That is a normal thing. sim_second is a workload related parameter while simulation execution on the host is related to your host, e.g wall time.
Assume you are simulating single core at 2GHz frequency. As a result simulating 1 second of your workload takes 2*10^9 cycles. If you write a good code in gem5, it may takes 10 hours to complete and if you write a bad code by putting sleep() it takes 20 hours to complete. On 4/5/14, Sanem Arslan <sanem.ars...@boun.edu.tr> wrote: > Mahmood, > > I have comfirmed that sleep() function executes. Besides that, > simulation execution on host machine takes longer but execution time > value (sim_seconds) in stat file does not show a significant difference. > Alinti Mahmood Naderan <mahmood...@gmail.com> > >> Sanem, >> maybe you put sleep() somewhere in the code that never executes! Can >> you confirm that by breakpoints? >> >> On 4/4/14, Sanem Arslan <sanem.ars...@boun.edu.tr> wrote: >>> Hi all, >>> >>> I am using classic memory system and I have added several codes to >>> the "cache_impl.hh" and "blk.hh" files. However I cannot see the >>> performance overhead of these added codes on the gem5 execution time. >>> I have increased cache latency parameters from "CacheConfig.py" file >>> and I can see the values are updated through out the simulation by >>> looking trace file, but there is no significant impact on execution >>> time (sim_seconds). There is a post >>> (http://thread.gmane.org/gmane.comp.emulators.m5.users/15517/focus=15526) >>> that >>> claims there is no significant impact of increasing latency because of >>> optimizations implemented in the cache protocol in Classic Memory. >>> >>> Moreover I have changed "blk->whenReady" parameter aggresively and I >>> have put some sleep() functions somewhere in cache structures again, >>> but there is no effect on the execution time. >>> >>> How can I observe the performance overhead of my added codes? If you >>> have any suggestions, please let me know. >>> >>> By the way, I am using gem5.opt and X86 with full system mode. >>> >>> Thanks for you time and help. >>> >>> Sanem. >>> _______________________________________________ >>> gem5-users mailing list >>> gem5-users@gem5.org >>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>> >> >> >> -- >> Regards, >> Mahmood >> _______________________________________________ >> gem5-users mailing list >> gem5-users@gem5.org >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >> > > > -- Regards, Mahmood _______________________________________________ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
