This variable enables Symmetric Multi-processing (SMP) on systems # with multiple CPU's or that support hyperthreading. Performance will # be improved in certain Parasolid operations, such as Mass Properties, # Booleans and silhouette generation. This option is only supported on # platforms where Parasolid supports multi-threading. # # Set to 0 to disable SMP # Set to 1 to enable SMP 按上面所说的选1就能打开smp，以前进去看了之后发现本来默认就是1，但根本感觉不出双核的效果，cpu一直是处于50%的状态。
