3.1. User process models on AIX

Starting with AIX Version 4.3, AIX supports two user process models, 32- and 64-bit, which we explain in the following sections:

  • Section 3.2, “The 32-bit user process model” on page 109

  • Section 3.3, “The 64-bit user process model” on page 130

Before explaining these models in detail, we provide a short introduction in this section. As shown in Figure 3-1, there are four combinations of kernel and hardware support of 32- and 64-bit support.

Figure 3-1. Hardware, kernel, and user process relationships

If the hardware bit mode is 32-bit, then 64-bit user processes cannot run on the 32-bit kernel (represented as ...

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