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  • Website has become slower on a VPS, was much fast on a shared host. What's wrong?

    - by Arpit Tambi
    My shared host suspended my website stating system overload, so I moved my website to a VPS which has 4GB RAM. But for some reason the website has become very slow. This is the vmstat output - procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 0 0 3050500 0 0 0 0 0 1 0 0 0 0 100 0 0 Here's the Apache Benchmark output for a STATIC html page I ran on the server itself - Benchmarking www.ask-oracle.com (be patient)...apr_poll: The timeout specified has expired (70007) Total of 20 requests completed Update: Server Config: List item Centos 5.6 4 cores cpu 4 GB RAM LAMP stack with APC Wordpress Only one website It takes almost double time to load now, same website was much fast on shared hosting. I know I need to tweak some settings but have no clue where to start from? I have already tried to optimize apache, mysql etc. Update 2: CPU usage is low, see uptime output: 11:09:02 up 7 days, 21:26, 1 user, load average: 0.09, 0.11, 0.09 Update 3: When I load any webpage, browser shows "Waiting" for a long time and then page loads quickly. So I suspect server can accept only limited connections and holds extra connections in a waiting state. How to check this? Update 4: Following is the output on executing netperf TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost.localdomain (127.0.0.1) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 9615.40 [root@ip-118-139-177-244 j3ngn5ri6r01t3]# Here are the Apache MPM settings from httpd.conf, do they look okay? <IfModule worker.c> StartServers 5 MaxClients 100 MinSpareThreads 50 MaxSpareThreads 250 ThreadsPerChild 125 MaxRequestsPerChild 10000 ServerLimit 100 </IfModule>

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  • Is the sysadmin/netadmin the defacto project planner at your organization?

    - by user31459
    At my company it has somehow over the past few years slowly become my job to come up with a project plan, milestones and time lines for deployment of developer applications. Typical scenario: My team receives a request for a new website/db combo and date for deployment. I send back a questionnaire for the developer to fill out on all the reqs for the site (ssl? db? growth projections etc.) After I get back all the information, the head of development wants a well developed document of what servers will it live on why those servers what is the time line for creating the resources step-by-step SOP for getting the application on the server and all related resources created (dns, firewall, load balancer etc.) I maybe just whining but it feels like this is something better suited to our Project Management staff (which we have) or to the developer. I understand that I need to give them a time-line on creating the resources, but still feel like this is overkill. We already produce documentation on where everything lives and track configuration changes to equipment. How do other sysadmin folks handle this?

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  • Unable to specify parameters to cvlc in a script

    - by VxJasonxV
    I'm creating a script that issues a few curl commands in order to access a time-protected mms stream link, then set up a relay using cvlc (vlc's command line interface) for my own use on an unencumbered player. The curl aspect of this is working, as I can run as a browser and curl side by side and get the same access url. (It's time locked meaning the stream will work forever, but you have to connect quickly or the URL will time out.) The very end of the script prints the command I will run, which is then followed up by "exec $CMD". When I echo $CMD I get: cvlc --sout '#standard{access=http,mux=asf,dst=0.0.0.0:58194}' mms://[...] Manually Copy/Pasting this command in, verbatim, works perfectly fine, but as part of a script, the cvlc execution output says: [0x9743d0] main interface error: no suitable interface module [0x962120] main libvlc error: interface "globalhotkeys,none" initialization failed [0x9743d0] dummy interface: using the dummy interface module... [0xb16e30] stream_out_standard stream out error: no mux specified or found by extension [0xb16ad0] main stream output error: stream chain failed for `standard{mux="",access="",dst="'#standard{access=http,mux=asf,dst=0.0.0.0:58194}'"}' [0xb11cd0] main input error: cannot start stream output instance, aborting [0xb11f70] signals interface error: Caught Interrupt signal, exiting... Why is --sout behaving one way in a script (non-interactive shell?) vs. another way in the foreground (interactive shell) ?

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  • Can any postfix guru assist me determine how emails are still being sent via my server from unauthorized sources?

    - by Dave
    Hi all, I'm getting a little concerned as I run a small server hosting a number of websites and manage the email for a few dozen people. Just recently though I've had a couple of notifications from spamcop alerting me that spam has been sent from my server, and when I have a look over the logs from time to time I can indeed see that there are many repeated attempts of mail being sent from my server. Most of the time it gets knocked back from the destination servers but sometimes its getting through. Unfortunately I'm not linux or postfix expert, I can get by but had though I had my machine locked down quite securely, I don't allow relaying, when I check the online DNS/MX tools they tend to report my server as being OK so I'm not sure where to take it now and hoping someone might be able to throw me a few pointers. I get lots of entries like this in my MAIL.INFO log Jan 2 08:39:34 Debian-50-lenny-64-LAMP postfix/qmgr[15993]: 66B88257C12F: from=<>, size=3116, nrcpt=1 (queue active) Jan 2 08:39:34 Debian-50-lenny-64-LAMP postfix/qmgr[15993]: 614C2257C1BC: from=<[email protected]>, size=2490, nrcpt=3 (queue active) and Jan 7 16:09:37 Debian-50-lenny-64-LAMP postfix/error[6471]: 0A316257C204: to=<[email protected]>, relay=none, delay=384387, delays=384384/3/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host mx.fakemx.net[46.4.35.23] refused to talk to me: 421 mx.fakemx.net Service Unavailable) Jan 7 16:09:37 Debian-50-lenny-64-LAMP postfix/error[6470]: 5848C257C20D: to=<[email protected]>, relay=none, delay=384373, delays=384370/3/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host mx.fakemx.net[46.4.35.23] refused to talk to me: 421 mx.fakemx.net Service Unavailable) then there tends to be connection timeouts, so from what I see even though I had relaying disabled.. something is getting by and trying to send.. So if you can help that will be greatly appreciated, and any further logging/config info I can supply. Thanks

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  • Can USB Hubs affect peripheral performance?

    - by Daniel Rasmussen
    Like many laptops, mine has 2 USB 2.0 ports. I'm looking to purchase a USB hub for my peripheral devices. I'm also planning on purchasing a laptop cooler with two USB powered fans, which connects to a USB port but can extend the plug, so it doesn't use one up. (Sorry for the poor description; see the link for a picture.) My questions are these: Can one plug 'too many' peripherals into a USB port? Can I plug my fans into a port, then the hub into the fans, then my keyboard and mouse, mic, and webcam into the extender..? Is it possible to draw too much power from a port? Secondly, will a USB hub affect the performance of any of my devices? I'm mostly worried about my mouse and keyboard. I like wired mice because I've noticed some lag in my Bluetooth mouse.

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  • Server nearly unusable when doing disk writes

    - by Wikser
    My question closely relates to my last question here on serverfault. I was copying about 5GB from a 10 year old desktop computer to the server. The copy was done in Windows Explorer. In this situation I would assume the server to be bored by the dataflow. But as usual with this server, it really slowed down. At least I could work with the remote session, even there was some serious latency. The copy took its time (20min?). In this time I went to a colleague and he tried to log in in the same server via remote desktop (for some other reason). It took about a minute to get to the login screen, a minute to open the control panel, a minute to open the performance monitor, ... Icons were loading maybe one per second. We saw the following (from memory): CPU: 2% Avg. Queue Length: 50 Pages/sec: 115 (?) There was no other considerable activity on the server. The server seldom serves some ASP.NET pages, which became also very slow in this time. The relevant configuration is as follows: Windows 2003 SEAGATE ST3500631NS (7200 rpm, 500 GB) LSI MegaRAID based RAID 5 4 disks, 1 hot spare Write Through No read-ahead Direct Cache Mode Harddisk-Cache-Mode: off Is this normal behaviour for such a configuration? What measurements could give further clues? Is it reasonable to reduce the priority of such copy I/O and favour other processes like the remote desktop? How would you do that? Many thanks!

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  • Check file stamp using FTP to see if it is today's file.

    - by needshelp
    Hi, I am using FTP (plain version) to download files from a server. The name of the file is always the same. All I can do to check to know if it is today's file is look at the timestamp manually. How can I write FTP script to check if the time stamp is having today's date? If you have come across this situation and have solved it, please let me know. Thank you in advance for your time.

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  • Quartz Cron Trigger with Spring - triggering new cron before last ended

    - by Trick
    Simple question, I think. I have org.springframework.scheduling.quartz.CronTriggerBean triggering one job once a day. Because this method can last a long time (over 24 hours), will the next day at the same time a new job be executed if the last one is not ended yet? If yes - is it possible to turn off executing new jobs until the last one is finished? My method is trans-coding videos and some days there a lot of videos and could last long.

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  • Keeping track of changes - Django

    - by RadiantHex
    Hi folks!! I have various models of which I would like to keep track and collect statistical data. The problem is how to store the changes throughout time. I thought of various alternative: Storing a log in a TextField, open it and update it every time the model is saved. Alternatively pickle a list and store it in a TextField. Save logs on hard drive. What are your suggestions?

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  • Call plugin class in Java

    - by Josh Meredith
    How can I call a class in Java, when the name of the class won't be known at compile time (such as if it were a plugin). For example, from a GUI, a user selects a plugin (a Java class), the application then creates a new instance of the class, and calls one of its methods (the method name would be known at compile time (e.g. "moduleMain")). Thanks for any input.

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  • Using NHibernate to insert/update using a SQL server-side DEFAULT value

    - by Joseph Daigle
    Several of our database tables contain LastModifiedDate columns. We would like these to stay synchronized based on a single time-source. Our best time-source, in this case, is the SQL Server itself since there is only one database server but multiple application servers which could potentially be off sync. I would like to be able to use NHibernate, but have it use either GETUTCDATE() or DEFAULT for the column value when updating or inserting rows on these tables. Thoughts?

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  • How do I test controllers and views?

    - by ryeguy
    I'm using rails for the first time, and I love how test-oriented it is and how it encourages you to write tests. I'm just having a hard time figuring out what I should be testing when I test controllers and views. I know that you should test redirects and authorization in the controller tests, but what else? And what should go in view tests? If I'm "following the rules" and only putting loops, conditionals, and echoes in my views, then what is there left to test?

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  • CentOS vps is randomly rebooting

    - by develroot
    I have a centos vps (Parallels Virtuozzo container) which has been running for months. However, a few days ago it started to randomly reboot itself, and i can't find out why. And the biggest problem that i don't understand is that it takes 40 minutes to reboot (as far as i can see in the logs) root ~ # cat /var/log/messages | grep shutdown Oct 11 13:52:11 vps27 shutdown[23968]: shutting down for system halt Oct 14 14:55:17 vps27 shutdown[30662]: shutting down for system halt Oct 15 06:21:23 vps27 shutdown[20157]: shutting down for system halt And notice the time difference between shutdown and xinetd's start: Oct 15 06:21:23 vps27 shutdown[20157]: shutting down for system halt Oct 15 06:21:24 vps27 init: Switching to runlevel: 0 Oct 15 06:21:27 vps27 saslauthd[30614]: server_exit : master exited: 30614 Oct 15 06:21:38 vps27 named[30661]: shutting down Oct 15 06:21:47 vps27 exiting on signal 15 Oct 15 07:04:34 vps27 syslogd 1.4.1: restart. Oct 15 07:05:06 vps27 xinetd[1471]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in. Oct 15 07:05:06 vps27 xinetd[1471]: Started working: 0 available services And here's what Parallels Power Panel says in terms of Status Changes: Time Old Status Status Obtained Oct 15, 2011 06:23:46 AM Mounted Down Oct 15, 2011 06:22:31 AM Running Mounted Oct 14, 2011 03:06:48 PM Starting Running Oct 14, 2011 03:06:23 PM Down Starting Oct 14, 2011 03:06:08 PM Mounted Down Oct 14, 2011 02:58:24 PM Running Mounted For some reason it's getting into Mounting mode and then restarts itself. The only problem that i can imagine is disk space utilization, which is now 84%. But can that be a reson for system halt? Time Category Details Type Parameter Oct 15, 2011 07:08:33 AM Resource Resource counter_disk_share_used yellow alert on environment vps27 current value: 82 soft limit: 85 hard limit: 95 Yellow zone counter_disk_share_used Oct 15, 2011 06:27:23 AM Resource Resource counter_disk_share_used yellow alert on environment vps27 current value: 82 soft limit: 85 hard limit: 95 Yellow zone counter_disk_share_used Oct 15, 2011 06:23:50 AM Resource Resource counter_disk_share_used green alert on environment vps27 current value: 0 soft limit: hard limit: 0 Green zone counter_disk_share_used Oct 14, 2011 03:06:24 PM Resource Resource counter_disk_share_used yellow alert on environment vps27 current value: 83 soft limit: 85 hard limit: 95 Yellow zone counter_disk_share_used Oct 14, 2011 03:05:50 PM Resource Resource counter_disk_share_used green alert on environment vps27 current value: 0 soft limit: hard limit: 0 Green zone counter_disk_share_used

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  • What does it mean when git says a file "needs update"?

    - by endtime
    I can't for the life of me find any decent explanation of the "[file]: needs update" message that git sometimes spits out from time to time. Even the official git FAQ has explaining this marked as a TODO. If someone could explain A) what it means; and B) how to fix it, I would be extremely grateful.

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  • Page cache - initiate the first page request in the server

    - by Tiago Teixeira
    Hi, I'm implementing Outputcache in my application and it works fine, but the first time always take a lot to load and the next following request will be faster... I would like to know if there is a way to initiate the page caching on the server side and serve the cached page upon the very first request, rather than have it triggered by the user one first time. Any ideas/suggestions will be very much welcome. Best regards, TT

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  • Plotting in Matlab

    - by papaduke
    How do you plot two figures at the same time in Matlab? Every time I use surf() it plots over the old one. Also, how do you save the images so you can export them to MS word or powerpoint or something?

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  • "This Friday" in bash script

    - by Ben
    Hi, Is there a way to calculate a time stamp for the next coming up of a week day? So for instance, with friday, i'd like to be able to run some code that calculates that from today Wednesday 19/05/10, the next friday will be 21/05/10 and get a time stamp from it. I know the date command can parse a given string date according to a format, but I can't figure out how to calculate "next friday from today" Any idea? Cheers Ben

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  • Testing for disk write

    - by Montecristo
    I'm writing an application for storing lots of images (size <5MB) on an ext3 filesystem, this is what I have for now. After some searching here on serverfault I have decided for a structure of directories like this: 000/000/000000001.jpg ... 236/519/236519107.jpg This structure will allow me to save up to 1'000'000'000 images as I'll store a max of 1'000 images in each leaf. I've created it, from a theoretical point of view seems ok to me (though I've no experience on this), but I want to find out what will happen when there will be directories full of files in there. A question about creating this structure: is it better to create it all in one go (takes approx 50 minutes on my pc) or should I create directories as they are needed? From a developer point of view I think the first option is better (no extra waiting time for the user), but from a sysadmin point of view, is this ok? I've thought I could do as if the filesystem is already under the running application, I'll make a script that will save images as fast as it can, monitoring things as follows: how much time does it take for an image to be saved when there is no or little space used? how does this change when the space starts to be used up? how much time does it take for an image to be read from a random leaf? Does this change a lot when there are lots of files? Does launching this command sync; echo 3 | sudo tee /proc/sys/vm/drop_caches has any sense at all? Is this the only thing I have to do to have a clean start if I want to start over again with my tests? Do you have any suggestions or corrections?

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  • Create Embedded Resources problem

    - by Night Walker
    I am trying to add an Embedded Resource I am doing it like it is written in following tutorial http://msdn.microsoft.com/en-us/library/e2c9s1d7%28VS.80%29.aspx But I cant the Persistence property from Linked at compile time To Embedded in .resx It always gray at Linked at compile time . Any idea why i have this problem ? Thanks .

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  • Debugging Windows PC freeze

    - by Violet Giraffe
    I have a problem with my computer, would appreciate any hints/ideas. It usually begins not immediately after booting Windows, but at some unpredictable point in time, which doesn't seem to correlate with any specific actions of mine. First sign of a problem is process System starting to consume 25% CPU time steadily. I have a quad-core CPU, so it might be one thread working non-stop. At this point micro-freezes start to occur - screen stops refreshing, but if I have, say, music player running - it continues playing. If I try to do something between the freezes, like open Start menu, it will freeze completely and forever. If I press reset button the PC will shut down and then start cold, as opposed to usual reset behavior (which doesn't include PC shutting down). I have noticed that full restart upon reset is usual for hardware problems, but I think this problem isn't related to at least motherboard-CPU-RAM-videoadapter. It certainly isn't caused by overheating. One very important not is that it seems to be related to Windows hosted WLAN network: I have USB Wi-Fi dongle and have configured a hosted network to share cable Internet connection with Wi-Fi devices. I am not 100% certain there's a strong connection, but in 9 or 10 cases when I enabled the network (by executing netsh wlan start hostednetwork), it did freeze eventually (sometimes within minutes of starting the network, sometimes within hours), and on at least 10 days when I didn't start the network it never froze, no matter how I used the computer). There are no critical/error entries in the events log that I can suspect as being related, only regular stuff like "driver not loaded". I have found no critical/error events that are being logged around the time of freeze occurring and are not logged during normal boot without starting the WLAN.

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  • Timestamp issue with localtime and mktime

    - by egiakoum1984
    Please see the code below: #include <iostream> #include <stdlib.h> #include <time.h> using namespace std; int main(void) { time_t current_time = 1270715952; cout << "Subscriber current timestamp:" << current_time << endl; tm* currentTm = localtime(&current_time); char tmp_str[256]; //2010-04-08T11:39:12 snprintf(tmp_str, sizeof(tmp_str), "%04d%02d%02d%02d%02d%02d.000", currentTm->tm_year+1900, currentTm->tm_mon+1, currentTm->tm_mday, currentTm->tm_hour, currentTm->tm_min, currentTm->tm_sec); cout << "Subscriber current date:" << tmp_str << endl; tm tmpDateScheduleFrom, tmpDateScheduleTo; memset(&tmpDateScheduleFrom, 0, sizeof(tm)); memset(&tmpDateScheduleTo, 0, sizeof(tm)); //2010-04-08T11:00 tmpDateScheduleFrom.tm_sec = 0; tmpDateScheduleFrom.tm_min = 0; tmpDateScheduleFrom.tm_hour = 11; tmpDateScheduleFrom.tm_mday = 8; tmpDateScheduleFrom.tm_mon = 3; tmpDateScheduleFrom.tm_year = 110; //2010-04-08T12:00 tmpDateScheduleTo.tm_sec = 0; tmpDateScheduleTo.tm_min = 0; tmpDateScheduleTo.tm_hour = 12; tmpDateScheduleTo.tm_mday = 8; tmpDateScheduleTo.tm_mon = 3; tmpDateScheduleTo.tm_year = 110; time_t localFrom = mktime(&tmpDateScheduleFrom); time_t localTo = mktime(&tmpDateScheduleTo); cout << "Subscriber current timestamp:" << current_time << endl; cout << "Subscriber localFrom:" << localFrom << endl; cout << "Subscriber localTo:" << localTo << endl; return 0; } The results are the following: Subscriber current timestamp:1270715952 Subscriber current date:20100408113912.000 Subscriber current timestamp:1270715952 Subscriber localFrom:1270717200 Subscriber localTo:1270720800 Why the current subscriber timestamp (subscriber date and time: 2010-04-08T11:39:12) is not between the range localFrom (timestamp of date/time: 2010-04-08T11:00:00) and LocalTo (timestamp of date/time: 2010-04-08T12:00:00)?

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  • SVG: About using <defs> and <use> with variable text values

    - by Lukman
    Hi, I have the following SVG source code that generates a number of boxes with texts: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20050904/DTD/svg11.dtd"> <svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" width="600" height="600"> <defs> </defs> <title>Draw</title> <g transform="translate(50,40)"> <rect width="80" height="30" x="0" y="-20" style="stroke: black; stroke-opacity: 1; stroke-width: 1; fill: #9dc2de" /> <text text-anchor="middle" x="40">Text</text> </g> <g transform="translate(150,40)"> <rect width="80" height="30" x="0" y="-20" style="stroke: black; stroke-opacity: 1; stroke-width: 1; fill: #9dc2de" /> <text text-anchor="middle" x="40">Text 2</text> </g> <g transform="translate(250,40)"> <rect width="80" height="30" x="0" y="-20" style="stroke: black; stroke-opacity: 1; stroke-width: 1; fill: #9dc2de" /> <text text-anchor="middle" x="40">Text 3</text> </g> </svg> As you can see, I repeated the <g></g> three times to get three such boxes, when SVG has <defs> and <use> elements that allow reusing elements using id references instead of repeating their definitions. Something like: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20050904/DTD/svg11.dtd"> <svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" width="600" height="600"> <defs> <marker style="overflow:visible;fill:inherit;stroke:inherit" id="Arrow1Mend" refX="0.0" refY="0.0" orient="auto"> <path transform="scale(0.4) rotate(180) translate(20,0)" style="fill-rule:evenodd;stroke-width:2.0pt;marker-start:none;" d="M 0.0,-15.0 L -20.5,0.0 L 0.0,15.0 "/> </marker> <line marker-end="url(#Arrow1Mend)" id="systemthread" x1="40" y1="10" x2="40" y2="410" style="stroke: black; stroke-dasharray: 5, 5; stroke-width: 1; "/> </defs> <title>Draw</title> <use xlink:href="#systemthread" transform="translate(50,40)" /> <use xlink:href="#systemthread" transform="translate(150,40)" /> <use xlink:href="#systemthread" transform="translate(250,40)" /> </svg> Unfortunately I can't do this with the first SVG code since I need the texts to be different for each box, while the <use> tag simply duplicates 100% what's defined in <defs>. Is there any way to use <defs> and <use> with some kind of parameters/arguments mechanism like function calls?

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