Re: IWS REST API performance questions

As you might guess the best answer to all your questions is: "It
depends".....

Generally we see memory footprint and proper use on shared pools to have the
biggest effect on this type of transaction.  Rarely CPU becomes a bottleneck
if the transactions are complicated, so I suggest you make the REST API do
as little as possible and push the bulk of the processing to asynch batch
(data queue ??)  

The thing we see most often in these situations are network bottlenecks.
DNS look ups take too long, firewall rules that cause things to bounce
around, too slow of an internet connection, poorly configured line
descriptions, etc..   

--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: WEB400 <[email protected]> On Behalf Of Kelly Cookson
via WEB400
Sent: Monday, May 10, 2021 9:56 AM
To: [email protected]
Cc: Kelly Cookson <KCookson-EAwJ3jYHSpVWk0Htik3J/[email protected]>
Subject: [WEB400] IWS REST API performance questions

We may adopt IWS REST APIs in our shop. However, I have concerns about
performance. I am *not* concerned that IWS REST APIs cannot perform well. I
have heard from more than one person that shops have achieved good
performance with IWS APIs at high volumes of requests. I assume it is
possible to get the kind of performance we want from IWS REST APIs.

The question is whether or not *our shop* will be able to achieve that good
performance.

1. If achieving good performance with IWS REST APIs requires a relatively
big IBM i or additional partitions for conceptual load balancing or
something else that might involve significant new investments in hardware,
then I would like to know this. This would not necessarily be a
deal-breaker. But I would like to know what to expect in advance. (I know
this is hard to answer without the specifics of our system. I am looking for
a general description of what size/configuration of an IBMi system is needed
to handle a high volume of REST API requests-defining high volume however
you want-with good performance.)

2. I know the "Integrated Web Services Server Administration and Programming
Guide" contains suggestions for performance tuning. However, most of the
suggestions involve things that are new to us. if we need help to optimize
the various performance tuning options mentioned in the programming guide,
where can we turn to for more detailed help? Can we get help from IBM, for
example?

Thanks,

Kelly Cookson
Senior Software Engineer II
Dot Foods, Inc.
1-217-773-4486  ext. 12676
www.dotfoods.com<http://www.dotfoods.com>

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