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Diffstat (limited to 'schulung_tools/rtex/README.txt')
| -rw-r--r-- | schulung_tools/rtex/README.txt | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/schulung_tools/rtex/README.txt b/schulung_tools/rtex/README.txt deleted file mode 100644 index ce33bcf..0000000 --- a/schulung_tools/rtex/README.txt +++ /dev/null @@ -1,46 +0,0 @@ -The rtex program demonstrates the importance of using several tricks to -avoid page faults and memory allocation during critical runtime. It displays -the amount of time taken and generated page faults when performing various -tasks. This clearly shows the expense due to page faults. - -Running the program without any (or invalid) arguments shows the usage -help. The program argument specifies which rt tweak should be performed -and if the runtime tests should be performed. - -The tests can be performed on any Linux system (embedded, desktop, server, -with or without PREEMPT_RT). The results will be the same. - -The following is a summary of the most important results: - -running the test without any rt tweaks - - main setup very fast - - first big malloc+access very expensive - - second big malloc+access very expensive - - first big stack very expensive -$ sudo ./rtex 0x10 -options: 0x10 - 5715 ns 0 faults : main setup - 17466150 ns 2561 faults : testfunc_malloc (0) - 14963662 ns 2560 faults : testfunc_malloc (1) - 2517772 ns 0 faults : testfunc_malloc (2) - 2577208 ns 0 faults : testfunc_malloc (3) - 6113558 ns 1847 faults : testfunc_deepstack (0) - 390386 ns 0 faults : testfunc_deepstack (1) - 321146 ns 0 faults : testfunc_deepstack (2) - 317585 ns 0 faults : testfunc_deepstack (3) - -running the test with all rt tweaks - - main setup very slow (does it really matter?) - - no expensive malloc+access calls - - no expensive big stacks -$ sudo ./rtex 0x1f -options: 0x1f - 31276098 ns 7083 faults : main setup - 2657466 ns 0 faults : testfunc_malloc (0) - 2519973 ns 0 faults : testfunc_malloc (1) - 2543506 ns 0 faults : testfunc_malloc (2) - 2750682 ns 0 faults : testfunc_malloc (3) - 526604 ns 0 faults : testfunc_deepstack (0) - 324543 ns 0 faults : testfunc_deepstack (1) - 318580 ns 0 faults : testfunc_deepstack (2) - 317265 ns 0 faults : testfunc_deepstack (3) |