NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/lang/ada/3875

Internet Message Format | 1993-01-04 | 1.8 KB

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From: [e-mail] (Todd A Sorensen)
Newsgroups: comp.lang.ada
Subject: Re: CPU resources for embedded Ada programs
Message-ID: <[e-mail]>
Date: 4 Jan 93 21:33:34 GMT
References: <[e-mail]>
Organization: Honeywell Flight Management Systems
Lines: 21
Nntp-Posting-Host: madre
Nntp-Posting-User: tas

In article <[e-mail]>, [e-mail] (Doug Brown) writes:
> real-time Ada projects will require about 1 MB of RAM and 3 MIPS of CPU
> power for every 20 KLOC.
>

Our experience with 80960mc's and the Tartan compiler is about 10 to 11 bytes of
code and data per source line of code.  So for a 20 Ksloc program we need about
256K bytes of RAM and 256K bytes of ROM.  Horsepower needs are usually dependent
on the rates that the system requires and the processor loading that each of
those processes puts on the system. For example -- we have an older system that
has 200k + lines of Pascal but runs fine on a 800KIP machine.  All because we
allocated the processes and their priorities correctly.   A 3 MIP processor
would run the same system at the same rates, but it would be idle more, so we
could  bump up the rates at which the processes run to get better system
response.
--
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Todd A Sorensen               Honeywell Defense Avionics Systems Division
[phone]                internet: [e-mail]
                              fax: [phone]
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