server load?
Hi, I noticed that the load on my qmail server was running higher than I expected to, although I don't know should be normal for a qmail mail server. Perhaps someone here can tell me if this is normal, or if I should look at fixing something? I haven't yet applied the Russ Nelson's big-todo patch, would it clean up some of this stuff? I've got qmail 1.03, vpopmail 4.8.2 (yup, I should upgrade) and qmailadmin 0.34 running on a RedHat 6.2 system using tcpserver (not inetd). There are only around 30 virtual domains on this server, and it only allows relaying for our office mail, our virtual domains are not sending through this server at all. I have read the Life with qmail document, although it's entirely possible I missed the page that tells me the answer. ===TOP OUTPUT=== 45 processes: 42 sleeping, 3 running, 0 zombie, 0 stopped CPU states: 55.9% user, 16.7% system, 0.0% nice, 27.2% idle Mem: 127952K av, 124660K used, 3292K free, 4016K shrd, 55848K buff Swap: 265032K av, 4732K used, 260300K free 32496K cached PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND 16756 vpopmail 12 0 22436 21M 280 S 0 59.9 17.5 0:03 qmail-inject 16757 qmailq 9 0 328 328 260 R 0 5.7 0.2 0:00 qmail-queue 16753 vpopmail 0 0 500 500 376 S 0 0.5 0.3 0:00 vdelivermail 16677 root 1 0 1024 1024 824 R 0 0.3 0.8 0:00 top 14791 root 0 0 576 176 112 R 0 0.1 0.1 0:00 sshd 16754 vpopmail 0 0 756 756 628 S 0 0.1 0.5 0:00 sh 1 root 0 0 108 5244 S 0 0.0 0.0 0:04 init ===SNIP=== Thanks for any help. Ross Lawrie
server load problem
Hi, I am running redhat linux6.1, qmail. My server conf are as follows: Intel PIII 550 MHz, 1 GB RAM, 48GB SCSI HDD We are using a web based software developed by our company for proving web based email service. Now there are about 24000 users on our server. It is giving problems: 1: server gets hanged up. 2: CPU utilization id very high 3: RAM is being used too much. I need a help to do memory management as well as to configure qmail for very heavy loads. Thank you kapil -- Kapil Sharma DSF Internet Services Pvt. Ltd. [EMAIL PROTECTED] http://www.dsfinternet.com
Re: server load problem
I found out from top that mysqld is taking most of the cpu utilization. Now how to customize it? Server is hanging up and it won't respond to ctrl-alt-del kapil Greg Owen wrote: > We are using a web based software developed by our > company for proving web based email service. Now > there are about 24000 users on our server. It is > giving problems: > 1: server gets hanged up. Define "hanged up." You get a kernel oops? System doesn't oops but stops responding to network and keyboard input? System won't respond to control-alt-delete? > 2: CPU utilization id very high Great. Who's using it? Use 'top', 'ps', or whatever your favorite tool is to track heavy processor users. > 3: RAM is being used too much. Great. Who's using it? Use 'top', 'ps', or whatever your favorite tool is to track memory hogs. I think you will find that, unless it is misconfigured (e.g. the startup script is starting qmail over and over again) that qmail isn't responsible for high CPU or high RAM. > I need a help to do memory management as well as to > configure qmail for very heavy loads. You need to find out who is using all that memory and CPU, and either fix it or decide you need to add processor and memory. Once you've got spare capacity on the machine, you should modify your concurrencyremote setting and your allowed concurrent incoming connections (tcpserver -cN where N is the max incoming concurrent connections) so that they can use the capacity. But I recommend fixing your CPU/RAM problems first. -- gowen -- Greg Owen -- [EMAIL PROTECTED] -- Kapil Sharma DSF Internet Services Pvt. Ltd. [EMAIL PROTECTED] http://www.dsfinternet.com
RE: server load problem
I found out from top that mysqld is taking most of the cpu utilization. Now how to customize it? That's a better question for a MySQL list. The problem can fall into one of three categories: 1) MySQL itself has a bug which is being exercised and which needs fixing 2) Your company's code is inefficiently using MySQL and should be optimized 3) MySQL is fine, your code is fine, you just need more server for 24000 users You'll need to find a MySQL resource that can help you with those questions. This list isn't it. Server is hanging up and it won't respond to ctrl-alt-del I would definitely raise that on a MySQL list. I have never seen a server with MySQL hit that failure mode, but my MySQL server experience was with much smaller installations. There are probably MySQL diagnostics and logs which can help you figure out why things are getting that bad. -- gowen -- Greg Owen -- [EMAIL PROTECTED]
Re: Mail server load testing
On Thu, 1 Apr 1999 01:26:19 -0500, Dave Teske wrote: Does anyone know of any apps that can do load testing on mail servers. I've seen a bunch that do web server load testing but none for mail servers. I've got our server on a tiny (486 w/P90 upgrade chip 24mb ram)box and I'd like to see how much load it'll handle before I go scrounging for a replacement. qmail is an excellent tool for this. Just set up another computer with qmail and a concurrencyremote as high or higher than the max number of connections you can accept on the test machine. Set up an ezmlm list on the test machine. Subscribe a lot of users test-123@testhost, over a range of "123". Set up a user "test" on testhost. Create ~test/.qmail-default with a single "#" in it. Send a message to the list on the other computer. It will send as many messages as there are subscribers to the test machine. It does less disk work that the test machine since it sends the same message to all subscribers. The test machine receives the messages, queues them, then delivers them discovering that the "#" which means that the delivery succeeds without writing anywhere. Thus, you test the [local] network, qmail-smtpd, queue and queuing, that you have memory for the set number of incoming connections, etc. For outbound mail, you can reverse the function of the two boxes. Do yourself a favor and set it up with tcpserver and daemontools (cyclog) directly. Otherwise, syslog may become limiting and you are slow on incoming connections and have less control over the number. Also, carefully read tcpserver docs on -H -l, etc. What isn't tested: outside net, named (run a caching one locally). Still, it tells you a lot, especially to what to limit the nuber of incoming connections (tcpserver -c) and outgoing (concurrencyremote/local) so that you don't run out of memory at maximum load. -Sincerely, Fred (Frederik Lindberg, Infectious Diseases, WashU, St. Louis, MO, USA)
Mail server load testing
Does anyone know of any apps that can do load testing on mail servers. I've seen a bunch that do web server load testing but none for mail servers. I've got our server on a tiny (486 w/P90 upgrade chip 24mb ram)box and I'd like to see how much load it'll handle before I go scrounging for a replacement. Thanks --Dave
Re: Mail server load testing
On Thu, Apr 01, 1999 at 01:26:19AM -0500, Dave Teske wrote: The Postfix distribution includes such tools. Go to: http://www.postfix.org Does anyone know of any apps that can do load testing on mail servers. I've seen a bunch that do web server load testing but none for mail servers. I've got our server on a tiny (486 w/P90 upgrade chip 24mb ram)box and I'd like to see how much load it'll handle before I go scrounging for a replacement. -- System Administrator See complete headers for address, homepage and phone numbers
Re: Mail server load testing
Thanks thats exactly what I wanted. I got the smtp sending tester working (of course I didn't like the results...) Would you happen to know of any docs for the 2 apps. I gathered what I needed for the cmdline help but addtl info would be great. Thanks again --Dave The Postfix distribution includes such tools. Go to: http://www.postfix.org Does anyone know of any apps that can do load testing on mail servers. I've seen a bunch that do web server load testing but none for mail servers. I've got our server on a tiny (486 w/P90 upgrade chip 24mb ram)box and I'd like to see how much load it'll handle before I go scrounging for a replacement. -- System Administrator See complete headers for address, homepage and phone numbers
