In learning that some hosts seem to be tightening shared hosting specs, I'm wondering what a 'simultaneous process' is... as from this clip: 'number of simultaneous processes should not exceed 5'.
Is each part - for example, graphics and includes - of an individual webpage a 'process'?
I have a server that has server load showing at 25-40 (once it was even 53!), running like that for hours. The server has 4 cpus - and yet the sites on the server seem to run fine when I check them. What I'm wondering is, what exactly is load in this context; and how can load run so high like that without the server crashing?
According to top, the load is caused by httpd processes running under user 'nobody', that often take up double digit CPU percentage.
Does Apache always run under 'nobody'?
Is there any way to trace an httpd processes - which account it's for, or which physical script or URL is calling it?
And for top itself, the TIME field on one server of mine is in the format xx:xx (e.g. 3:25), on another it's TIME+ and in the format xx:xx.xx (e.g. 30:02.77). What exactly does this mean? I would asume it's minutes:seconds and minutes:seconds:hundredths, but while watching top it doesn't seem to correlate with that.
I have 2 almost similar webservers:
debian 3.2, P4 3GHZ, 1 Gb ram, kernel 2.6, apache2, php4
Initial apache2.conf:
Code:
Timeout 4
KeepAlive Off
KeepAliveTimeout 2
ServerLimit 1500
<IfModule prefork.c>
StartServers 10
MinSpareServers 10
MaxSpareServers 15
MaxClients 1500
MaxRequestsPerChild 3000
</IfModule>
I update the sources.list on server 1 to mirrors of the new debian 4 etc . I run apt-get update and apt-get dist-upgrade . A whole bunch of things get updated (it was long time ago that I did this anyway). After some troubles with /boot/grub/menu.lst the server boots ok, and everything is well. This server used to have loads of 15-25 at peak times, but after the update its running very smooth with loads of 2-3 at the same peak times. I dont know why exactly, as I noticed updates in OS , kernel version (from 2.6.8x to 2.6.18) , apache2 , php (4.4.4-8+etch1) , and I also needed to update eaccelerator from 0.94 to 0.95 .
A few days later I update server 2. Everything seems to go the same, although the kernel version stays at 2.6.8-3-686. I dont think kernel version at start was exactly same at server 1. But the new php version is the same as server 1, and everything else looks the same too.
But when peak times are coming up, this server starts to have troubles. It is quickly rising to total of 200-300 processes , while server 1 always stays stable at 60-70.
Server 2 also reacts slow if I click somewhere on the site. It takes 5-10 seconds to show a new page. However the load stays pretty low at 1-2 . I see no big cpu usage and also no big memory usage. I have the impression that this server 2 is somehow wasting a lot of apache processes and is making things hard for itself without a real reason.
When I check the seperate mysql database server, I also notice a lot of processes.
Around 200-250 whereas it used to be 40-60. Sometimes this adds up so hard, that all webservers are blocked because mysql has too much processes. When I check the mysql connections, I see a few dozen things like 'unauthen ip:port Connect login' just hanging. All of them have the ip of webserver 2. Those extra apache processes are somehow hanging on to the mysql server without really doing something.
I dont know what is happening, but this server is underperforming very badly now. I managed to limit the problem by drastically lowering ServerLimit and MaxClients on webserver 2 , but this is no real solution. The server is still slow, at least now its not bringing down the others.
My question : what should I check for now ? I noticed a different structure in the conf files in debian etch, maybe something new has a bad influence on my old conf files? Is there something wrong with the combination of kernel+php version? I have no idea, please point me in the right direction so I can learn from this.
a topic long time ago that my server load is frequently high.
I'm talking about something like this
Server Load 158.86
Memory Used 28.2 %
Swap Used 99.57 %
[url]
The only way to solve this problem is to identify the load earlier and kill all httpd process. What I did was
#killall -9 httpd
#killall -9 httpd
#killall -9 httpd
x 30~40 times until no pid process found & the server load is back to normal.
On previous thread, I tried to update mysql & php and it works,
Right now again I am experiencing high server load again...
I'm very sure it's caused by httpd but I am still unable to find out the real cause of the problem and which account user is the culprit for causing this high load.
Can someone assist me by telling me where/how to begin with?
Is there a way to prevent a certain service from taking up a certain amount of load on the server?
Like, shouldn't there be a way I can tell gzip or exim how much server load they are allowed to take up on my server?
I know it may run them slower, but it will be for the better if I could set each one to only be able to have a max load peak or something.
I have a centos 4.4 server, I noticed the load is high and when I checked the top command I found the following:
Code:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
17212 root 25 0 11504 6236 908 R 57 0.3 195:58.73 http
27994 ftp 18 0 7624 2232 336 R 48 0.1 0:02.39 proftpd
7056 nobody 15 0 27764 10m 1884 S 8 0.5 0:00.62 httpd
4738 nobody 15 0 25788 8952 1976 S 7 0.4 0:08.01 httpd
7199 root 18 0 6376 3704 760 R 6 0.2 0:02.41 top
7021 nobody 16 0 27240 10m 1964 S 5 0.5 0:01.73 httpd
3999 nobody 16 0 26888 9.9m 2008 S 5 0.5 0:09.39 httpd
7180 nobody 15 0 26524 9524 1700 S 5 0.5 0:00.16 httpd
6330 nobody 15 0 26856 9.8m 1992 S 4 0.5 0:04.34 httpd
6272 nobody 15 0 26764 9912 1968 S 2 0.5 0:05.36 httpd
6239 nobody 15 0 25428 8476 1888 S 1 0.4 0:02.95 httpd
1 root 16 0 2300 96 68 S 0 0.0 4:46.28 init
20323 ftp 16 0 5116 428 312 S 0 0.0 0:00.92 proftpd
22126 ftp 16 0 5512 428 312 S 0 0.0 0:01.03 proftpd
22313 ftp 16 0 5644 424 312 S 0 0.0 0:01.00 proftpd
22781 ftp 16 0 5644 460 304 S 0 0.0 0:01.04 proftpd
22837 ftp 16 0 5644 424 312 S 0 0.0 0:01.02 proftpd
24157 ftp 16 0 5776 432 308 S 0 0.0 0:01.09 proftpd
24176 ftp 16 0 5776 432 308 S 0 0.0 0:01.09 proftpd
24989 ftp 16 0 6040 476 316 S 0 0.0 0:00.91 proftpd
25327 ftp 16 0 6172 548 308 R 0 0.0 0:01.02 proftpd
25526 ftp 16 0 6172 808 308 R 0 0.0 0:01.03 proftpd
26013 ftp 16 0 6172 1128 308 R 0 0.1 0:00.98 proftpd
26152 ftp 16 0 6172 1144 312 R 0 0.1 0:01.00 proftpd
26306 ftp 16 0 6172 1172 308 R 0 0.1 0:01.02 proftpd
26455 ftp 16 0 6172 1420 312 S 0 0.1 0:04.02 proftpd
26860 ftp 16 0 6172 928 308 S 0 0.0 0:01.04 proftpd
26936 ftp 16 0 6172 928 308 S 0 0.0 0:00.91 proftpd
27166 ftp 16 0 6172 800 308 S 0 0.0 0:00.96 proftpd
27329 ftp 16 0 6172 716 308 S 0 0.0 0:01.01 proftpd
15659 ftp 16 0 6172 592 308 S 0 0.0 0:00.99 proftpd
4944 ftp 16 0 6172 544 336 S 0 0.0 0:00.98 proftpd
5163 ftp 16 0 6304 544 336 S 0 0.0 0:00.99 proftpd
18964 ftp 16 0 6304 608 308 S 0 0.0 0:00.96 proftpd
19151 ftp 16 0 6304 620 328 S 0 0.0 0:00.99 proftpd
4986 ftp 16 0 6304 596 308 S 0 0.0 0:00.87 proftpd
30721 ftp 16 0 6436 612 312 S 0 0.0 0:00.94 proftpd
13808 ftp 16 0 6436 644 316 S 0 0.0 0:01.01 proftpd
13905 ftp 16 0 6436 640 316 S 0 0.0 0:00.97 proftpd
also when I checked the `ps aux` command I found a lot in this form:
Code:
ftp 22006 0.0 0.0 5512 424 ? S 01:24 0:01 proftpd: (accepting connections)
I am thinking about making a little php file that will print a flash game with a link to my site below the actual game. Other webmasters can use this php file on their site to embed this game.
I'm on shared hosting with Bluehost at the moment. What will be the implications on bandwidth and CPU if these php files which serve the games become popular (get hit quite frequently per day/hour/second)?
I just got a VPSlink account about a month ago and for all testing purposes, it has been great so far [my first VPS]. But I haven't transferred my main site to it yet mainly due to one specific question about download speeds. Quickly, here's what I've found about their network...
VPSLink is owned by Spry, so from all I can tell, they're using the same network speeds. Which are:
Unmetered: 1.5 megabits per sec in total traffic.
Metered: Spry's site says "throughput of up to 8Mbps"
Ok, so here's what I'm trying to find out:
I'm running a small software business with some downloads (all legal of course - they're mine ) and would like to know what the real-world download speeds that users would normally see when downloading my files. Here are the knowns:
a) Let's assume for this question that all of the user computer's are on very quick connections, so their speed wouldn't be an issue.
b) An example file would be say, 20 MB.
I'm most looking to see how speeds would be (in Kbps) if say, 20 people are downloading a 20 MB file at the same time (again, with their connections being extremely fast; fast enough for the sake of this example to not be a factor - so the max speed would only depend on my VPSlink server's connection).
I don't know of a good way to really test this since I only have access to 1 physical connection. I did try a test with a friend. Here's what happened:
I normally get about 500-600kbps sustained on my cable modem, as does my friend. When downloading a test file on my server I was able to get about that when downloading all alone. But, when my friend and I downloaded it at the same time, both of us got around 350kbps -- so the total speed about dropped in half. Again since my site is for software downloads, and when releasing an update to one of our products, sometimes I'm guessing 20+ users download simultaneously for a couple days.
This currently seems to work ok on Dreamhost, but for many other reasons, we're needing a VPS. But would this vastly decrease our file transfer download speeds to users? If users got something horrible like 2kbps, that would most certainly loose a lot of business for us since they'd just get frustrated and cancel for the most part.
Does anyone know of a rough estimate on how to figure this out, or even better, are there any VPSLink customers out there that have experience with this?
So the rule of thumb is if you have a 30A circuit to not exceed 80% or 24A.
If I buy a 30A circuit, I am assuming it is protected by a circuit breaker that is 30A, correct?
In *theory* we could run 29-30A all day and be fine.
So, I understand, the rule of 80% to be to the effect that "during startup, equipment uses more power ... or during runtime if it heats up, the fans go faster using more power" so it is safe to be at 24A in case you get spikes to 27-29A.
Is my reasoning correct?
Further, if you run primary/redundant circuits, is there really harm in running 13A on one circuit and 14A on the other.. and in the unlikely event of a failure, you are running 27A on one circuit (at 90% instead of 80%).
Any thoughts on this? Getting an extra 3A out of a 208V circuits is like putting in 3-4 more servers. If someone is doing this please let me know. I think it would work fine but i would like to know from the experts that do the colo stuff for a living what problems i could encounter, if any.
My server has been crashing quite alot lately, it does have some high traffic sites on there but it has never really been this bad before. Today i noticed these in cpanel, what are they and is there anyway I can control them?
View 13 Replies View Relatedi am facing slight problem with one of my VPSes. It had happened earlier also but had got resolved automatically.
Please see this screenshot: [url]
i know that the server load is not that great to cause this much SWAP usage. i think this is because of the processes not getting killed.
UPDATE: here is the screenshot of my other server with the same provider. which is not really overloaded but i think is facing the same problem of processes not getting killed [url]
Code:
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39(pdflush)/
41(aio/0)/
21(khubd)/
40(kswapd0)/
187(kseriod)/
301(kjournald)/
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1704(kauditd)/
1745(kmirrord)/
1975(kjournald)/
1976(kjournald)/
1977(kjournald)/
1978(kjournald)/
1979(kjournald)/
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2737(authdaemond)/usr/libexec/courier-authlib/authdaemond//usr/libexec/courier-authlib/authdaemond�
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4534(chkservd)/usr/bin/perl/chkservd
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4566(couriertcpd)/usr/lib/courier-imap/libexec/couriertcpd//usr/lib/courier-imap/libexec/couriertcpd�-address=0�-maxprocs=40�-maxperip=30�-nodnslookup�-noidentlookup�995�/usr/lib/courier-imap/bin/couriertls�-server�-tcpd�/usr/lib/courier-imap/sbin/pop3login�/usr/lib/courier-imap/bin/pop3d�Maildir�
4644(clamd)/usr/sbin/clamd//usr/sbin/clamd�
4648(exim)/usr/sbin/exim/var/spool/exim/usr/sbin/exim�-bd�-oX�26�
4654(exim)/usr/sbin/exim/var/spool/exim/usr/sbin/exim�-bd�-q60m�
4658(exim)/usr/sbin/exim/var/spool/exim/usr/sbin/exim�-tls-on-connect�-bd�-oX�465�
4666(antirelayd)/usr/bin/perl/antirelayd
4752(spamd)/usr/bin/perl//usr/bin/spamd -d --allowed-ips=127.0.0.1 --pidfile=/var/run/spamd.pid --max-children=5
4762(spamd)/usr/bin/perl/spamd child
4763(spamd)/usr/bin/perl/spamd child
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4877(xfs)/usr/X11R6/bin/xfs/xfs�-droppriv�-daemon�
4886(anacron)/usr/sbin/anacron/var/spool/anacronanacron�-s�
4969(httpd)/usr/local/apache/bin/httpd//usr/local/apache/bin/httpd�-k�start�-DSSL�
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5083(cphulkd.pl)/usr/bin/perl/cPhulkd - processor
5105(cpdavd)/usr/bin/perl/cpdavd - accepting connections on 2077 and 2078
5116(cpbandwd)/usr/bin/perl/cpbandwd
5117(cpanellogd)/usr/bin/perl/cpanellogd - sleeping for logs
5154(mailmanctl)/usr/local/bin/python2.4/usr/local/cpanel/3rdparty/mailman/usr/local/bin/python2.4�/usr/local/cpanel/3rdparty/mailman/bin/mailmanctl�-s�start�
5155(python2.4)/usr/local/bin/python2.4/usr/local/cpanel/3rdparty/mailman/usr/local/bin/python2.4�/usr/local/cpanel/3rdparty/mailman/bin/qrunner�--runner=ArchRunner:0:1�-s�
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5195(mingetty)/sbin/mingetty//sbin/mingetty�tty2�
5196(mingetty)/sbin/mingetty//sbin/mingetty�tty3�
5197(mingetty)/sbin/mingetty//sbin/mingetty�tty4�
5198(mingetty)/sbin/mingetty//sbin/mingetty�tty5�
5199(mingetty)/sbin/mingetty//sbin/mingetty�tty6�
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Recently server been a lil unstable... unsure why.. only recent thing i've installed is eaccelerator thingy.
and It was a lil unstable before that..
I have Apache2 installed on my dedicated server. I would like to install a mod / configure my Apache Server in order to limit simultaneous connections / IP.
The thing that I want is that for example if I want a maximum of 2 simultaneous connections / IP, when that IP reaches the LIMIT, I would like to delay its next request, and NOT display him a 503 error like most mods DO.
how many simultaneous users on the 2 hostservers below can .
Here are some spec from 2 hostservers.
Processor Pentium 4 2.4Ghz
DDR Memory 1024mb
Hard Drive 80gb SATA
and here is the second one .
Intel Xeon 3040 Dual Core 1.86GHz Processor
2 GB 667MHz ECC RAM
Dual Gigabit Ethernet NIC
2 x 160GB SATA2 Western Digital disks
if you now a better one please tell and give the spec from the server and the number of simultaneous users it can handle.
And lets say fore the simultaneous users that they are on a forum.
I do a ps aux, and get a bunch of:
/usr/sbin/httpd
Each one takes up like 4% of the available ram - and when the ram is gone, the server dies (it doesn't have a swap file - half the time you can't even log in to it), and you have to reboot Apache.
I thought of limiting maxchilds, but would that break something else?
Should I just make a swap file? Will that defeat the point of creating child processes?
I would like to know if it is possibl to limit SSH logins for any user to 2. The OS is CentOS.
View 3 Replies View RelatedIs there anyway to test how many simultaneous connections my host is allowing me to have? I seem to be getting alot of people telling me my site is unavailable and so on when I'm not having an issue. My site joomlaplazza.com and host by VT6 extreme account.
Cpanel.
I'm not sure I understand the server-status page enough to know if this is a problem or not, but I have several processes that seem to run forever, or until I restart Apache. e.g.
Code:
13-1 21045 0/697/4264 W 59.45 19641 0 0.0 43.28 274.97 66.249.66.133 www.example.com GET /wp/2005/01/ HTTP/1.1
19-1 408 1/834/1831 C 83.52 32463 0 14.8 149.66 263.48 66.249.66.133 www.example.com GET /wp/ HTTP/1.1
30-1 14416 0/430/431 W 35.19 13347 0 0.0 37.42 37.44 66.249.66.133 www.example.com GET /wp/category/issues/ HTTP/1.1
They are almost always on a single domain (there's about 100 on the server) that's a Wordpress site. These processes are also almost always a search engine.
On the rare case I see them running on other domains on the same server they're always on Wordpress sites.
The longer the processes run, the more processor/memory they use, the more they slow the server down.
It seems to have just started in the past few weeks, I've had the site there for a couple years.
I'm new to fcgid on Windows. my current set up is as follows;
Windows Server 2008
Apache 2.4.4
PHP 5.3.27 (fcgid)
MySQL 5.6.14
1. Looking at windows task manager, each of my processes have 4 threads each. What does this mean?
2. Does the number of FcgidMaxProcesses x memory_limit = Total amount of memory required?
3. Number of Threadsperchild = number of FcgidMaxProcesses ?
I just want to know how these two work together.
I have done some searching here but wasn't able to find what I was looking for, so am making a new post.
I have a client who needs an online training web application. I have done plenty of sites in the past, but none with streaming video so am really unsure what type of hardware this requires. At peak the client expects 50 users watching streaming video at the same time (so lets double it to 100 to be sure). What type of server hardware requirements am I looking at to deliver that content at a good speed with little to no hick ups? Also, is a 100Mbps link good enough?
Can I check what is the maximum number of connections for Remote Desktop Protocol in say W2k3? Also anyway to increase that? This question has been bugging me for a long time.
View 3 Replies View RelatedAnyone know of some good server load testers ( commercial )?
Im not looking for application based load testing, I need real web server load testing... need to see how much traffic this one site can take before it cries.
Our server is running; Plesk 11.0.9 and CentOS 5.7 it has a Q8200 CPU @ 2.33GHz and 2GB of RAM. Now there are just two websites on the server plus a couple of redirects/forwarding domains, although lots of domains are still on the server but turned off in Plesk. Both websites are OSCommerce sites and I just need to keep these sites going until the end of the year when we will switch to our new Joomla based website.
We have seen an increasing number of server crashes and after various checks of the logs, fitting a new BIOS battery, check of the hardware by EasySpace who host the server, installation of ClamAV, LMD and RKHunter (which did find some Trojans and Suspect software), I have traced it down to some external Http activity that is taking all of my CPU time and RAM. Here is a screen capture of the Htop listing and when I killed these processes the CPU and RAM went back to normal. The problem is that I usually have to restart the HTTPD service and sometimes things get so bad that the server crashes and I have to request a power cycle.
Simultaneous FTP User Question - Cpanel/WHM/Pure-FTP, Dual Xeon 2.4, 1gRAM, Dedicated
Does the following dedicated server spec throw any flags for you when considering our intended future use?
DEDICATED SERVER SPEC
Dual Xeon 2.40 ghz.
1 gig RAM
INTENDED FUTURE USE
- We currently host 300 low volume websites on the server.
- We only use 40 gigs of data bandwidth per month. (1000 allotted)
- We developed a new software product that allows auto-updates 300kb of data each day.
- We expect up to 500 people to use this software and need to access our FTP daily, at different times of the day (random).
- We plan to embed the FTP information into the software.
The FTP access will be transparent to the user.
Does our dedicated server sound like it could handle this? My guess is yes.
I'm having the oddest issue. For some reason, some of the websites on my server load fine, and some take a really long time to load (2 minutes).
Now, the server load is fine, and the size of the sites aren't the issue either. I've restarted Apache and a couple more services, and still the same sites seem to load very slow.
What could be causing this since it's only effecting certain websites?
ps x
Quote:
7992 ? S 0:08 [cifsd]
26898 ? S 0:00 [cifsoplockd]
26899 ? S 0:00 [cifsdnotifyd]
What are those processes?
anybody here have a review or a way to trace proccess from scratch after top -c or ps -aux
how i got the exact file or user cause this process ....
I just recently switched to using fcgid with cPanel and was wondering how I can go about seeing what is actually running under each process. Before when I was running PHP as CGI I could do psauxwe|grep PID and see all the environmental variables along with the path. I'm not able to do that any longer with fcgid. Is there anyway to get this info now?
View 2 Replies View Related
rpc 1749 1 0 04:15 ? 00:00:00 rpcbind
dbus 1766 1 0 04:15 ? 00:00:00 dbus-daemon --system
root 1790 1 0 04:15 ? 00:00:00 /usr/sbin/acpid
68 1798 1 0 04:15 ? 00:00:00 hald
root 1801 1 0 04:15 ? 00:00:00 /usr/sbin/console-kit-daemon
root 1802 1798 0 04:15 ? 00:00:00 hald-runner
root 1898 1802 0 04:15 ? 00:00:00 hald-addon-input: Listening on /dev/input/event1 /dev/input/event0
68 1939 1802 0 04:15 ? 00:00:00 hald-addon-acpi: listening on acpid socket /var/run/acpid.socket
just wondering if i really need them...