Date: Mon, 17 Jan 2000 13:33:19 -0500 (EST) From: spork <spork@super-g.com> To: Steve Hovey <shovey@buffnet.net> Cc: Gene Harris <zeus@tetronsoftware.com>, freebsd-isp@FreeBSD.ORG, noc@inch.com Subject: Re: high load, nothing happening? (LONG) Message-ID: <Pine.BSF.4.00.10001171317540.18018-100000@super-g.inch.com> In-Reply-To: <Pine.BSF.4.05.10001171306250.7739-100000@buffnet11.buffnet.ne t>
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On Mon, 17 Jan 2000, Steve Hovey wrote: > The answer here (which I think someone posted) was 449 process running I entertained that thought briefly as well, but I have many other machines (including a public-access shell machine) that run almost that many processes with a load around .30 on lesser hardware. In my previous mail I showed a comparision between the two machines, and it really looks like something is just "wrong" or I'm missing something WRT having so many interface aliases configured. > Its probably settings in the apache config - starting too many servers > even though they are not being used - throwing you into major swapping - > you should only have say 10 or 20, with 5 or 10 spare children, and max > throttle so that getting busy doesnt get you crashed. We actually aren't running one apache with multiple virtuals on this server. This is one config per-customer, each customer's web server running under their own UID. Just a different type of service for people that want such a thing. Each one starts up 2 children and 2 min-spare. Also this machine is currently completely idle... We also have these users currently spread over three very old Pentium 133 boxes and they don't slow at all and generally hover around .10... > I would have to see a ps -ax to confirm for sure Lots of these (130): root@supaweb[/usr/src/sys/compile/SUPAWEB]# ps -auxww | grep root | grep apac root 3338 0.0 0.1 1468 1092 ?? Ss 5Jan00 0:16.64 /usr/local/etc/apache/bin/httpd-apache_current -d /var/www/nadasurf (httpd-apache_1.3) root 3352 0.0 0.1 1468 1112 ?? Ss 5Jan00 0:16.82 /usr/local/etc/apache/bin/httpd-apache_current -d /var/www/acmew (httpd-apache_1.3) root 3357 0.0 0.1 1468 1112 ?? Ss 5Jan00 0:18.06 /usr/local/etc/apache/bin/httpd-apache_current -d /var/www/iaed (httpd-apache_1.3) root@supaweb[/usr/src/sys/compile/SUPAWEB]# ps -auxww | grep -v root | grep apac about 2x as many of these (265): nadasurf 31414 0.0 0.1 1468 1112 ?? I 12:03AM 0:00.00 /usr/local/etc/a pache/bin/httpd-apache_current -d /var/www/nadasurf (httpd-apache_1.3) nadasurf 31415 0.0 0.1 1468 1112 ?? I 12:03AM 0:00.00 /usr/local/etc/a pache/bin/httpd-apache_current -d /var/www/nadasurf (httpd-apache_1.3) china 31421 0.0 0.1 1468 1120 ?? I 12:03AM 0:00.00 /usr/local/etc/a pache/bin/httpd-apache_current -d /var/www/china (httpd-apache_1.3) china 31422 0.0 0.1 1468 1120 ?? I 12:03AM 0:00.00 /usr/local/etc/a pache/bin/httpd-apache_current -d /var/www/china (httpd-apache_1.3) Thanks, Charles > On Mon, 17 Jan 2000, Gene Harris wrote: > > > Ummm... > > > > In rc.conf, have you verified that lo0 is in the network > > interfaces list and not auto? Sorry if this sounds > > rinky-dink, but it can cause a machine to slow to a crawl. > > > > *==============================================* > > *Gene Harris http://www.tetronsoftware.com* > > *FreeBSD Novice * > > *All ORBS.org SMTP connections are denied! * > > *==============================================* > > > > On Mon, 17 Jan 2000, spork wrote: > > > > > Hi, > > > > > > I'm trying my luck over here, I already posted to -questions without any > > > resolution. I'm including my original post and below that a summary of > > > some responses and my answers... > > > > > > [begin orginal post] > > > We just built a large webserver machine (PII-450, 896MB RAM, 30-odd G of > > > Mylex RAID, 3.3-R) that constantly runs a load of from 1 to 3, even though > > > it's not doing anything (still sitting as a staging server). The initial > > > startup is also very slow; after about 40 of the servers start there's > > > about a 15 second pause, then another 40, pause, etc... > > > > > > This box is running about 170 virtual hosts (and a full class C > > > of addresses aliased to fxp0) under Apache 1.3.9, with each vhost running > > > as it's own user and starting 3 servers at startup, so there are a large > > > *number* of processes, but no swapping with about half a gig of RAM left > > > free. > > > > > > I have maxusers at 512, NMBCLUSTERS at 4096, and the following sysctl > > > adjustments: > > > > > > kern.maxproc: 8212 > > > kern.maxfiles: 100000 kern.maxfilesperproc: 16424 > > > kern.maxprocperuid: 8211 kern.ipc.somaxconn: 512 > > > > > > This is all gathered from various "tuning for a big webserver" posts from > > > the various FBSD lists. > > > > > > systat, vmstat, iostat all look normal, and I've not seen any curious > > > entries in the logs. > > > > > > So that's the info, my questions are "why the load", and "is that OK"? > > > Something seems wrong here, but I'm at a loss. > > > > > > Any ideas where to start looking? > > > > > > [followup #1] > > > > > > > What does top(1) report? > > > > > > last pid: 23684; load averages: 3.74, 1.96, 1.46 up 7+21:10:15 10:35:38 > > > 449 processes: 1 running, 448 sleeping > > > CPU states: 0.0% user, 0.0% nice, 2.7% system, 0.0% interrupt, 97.3% idle > > > Mem: 62M Active, 355M Inact, 45M Wired, 8350K Buf, 418M Free > > > Swap: 784M Total, 784M Free > > > > > > PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND > > > 23684 root 30 0 1976K 944K RUN 0:00 3.08% 0.29% top > > > 904 root 2 -12 1036K 720K select 0:31 0.00% 0.00% xntpd > > > 4163 root 2 0 1468K 1096K select 0:13 0.00% 0.00% > > > httpd-apache_1 > > > 3399 root 2 0 1468K 1096K select 0:13 0.00% 0.00% > > > httpd-apache_1 > > > > > > [followup #2] > > > > > > > that value for NMBCLUSTERS is going to be lower than what maxusers at > > > > 512sets it to, try 16384 or leave it up to maxusers. > > > > > > [followup #3] > > > > > > > Hum....that could certainly contribute to load. Have you checked vmstat > > > ^^^^ (he's referring to the number of processes) > > > > to see what the system calls are like (frequency that is). > > > > > > Nothing's blocked, and the other numbers look very similar to much smaller > > > boxes doing nothing: > > > > > > procs memory page disks faults cpu > > > r b w avm fre flt re pi po fr sr da0 fd0 pa0 in sy cs us sy id > > > 0 0 0 106760426976 2 0 0 0 2 0 0 0 0 230 474 155 0 0 99 > > > 0 0 0 106760426976 4 0 0 0 0 0 0 0 0 233 408 136 0 2 98 > > > 0 0 0 106760426976 3 0 0 0 0 0 0 0 0 235 408 136 0 2 98 > > > > > > [followup #4] > > > > > > > what ???? > > > > you are asking why high load ??? > > > > don;t you see you have 500 processes on your box ?? > > > > it's normal to have 3 of load average if you got 500 processes! > > > > > > Here's a snippet from a shell/web server that is doing actual work. It > > > has less memory, a slower processor and a number of interactive users. > > > The load however rarely climbs above 1.0 unless a process goes runaway: > > > > > > last pid: 25042; load averages: 0.38, 0.35, 0.63 13:26:43 > > > 301 processes: 1 running, 300 sleeping > > > CPU states: 0.4% user, 0.0% nice, 0.8% system, 0.8% interrupt, 98.1% idle > > > Mem: 119M Active, 44M Inact, 36M Wired, 34M Cache, 6027K Buf, 17M Free > > > Swap: 640M Total, 37M Used, 603M Free, 6% Inuse > > > > > > PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND > > > 25040 root 28 0 844K 1120K RUN 0:00 1.89% 0.34% top > > > 24823 freddy 2 0 4180K 2964K select 0:00 0.23% 0.23% pine4.21 > > > 24919 byman 3 0 796K 1040K ttyin 0:00 0.04% 0.04% tcsh > > > 24537 inch_hom 2 0 640K 872K sbwait 0:00 0.04% 0.04%httpd-1.3.3-us > > > > > > So I'd kind of assume I wouldn't see a radical difference between a > > > machine with 500 idle processes and one that's running 300 and is in > > > active use... > > > > > > So if anyone even has a similarly configured box, I'd love to hear from > > > you. I feel something is wrong here, but I can't find it... > > > > > > Thanks, > > > > > > Charles > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > with "unsubscribe freebsd-isp" in the body of the message > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-isp" in the body of the message > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-isp" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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