks like working. but is there any other constraint or short-comings for doing this.
Appreciate if you could comment on this!!
Solved! Go to Solution.
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тАО04-16-2007 07:03 PM
тАО04-16-2007 07:03 PM
Re: Processor Information for OpenVMS Alpha 8.2
VMS will not change that.
> is there any other constraint or
> short-comings for doing this.
Do you really want someone who has not seen
your program to tell you if it will work
correctly on VMS V8.2? Ok. Of course it
will work correctly. What could go wrong?
Have you thought about running some tests?
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тАО04-16-2007 07:12 PM
тАО04-16-2007 07:12 PM
Re: Processor Information for OpenVMS Alpha 8.2
Normally 64-bit architecture is backward compatible to 32-bit applications( exceptions may be there). and i think this the issue that i face now. i haven't run any test, but there may be a chance that it would fail for some certain test right!!!
thanks,
Manesh
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тАО04-16-2007 07:19 PM
тАО04-16-2007 07:19 PM
SolutionOpenVMS Alpha V8.2 is. What kind of
32-bit/64-bit differences do you fear?
Whenever the OS changes, whether it's a patch
or an upgrade, or the installation of some
other new product, it's possible that an
application will be affected. In this case,
it's not very likely.
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тАО04-16-2007 07:20 PM
тАО04-16-2007 07:20 PM
Re: Processor Information for OpenVMS Alpha 8.2
Well-written, well-behaved user mode programs that were developed on an older release of OpenVMS rarely cause trouble on newer releases.
OTOH, if you have written kernel mode code, or used undocumented features, I suggest you recompile and relink on the newer version of OpenVMS and perform some serious testing.
Btw, normal, well-written, well-behaved user programs tend to be 32-bit (still).
Regards,
Kris (aka Qkcl)
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тАО04-16-2007 07:27 PM
тАО04-16-2007 07:27 PM
Re: Processor Information for OpenVMS Alpha 8.2
actually i was in a assumption that OpenVMS 7.3-1 & 7.3-2 had 32-bit architecture and the newer 8.2 had 64-bit architecture. thats y i raised this as a concern. i didn't know that the entire OpenVMS Alpha machine are 64-bit..
thanks to everyone.
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тАО04-16-2007 07:36 PM
тАО04-16-2007 07:36 PM
Re: Processor Information for OpenVMS Alpha 8.2
> user programs tend to be 32-bit (still).
That's a little over-simple. It depends on
what you mean by "32-bit". For a C program:
CC /POINTER_SIZE affects some things.
Various "#pragma" directives affect some
things.
The macro "_LARGEFILE" affects some things.
The programmer can affect almost anything.
> i didn't know that the entire OpenVMS Alpha
> machine are 64-bit..
That much is certainly true. It's also true
that moving a program to an _older_ version
of VMS may cause problems if it uses new VMS
features. Moving a program to a newer VMS
version is usually pretty safe, depending on
exactly what the program does.
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тАО04-16-2007 11:50 PM
тАО04-16-2007 11:50 PM
Re: Processor Information for OpenVMS Alpha 8.2
Summarily:
VAX/[Open]VMS is 32 bit for all VAX,
alpha/OpenVMS is 64 bit for all alpha.
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тАО04-17-2007 01:14 AM
тАО04-17-2007 01:14 AM
Re: Processor Information for OpenVMS Alpha 8.2
Purely Personal Opinion
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тАО04-17-2007 01:48 AM
тАО04-17-2007 01:48 AM
Re: Processor Information for OpenVMS Alpha 8.2
First things first. All Alpha processors are 64-bit RISC.
The Alphaserver 1000 that was referenced uses an EV4 processor. There are some improvements in later generation chips, but they these improvements are not incompatible with code generated for earlier generations of chips.
In general, non-privileged programs should run on later releases without problems.
- Bob Gezelter, http://www.rlgsc.com