RFR: JDK-8316894: make test TEST="jtreg:test/jdk/..." fails on AIX

[Erik Joelsson]

On Wed, 27 Sep 2023 08:18:45 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> Running jtreg tests with make test, for example
> make test TEST="jtreg:test/jdk/java/util/prefs" fails currently on AIX without setting the number of JOBS manually.
> We get this error message:
> Error: Bad use of -concurrency
> 
> Log of cmdargs shows :
> -vmoption:-Xmx768m
> -agentvm
> -verbose:fail,error,summary
> -retain:fail,error
> -concurrency:7.000000
> ....
> 
> So currently a float is used for the concurrency value, seems this is not supported.
> Reason is an old gawk printing float values instead of the needed ints, so better print ints in the makefile by using %d .

As was pointed out in the bug, this changes the meaning of the expression to always round down rather than rounding to nearest integer, which was my intention when I originally added this logic. For higher cpu counts, this doesn't matter much, but for smaller systems, it can make a big difference if we run with 1 or 2 jobs.

To work around this, perhaps add `0.5` to c before converting to int?

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PR Comment: https://git.openjdk.org/jdk/pull/15941#issuecomment-1737782985