Commits on Oct 21, 2014

1. enable parallel codegen by default …

   Enable parallel codegen (2 units) by default when --opt-level is 0 or 1.  This
   gives a minor speedup on large crates (~10%), with only a tiny slowdown (~2%)
   for small ones (which usually build in under a second regardless).  The current
   default (no parallelization) is used when the user requests optimization
   (--opt-level 2 or 3), and when the user has enabled LTO (which is incompatible
   with parallel codegen).
   
   This commit also changes the rust build system to use parallel codegen
   when appropriate.  This means codegen-units=4 for stage0 always, and
   also for stage1 and stage2 when configured with --disable-optimize.
   (Other settings use codegen-units=1 for stage1 and stage2, to get
   maximum performance for release binaries.)  The build system also sets
   codegen-units=1 for compiletest tests (compiletest does its own
   parallelization) and uses the same setting as stage2 for crate tests.

   

   spernsteiner authored and pcwalton committed Oct 21, 2014
   5 Configuration menu

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