So Java not only will run anywhere but can be expected to get same answers everywhere
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As long as use of Native (C, Fortran) libraries and indeterminate concurrency controlled
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Natural tension between performance (both in terms of speed and precision) and reproducibility
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Need to encourage more research into "reproducible algorithms" but support both goals
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Java has particularly bad floating point performance due to
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As in all applications, immature compiler (JIT) technology
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does not exploit proprietary hardware features (extended precision, fused multiply add)
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does not allow well known compiler optimizations (associativity)
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Solution requires "Change in Java Rules" and better compilers
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