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  • zlib memory usage / performance. With 500kb of data.

    - by unixman83
    Is zLib Worth it? Are there other better suited compressors? I am using an embedded system. Frequently, I have only 3MB of RAM or less available to my application. So I am considering using zlib to compress my buffers. I am concerned about overhead however. The buffer's average size will be 30kb. This probably won't get compressed by zlib. Anyone know of a good compressor for extremely limited memory environments? However, I will experience occasional maximum buffer sizes of 700kb, with 500kb much more common. Is zlib worth it in this case? Or is the overhead too much to justify? My sole considerations for compression are RAM overhead of algorithm and performance at least as good as zlib.

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  • How can I get page faults statistics from kernel

    - by osgx
    Hello How can I get page faults statistics from kernel for my application while it is running? What about other events, like inter-cpu migrations count in SMP nodes, or number of context switches? I want to count such events for various small parts of the program. Thanks.

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  • ASP.NET Memory Usage in IIS is FAR greater than in DevEnv. Is this normal?

    - by Tom
    Greetings! I have an ASP.NET app that scrapes data from a handful of external pages, parses the relevant bits and displays them in a table. Total data retrieved is 3-4MB and the resulting page is about 1MB. I am using synchronous WebRequest GetResponse for the retrieval, but the same problem existed using an asynchronous BeginGetResponse/EndGetResponse process. There is no database access, no session storage, no caching, but an in-memory list of about 100 objects (total 1MB of data), plus a good amount of AJAX (AjaxControlToolkit). This issue appears on the very first run of the app, even if I have restarted IIS. The issue: When I run the app on my dev computer, the maximum commit charge is about 1.5GB. The biggest user, measured by Task Manager's VM Size, is WebDev.WebServer.exe (600MB). The app runs perfectly. When I run it on my rent-a-server (IIS 7.5, 1GB RAM), the maximum commit charge is over 3.8GB. The biggest user is w3wp.exe at 2.7GB. IIS grinds to a halt and spits out a timed-out error page. Given my limited server budget and the hope of having multiple simultaneous users, I'm kind of in a panic. Is this normal? If I bump the server RAM up to 4GB, will that be enough? Will multiple users require even more memory? Could the culprit be AJAX or the list of objects? Thanks for any insight you can provide.

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  • tag statistics with rails

    - by poseid
    I am using the plugin: http://github.com/karmi/is_taggable How can I perform simple statistics on my tags, e.g. what's the most used tag? which tags are not used, etc.? With SQL I would do something like: select id, count(*) from taggings group by taggable_id; But I am not seeing how to do this with the plugin. Thanks!

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  • Apache/Passenger and cpulimit

    - by Dave Smylie
    I run a ruby on rails site that processes email - the email is dumped directly into the web app via a POST from postfix. At times I can get a burst of email coming in causing a prolonged surge in CPU usage making my VPS provider understandable unhappy with me. These emails don't need to be processed in a timely manner - they just need to be (eventually) processed. Obviously I can't just nice the process as that only looks at the cpu usage on my VPS and can't take into account the cpu usage on the other VPS's. I have found a utility called cpulimit that will you put hard limits on cpu usage for a particular process. (eg 20%). This seems ideal for this purpose, but I can't work out to integrate with apache/passenger. Passenger starts up a ruby process for each server and restarts them periodically. Each time the pid will change. Cpulimit needs to be given a pid number for it to act on. Anyone got any ideas how I could get passenger to fire off a call this command when it's starting up this particular virtual host?

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  • cpu load measure with hyperthreading on linux

    - by dronus
    How can I get the true usage of a multicore hyperthreading enabled cpu? For example lets consider a 2 core CPU, expressing 4 virtual cores. A single threaded workload would now show up as 100% in top, as one core of the virtual cores is completely used. The CPU and top work as expected, like there would be 4 real cores. With two threads however, the things get arkward: If all works well, they are balanced to the two real cores, so we got 200% usage: Two times 100% and two idle virtual cores, and are using all of the available CPU power. Seems ok to me. However, if the two threads would run on a single real core, they would show up as using two times 100%, that makes 200% virtual core usage. But on the real side, that would be one core sharing its power on the two threads, which are then using only one half of the total CPU power. So the usage numbers shown by top can not be used to measure the total CPU workload. I also wonder how hyperthreading balances two virtual on a real core. If two threads take a different amount of cycles, would the virtual cores 'adapt' so that both show a 100% load even if the real load differ?

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  • Extremely high mysqld CPU usage with no active queries

    - by RadarNyan
    I have a VPS running Ubuntu 12.04 LTS with LEMP stack, followed the guide from Linode Library (since I'm using a Linode) to setup, and everything worked fine until now. I don't know what's wrong, but my CPU usage just goes up since a week ago. Today things getting really bad - I got 74% CPU usage so I went check and found that mysqld taking too much CPU usage (somewhere around 30% ~ 80%) So I did some Google Search, tried disable InnoDB, restart mysql, reset ntp / system clock (Isn't this bug supposed to happen more than a year ago?!) and reboot my VPS, nothing helped. Even with mysql processlist empty, I still get mysqld CPU usage very high. I don't know what I missed and have totally no idea, any advice would be appreciated. Thanks in advance. Update: I got these from running "strace mysqld" write(2, "InnoDB: Unable to lock ./ibdata1"..., 44) = 44 write(2, "InnoDB: Check that you do not al"..., 115) = 115 select(0, NULL, NULL, NULL, {1, 0}^[[A^[[A) = 0 (Timeout) fcntl64(3, F_SETLK64, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0}, 0xbfa496f8) = -1 EAGAIN (Resource temporarily unavailable) hum... I did tried to disable InnoDB and it didn't fix this problem. Any idea? Update2: # ps -e | grep mysqld 13099 ? 00:00:20 mysqld then use "strace -p 13099", the following lines appears repeatedly: fcntl64(12, F_GETFL) = 0x2 (flags O_RDWR) fcntl64(12, F_SETFL, O_RDWR|O_NONBLOCK) = 0 accept(12, {sa_family=AF_FILE, NULL}, [2]) = 14 fcntl64(12, F_SETFL, O_RDWR) = 0 getsockname(14, {sa_family=AF_FILE, path="/var/run/mysqld/mysqld.sock"}, [30]) = 0 fcntl64(14, F_SETFL, O_RDONLY) = 0 fcntl64(14, F_GETFL) = 0x2 (flags O_RDWR) setsockopt(14, SOL_SOCKET, SO_RCVTIMEO, "\36\0\0\0\0\0\0\0", 8) = 0 setsockopt(14, SOL_SOCKET, SO_SNDTIMEO, "<\0\0\0\0\0\0\0", 8) = 0 fcntl64(14, F_SETFL, O_RDWR|O_NONBLOCK) = 0 setsockopt(14, SOL_IP, IP_TOS, [8], 4) = -1 EOPNOTSUPP (Operation not supported) futex(0xb786a584, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0xb786a580, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 futex(0xb7869998, FUTEX_WAKE_PRIVATE, 1) = 1 poll([{fd=10, events=POLLIN}, {fd=12, events=POLLIN}], 2, -1) = 1 ([{fd=12, revents=POLLIN}]) er... now I totally don't get it x_x help

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  • Random server lag, no CPU/mem/pagefile usage

    - by Kev
    We have a fairly new server running Windows 2003 SP2, and the past few days we've noticed random slowdowns. When I'm logged into the server over remote desktop while this is happening, or if I'm physically sitting at the server logged in, suddenly everything becomes extremely laggy. Any UI element I try to interact with takes upwards of ten seconds to react, and then responds very slowly. Then a minute later everything is quite snappy again. During this, I have Task Manager minimized to the tray, and there's no CPU usage. I open it up right after this happens, and there's very little CPU usage on the graph, and no memory or pagefile usage above normal. (Normal being 1.5 GB free in the case of memory.) This is what I see logged into the server, and then users start calling saying things are slow, timing out, and failing--anything to do with our server. No events in the Event Viewer around the times this happens. The context I'm working in (last thing I clicked, etc.) seems different every time--different programs active, different combinations of programs open. Never anything particularly stressful (like adding an event entry to a Cobian Backup configuration, or editing text in TextPad, which has been exceptionally stable in my extensive usage of it.) I would've thought it was just the server, but a family member's home PC (entirely separate) running WinXPSP3 had the same thing happen to it last night a few times. Is this some new behaviour introduced by the latest Windows Updates? Either way, where do I even start to look when nothing seems to be chewing up resources?

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  • Optimizing Apache for large file serving

    - by D_Guy13
    I have a random problem with Apache that I can't quite figure out, here is my setup, Windows Server 2008 R2, 64 Bit, 5GB RAM, SSD with 200 MB(Read/write) and Dual Core CPU @ 2.1 GHz A dump from mod-staus, Server Version: Apache/2.4.7 (Win32) mod_limitipconn/0.24 mod_antiloris/0.5.2 PHP/5.5.9 Server MPM: WinNT Apache Lounge VC11 Server Built: Nov 21 2013 20:13:01 Current Time: Thursday, 21-Aug-2014 23:38:06 W. Europe Daylight Time Restart Time: Thursday, 21-Aug-2014 20:30:47 W. Europe Daylight Time Parent Server Config. Generation: 1 Parent Server MPM Generation: 1 Server uptime: 3 hours 7 minutes 18 seconds Server load: -1.00 -1.00 -1.00 Total accesses: 283025 - Total Traffic: 1172.2 GB 25.2 requests/sec - 106.8 MB/second - 4.2 MB/request 62 requests currently being processed, 388 idle workers Serving large .zip & iso files using mod_xsendfile. (File size range 500 MB - 1.5 GB) The setup works and is running fine. CPU usage is very unstable, jumps all the time between 10% - 90% and the servers goes down when it hits 100%. In that case I have to hard restart the server. Server it outputting traffic at 30 Mbps. Is there anything else I should think about to get a more stable CPU usage? Is that CPU usage normal? Can switching to Linux help me achieve better CPU usage?

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  • SharePoint 2010 Replaceable Parameter, some observations…

    - by svdoever
    SharePoint Tools for Visual Studio 2010 provides a rudimentary mechanism for replaceable parameters that you can use in files that are not compiled, like ascx files and your project property settings. The basics on this can be found in the documentation at http://msdn.microsoft.com/en-us/library/ee231545.aspx. There are some quirks however. For example: My Package name is MacawMastSP2010Templates, as defined in my Package properties: I want to use the $SharePoint.Package.Name$ replaceable parameter in my feature properties. But this parameter does not work in the “Deployment Path” property, while other parameters work there, while it works in the “Image Url” property. It just does not get expanded. So I had to resort to explicitly naming the first path of the deployment path: : You also see a special property for the “Receiver Class” in the format $SharePoint.Type.<GUID>.FullName$. The documentation gives the following description:The full name of the type matching the GUID in the token. The format of the GUID is lowercase and corresponds to the Guid.ToString(“D”) format (that is, xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx). Not very clear. After some searching it happened to be the guid as declared in my feature receiver code: In other properties you see a different set of replaceable parameters: We use a similar mechanism for replaceable parameter for years in our Macaw Solutions Factory for SharePoint 2007 development, where each replaceable parameter is a PowerShell function. This provides so much more power. For example in a feature declaration we can say: Code Snippet <?xml version="1.0" encoding="utf-8" ?> <!-- Template expansion      [[ProductDependency]] -> Wss3 or Moss2007      [[FeatureReceiverAssemblySignature]] -> for example: Macaw.Mast.Wss3.Templates.SharePoint.Features, Version=1.0.0.0, Culture=neutral, PublicKeyToken=6e9d15db2e2a0be5      [[FeatureReceiverClass]] -> for example: Macaw.Mast.Wss3.Templates.SharePoint.Features.SampleFeature.FeatureReceiver.SampleFeatureFeatureReceiver --> <Feature Id="[[$Feature.SampleFeature.ID]]"   Title="MAST [[$MastSolutionName]] Sample Feature"   Description="The MAST [[$MastSolutionName]] Sample Feature, where all possible elements in a feature are showcased"   Version="1.0.0.0"   Scope="Site"   Hidden="FALSE"   ImageUrl="[[FeatureImage]]"   ReceiverAssembly="[[FeatureReceiverAssemblySignature]]"   ReceiverClass="[[FeatureReceiverClass]]"   xmlns="http://schemas.microsoft.com/sharepoint/">     <ElementManifests>         <ElementManifest Location="ExampleCustomActions.xml" />         <ElementManifest Location="ExampleSiteColumns.xml" />         <ElementManifest Location="ExampleContentTypes.xml" />         <ElementManifest Location="ExampleDocLib.xml" />         <ElementManifest Location="ExampleMasterPages.xml" />           <!-- Element files -->         [[GenerateXmlNodesForFiles -path 'ExampleDocLib\*.*' -node 'ElementFile' -attributes @{Location = { RelativePathToExpansionSourceFile -path $_ }}]]         [[GenerateXmlNodesForFiles -path 'ExampleMasterPages\*.*' -node 'ElementFile' -attributes @{Location = { RelativePathToExpansionSourceFile -path $_ }}]]         [[GenerateXmlNodesForFiles -path 'Resources\*.resx' -node 'ElementFile' -attributes @{Location = { RelativePathToExpansionSourceFile -path $_ }}]]     </ElementManifests> </Feature> We have a solution level PowerShell script file named TemplateExpansionConfiguration.ps1 where we declare our variables (starting with a $) and include helper functions: Code Snippet # ============================================================================================== # NAME: product:\src\Wss3\Templates\TemplateExpansionConfiguration.ps1 # # AUTHOR: Serge van den Oever, Macaw # DATE  : May 24, 2007 # # COMMENT: # Nota bene: define variable and function definitions global to be visible during template expansion. # # ============================================================================================== Set-PSDebug -strict -trace 0 #variables must have value before usage $global:ErrorActionPreference = 'Stop' # Stop on errors $global:VerbosePreference = 'Continue' # set to SilentlyContinue to get no verbose output   # Load template expansion utility functions . product:\tools\Wss3\MastDeploy\TemplateExpansionUtil.ps1   # If exists add solution expansion utility functions $solutionTemplateExpansionUtilFile = $MastSolutionDir + "\TemplateExpansionUtil.ps1" if ((Test-Path -Path $solutionTemplateExpansionUtilFile)) {     . $solutionTemplateExpansionUtilFile } # ==============================================================================================   # Expected: $Solution.ID; Unique GUID value identifying the solution (DON'T INCLUDE BRACKETS). # function: guid:UpperCaseWithoutCurlies -guid '{...}' ensures correct syntax $global:Solution = @{     ID = GuidUpperCaseWithoutCurlies -guid '{d366ced4-0b98-4fa8-b256-c5a35bcbc98b}'; }   #  DON'T INCLUDE BRACKETS for feature id's!!! # function: GuidUpperCaseWithoutCurlies -guid '{...}' ensures correct syntax $global:Feature = @{     SampleFeature = @{         ID = GuidUpperCaseWithoutCurlies -guid '{35de59f4-0c8e-405e-b760-15234fe6885c}';     } }   $global:SiteDefinition = @{     TemplateBlankSite = @{         ID = '12346';     } }   # To inherit from this content type add the delimiter (00) and then your own guid # ID: <base>00<newguid> $global:ContentType = @{     ExampleContentType = @{         ID = '0x01008e5e167ba2db4bfeb3810c4a7ff72913';     } }   #  INCLUDE BRACKETS for column id's and make them LOWER CASE!!! # function: GuidLowerCaseWithCurlies -guid '{...}' ensures correct syntax $global:SiteColumn = @{     ExampleChoiceField = @{         ID = GuidLowerCaseWithCurlies -guid '{69d38ce4-2771-43b4-a861-f14247885fe9}';     };     ExampleBooleanField = @{         ID = GuidLowerCaseWithCurlies -guid '{76f794e6-f7bd-490e-a53e-07efdf967169}';     };     ExampleDateTimeField = @{         ID = GuidLowerCaseWithCurlies -guid '{6f176e6e-22d2-453a-8dad-8ab17ac12387}';     };     ExampleNumberField = @{         ID = GuidLowerCaseWithCurlies -guid '{6026947f-f102-436b-abfd-fece49495788}';     };     ExampleTextField = @{         ID = GuidLowerCaseWithCurlies -guid '{23ca1c29-5ef0-4b3d-93cd-0d1d2b6ddbde}';     };     ExampleUserField = @{         ID = GuidLowerCaseWithCurlies -guid '{ee55b9f1-7b7c-4a7e-9892-3e35729bb1a5}';     };     ExampleNoteField = @{         ID = GuidLowerCaseWithCurlies -guid '{f9aa8da3-1f30-48a6-a0af-aa0a643d9ed4}';     }; } This gives so much more possibilities, like for example the elements file expansion where a PowerShell function iterates through a folder and generates the required XML nodes. I think I will bring back this mechanism, so it can work together with the built-in replaceable parameters, there are hooks to define you custom replacements as described by Waldek in this blog post.

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  • Monitoring Bandwidth Usage (Per Internal IP) - Cisco ASA 5505

    - by Joseph Sturtevant
    I manage a small network with a Cisco ASA 5505 and a shared DSL connection. I would like to be able monitor the bandwidth usage of the various users/devices on my network (by IP). Can I do that using the ASA? Has anyone got this working? What is the best way to do this? Some Ideas I Have Seen Online: SNMP with a tool like Cacti Does this give per IP usage with an ASA or just overall usage? Netflow with a tool like ntop Couldn't get this to work. It seems that the Netflows sent by ASA are not exactly standard. Ntop receives them, but doesn't seem to know what do with them.

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  • High CPU usage on Linux machine

    - by user305210
    I have a piece of java code running on two different machines, but on one of the linux machines, the code uses alot of CPU (close to 100% cpu usage). On the other machine the same code uses less cpu (under 3 to 4%). The machine where cpu usage is high, is a more powerful machine, more CPU and and more memory. This has started happening recently and performance on the machine with high cpu usage has degraded significantly. I am wondering if anyone has any ideas why something like this could happen, possible causes behind this etc. any guesses? No recent changes in hardware were made, no recent code updates... Thank you.

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  • Memory usage on debian webserver keeps going up

    - by Steven De Groote
    my webserver is running apache 1.3.x for a PHP application, along with mysql on the same machine. Most of the time it runs fine, CPU usage still with nice margin, but somehow memory usage keeps growing throughout uptime. While it looks like it is chunked from time to time, I've had moments my server going down because it's out of memory. Restarting apache or mysql only reduced memusage by 100M. Attached is an overview of monthly memory usage. The 2 massive drops are server restarts after out-of-memory situations. http://imageshack.us/photo/my-images/51/memorymonth.png/ Any explanations for his behaviour or how I could solve this? Thanks! Steven

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  • SOLR high CPU usage in amazon EC2

    - by user644745
    I installed solr-3.6 in my local windows box and it worked fine. I installed solr-4.0 in amazon ec2 linux large instance and the cpu usage shot upto 100%. It maintained at 80-90% average cpu power. I thought it could be because of 4.0, So I installed 3.6 in EC2 again. But again the CPU usage was 80-90% average. With both the versions, solr works in EC2. dont know why CPU usage is so high. i started the solr server using "sudo nohup java -jar start.jar &" In my local box java 1.7 is installed and in EC2 it is 1.6.0_24. I have mapped solr dir to an EBS volume. /dev/mapper/vg1-solr 8361916 1935928 6342128 24% /home/ec2-user/SOLR/solr/example/solr Is there any known issue ?

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  • Intuitive view of what's using the hard drive so much on Windows 7?

    - by Aren Cambre
    Sometimes my hard drive usage is near 100%, and I have no idea what is causing it. Are there any utilities that can help diagnose excessive hard drive usage and have as intuitive of an interface as Task Manager's Processes tab, which I can sort by CPU usage? I am aware of using procmon, of adding columns to Task Manager's Processes tab like I/O Read Bytes and I/O Write Bytes, and using Resource Monitor's Disk tab. Too often, these don't give me useful information or clearly identify a single process that is hogging the disk.

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  • High memory usage for dummies

    - by zaf
    I've just restarted my firefox web browser again because it started stuttering and slowing down. This happens every other day due to (my understanding) of excessive memory usage. I've noticed it takes 40M when it starts and then, by the time I notice slow down, it goes to 1G and my machine has nothing more to offer unless I close other applications. I'm trying to understand the technical reasons behind why its such a difficult problem to sol ve. Mozilla have a page about high memory usage: http://support.mozilla.com/en-US/kb/High+memory+usage But I'm looking for a slightly more in depth and satisfying explanation. Not super technical but enough to give the issue more respect and please the crowd here. Some questions I'm already pondering (they could be silly so take it easy): When I close all tabs, why doesn't the memory usage go all the way down? Why is there no limits on extensions/themes/plugins memory usage? Why does the memory usage increase if it's left open for long periods of time? Why are memory leaks so difficult to find and fix? App and language agnostic answers also much appreciated.

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  • Facebook Connect Statistics

    - by thekevinscott
    All, A client is asking for Facebook Connect statistical data. Specifically, how many people have shared a link to their wall. I have a Facebook app setup but I am having trouble interpreting the statistical data. Do Facebook apps collect this data, or can anyone think of any way of gleaning this data from the past month, from server logs or something? For instance, can I look at the logs for xd_receiver.htm and see usage patterns from that, or something?

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  • Windows 8.1 Update 1 Disk Usage 100%

    - by Gookjin Jeong
    Background Information / Computer Specs I have a 14-inch Samsung Series 5 Ultra. Core i5 CPU, 750GB HDD, 8GB RAM, Intel HD Graphics 4000. I've had the computer for about 1.5 years with no major problems. Problem The issue appeared at the beginning of April this year, when I updated the OS to Windows 8.1 Update 1 (not from 8 to 8.1). After being on continually (except for at night, when I put it on sleep mode) for about 48 hours, the disk usage as seen by Task Manager hits 100%. When this happens, everything from opening/closing applications to typing and even bringing up the start screen by pressing the Windows key becomes extremely slow. The only way to make the disk usage decrease is to restart the computer. Then the problem repeats. I've used my current laptop (as well as my previous laptops) this way -- putting it on sleep mode at night and restarting it only when Windows needs to install updates -- for a long time. So I know the 100% disk usage is not due to the way I use the computer. The thing that causes the spike varies. Sometimes it's System, sometimes it's one of the various applications I installed (e.g. Chrome, Evernote, Spotify, Wunderlist, iTunes, etc.), and sometimes it's Antimalware Service Executable, etc. Tried Solutions I think I tried almost every solution out there for this problem: Running the check disk command (chkdsk /b /f /v /scan c:) from Admin Command Prompt Running Windows Memory Diagnostic Disabling Superfetch and Windows Search from services.msc Running "Fix problems with Windows Update" from Control Panel -- Troubleshooting Updating and rolling back the graphics driver (Intel HD 4000) Disabling "Use hardware acceleration when available" from Chrome settings Disabling Intel Rapid Storage Technology Running the SFC /SCANNOW command as recommended here Running a quick scan & a full scan from Windows Defender (no threats found) Taking the hard drive out and putting it back Refreshing the computer, from the Update and recovery -- Recovery option in Windows settings NONE of the above worked for me. I was about to give up but then noticed that one of the main culprits of the disk usage spike, as shown in the "Disk Activity" section of the Resource Monitor, was C:\System (pagefile.sys). I googled around and found that one of the recommended solutions was to disable pagefile. I then went to **Control Panel -- System and Security -- System -- Advanced system settings -- Advanced tab -- Performance settings -- Advanced tab -- "Change" under Virtual memory and discovered that the number for "Currently allocated" at the bottom was 1280MB, although the number for "Recommended" was 4533MB. I immediately changed it to 4533MB and checked my family members' computers to see what the numbers were like. All of theirs had a currently allocated space that was only slightly smaller than the recommended space. See screenshot below: This might fix the problem. I'll have to wait a couple more days.But if it doesn't, what in the world should I do next? I'm guessing the hard drive isn't failing because This computer is less than 2 years old; and Speccy says that the status of the HDD is good. Update 5/27/2014 The "4533MB" solution did not work. I had to reboot the computer about 30 minutes ago because the disk usage again hit 100%. When I opened Resource Monitor the C:\System (pagefile.sys) again was shown to be the culprit. I have now disabled pagefile entirely via the same window shown above in the screenshot. The number for "currently allocated" is now 0MB. Will update again in a couple days, or if the problem occurs again, whichever comes sooner.

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  • How do web crawlers affect site statistics?

    - by LM
    What are ways in which web crawlers (both from search engines and non-search engines) could affect site statistics (e.g., when doing AB-testing different page variations)? And what are ways to take care of these problems? For example: Do a lot of people writing web crawlers often delete their cookies and mask their IPs, so that web crawlers often show up as different users each time they crawl the site? What are heuristics to use to recognize that something is a bot? (I'm guessing any sophisticated enough bot can be indistinguishable from a real user, if it wants to -- is this correct?)

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  • PHP/MySQL database connection priority?

    - by Josh
    Hello, I have a production database where usage statistics for a service we're working on. I use php to periodically roll up different resolutions (day, week, month, year) of interesting statistics in buckets dictated by the resolution. The php application I've written "completes" its data when its run, such that it will calculate all the rolled-up statistics for the resolutions and periods since it was last run. This is useful if we want to turn this off to debug database performance issues, because I can turn it back on and have it complete its data set. The problem I have, is the calculations are fairly intensive and drive the QPS of the production database server up. Is there a way to set a "priority" on a particular database connection so that it will only use "off-cycles" to do these calculations? Maybe a proper response would be to replicate the tables I'm working on into a different stats database, but, unfortunately I don't have the resources in place to attempt such a thing (yet). Thanks in advance for any help, Josh

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  • How do I regenerate statistics in Openx?

    - by Martin Bauer
    ue to faulty hardware, statistics generated over a 2 week period were significantly higher than normal (10000 times higher than normal). After moving the application to a new server, the problem rectified itself. The issue I have is that there are 2 weeks of stats that are clearly wrong. I have checked the raw impressions table for the affected fortnight and it seems to be correct (ie. stats per banner per day match the average for the previous month). Looking at the intermediate & summary impressions tables, the values are inflated. I understand from the openx forum (http://forum.openx.org/index.php?s=7796fd9dae40e020a010773746f3ada9&showtopic=503424297) it's possible to regenerate stats from the raw data but it will only regenerate stats per hour, meaning regenerating stats for 2 weeks would be very time consuming. Is there another, more efficient way to regenerate the stats from the raw data for the affected fortnight?

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  • Need some help understanding IO Statistics

    - by Abe Miessler
    I have a query that has a very costly INDEX SEEK operation in the execution plan. In order to track down the cause i set IO STATISTICS on and ran it. In the problem section it gave the following statistics: Table '#TempStudents_Enrollment2_____________________________________000000004D5F'. Scan count 0, logical reads 60, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#TempRace2______________________________________________000000004D58'. Scan count 1, logical reads 1, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'RefRace'. Scan count 120, logical reads 240, physical reads 1, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'RefFedEnctyRaceCatg'. Scan count 18, logical reads 36, physical reads 2, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#43B0BA0F'. Scan count 1, logical reads 60, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#42BC95D6'. Scan count 1, logical reads 60, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#41C8719D'. Scan count 1, logical reads 60, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#40D44D64'. Scan count 1, logical reads 60, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#LEA2_________________________________________________000000004D56'. Scan count 1, logical reads 60, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#39332B9C'. Scan count 1, logical reads 60, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#School2________________________________________________000000004D57'. Scan count 1, logical reads 29164, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#GenderKey______________________________________________000000004D5A'. Scan count 1, logical reads 29164, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#LangAcqKey_____________________________________________000000004D5B'. Scan count 1, logical reads 29164, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#TransferCatKey___________________________________________000000004D5C'. Scan count 1, logical reads 29164, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#ResCatKey______________________________________________000000004D5D'. Scan count 1, logical reads 29164, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'RPT_SnapShot_1_4_StuPgm_Denorm'. Scan count 2344954, logical reads 4992518, physical reads 16, read-ahead reads 8, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#3FE0292B'. Scan count 1, logical reads 2344954, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'RPT_SnapShot_1_4_StuEnrlmt_Denorm'. Scan count 20, logical reads 87679, physical reads 0, read-ahead reads 87425, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table '#GradeKey_______________________________________________000000004D59'. Scan count 1, logical reads 1, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. What should I look for in here when i'm looking to improve the performance? The line with over 2 million for the Scan count looked suspicious to me but I really don't know. Does anyone see anything here that i should look into in more detail?

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  • Streaming audio/video in a publicly-hosted server increases bandwith usage

    - by Eka
    I have a website hosted in a public server (withoud any streaming content) ,using public hosting instead of private because its cheaper. But in public hosting their are limitations when compared to private hosting such as monthly bandwidth usage (1 GB), disk space, cpu usage etc. I am planning to embedd videos and audios (from other websites like youtube) to my already existing website. My question is if a client streams a embedded video/audio (hosted in another website) from my website any change in bandwidth occurs.

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  • Windows 2003 X64 Std page file usage

    - by duhaas
    Just trying to understand why I'm seeing what I'm seeing on this system. Pagefile performance counters are telling me i'm @ about 1.5% used with my page file, settings for the file are 2GB-4GB, but task manager was showing 13GB usage: Oddly enough, it just sunk down: This machine has IBM DB2 9.5 workgroup edition running on it. Thoughts??? Actually, just learned the developer had just stopped DB2, hence the huge drop, just not understand the difference in the PF usage in task manager vs perf counters?

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  • linux disk usage report inconsistancy after removing file. cpanel inaccurate disk usage report

    - by brando
    relevant software: Red Hat Enterprise Linux Server release 6.3 (Santiago) cpanel installed 11.34.0 (build 7) background and problem: I was getting a disk usage warning (via cpanel) because /var seemed to be filling up on my server. The assumption would be that there was a log file growing too large and filling up the partition. I recently removed a large log file and changed my syslog config to rotate the log files more regularly. I removed something like /var/log/somefile and edited /etc/rsyslog.conf. This is the reason I was suspicious of the disk usage report warning issued by cpanel that I was getting because it didn't seem right. This is what df was reporting for the partitions: $ [/var]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 9.9G 511M 8.9G 6% / tmpfs 5.9G 0 5.9G 0% /dev/shm /dev/sda1 99M 53M 42M 56% /boot /dev/sda8 883G 384G 455G 46% /home /dev/sdb1 9.9G 151M 9.3G 2% /tmp /dev/sda3 9.9G 7.8G 1.6G 84% /usr /dev/sda5 9.9G 9.3G 108M 99% /var This is what du was reporting for /var mount point: $ [/var]# du -sh 528M . clearly something funky was going on. I had a similar kind of reporting inconsistency in the past and I restarted the server and df reporting seemed to be correct after that. I decided to reboot the server to see if the same thing would happpen. This is what df reports now: $ [~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 9.9G 511M 8.9G 6% / tmpfs 5.9G 0 5.9G 0% /dev/shm /dev/sda1 99M 53M 42M 56% /boot /dev/sda8 883G 384G 455G 46% /home /dev/sdb1 9.9G 151M 9.3G 2% /tmp /dev/sda3 9.9G 7.8G 1.6G 84% /usr /dev/sda5 9.9G 697M 8.7G 8% /var This looks more like what I'd expect to get. For consistency this is what du reports for /var: $ [/var]# du -sh 638M . question: This is a nuisance. I'm not sure where the disk usage reports issued by cpanel get their info but it clearly isn't correct. How can I avoid this inaccurate reporting in the future? It seems like df reporting wrong disk usage is a strong indicator of the source problem but I'm not sure. Is there a way to 'refresh' the filesystem somehow so that the df report is accurate without restarting the server? Any other ideas for resolving this issue?

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