3.3. How Linux fits the mainframe

Once Linux was ported to the mainframe, it turned out that its behavior on this platform was quite good. In fact, with Linux on the mainframe, you can:

  • Scale with the workload

  • Utilize CPU power

3.3.1. Scale with the workload

It has been claimed by some experts in the industry that Linux running on systems with multi-CPU capability does not scale well. What would be the point in running Linux on a large mainframe with multiple CPUs? Performance measurements, however, clearly show that many Linux applications on a mainframe scale well.

Figure 3-2 illustrates a scalability experiment with a business intelligence workload performed on an IBM zSeries processor. When adding copies of the workload (up to eight), the ...

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