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prino

Senior Member


Joined: 07 Feb 2009
Posts: 1287
Location: Vilnius, Lithuania

PostPosted: Wed Jan 19, 2022 4:11 pm
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Setting the record straight

Or "What not to do on a z/OS (MVS) system"
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steve-myers

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Joined: 30 Nov 2013
Posts: 917
Location: The Universe

PostPosted: Sun Jan 23, 2022 3:36 am
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Over the years I've done Sieve of Eratosthenes for prime numbers. One time I did it on a 370/165. A little later we went to an IBM data center to try some of our applications on VS2 Release 1, otherwise known as SVS. My mouth watered (in a manner of speaking) at trying it with a really large sieve, so I took it along.

Our applications all seemed to run OK until I started my little program with a really large sieve. The machine immediately started doing I/O, so I canceled the job. I realized the I/O was paging; I don't recall how much real storage the machine had; I could get enough virtual storage for my sieve, but it was obvious I could not get enough real storage. Sigh.
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