By Günther Färber, Julia Kirchner
If youd wish to the best way to software your first executable ABAP purposes, then this ebook is your perfect better half. even if youre already conversant in one other programming language, youll make the most of straight forward motives and step by step guide to successfully grasp the fundamentals of programming business-critical functions with ABAP.
Comprehensive, easy-to-follow descriptions introduce you to every of the appropriate suggestions and an ongoing useful state of affairs that maintains through the booklet guarantees that you just get yourself up to speed with all significant parts of ABAP improvement. various step by step techniques, screenshots, and answer suggestions are hired through the authors to explain procedural and object-oriented language components in a transparent and easy-to-understand manner. In each one bankruptcy, youll additional expand the pattern software, permitting you to construct the abilities had to simply reproduce the advance of a accomplished ABAP program - together with all of its difficult info.
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Additional info for ABAP Basics
Was the speed difference just an arti‐ fact, or was it really faster? If each experiment run is documented, it can quickly be repeated. This makes answer‐ ing such questions trivial. Otherwise, the developer must go back and rerun a previ‐ ous experiment to get the timing—that is, if he can remember exactly what code change to make or unmake. If runs are brief and the developer’s memory is excellent, then he’s lucky and may waste only a little time. But it is possible to be unlucky too, and lose track of a promising line of work, or maybe repeat it unnecessarily the next day.
When an execution unit requests bytes from a cached mem‐ ory word, the bytes may be fetched rapidly without accessing main memory again. How much faster is cache memory? A rule of thumb is that each level of cache mem‐ ory is about 10 times faster than the one below it in the memory hierarchy. On desktop-class processors, the time cost of a memory access can vary across five orders of magnitude depending on whether the data being accessed is in first-, second-, or third-level cache, in main memory, or on a virtual memory page on disk.
Figure 3-1. The Fluke 9010A (British Computer History Museum) There was a function that polled the keyboard to see whether the STOP key had been pressed. This function was executed frequently by every routine. Hand-optimizing the C compiler’s Z80 assembly language output code for this one function (a 45minute task) improved overall throughput by 7%, which was a big deal in this partic‐ ular device. This experience was typical of optimization efforts in general. At the beginning of the optimization process, a lot of run time was spent in one place in the program.