I'm fairly certain the reason for hanging/failure was the server process dying and the client ZMQ socket waiting for reconnection. If that's the case the test will never actually complete and should be considered failed as soon as the server process dies.
However, if you want to try to increase the time out you can install the pytest-timeout plugin and it enables the cmd line arg --timeout=300 where the value is in seconds. An alternative is to try and use pytest marks to set something on a specific test @pytest.mark.timeout(10, "slow", method-"thread") (from the pytest docs)
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During your first run you should have gotten a message from gasnet recommending a value for GASNET_PHYSMEM_MAX. This is usually ~2/3 of physical memory or a limit set by the HCA. This limits how much memory can be pinned, but not how much physical memory you can allocate (just how much can be pinned / communicated at any given time).
The amount the server reports comes from https://chapel-lang.org/docs/modules/standard/Memory/Diagnostics.html#Diagnostics.locale.physicalMemory, which should just be the physical memory of a system. Can you run free -g on the nodes to verify the OS reports ~750G and not ~512G?
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CHPL_TARGET_CPU (https://chapel-lang.org/docs/usingchapel/chplenv.html#chpl-target-cpu) basically controls CPU specialization (march in gcc). It defaults to unknown for multi-locale since we don't if chapel is cross-compiling. If your login node is the same ISA as compute nodes you could set it to native. Otherwise, setting to none will quiet the warning (though that will probably trigger a rebuild). In all the tests we've done Arkouda performance does not benefit from target architecture specialization at the moment, so leaving it unknown or setting it to none should not impact performance.