[MacPorts] #58932: py-tensorflow: reduce build time

[MacPorts]

#58932: py-tensorflow: reduce build time
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  Reporter:  ryandesign     |      Owner:  emcrisostomo
      Type:  enhancement    |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  py-tensorflow  |
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Comment (by ryandesign):

 Taking a look at the [attachment:py39-tensorflow1-10.13.png Activity
 Monitor on the 10.13 buildbot worker] during
 [https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/106390
 this build of py39-tensorflow1] which has taken 6 hours so far, I see that
 it is swapping because the VM has 8 GB RAM and 8 cores and there are 5
 clang processes and one java process started occupying a total of 10.7 GB
 of virtual memory. The build is starting too many RAM-hungry processes.
 Since it is known that the build uses more RAM per compiler process than
 MacPorts estimates, the build should reduce the number of jobs as I
 suggested in comment:6.

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Ticket URL: <https://trac.macports.org/ticket/58932#comment:15>
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