[Info-vax] ADA and VMS (was Safer programming languages)

[Arne Vajhøj]

On 11/15/2021 6:28 PM, Bill Gunshannon wrote:
> On 11/15/21 4:18 PM, Robert A. Brooks wrote:
>> On 11/15/2021 4:01 PM, Bill Gunshannon wrote:
>>> This talk of Ada, VMS and Systems programming has raised a new
>>> question in my mind.
>>>
>>> Given that Ada got it's start on VMS (one of the first validated
>>> Ada Compilers was on VMS) has any attempt ever been made to write
>>> any part of VMS using Ada?  Device Driver? Anything?
>>
>> ACME_SERVER and SECURITY_SERVER are written in ADA.
>>
>> Both are being rewritten in C.
> 
> Were there ever any internal benchmarks run against them so that
> a comparison of performance when the C conversion is done could
> be looked at?

Depending on how many checks were disabled in the Ada version, then
the C version may be a little or a lot faster,

But I cannot imagine it having any significance on modern hardware.

They did not rewrite in C to save CPU cycles but because they did
not have an Ada compiler for the new platform.

Arne