Date: Sun, 21 Jan 2001 17:07:26 +0200 From: "Noor Dawod" <noor@comrax.com> To: <freebsd-questions@freebsd.org> Subject: Unexplained high-loads on FreeBSD Message-ID: <PHEBIOJOBJJLIIJCOINKIELODCAA.noor@comrax.com>
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This is a multi-part message in MIME format. ------=_NextPart_000_0053_01C083CC.A0EF2C90 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: 7bit Hello all, I've been trying to fix a problem I'm facing without luck for the last few weeks. I also searched mailing lists for a similar problem, both MySQL and FreeBSD, without luck. The situation is as follows... A brank new server was deployed last month for our company. It's a 933Mhz Xeon-based server, with 1GB of memory, a RAID-5 system utilizing 4 IBM SCSI 10K RPM LVD disks. As you can see, a very high-performance server for our company's Web needs. I installed FreeBSD 4.1.1 on it, then upgraded to 4.2-STABLE up to last week's snapshot. Currently, it has Apache 1.3.14 + mod_ssl, MySQL 3.23.31 and PHP 4.0.4pl1 -- as you can imagine, most RECENT versions. The problem persists, though, and here it is: every once in a while, sometimes once a week, the mysqld process goes into OVERHEAT state with CPU usage getting as high as 97%, thus making it almost impossible for clients to connect to it. I checked mysqld's process usage once while this happened, and I found around 60 processes (connections). Not a big deal as I saw much more processes connect to the same daemon before, and still it continued to work. Anyways, this problem keeps bugging me all the time. I look at lists over and over and cannot understand why this is happening. I've even tried limiting Apache to a minimum of connections (sometimes as low as 300 maximum requests for the whole Apache daemons), but it didn't help -- eventualy, mysqld would go into this almost-dead state and no more Web pages would be served correctly. I'm attaching the my.cnf file for you to examine. Remember, this is the stock my.cnf file that came with MySQL for large Web sites (those having more than 512MB of memory), with a little modification. By the way, someone on the MySQL mailing list suggested that BSD's threading support "sucks", and only after he moved to Debian that these simptoms disappeared. I'd appreciate any hint or fix that you might have, and I would even let serious bug-hunters/mysql gurus get a shell on our server to try to check and fix this problem. Thanks in advance. Noor ------=_NextPart_000_0053_01C083CC.A0EF2C90 Content-Type: text/plain; name="my.cnf.txt" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="my.cnf.txt" # This is for large system with memory =3D 512M where the system runs = mainly=0A= # MySQL.=0A= =0A= [client]=0A= #password =3D your_password=0A= port =3D 3306=0A= socket =3D /mysql/mysql.socket=0A= =0A= [mysqld]=0A= port =3D 3306=0A= socket =3D /mysql/mysql.socket=0A= pid-file =3D /mysql/mysql.pid=0A= tmpdir =3D /mysql/tmp/=0A= skip-locking=0A= skip-name-resolve=0A= log=0A= set-variable =3D key_buffer=3D256M=0A= set-variable =3D max_allowed_packet=3D1M=0A= set-variable =3D table_cache=3D256=0A= set-variable =3D sort_buffer=3D1M=0A= set-variable =3D record_buffer=3D1M=0A= set-variable =3D myisam_sort_buffer_size=3D64M=0A= set-variable =3D thread_cache=3D8=0A= set-variable =3D thread_concurrency=3D2 # Try number of CPU's*2=0A= set-variable =3D max_connections=3D200=0A= #log-bin=0A= #server-id =3D 1=0A= =0A= # Uncomment the following if you are using BDB tables=0A= #set-variable =3D bdb_cache_size=3D64M=0A= #set-variable =3D bdb_max_lock=3D100000=0A= =0A= # Point the following paths to different dedicated disks=0A= #tmpdir =3D /tmp/ =0A= #log-update =3D /path-to-dedicated-directory/hostname=0A= =0A= [mysqldump]=0A= quick=0A= set-variable =3D max_allowed_packet=3D16M=0A= =0A= [mysql]=0A= no-auto-rehash=0A= #safe-updates # Remove the comment character if you are not familiar = with SQL=0A= =0A= [isamchk]=0A= set-variable =3D key_buffer=3D128M=0A= set-variable =3D sort_buffer=3D128M=0A= set-variable =3D read_buffer=3D2M=0A= set-variable =3D write_buffer=3D2M=0A= =0A= [myisamchk]=0A= set-variable =3D key_buffer=3D128M=0A= set-variable =3D sort_buffer=3D128M=0A= set-variable =3D read_buffer=3D2M=0A= set-variable =3D write_buffer=3D2M=0A= =0A= [mysqlhotcopy]=0A= interactive-timeout=0A= ------=_NextPart_000_0053_01C083CC.A0EF2C90-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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