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• yum update with shared cache

  - by Sammitch

  We've got a big batch of RHEL6 machines that are due for patching, and for some reason the process here does not involve a local repo. I'm new here, I've asked why, ["it just didn't work"] and I don't have enough time to make it work before the window that's already scheduled. So the usual method is to install yum-downloadonly and run yum update --downloadonly --downloaddir=/mnt/cifs_share and then yum update /mnt/cifs_share/*.rpm which just does not look right to me since not all of these machines have the same set of installed packages. The method I tried today was mounting the share to /var/cache/yum/x86_64/6Server/rhel-x86_64-server-6/packages/ which worked, but then yum automatically deleted everything once it finished. I've looked over the yum man page, but I don't see any flag I can feed it to stop it from deleting everything, nor a flag like up2date's --tmpdir=/mnt/cifs_share. Can anyone out there help me kludge this together until I can get a local repository working?

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• Hardware specs for web cache

  - by Raj

  I am looking for recommendations for hardware specs for a server that needs to be a web cache for a user population of about 2,000 concurrent connections. The clients are viewing segmented HTTP video in bitrates ranging from 150kbps to 2mbps. Most video is "live" meaning segments of 2-10 secs each, of which 100 or so are maintained at a time. There are also some pre-recorded fixed length videos. How would I go about doing the provisioning calculation for such a server: What kind of HDD (SSD?), how many NICs how much RAM etc? I am thinking of using Varnish on Linux, all the RAM I can get my hands on, 2 CPUs with 6-8 cores each.

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• /manual/cache folder on my server?

  - by MrZombie

  Hi all, On our site's server, once managed by someone who's no longer with us, there's a folder named "/manual/cache" which contains txt files named+like+this, mostly using pornographic-related keywords. The content is mainly spam-like gibberish. My assumption on the matter is that it's somehow used to spam search engines, but I might be wrong, which is the reason of my question here. Any idea what it might mean/contain? As an additionnal note, the person's hiring period oddly correspond to the dates of the files, which seem to have automagically stopped being generated after the date we parted ways.

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• How to monitor nginx proxy cache?

  - by Isaac

  I would like to see which objects get cached by my nginx reverse proxy (with an apache as a backend). So far I could not find a way, only the info that its not implemented yet. The reason is that I would like to tweak my configuration for best performance without putting too much stress on the server, as the backend is a production system. I know benchmarking would be better, but its not an option right now. So I though an alternative measure would be to monitor the cache. Is that possible, and if yes, how? (despite patching nginx with the patch mentioned in the link above)

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• Cache that always returns immediate response?

  - by Col Wilson

  I have a web service that takes a while to build a response despite being tuned as best I can. What I'd like is some sort of cache sitting in front of the service which would always return the last known value from the service, but at the same time pass the request back to the service to build an up to date response for the next request. I'm aware of the limitations that this puts on the freshness of the data, but you can assume that I'm happy to live with that. The technologies I'm using at present are python uwsgi via nginx, but that need not be a limit to any solution you might suggest. Col

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• svn:externals cache and stale URLs

  - by dcaunt

  I have a subversion externals entry in a library folder which looks like this: Z https://svn/Z/trunk/library/Z Fetching external item into '/home/releases/50/library/Z' svn: OPTIONS of 'http://svn/repo/trunk/library/Z': could not connect to server (http://svn) The externals URL was the same, but over the HTTP protocol. Having changed the externals to point to the HTTPS, I can't figure out why subversion is still trying to use the old URL. Does subversion cache the externals path, and if so how can I clear this? If not, what else could be causing this? I can check out from the correct (HTTPS) URL fine from the server. NOTE: svn is an entry in the server's local hosts file, pointing to our subversion server's IP.

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• Errors Code: /var/cache/apt/archives/linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb

  - by user286682

  $ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages will be upgraded: linux-image-3.8.0-19-generic 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 6 not fully installed or removed. Need to get 0 B/47.8 MB of archives. After this operation, 142 MB of additional disk space will be used. Do you want to continue [Y/n]? y (Reading database ... 164064 files and directories currently installed.) Preparing to replace linux-image-3.8.0-19-generic 3.8.0-19.29 (using .../linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb) ... Done. Unpacking replacement linux-image-3.8.0-19-generic ... dpkg: error processing /var/cache/apt/archives/linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb (--unpack): trying to overwrite '/lib/modules/3.8.0-19-generic/kernel/arch/x86/kvm/kvm-intel.ko', which is also in package linux-image-extra-3.8.0-19-generic 3.8.0-19.29 dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.8.0-19-generic /boot/vmlinuz-3.8.0-19-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.8.0-19-generic /boot/vmlinuz-3.8.0-19-generic Errors were encountered while processing: /var/cache/apt/archives/linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) How can I get this update to work?

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• How does key-based caching work?

  - by Dominic Santos

  I recently read an article on the 37Signals blog and I'm left wondering how it is that they get the cache key. It's all well and good having a cache key that includes the object's timestamp (this means that when you update the object the cache will be invalidated); but how do you then use the cache key in a template without causing a DB hit for the very object that you are trying to fetch from the cache. Specifically, how does this affect One to Many relations where you are rendering a Post's Comments for example. Example in Django: {% for comment in post.comments.all %} {% cache comment.pk comment.modified %} <p>{{ post.body }}</p> {% endcache %} {% endfor %} Is caching in Rails different to just requests to memcached for example (I know that they convert your cache key to something different). Do they also cache the cache key?

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• Is this an apt-get issue or network issue?

  - by zharvey

  I just installed my first Ubuntu server (12.04) instance and immediately am noticing a few things: Running apt-get install or update fails (see below) Running ifconfig produces peculiar IP addresses starting with 10.x.x.x and my router does not see the server at all in its "Attached Devices" page (its a consumer grade Netgear) When I run apt-get I get 50+ of the following errors: Failed to fetch <some-http-url. Temporary failure resolving <blah.ubuntu.com I read up on this error for 12.04, and found some similar posts on this forum and on serverfault that recommended going into /etc/resolv.conf and adding an entry: nameserver 8.8.8.8 To my surprise, I found that /etc/resolve.conf was a symlink pointing to somewhere else and I had to delete it first, then create a new one with the entry indicated above. I restarted the server and tried running apt-get again: same results. How do I start diagnosing the problem (I'm a relatively new Linux/Ubuntu user)? Additional details that may help: This is actually a virtual machine running as a VirtualBox guest OS The physical host that is running this VM is my laptop which has a wireless connection; I'm wondering if (somehow) the laptop is getting the network wirelessly, but perhaps either the VBox VM and/or the Ubuntu server OS isn't configured for wireless and so nothing is "getting through"? Thanks in advance for any pointers! Edit: Here is a snapshot of my VM's Network settings (only Adapter 1 has any information populating its fields, so I assume my VM has only 1 adapter): Here is the output when I run ifconfig from the terminal: And here is the output when I run route from the terminal: Running ping google.com:

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• Login screen appears even if logged in

  - by Prasenjit

  HEHE it's a stupid problem, for those who care place the following on the load event of the master page or default             Response.AppendHeader("Cache-Control", "no-cache"); //HTTP 1.1             Response.AppendHeader("Cache-Control", "private"); // HTTP 1.1             Response.AppendHeader("Cache-Control", "no-store"); // HTTP 1.1             Response.AppendHeader("Cache-Control", "must-revalidate"); // HTTP 1.1             Response.AppendHeader("Cache-Control", "max-stale=0"); // HTTP 1.1              Response.AppendHeader("Cache-Control", "post-check=0"); // HTTP 1.1              Response.AppendHeader("Cache-Control", "pre-check=0"); // HTTP 1.1              Response.AppendHeader("Pragma", "no-cache"); // HTTP 1.1              Response.AppendHeader("Keep-Alive", "timeout=3, max=993"); // HTTP 1.1              Response.AppendHeader("Expires", "Mon, 26 Jul 1997 05:00:00 GMT"); // HTTP 1.1   It finally worked for me:)

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• Building "isolated" and "automatically updated" caches (java.util.List) in Java.

  - by Aidos

  Hi Guys, I am trying to write a framework which contains a lot of short-lived caches created from a long-living cache. These short-lived caches need to be able to return their entier contents, which is a clone from the original long-living cache. Effectively what I am trying to build is a level of transaction isolation for the short-lived caches. The user should be able to modify the contents of the short-lived cache, but changes to the long-living cache should not be propogated through (there is also a case where the changes should be pushed through, depending on the Cache type). I will do my best to try and explain: master-cache contains: [A,B,C,D,E,F] temporary-cache created with state [A,B,C,D,E,F] 1) temporary-cache adds item G: [A,B,C,D,E,F] 2) temporary-cache removes item B: [A,C,D,E,F] master-cache contains: [A,B,C,D,E,F] 3) master-cache adds items [X,Y,Z]: [A,B,C,D,E,F,X,Y,Z] temporary-cache contains: [A,C,D,E,F] Things get even harder when the values in the items can change and shouldn't always be updated (so I can't even share the underlying object instances, I need to use clones). I have implemented the simple approach of just creating a new instance of the List using the standard Collection constructor on ArrayList, however when you get out to about 200,000 items the system just runs out of memory. I know the value of 200,000 is excessive to iterate, but I am trying to stress my code a bit. I had thought that it might be able to somehow "proxy" the list, so the temporary-cache uses the master-cache, and stores all of it's changes (effectively a Memento for the change), however that quickly becomes a nightmare when you want to iterate the temporary-cache, or retrieve an item at a specific index. Also given that I want some modifications to the contents of the list to come through (depending on the type of the temporary-cache, whether it is "auto-update" or not) and I get completly out of my depth. Any pointers to techniques or data-structures or just general concepts to try and research will be greatly appreciated. Cheers, Aidos

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• Need help profiling .NET caching extension method.

  - by rockinthesixstring

  I've got the following extension Public Module CacheExtensions Sub New() End Sub Private sync As New Object() Public Const DefaultCacheExpiration As Integer = 1200 ''# 20 minutes <Extension()> Public Function GetOrStore(Of T)(ByVal cache As Cache, ByVal key As String, ByVal generator As Func(Of T)) As T Return cache.GetOrStore(key, If(generator IsNot Nothing, generator(), Nothing), DefaultCacheExpiration) End Function <Extension()> Public Function GetOrStore(Of T)(ByVal cache As Cache, ByVal key As String, ByVal generator As Func(Of T), ByVal expireInSeconds As Double) As T Return cache.GetOrStore(key, If(generator IsNot Nothing, generator(), Nothing), expireInSeconds) End Function <Extension()> Public Function GetOrStore(Of T)(ByVal cache As Cache, ByVal key As String, ByVal obj As T) As T Return cache.GetOrStore(key, obj, DefaultCacheExpiration) End Function <Extension()> Public Function GetOrStore(Of T)(ByVal cache As Cache, ByVal key As String, ByVal obj As T, ByVal expireInSeconds As Double) As T Dim result = cache(key) If result Is Nothing Then SyncLock sync If result Is Nothing Then result = If(obj IsNot Nothing, obj, Nothing) cache.Insert(key, result, Nothing, DateTime.Now.AddSeconds(expireInSeconds), cache.NoSlidingExpiration) End If End SyncLock End If Return DirectCast(result, T) End Function End Module From here, I'm using the extension is a TagService to get a list of tags Public Function GetTagNames() As List(Of String) Implements Domain.ITagService.GetTags ''# We're not using a dynamic Cache key because the list of TagNames ''# will persist across all users in all regions. Return HttpRuntime.Cache.GetOrStore(Of List(Of String))("TagNamesOnly", Function() _TagRepository.Read().Select(Function(t) t.Name).OrderBy(Function(t) t).ToList()) End Function All of this is pretty much straight forward except when I put a breakpoint on _TagRepository.Read(). The problem is that it is getting called on every request, when I thought that it is only to be called when Result Is Nothing Am I missing something here?

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• I cant get rid of apache2

  - by DaNieL

  It's obvious that I am a newbie with server amministration, my goal is to reach the knowledge needed to working with web services. I played with my debian server, and i messed up apache2; Now i want to completely* remove it from the server and then reinstall it as new. *for completely i really mean completely, logs, configurations, settings, everythings! I followed the steps suggested by freedom_is_chaos in this answer, and i guess apache2 is nomore installed, becose if i do apt-get remove apache2 i get this: Reading package lists... Done Building dependency tree Reading state information... Done Package apache2 is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded. Then, i rebooted the server, and: # netstat -plant Active Internet connections (servers and established) [...] tcp6 0 0 :::80 :::* LISTEN 3467/apache2 [...] WTF? is apache2 still here? So seem: # /etc/init.d/apache2 stop Stopping web server: apache2. But: # update-rc.d remove apache2 update-rc.d: /etc/init.d/remove: file does not exist So, what is happening to my server? How can i completely and truly remove apache2 from my server?

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• Ubuntu: package installed, but files missing?

  - by jeckyll2hide

  I have been playing around with the /etc/asterisk directory, installing the related pacakge (asterisk-config), removing it, removing the directory manually (just playing around to get the configuration synced to my configuration repo). Now I just want to reinstall the official package, so I do: root@tethys:/etc# apt-get install asterisk-config root@tethys:/etc# tree asterisk/ asterisk/ +-- manager.d What?! Empty?!? Have I installed it? root@tethys:/etc# dpkg --get-selections | grep asterisk asterisk install asterisk-config install asterisk-core-sounds-en install asterisk-core-sounds-en-gsm install asterisk-modules install asterisk-moh-opsound-gsm install asterisk-voicemail install Indeed! Let me check the contents of the package: root@tethys:/etc# dpkg -L asterisk-config ... /etc /etc/asterisk /etc/asterisk/res_snmp.conf /etc/asterisk/dbsep.conf /etc/asterisk/cel_custom.conf /etc/asterisk/cel.conf /etc/asterisk/meetme.conf /etc/asterisk/jingle.conf /etc/asterisk/queuerules.conf ... So, what have I done that the package will get installed, but the contents are nowhere to be seen? And, more importantly, how can I force the contents to be installed, no matter what I have done before?

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• How do I install the latest version of packages in Ubuntu?

  - by Roman

  For example I want to install the latest version of "numpy". I type the following: "sudo apt-get install python-numpy". When I type this the first time it installs something and if I type this the second time it writes that I have already the latest version of numpy. However, I see that my version of numpy is 1.1.1. and I know that it NOT the latest version. Why it happens and how this problem can be solved? I can find the *tar.gz file with the latest version, I can extract files with the archive and than I need to rune one of the scripts which will be somewhere among the extracted files. But I do not like this way. It is too complicated. I do not know where I should put all these files, I do not know which dependencies I should install before I run the script for the installation of numpy, I do not know where numpy will be put after installation and so on. Is there an easy way to get the latest version of numpy?

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• Azure's Ubuntu 12.0.4 fails to install PHP5

  - by Alex Kennberg

  Similar to this article from Azure themselves: http://www.windowsazure.com/en-us/manage/linux/common-tasks/install-lamp-stack/ I am trying to install PHP5 on Ubuntu 12.0.4 virtual machine. However, it fails installing the ssl-cert. $ sudo apt-get install php5 Reading package lists... Done Building dependency tree Reading state information... Done php5 is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 49 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? y Setting up ssl-cert (1.0.28) ... Could not create certificate. Openssl output was: Generating a 2048 bit RSA private key ............................+++ ...................................................................................................................+++ writing new private key to '/etc/ssl/private/ssl-cert-snakeoil.key' ----- problems making Certificate Request 140320238503584:error:0D07A097:asn1 encoding routines:ASN1_mbstring_ncopy:string too long:a_mbstr.c:154:maxsize=64 dpkg: error processing ssl-cert (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: ssl-cert E: Sub-process /usr/bin/dpkg returned an error code (1) Any tips appreciated.

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• Cannot install mercurial properly - PYTHONPATH error

  - by evident

  Hi, I have a server running on Ubuntu 10.04 on which I wanted to install Mercurial via % sudo apt-get install mercurial It seems to have installed successfully and doesn't show me any error messages. But when I try it I get: % hg abort: couldn't find mercurial libraries in [/usr/bin /usr/lib/python2.6 /usr/lib/python2.6/plat-linux2 /usr/lib/python2.6/lib-tk /usr/lib/python2.6/lib-old /usr/lib/python2.6/lib-dynload /usr/lib/python2.6/dist-packages /usr/lib/pymodules/python2.6 /usr/local/lib/python2.6/dist-packages] (check your install and PYTHONPATH) I've googled for a while now and found some sites with the same problem but I still have no idea on how to fix it since it nowhere really says what I need to look for or what I need to add to my PYTHONPATH... By the way, right now my PYTHONPATH seems to be empty: % echo $PYTHONPATH % This is what I get if I look into my /usr/lib/ directory for mercurial: % find /usr/lib/py* -name 'mercurial*' /usr/lib/pymodules/python2.6/mercurial /usr/lib/pymodules/python2.6/mercurial-1.4.3.egg-info /usr/lib/pyshared/python2.6/mercurial Can anybody please help me with that? What (and how) should I set my PYTHONPATH to? I already tried reinstalling, installing with "easy_install mercurial" or with "aptitude reinstall mercurial" but nothing helped. I always get this same error. Would be great if anyone could help... thanks! ADDITION: Building from scratch didn't work out well... when I am logged in as root I can use hg, but when I access with my normal user I get: % hg Traceback (most recent call last): File "/usr/local/bin/hg", line 4, in <module> import pkg_resources File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 2659, in <module> parse_requirements(__requires__), Environment() File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 546, in resolve raise DistributionNotFound(req) pkg_resources.DistributionNotFound: mercurial==1.7.2

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• Dependencies problems installing openjdk on Ubuntu

  - by Rodnower

  I try to install openjdk-7-jre: sudo apt-get install openjdk-7-jre But I have dependencies problems: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: openjdk-7-jre : Depends: openjdk-7-jre-headless (= 7u7-2.3.2a-0ubuntu0.12.04.1) but it is not going to be installed Depends: libgif4 (>= 4.1.4) but it is not installable Depends: libatk-wrapper-java-jni (>= 0.30.4-0ubuntu2) but it is not installable Recommends: libgnome2-0 but it is not installable Recommends: libgnomevfs2-0 but it is not going to be installed Recommends: ttf-dejavu-extra but it is not installable E: Unable to correct problems, you have held broken packages. This is version of Ubuntu: Ubuntu 12.04.1 LTS I completely don't know how resolve dependencies... Some one can help me? Thank you for ahead.

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• php5-gd shows in "php -i | grep -i gd" but not in phpinfo();

  - by Qzen

  I am trying to enable GD in my installation of Apache2, PHP5 and MySQL on my Ubuntu server. I installed php5-gd with: apt-get install php5-gd And when I run php -i I get: gd GD Support => enabled GD Version => 2.0 FreeType Support => enabled FreeType Linkage => with freetype FreeType Version => 2.4.8 T1Lib Support => enabled GIF Read Support => enabled GIF Create Support => enabled JPEG Support => enabled libJPEG Version => unknown PNG Support => enabled libPNG Version => 1.2.46 WBMP Support => enabled Directive => Local Value => Master Value gd.jpeg_ignore_warning => 0 => 0 But it does not show up in phpinfo(); I have restarted the server four times and I have tried to restart Apache2 four million times. Does anyone have any idea of how to fix this problem?

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• Debian Wheezy 7.5 64bit xfce4 install error ( no desktop environment installed already )

  - by GeoMind

  i wrote a CD with an iso-image from debian.org. the debian-7.5.0-amd64-CD-1.iso from this folder. Debian Wheezy 7.5 stable 64bit There was an error at Select and install software step. It said Retrieving file 770 from 800 and then it failed the installation. I continued the instal and when i opened the computer it doesn't work the Ctrl + Alt + F7 as i waited. It starts at tty1 and after logging in i edited config file cause it had a lot of errors and said E: Unable to correct problems, you have held broken packages or Couldn't found the package. FILE: /etc/apt/sources.list # deb cdrom:[Debian GNU/Linux 7.5.0 _Wheezy_ - Official amd64 CD Binary-1 20140426-13:37]/ wheezy main #deb cdrom:[Debian GNU/Linux 7.5.0 _Wheezy_ - Official amd64 CD Binary-1 20140426-13:37]/ wheezy main deb http://security.debian.org/ wheezy/updates main contrib non-free deb-src http://security.debian.org/ wheezy/updates main contrib non-free deb http://ftp.us.debian.org/debian/ squeeze main contrib non-free deb-src http://ftp.us.debian.org/debian/ squeeze main contrib non-free After that i tried to install xfce4 as desktop environment. Guide found at Linux Panda But it print at terminal: What i sould do? How i can fix this problem?

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• package manager cannot create users? installation script fails?

  - by RapidWebs

  It seems that when trying to install any package which requires the creation of a system User and Group, the installer fails with the error: install: invalid user 'username' When it happened the first time, I assumed it was related to the package, or it's installation script. But now I am attempting a different package, and alas, the same issue arises! note: /etc/passwd and /etc/group is not chattr -i Here is the example output from an attempted installation (of varnish): Selecting previously unselected package varnish. Unpacking varnish (from .../varnish_3.0.2-1ubuntu0.1_amd64.deb) ... Processing triggers for man-db ... Setting up libvarnishapi1 (3.0.2-1ubuntu0.1) ... Setting up varnish (3.0.2-1ubuntu0.1) ... install: invalid user `varnish' dpkg: error processing varnish (--configure): subprocess installed post-installation script returned error exit status 1 Processing triggers for libc-bin ... ldconfig deferred processing now taking place Errors were encountered while processing: varnish note: running ubuntu 12.04 For now, I have resolved the issue by manually creating the users, and running apt-get install -f, but this does not resolve the actual issue. Any ideas?

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• Should I update the kernel on a Linux machine?

  - by Legate

  As I understand it, updating to a new kernel (with the normal linux-image... package, not by rolling my own) requires a server restart. However, one of our servers (Ubuntu 10.04) is running several extensive screen sessions. Restarting kills those which is always a major hassle to their owners (mostly because of lost session histories). What should I do? I see several possibilites: Not doing anything, that is update only non-kernel packages (perhaps use apt-pinning?) Update the kernel, but not restart. (Is that smart? I seem to remember there might be some problems with loading kernel modules.) Updating the kernel and restarting. Is there perhaps some way to preserve the screen sessions? I guess it ultimately boils down to this question: How important is it to update the kernel? I posted this question here instead of askubuntu.com as I think this is not an Ubuntu-specific issue though this server is running Ubuntu.

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• Why does using ASP.NET OutputCache keep returning a 200 OK, not a 304 Not Modified?

  - by Pure.Krome

  Hi folks, i have a simple aspx page. Here's the top of it:- <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Foo.aspx.cs" Inherits="Foo" %> <%@ OutputCache Duration="3600" VaryByParam="none" Location="Any" %> Now, every time I hit the page in FireFox (either hit F5 or hit enter in the url bar) I keep getting a 200 OK response. Here's a sample reply from FireBug :- Request Headers:- GET /sitemap.xml HTTP/1.1 Host: localhost.foo.com.au User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2) Gecko/20100115 Firefox/3.6 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-au,en-gb;q=0.7,en;q=0.3 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Cookie: <snipped> If-Modified-Since: Tue, 01 Jun 2010 07:35:17 GMT If-None-Match: "" Cache-Control: max-age=0 Response Headers:- HTTP/1.1 200 OK Cache-Control: public Content-Type: text/xml; charset=utf-8 Expires: Tue, 01 Jun 2010 08:35:17 GMT Last-Modified: Tue, 01 Jun 2010 07:35:17 GMT Etag: "" Server: Microsoft-IIS/7.5 X-Powered-By: UrlRewriter.NET 2.0.0 X-AspNet-Version: 4.0.30319 Date: Tue, 01 Jun 2010 07:35:20 GMT Content-Length: 775 Firebug Cache tab:- Last Modified Tue Jun 01 2010 17:35:20 GMT+1000 (AUS Eastern Standard Time) Last Fetched Tue Jun 01 2010 17:35:20 GMT+1000 (AUS Eastern Standard Time) Expires Tue Jun 01 2010 18:35:17 GMT+1000 (AUS Eastern Standard Time) Data Size 775 Fetch Count 105 Device disk Now, if i try it in Fiddler using the Request Builder (and no extra data) I also keep getting the same 200 OK reply. Request Headers:- GET http://localhost.foo.com.au/sitemap.xml HTTP/1.1 User-Agent: Fiddler Host: foo.com.au Response Headers:- HTTP/1.1 200 OK Cache-Control: public Content-Type: text/xml; charset=utf-8 Expires: Tue, 01 Jun 2010 07:58:00 GMT Last-Modified: Tue, 01 Jun 2010 06:58:00 GMT ETag: "" Server: Microsoft-IIS/7.5 X-Powered-By: UrlRewriter.NET 2.0.0 X-AspNet-Version: 4.0.30319 Date: Tue, 01 Jun 2010 06:59:16 GMT Content-Length: 775 It looks like it's asking to cache it but it's not :( Server is a localhost IIS7.5 on Win7. (as listed in the Response data). Can anyone see what I'm doing wrong?

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• Impact of the L3 cache on performance - worth a dual-processor system?

  - by Dan Nissenbaum

  I will be purchasing a new high-end system, and I would like to have a better sense of whether a dual-processor Xeon system (I am looking at the new, high-end Xeon E5-2687W) might, realistically, provide a noticeable performance improvement due to the doubling of the L3 cache (20 MB per CPU). (This is in addition to the occasional added advantage due to the doubling of cores and RAM.) My usage scenario is, roughly, that I have many background applications running at any time - 3 or 4 data compression/backup applications, a low-impact web server, one or two virtual machines at any given time (usually fairly idle), and perhaps 20 utility programs that utilize a noticeable (but small) portion of the CPU cores. In total, when I am not actively using the computer, about 25% of the total CPU power is utilized in my current i7-970 6-core (12 thread) system. When I am doing routine work, the CPU utilization often exceeds 50%, and occasionally hits 75%-80%. The Xeon E5-2687W is not only a second-generation i7 (so should improve performance for that reason), but also has 8 cores (16 threads), rather than 6 cores. For this reason, I expect to run into the 75% CPU range even less frequently. Nonetheless, the ability to double the cores and the RAM is a consideration. However, in the end, I believe this decision comes down to whether the doubling of the L3 cache will provide a noticeable improvement. There are many benchmarks, and a lot of discussion, regarding CPU power. However, I find very little discussion of L3 cache utilization, and how increases in the L3 cache (such as doubling it with dual processors) affect performance. For example: If there are only two processes running, but each benefits from a large L3 cache (such as might be the case for background processes that frequently scan the file system), perhaps the overall system performance might noticeably improve with dual CPU's - even if only a single core is active on each CPU - due to each process having double the effective L3 cache. I am hoping that someone has a sense of the benefits of increasing (or doubling) the L3 cache size. Note: the CPU I am considering (the Xeon E5-2687W) has 20 MB L3 cache, so a system with dual CPU's would have 40 MB L3 cache.

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• Why are some web clients requesting a page named "cache"?

  - by Toto

  We see errors like this in the apache error log: [Thu May 17 14:32:35 2012] [error] [client 192.168.1.1] File does not exist: /home/www-data/mywebsite.com/r/cache, referer: http://www.mywebsite.com/r/1010 It is strange because: There is no reference in the code/url about a folder/file "cache". The folder/file "cache" does not exist The client is randomly trying to access a "cache" folder everywhere on the website. It is always trying to access the folder/file "cache" following this pattern: Pattern: /level1/.../levelwhatever/filename (referer) /level1/.../levelwhatever/cache We run a LAMP (Debian stable: PHP 5.3.3-7+squeeze9. We also use APC 3.1.3p1). We use Google Analytics and AdSense. We do not know how to reproduce the problem. Note: I replaced the user's IP in the code for privacy.

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