Hi Eric,
I don't receive gigabytes at once. I have multiple serial lines using a
RS485 similar communications method (Master - Slave). The peers can be
up to 1KM away. Each line can have up to 50 peers. Each peer is
interrupted when it's 9-bit address is called and it starts
communicating. All peers are remote from each other but are one system
that must work synchronized. The large RAM usage is because the DOS
program (the big boss) must make fast decisions depending on things that
can have happened some time ago. Also, many peers have so little memory
that most of their status is stored by the DOS program and must be
available at any time. A disk is too slow.
On 13/01/2021 15:51, Eric Auer wrote:
Hi Andreas,
how do you manage to receive gigabytes of data from a
few dozen peers with mere megahertz of CPU clock rate?
What are the chances to reduce server RAM footprint?
Regards, Eric
I still use DOS to this day in an industrial setting...
hundreds of remote machines with tens of embedded devices...
running at 2MHz that must interpret and respond to complex communication
protocols without sacrificing the job they really need to do...
With DOS on a modern machine I can handle dozens of these communications
in real time with nano-second turnaround times...
However, to improve speed I also keep a lot of data in memory. One core
with unlimited RAM will run circles around multiple cores with not
enough RAM, and at one client I am already getting close to 2GB...
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