Date: Thu, 7 Mar 2002 09:53:40 +0100 (CET) From: Konrad Heuer <kheuer@gwdg.de> To: Dimitar Peikov <mitko@rila.bg> Cc: freebsd-hackers@freebsd.org Subject: Re: Swapping performance Message-ID: <20020307094856.K17236-100000@gwdu60.gwdg.de> In-Reply-To: <20020307104518.0f73740b.mitko@rila.bg>
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On Thu, 7 Mar 2002, Dimitar Peikov wrote: > I start some performance tests on -stable and on SuSE 7.1 / 2.4.17. I > don't comment about 'bzero' performance, but when RAM is over, Linux > is much faster. I have no idea what is the algorithm of swapping but it s= eems that the granularity of swapping pieces is the key or the importance o= f swapping memory blocks of certain task. Ooo I forgot to say that the both= machines have the same hardware, IBM 300PL, 256 RAM and no other tasks run= ning. I had to run these tests to choose the fastest platform for building = our software indexes, which requires a lot of math and memory operations. > > --- with bzero --- > Linux$ time ./malloc_test > *# > real 0m37.640s > user 0m1.370s > sys 0m2.950s > Linux$ > > FreeBSD$ time ./malloc_test > *# > real 0m46.640s > user 0m2.280s > sys 0m2.550s > FreeBSD$ > > --- without bzero --- > Linux$ time ./malloc_test > *# > real 0m6.371s > user 0m0.450s > sys 0m1.510s > Linux$ > > FreeBSD$ time ./malloc_test > *# > real 0m11.571s > user 0m1.150s > sys 0m1.830s > FreeBSD$ Just to make sure: What about disk layout and paging space location? Both systems will behave best when paging space location is near to the "beginning" of the disks. My measurements in this area are some years old; at that time FreeBSD did a much better job when klow on free memory. Best regards Konrad Konrad Heuer Personal Bookmarks: Gesellschaft f=FCr wissenschaftliche Datenverarbeitung mbH G=D6ttingen http://www.freebsd.org Am Fa=DFberg, D-37077 G=D6ttingen http://www.daemonnews.o= rg Deutschland (Germany) kheuer@gwdg.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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