Default BLAS3_MEM_ALLOC_THRESHOLD on all platforms to 32 #2879
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This was referenced Oct 17, 2020
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and make it more easily available for configuration.
The rationale for this is that the previous rather arbitrary default of 160 implies a stack of 8192k as usual on Linux/Unix systems, but any inclusion of the Java VM at runtime will impose the Java limit of 1024k unless the caller is aware of this and adjusts the Java environment settings accordingly.
Small embedded systems might be similarly constraint due to general hardware limitations even without Java.
Fixes #2839 , #2821 and #2030 - probably the cause of #1936 as well