Date: Mon, 24 Dec 2007 19:11:46 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Krassimir Slavchev <krassi@bulinfo.net> Cc: FreeBSD <freebsd-stable@freebsd.org> Subject: Re: Performance! Message-ID: <476FF662.6050604@FreeBSD.org> In-Reply-To: <476A5EE1.9000003@bulinfo.net> References: <476A5EE1.9000003@bulinfo.net>
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Krassimir Slavchev wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hello, > > I have read all related threads about performance problems with multi > core systems but still have no idea what to do to make thinks better. > Below are results of testing postgresql on HP DL380G5 using sysbench. > The results are comparable to: > http://blog.insidesystems.net/articles/2007/04/11/postgresql-scaling-on-6-2-and-7-0 > but the same tests running on the same hardware using Linux (kernel > 2.6.18-53.1.4.el5 SMP x86_64) are very different. > PostgreSQL is tuned equal. > > dmesg: > ... > CPU: Intel(R) Xeon(R) CPU X5450 @ 3.00GHz (3000.02-MHz > K8-class CPU) > Origin = "GenuineIntel" Id = 0x10676 Stepping = 6 > > Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> > > Features2=0xce3bd<SSE3,RSVD2,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,<b19>> > AMD Features=0x20000800<SYSCALL,LM> > AMD Features2=0x1<LAHF> > Cores per package: 4 > usable memory = 8575655936 (8178 MB) > avail memory = 8288337920 (7904 MB) > ACPI APIC Table: <HP ProLiant> > FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs > ... > > test: > sysbench --num-threads=${i} --test=oltp --pgsql-user=bench > - --pgsql-db=bench --db-driver=pgsql --max-time=60 --max-requests=0 > - --oltp-read-only=on run > > tuning: > kern.ipc.shmmax=2147483647 > kern.ipc.shmall=524288 > kern.ipc.semmsl=512 > kern.ipc.semmap=256 > kern.ipc.somaxconn=2048 > kern.maxfiles=65536 > vfs.read_max=32 > > kern.ipc.semmni=256 > kern.ipc.semmns=2048 > > results: > FreeBSD 7.0-BETA4 amd64 (cvsup on 20.12) GENERIC with SCHED_ULE > #threads #transactions/sec user/system > 1 500 7.4%,5.3% > 5 1990 30.9%,23.4% > 10 2510 39.9%,35.0% > 20 2549 44.5%,43.5% > 40 1921 29.8%,59.4% > 60 1580 22.7%,70.6% > 80 1341 18.9%,75.9% > 100 1227 16.5%,79.3% > > Linux > #threads #transactions/sec > 1 693 > 5 3539 > 10 5789 > 20 5791 > 40 5661 > 60 5517 > 80 5401 > 100 5319 > > > What can be done to improve these results? > > Best Regards > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.7 (FreeBSD) > > iD8DBQFHal7hxJBWvpalMpkRAsaiAJ9G3ZoTv6cUbR4yix07TEMf7PKm7gCgoroM > +xvcXkcaFjSTxYfjk5rqMko= > =Tpsq > -----END PGP SIGNATURE----- > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > > . > postgresql has some poor default settings on FreeBSD. You need to add: stats_command_string = off update_process_title = off Kris
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