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From: <midrangel@xxxxxxxxxxxxxxxxx>the
To: "'Web Enabling the IBM i \(AS/400 and iSeries\)'"
<web400@xxxxxxxxxxxxxxxxxx>
Date: 05/10/2021 10:55 AM
Subject: [EXTERNAL] Re: [WEB400] IWS REST API performance questions
Sent by: "WEB400" <web400-bounces@xxxxxxxxxxxxxxxxxx>
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
biggest effect on this type of transaction. Rarely CPU becomes abottleneck
if the transactions are complicated, so I suggest you make the REST APIdo
as little as possible and push the bulk of the processing to asynchbatch
(data queue ??)Cookson
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 <web400-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Kelly
via WEB400well. I
Sent: Monday, May 10, 2021 9:56 AM
To: web400@xxxxxxxxxxxxxxxxxx
Cc: Kelly Cookson <KCookson@xxxxxxxxxxxx>
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
have heard from more than one person that shops have achieved goodgood
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
performance.relatively
1. If achieving good performance with IWS REST APIs requires a
big IBM i or additional partitions for conceptual load balancing orhardware,
something else that might involve significant new investments in
then I would like to know this. This would not necessarily be aknow
deal-breaker. But I would like to know what to expect in advance. (I
this is hard to answer without the specifics of our system. I am lookingfor
a general description of what size/configuration of an IBMi system isneeded
to handle a high volume of REST API requests-defining high volumehowever
you want-with good performance.)Programming
2. I know the "Integrated Web Services Server Administration and
Guide" contains suggestions for performance tuning. However, most of theoptimize
suggestions involve things that are new to us. if we need help to
the various performance tuning options mentioned in the programmingguide,
where can we turn to for more detailed help? Can we get help from IBM,for
example?
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