HowTo - Compilazione Kernel Real Time - Parte 4

Installazione

Se tutto è andato liscio nella nostra Home ci ritroveremo due file linux-headers-2.6.33.2-rt13-CustomRT.deb e linux-image-2.6.33.2-rt13-CustomRT.deb. L'installazione può essere fatta anche da interfaccia grafica, semplicemente facendo doppio click sul file linux-image-2.6.33.2-rt13-CustomRT.deb, al termine dell'installazione installiamo anche l'headers linux-headers-2.6.33.2-rt13-CustomRT.deb.

Se tutto è andato per il meglio riavviando il sistema durante il boot, Grub ci presenterà la possibilità di avviare il sistema con il nuovo kernel realtime. Facciamo ora alcuni test per verificare la reale efficienza del nuovo kernel real time.

Alcuni test

Grazie al pacchetto software SysBench(http://sysbench.sourceforge.net) è possibile eseguire test su CPU, RAM, Theads, Performance del disco... sullo stesso PC avviandolo prima con il kernel configurato di default e poi con quello Real Time. Di seguito i risultati del nostro test:

Kernel vanilla (default) 2.6.28-11-generic	Kernel RealTime 2.6.33.2
antonio@antonio-desktop:~$ sysbench --num-threads=20 --test=cpu run sysbench 0.4.10: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 20 Doing CPU performance benchmark Threads started! Done. Maximum prime number checked in CPU test: 10000 Test execution summary: total time: 21.9421s total number of events: 10000 total time taken by event execution: 436.5217 per-request statistics: min: 4.18ms avg: 43.65ms max: 276.19ms approx. 95 percentile: 140.17ms Threads fairness: events (avg/stddev): 500.0000/50.28 execution time (avg/stddev): 21.8261/0.10	antonio@antonio-desktop:~$ sysbench --num-threads=20 --test=cpu run sysbench 0.4.10: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 20 Doing CPU performance benchmark Threads started! Done. Maximum prime number checked in CPU test: 10000 Test execution summary: total time: 21.3002s total number of events: 10000 total time taken by event execution: 425.1002 per-request statistics: min: 4.22ms avg: 42.51ms max: 98.23ms approx. 95 percentile: 60.25ms Threads fairness: events (avg/stddev): 500.0000/10.16 execution time (avg/stddev): 21.2550/0.02
antonio@antonio-desktop:~$ sysbench --num-threads=20 --test=threads run sysbench 0.4.10: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 20 Doing thread subsystem performance test Thread yields per test: 1000 Locks used: 8 Threads started! Done. Test execution summary: total time: 9.7286s total number of events: 10000 total time taken by event execution: 193.7196 per-request statistics: min: 0.35ms avg: 19.37ms max: 235.93ms approx. 95 percentile: 74.65ms Threads fairness: events (avg/stddev): 500.0000/46.77 execution time (avg/stddev): 9.6860/0.10	antonio@antonio-desktop:~$ sysbench --num-threads=20 --test=threads run sysbench 0.4.10: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 20 Doing thread subsystem performance test Thread yields per test: 1000 Locks used: 8 Threads started! Done. Test execution summary: total time: 8.4843s total number of events: 10000 total time taken by event execution: 169.3573 per-request statistics: min: 0.49ms avg: 16.94ms max: 98.36ms approx. 95 percentile: 43.27ms Threads fairness: events (avg/stddev): 500.0000/34.36 execution time (avg/stddev): 8.4679/0.01

In giallo sono evidenziati le più rilevanti differenze di prestazioni tra il Kernel Real Time e il Vanilla.

Spero che questo post sia utile.

Grazie a tutti per l'attenzione.