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  • Garbage collection in Perl

    - by srikfreak
    Unlike Java, Perl uses reference count for garbage collection. I have tried searching some previous questions which speak about C++ RAII and smart pointers and Java GC but have not understood how Perl deals with the circular referencing problem. Can anyone explain how Perl's garbage collector deals with circular references? Is there any way to reclaim circular referenced memory which are no longer used by the program or does Perl just ignores this problem altogether?

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  • Is garbage collection supported for iPhone applications?

    - by Mustafa
    Does the iPhone support garbage collection? If it does, then what are the alternate ways to perform the operations that are performaed using +alloc and -init combination: NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:xmlData]; UIImage *originalImage = [[UIImage alloc] initWithData:data]; detailViewController = [[[DetailViewController alloc] initWithNibName:@"DetailView bundle:[NSBundle mainBundle]] autorelease]; ... and other commands. Thank you in advance for any help or direction that you can provide.

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  • How much does Javascript garbage collection affect performance?

    - by Long Ouyang
    I'm writing a bunch of scripts that present images serially (e.g. 1 per second) and require the user to make either a keyboard or mouse response. I'm using closures to handle the timing of image presentation and user input. This causes garbage collection to happen pretty frequently and I'm wondering if that will affect the performance (viz. timing of image presentation).

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  • Delay garbage collection?

    - by GeoffreyF67
    I'm using chrome (the dev version for my mac). I was looking at the timeline for my page loading and I saw that there is a 150ms delay due to some garbage collection taking place while loading the page. http://cl.ly/cce10619c698a5b276e2 It's the yellow line. I was curious if there's any way to stop this, delay it, whatever so I get the page to load faster? G-Man

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  • Appropriate collection for variable-depth list?

    - by George R
    If I wanted to have a collection that described the (recursive) contents of a root directory, including directories and files, how would I store them? Or do I need to come up with an object that holds: -Current directory -Parent directory -Files in directory ..and slap them all in one big list and manually work out the relationship at runtime from each entries Parent directory.

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  • JVM memory management & garbage collection book?

    - by Max
    Hi. Could anyone advice a book (or any other source) that would thoroughly reveal internals of JVM memory management & garbage collection (optimization, work, circular references, pecularities, discussions for various JVM impls...)? [What I've found so far are separate articles devoted to various aspects but no weighty tome :). Some good materials for Hotspot implementation are here. ] Thanks a lot for any advice you give.

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  • Resolving TFS_SCHEMA_VERSION Errors In Team Foundation Server 2010 Collection Databases

    - by Jeff Ferguson
    I recently backed up a Team Foundation Server 2010 project collection database and restored it onto another server. All of that went well, until I tried to use the restored database on the new server. As it turns out, the old server was running the Release Candidate of TFS 2010 and the new server is running the RTM version of TFS 2010. I ended up with an error message shown on the new server's Team Web Access site about the project collection's TFS_SCHEMA_VERSION property not containing the appropriate value. As it turns out, TFS_SCHEMA_VERSION is an extended property on the project collection database. I ran the following SQL script against the project collection database restored onto the new server: EXEC [Tfs_DefaultCollection].sys.sp_dropextendedproperty @name=N'TFS_PRODUCT_VERSION' GO EXEC [Tfs_DefaultCollection].sys.sp_addextendedproperty @name=N'TFS_PRODUCT_VERSION', @value=N'10.0.30319.1' GO EXEC [Tfs_DefaultCollection].sys.sp_dropextendedproperty @name=N'TFS_SCHEMA_VERSION' GO EXEC [Tfs_DefaultCollection].sys.sp_addextendedproperty @name=N'TFS_SCHEMA_VERSION', @value=N'Microsoft Team Foundation Server 2010 (RTM)' GO Now, all is well. I can now navigate to http://newserver:8080/tfs/ and see the restored project collection and its contents.

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  • Getting SSL to work with Apache/Passenger on OSX

    - by jonnii
    I use apache/passenger on my development machine, but need to add SSL support (something which isn't exposed through the control panel). I've done this before in production, but for some reason I can't seem to get it work on OSX. The steps I've followed so far are from a default apache osx install: Install passenger and passenger preference pane. Add my rails app (this works) Create my ca.key, server.crt and server.key as detailed on the apple website. At this point I need to start editing the apache configs, so I added: # Apache knows to listen on port 443 for ssl requests. Listen 443 Listen 80 I thought I'd try editing the passenger pref pane generated config first to get everything working, when I add: It starts off looking like this <VirtualHost *:80> ServerName myapp.local DocumentRoot "/Users/jonnii/programming/ruby/myapp/public" RailsEnv development <Directory "/Users/jonnii/programming/ruby/myapp/public"> Order allow,deny Allow from all </Directory> </VirtualHost> I then append this: <VirtualHost *:443> ServerName myapp.local DocumentRoot "/Users/jonnii/programming/ruby/myapp/public" RailsEnv development <directory "/Users/jonnii/programming/ruby/myapp/public"> Order allow,deny Allow from all </directory> # SSL Configuration SSLEngine on SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP SSLOptions +FakeBasicAuth +ExportCertData +StdEnvVars +StrictRequire #Self Signed certificates SSLCertificateFile /private/etc/apache2/ssl.key/server.crt SSLCertificateKeyFile /private/etc/apache2/ssl.key/server.key SSLCertificateChainFile /private/etc/apache2/ssl.key/ca.crt SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0 </VirtualHost> The files referenced all exist (I doubled checked that), but now when I restart my apache I can't even get to myapp.local. However apache can still server the default page when I click on it in the sharing preference panel. Any help would be greatly appreciated.

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  • Load Spikes on a Apache MySQL Server with Wordpress MU

    - by Vikram Goyal
    Hi there, I am trying to investigate the reasons for some mysterious load spikes on a Linux Apache server (2.2.14) running PHP 5.2.9 on a dedicated server with enough processing power and memory. My primary web application is a Wordpress MU (2.9.2) installation. I have investigated and ruled out DOS attack, MySQL or Apache configuration issues. The log files don't give me anything of interest, except to tell me that there is severe load. The load (which can go up to 100) just seems to come and go. It helps that I have a script that checks every 3 minutes for the load, and restarts Apache. Restarting it helps, and the server comes back, till it happens again. There seems to be no set time frame, or visitor numbers on the site that can trigger this. Even a low number of concurrent visitors (20) can trigger it. I am almost convinced that there is a rewrite loop somewhere that is causing Apache to go mad. Apache is trying to serve something that is causing it to spawn more and more processes till it keels over. My question is: Given that I am convinced that this is a rewrite issue or something similar, how can I try and figure out what the issue is? What should I monitor? Apache logs are voluminous, and not very helpful. Of course, if this is not the issue, then at least knowing what to look for will help me eliminate this as an issue and look for something else. Thanks! Vikram

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  • Django website on Apache with wsgi failing

    - by notagain
    I have a website I've built in django that I'm trying to get working on our corporate Apache server (on debian) for our intranet at my workplace. Unfortunately, Apache keeps returning server errors whenever I try to navigate to my site. Although I can navigate to the statics folder. My Apache config and wsgi script look like the following... lbirdf.wsgi import os import sys sys.path.append('/home/lbi/rdfweb/web') sys.path.append('/home/lbi/rdfweb/lbirdf') os.environ['DJANGO_SETTINGS_MODULE'] = 'lbirdf.settings_production' import django.core.handlers.wsgi application = django.core.handlers.wsgi.WSGIHandler() Apache config Listen 8080 <VirtualHost *:8080> ServerName server1 WSGIScriptAlias /rdfweb /home/lbi/rdfweb/web/lbirdf/apache/lbirdf.wsgi Alias /statics /home/lbi/rdfweb/web/lbirdf/statics Alias /admin_media /home/lbi/rdfweb/web/lbirdf/admin_media <Directory /home/lbi/rdfweb/web/lbirdf/apache> Order allow,deny Allow from all </Directory> <Directory /home/lbi/rdfweb/web/lbirdf/admin_media> Order allow,deny Allow from all </Directory> </VirtualHost> Any ideas on where I might be going wrong?

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  • What's the most efficient way to load data from a file to a collection on-demand?

    - by Dan
    I'm working on a java project that will allows users to parse multiple files with potentially thousands of lines. The information parsed will be stored in different objects, which then will be added to a collection. Since the GUI won't require to load ALL these objects at once and keep them in memory, I'm looking for an efficient way to load/unload data from files, so that data is only loaded into the collection when a user requests it. I'm just evaluation options right now. I've also thought of the case where, after loading a subset of the data into the collection, and presenting it on the GUI, the best way to reload the previously observed data. Re-run the parser/Populate collection/Populate GUI? or probably find a way to keep the collection into memory, or serialize/deserialize the collection itself? I know that loading/unloading subsets of data can get tricky if some sort of data filtering is performed. Let's say that I filter on ID, so my new subset will contain data from two previous analyzed subsets. This would be no problem is I keep a master copy of the whole data in memory. I've read that google-collections are good and efficient when handling big amounts of data, and offer methods that simplify lots of things so this might offer an alternative to allow me to keep the collection in memory. This is just general talking. The question on what collection to use is a separate and complex thing. Do you know what's the general recommendation on this type of task? I'd like to hear what you've done with similar scenarios. I can provide more specifics if needed.

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  • Apache: VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not sup

    - by user45761
    Hi, when i add the line below to /etc/apache2/apache2.conf I get the error belower when i restart apache: Include /usr/share/doc/apache2.2-common/examples/apache2/extra/httpd-vhosts.conf [Mon Jun 14 12:16:47 2010] [error] VirtualHost *:80 -- mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results [Mon Jun 14 12:16:47 2010] [warn] NameVirtualHost *:80 has no VirtualHosts This is my httpd-vhosts.conf file: # # Use name-based virtual hosting. # NameVirtualHost *:80 # # VirtualHost example: # Almost any Apache directive may go into a VirtualHost container. # The first VirtualHost section is used for all requests that do not # match a ServerName or ServerAlias in any <VirtualHost> block. <VirtualHost *:80> ServerName tirengarfio.com DocumentRoot /var/www/rs3 <Directory /var/www/rs3> AllowOverride All Options MultiViews Indexes SymLinksIfOwnerMatch Allow from All </Directory> Alias /sf /var/www/rs3/lib/vendor/symfony/data/web/sf <Directory "/var/www/rs3/lib/vendor/symfony/data/web/sf"> AllowOverride All Allow from All </Directory> </VirtualHost> Any idea? Regards Javi

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  • Configuring ASP.NET MVC2 on Apache 2.2 using mod_aspdotnet

    - by user40684
    Trying to get an MVC2 website to run on Apache 2.2 web server (running on Windows) that utilizes the mod_aspdotnet module. Have several ASP.NET Virtual Hosts running, trying to add another. MVC2 has NO default page (like the first version of MVC had e.g default.aspx). I have tried various changes to the config: commented out 'DirectoryIndex', changed it to '/'. Set 'ASPNET' to 'Virtual', will not load first page, always get: '403 Forbidden, You don't have permission to access / on this server.' Below is from my http.conf: LoadModule aspdotnet_module "modules/mod_aspdotnet.so" AddHandler asp.net asax ascx ashx asmx aspx axd config cs csproj licx rem resources resx soap vb vbproj vsdisco webinfo <IfModule aspdotnet_module> # Mount the ASP.NET /asp application #AspNetMount /MyWebSiteName "D:/ApacheNET/MyWebSiteName.com" Alias /MyWebSiteName" D:/ApacheNET/MyWebSiteName.com" <VirtualHost *:80> DocumentRoot "D:/ApacheNET/MyWebSiteName.com" ServerName www.MyWebSiteName.com ServerAlias MyWebSiteName.com AspNetMount / "D:/ApacheNET/MyWebSiteName.com" # Other directives here <Directory "D:/ApacheNET/MyWebSiteName.com"> Options FollowSymlinks ExecCGI AspNet All #AspNet Virtual Files Directory Order allow,deny Allow from all DirectoryIndex default.aspx index.aspx index.html #default the index page to .htm and .aspx </Directory> </VirtualHost> # For all virtual ASP.NET webs, we need the aspnet_client files # to serve the client-side helper scripts. AliasMatch /aspnet_client/system_web/(\d+)_(\d+)_(\d+)_(\d+)/(.*) "C:/Windows /Microsoft.NET/Framework/v$1.$2.$3/ASP.NETClientFiles/$4" <Directory "C:/Windows/Microsoft.NET/Framework/v*/ASP.NETClientFiles"> Options FollowSymlinks Order allow,deny Allow from all </Directory> </IfModule> Has anyone successfully run MVC2 (or the first version of MVC) on Apache with the mod_aspdotnet module? Thanks !

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  • Problem posting multipart form data using Apache with mod_proxy to a mongrel instance

    - by Ryan E
    I am attempting to simulate my site's production environment as closely as I can on my local machine. This is a rails site that uses Apache w/ mod_proxy to forward requests to a mongrel cluster. On my Mac OSX Leopard machine, I have the default install of apache running and have configured a vhost to use mod_proxy to to forward requests to a local running mongrel instance on port 3000. <Proxy balancer://mongrel_cluster-development> BalancerMember http://127.0.0.1:3000 </Proxy> For the most part, this is working fine. I can browse my development site using the ServerName of the vhost I configured and can confirm that requests are being properly forwarded to the mongrel instance. However, there is a page on the site that has a multipart form that is used to upload an image to the server. When I post this form, there is a delay of about 5 minutes and the browser ultimately returns a Bad Request Your browser sent a request that this server could not understand. In the error log for my vhost: [Tue Sep 22 09:47:57 2009] [error] (70007)The timeout specified has expired: proxy: prefetch request body failed to 127.0.0.1:3000 (127.0.0.1) from ::1 () This same form works fine if I browse directly to the mongrel instance (http://127.0.0.1:3000). Anybody have any idea what the problem might be and how to fix it? If there is any important information that I neglected to include, post a comment, and I can add to this question. Note: Upon further investigation, this appears to be a problem specific to Safari. The form works fine in Firefox.

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  • Setup site folders on Apache and PHP

    - by Cobus Kruger
    I'm trying to set up my first Apache server on my Windows PC at home and I have real trouble finding out which configuration settings go where. I downloaded and installed XAMPP which seemed to get everything nicely set up and can see a working website on http://localhost. So far so good. The point of this is to develop a website of course, and to make my life easier (irony?), I wanted to let the web site root point to my Eclipse project folder. So I opened httpd-vhosts.conf, uncommented a VirtualHost block and changed its DocumentRoot to my local path. Now when I try to load http://localhost I get a 403 (Access denied) error. So where do I configure permissions for my folder? And is that all I need to let my site run from the folder specified or am I going to have to clear another hurdle? Update: I tried to simplify things a little, so I reinstalled XAMPP and got back to a working http://localhost. Then I confirmed that httpd-vhosts.conf is included in httpd.conf and made the following changes to httpd-vhosts.conf: Uncommented the line NameVirtualHost *:80 Added a virtual host shown below. Restarted Apache and saw the expected page on http://localhost <VirtualHost *:80> DocumentRoot "C:/xampp/htdocs/" ServerName localhost ErrorLog "logs/dummy-host2.localhost-error.log" CustomLog "logs/dummy-host2.localhost-access.log" combined </VirtualHost> I then created a new folder named C:\testweb, added an index.html file and changed the DocumentRoot line shown above. For all intents and purposes I would then expect the two configurations to be equivalent. But this setup gives me an error 403. Even though the C:\testweb folder already had the same permissions as the C:\xampp\htdocs folder, I then went further and gave the Everyone group full control of C:\testweb and got exactly the same problem. So what did I miss?

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  • how does svn work with apache?

    - by ajsie
    i've got ubuntu installed with lamp. im using webdav to upload/download files to/from the ubuntu web server, after i have edited the php source files in netbeans. however, i wonder what is best practice for editing source files and committing these changes to the new website. cause if we are 2-3 developers, i guess we have to use svn. but i have never used it before so i wonder how it works. should i install it and then select the /var/www (apaches webroot) as the repository folder? then when i check in, all the changes will apply immediately? could someone please explain following steps: how to download, edit the source files, upload the files and see the new changes in the website. cause i have only worked with a local apache before, and it was only me. now there will be some more programmers so i have to set up a decent, central environment for this, and have to know how netbeans, svn, webdav and apache works all together. thanks!

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  • Problem configuring Apache/Wordpress on subdomain

    - by friism
    I have two servers (one LAMP, one Windows) and one website with an associated blog. I'm running the main site on the Windows server, and the blog on the LAMP server, using Wordpress. The main site is accessed at http://folketsting.dk (it's in Danish -- sorry), the blog is accessed at http://blog.folketsting.dk (this link is bad, read on). The main site works fine. The blog works, except for the frontpage. Example of working post: http://blog.folketsting.dk/2009/10/09/ftlive/. The frontpage of the blog (http://blog.folketsting.dk) shows html from http://folketsting.dk however (except for the css and javascript). In fact, any other URL than the frontpage "works", and gets served by Wordpress e.g. http://blog.folketsting.dk/foo. I cannot -- for the life of me -- understand how the LAMP server running http://blog.folketsting.dk manages to serve up content generated by the Windows server running http://folketsting.dk. Looking at the response headers at http://blog.folketsting.dk, it's evident that the content originates from Apache, not IIS. I'm pretty sure it's not a DNS-issue, since the problem is evident even when accessing the raw IP, eg. http://130.226.142.141/ vs. http://130.226.142.141/foo. I'm thinking it's a bad config in Apache... any clues?

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  • Apache randomly loses permission to see files.

    - by arbales
    I have a server (Leopard Server, not my choice) running Apache and MySQL. Several months ago, the server began to raise "Forbidden" errors at random intervals, preventing access to a PHP application. This behavior randomly ceased. Now, several days ago I installed Passenger and deployed a Sintra/Rack application. The application runs as a user acarneg (for example) from /Library/WebServer/Documents/presto/current/public, acarneg owns the entire structure. The _www user has access to the directory via ACL chmod +a "_www allow read,write,...". Everything works great! But after a randomish interval, often ~12 or ~24 hours, Passenger throws an error that also prevents the PHP application from running. Passenger Error #2. Cannot stat file config.ru. Permission denied. But the permissions haven't changed (confirmed) and all one has to do to resolve the error is sudo apachectl graceful. If the permissions aren't changing and Apache doesn't seem to have a legit problem, what is causing this mess? Why did it stop before, and why has it resumed!?!?!? Thanks for the help!

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  • Apache mod_auth_kerb asking 2 authentication

    - by Rianto Wahyudi
    I've configured Apache to use mod_auth_kerberos. So far everything is working nicely for client thats connected to Active Directory and have their browser to ntlm enabled. When clients are not in the domain or the browser configurerd not to authenticate automatically, they are being prompted by 2 login prompt. The first login prompt is blank and the second one is the oen that we configured First Login prompt: http://www.screencast.com/t/ZGNlZTQwZm Second Login prompt : http://www.screencast.com/t/MDA2N2Fl From the log ( first authentication) : [Wed Jan 06 15:47:29 2010] [debug] src/mod_auth_kerb.c(1684): [client x.x.x.x] [pid 2562] kerb_authenticate_user entered with user (NULL) and auth_type Kerberos In the first loging prompt , I can put any text for username and password. Once the first login form submited, it will ask for the 2nd login prompt. Apache have following config : <Directory /web/apache2/htdocs> AllowOverride All AuthType Kerberos AuthName "Staff Access ONLY Kerb-Auth" KrbAuthRealms EXAMPLE.COM Krb5Keytab /etc/httpd/conf.d/example.ktab Allow from localhost Require valid-user <Directory> What could be the cause of the first authentication and how can I get rid of them ?

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  • Apache wont start after attempting to install SSL

    - by yummm
    Below is what my VirtualHosts look like in httpd.conf <VirtualHost *:80> # Admin email, Server Name (domain name) and any aliases ServerAdmin [email protected] ServerName mydomain.com ServerAlias www.mydomain.com # Index file and Document Root (where the public files are located) DirectoryIndex index.php DocumentRoot /home/mydomain/public_html/mydomain.com/public # Custom log file locations LogLevel warn ErrorLog /home/mydomain/public_html/mydomain.com/log/error.log CustomLog /home/mydomain/public_html/mydomain.com/log/access.log combined </VirtualHost> <VirtualHost *:443> SSLEngine on SSLCertificateFile /etc/httpd/conf/ssl.crt/mydomain.com.crt SSLCertificateKeyFile /etc/httpd/conf/ssl.key/mydomain.com.key ServerName mydomain.com DirectoryIndex index.php DocumentRoot /home/mydomain/public_html/mydomain.com/public </VirtualHost> I'm using the latest version of Apache on CentOS and there isn't any error being generated. Apache just will not start. Any ideas what I'm doing wrong? UPDATE - Found these messages in the error log: [Tue Mar 16 02:07:57 2010] [error] Init: Private key not found [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218710120 error:0D094068:asn1 encoding routines:d2i_ASN1_SET:bad tag [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218529960 error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218595386 error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218734605 error:0D09A00D:asn1 encoding routines:d2i_PrivateKey:ASN1 lib

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  • Apache reverse proxy access control

    - by Steven
    I have an Apache reverse proxy that is currently reverse proxying for a few sites. However i am now going to be adding a new site (lets call it newsite.com) that should only be accessible by certain IP's. Is this doable using Apache as a reverse proxy? I use VirtualHosts for the sites that are being proxyied. I have tried using the Allow/Deny directives in combination with the Location statements. For example: <VirtualHost *:80> Servername newsite.com <Location http://newsite.com> Order Deny,Allow Deny from all Allow from x.x.x.x </Location> <IfModule rewrite_module> RewriteRule ^/$ http://newsite.internal.com [proxy] </IfModule> I have also tried configuring allow/deny specicaily for the site in the Proxy directives, for example <Proxy http://newsite.com/> Order deny,allow Deny from all Allow from x.x.x.x </Proxy> I still have this definition for the rest of the proxied sites however. <Proxy *> Order deny,allow Allow from all </Proxy> No matter what i do it seems to be accessible from any where. Is this because of the definition for all other proxied sites. Is there an order to which it applies Proxy directives. I have had the newsite one both before and after the * one, and also within the VirtualHost statement.

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