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• Mono on Linux: Apache or Nginx

  - by Furism

  Hi, I'm developing an ASP.NET application that will be run under Linux/Mono for various reasons (mostly to stay away from IIS, quite frankly). Of course the first web server I had in mind was Apache. But Apache, for all its advantages, adds a lot of overhead. Also, the application I'm building needs to be highly scalable and performance is one of the main concern. Apache has, obviously, a very good reputation and its record speaks for itself, but I don't need things like Reverse Proxy or Load Balancing because dedicated network devices would be used for that. So those modules from Apache will never be used. So basically my question is: since Nginx seems to fit exactly needs, is there any caveat I should be aware of? For instance, is Nginx renowned to be particularity safe? When security flaws are detected, how fast are they patched? Any insight on the pros and cons of using either of those servers in conjunction with Mono is welcome.

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• MaxClients in apache. How to know the size of my proccess?

  - by Larry

  From http://httpd.apache.org/docs/2.2/misc/perf-tuning.html The single biggest hardware issue affecting webserver performance is RAM. A webserver should never ever have to swap, as swapping increases the latency of each request beyond a point that users consider "fast enough". This causes users to hit stop and reload, further increasing the load. You can, and should, control the MaxClients setting so that your server does not spawn so many children it starts swapping. This procedure for doing this is simple: determine the size of your average Apache process, by looking at your process list via a tool such as top, and divide this into your total available memory, leaving some room for other processes. The main issue is that I can't understand how to know the size, because, well i have the size of httpd on no more of 3888 But, if we need to determine the number for MaxClients, and I have 4GB of RAM, so I get: 972, so I should use like 900 in the MaxClients?

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• nginx regex characters that require quoting?

  - by Michael Louis Thaler

  So I was configuring nginx today and I hit a weird problem. I was trying to match a location like this: location ~ ^/([0-9]+)/(.*) { # do proxy redirects } ...for URLs like "http://my.domain.com/0001/index.html". This rule was never matching, despite the fact that it by all rights should. It took me awhile to figure out, based on this documentation, that some characters in regexes need to be quoted. The problem is, the documentation is for rewrites, and it specifically calls out curly braces, not square brackets. After a fair bit of experimentation that involved a lot of swearing, I discovered that I could fix the problem by quoting the regex like so: location ~ "^/([0-9]+)/(.*)" { # do proxy redirects } Is there a list somewhere of characters that nginx requires quoting regexes with? Or could there be something else going on here that I'm totally missing? This is my first nginx configuration job, so it's very possible I've misunderstood something...

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• Samsung 830 very slow benchmark numbers

  - by alekop

  I just bought a new SSD, and installed a fresh copy of Windows on it. I didn't see any noticeable difference in boot times, app start-up times, so I decided to benchmark it. Asus P7P55D-E Intel i5-760 Samsung 830 256GB SATA III Windows 7 Ultimate 64-bit The Windows experience index gave the drive a 7.3 rating, but real-world performance is not particularly impressive. Any ideas why the numbers are so low? UPDATE: It turns out that SATA III support is turned off by default on the P7P55D motherboard. After enabling it in BIOS (Tools - Level Up), the scores went up: Read Write Seq 325 183 4K 16 49 IOPS 32K 28K It's an improvement, but still far below what they should be for this drive.

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• How to enter into BusyBox when booting?

  - by ???

  I have occasionally installed cloud-init package in Ubuntu, which blocks me from booting. Neither recovery mode works. Because cloud-init installed some upstart job configuration. So I want to enter into busybox to remove /etc/init/cloud-init*.conf, but it seems like no way to do it. I can press Ctrl+Alt+SysRq which brings on a rough hack menu, but there is no busybox option. So is it possible? My CDROM is broken so I can't use Live CD too.

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• Windows pysical server provisioning question with HPSA 7.8

  - by warren

  I have a physical server that I am trying to provision Windows to. At 58% of the way through copying files form the Core to the target server, the process hangs with either a samba time-out or an error indicating that %path%\system32\ntoskrnl.exe is missing or corrupt. I can build a VM on the same subnet with the same media (merely a different profile to catch the different unattend.txt file) with no issues. I can also provision RHEL5 to this server with no issues. The buildmgr logs indicate that eventually the job is timing-out. Samba logs show that connections are made, and then eventually closed - about the time that the build process times-out. Any ideas on where to look next?

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• Instant database snapshot

  - by raj

  My product uses oracle 9 database in its backend. every week the new release of the product is launched which will want to fire some DML, DDL queries to the database. I usually test the product release in a dummy database before applying it in the main database. I create a database dump using exp command, then import them into dummy database using imp. then i test the product in the dummy database and checks if there are any errors. This exp and imp takes about 3 hours to complete. Is there any alternative as : instant snapshot of the live database (which will be independent of the live one)? or is there any option to keep dummydatabase in sync with the originl database always. Yhis can be done by making the product firing DML&DDL queries to both the databases.. but this will be a HUGE performance problem.. how can i overcome this?

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• Fixing Corrupted Text

  - by oort

  I Have text which looks like this: supposed to undergo yearly cardiac exam in order to stay on transplant list. But, there are patients who are missing important cardiac information. It is yo ur job as an intern on call to make sure that you fin As you can see, the first line is fine, but then the second line is corrupt. It looks like this even when I open it using Vim or LibreOffice. Is there a way to fix this? I've tried changing the encoding to UTF-8 but to no avail. Thanks!

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• Monitoring outgoing bandwidth of application

  - by jnolte

  I currently have a VPS that is consuming a ton of outgoing bandwidth and I am trying to drill down to where this may be coming from. Does anyone know of a logical way to go about finding out which pages on the site are consuming the most outgoing data. We have done a ton of front-end optimizations to the site and our google page speed rankings ar 85% so I feel we have done a pretty great job at optimizing the site for speed. Can someone lend some insight on how they have made similar optimizations? Application / Server Stack LEMP Running Varnish Cache / PHP5-FPM WordPress running w3 Total Cache Ubuntu 12.04 LTS

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• Sar data not collected for 10 minutes

  - by Ichorus

  We have a RedHat server whose only job is to run a JBoss server. Monitors said that memory usage spiked (we have the JVM limited to far less than the total memory on the system) and JBoss crashed. We restarted and everything seems ok now. Odd thing is that sar data for 10 min leading up to the crash is simply not there. Load average got up to the 50s. I have seen severely busy systems (350+ Load Average) still collect sar data. Does anyone have any idea what could cause sar to stop collecting data?

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• 1 domain.. 2 server and 2 applications

  - by basit.

  i have a site like twitter.com on server one and on server two i have forum, which path is like domain.com/forum on server one i wanted to implement wild card dns and put main domain on it. but on server two i wanted to keep forum separate, i cant give sub-domain forum.domain.com, because all its links are already put in search engines and link back to domain.com/forum. so i was wondering, how can i put domain and wild card dns on server one and still able to give path on server 2 for domain.com/forum (as sub-folder). any ideas? do you think htaccess can do that job? if yes, then how?

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• How does ARM Cortex A8 compare with a modern x86 processor

  - by thomasrutter

  I was wondering how does a modern ARM chip based on ARM Cortex A8 compare, in clock-for-clock performance and capability, to a modern x86 chip such as a Core 2 Duo or Core i5? I realise due to the different instruction sets it'll depend heavily on what you're doing. To put it another way, rendering a web page in webkit on a 1GHz ARM Cortex A8 based chip should be about equivalent to doing in on a Core i5 at __ MHz? Update October 2013: Since I asked this question years ago it's become a lot more common, when reading about mobile devices, to see architecture-agnostic benchmarks that you can compare across platforms - for example, in-browser benchmarks like Sunspider in Webkit will run on just about anything and you see these in reviews all the time now. And there's things like Geekbench now.

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• How to unmount a VHD in Windows 7. There is no unmount option.

  - by Triynko

  I mounted a VHD file in Windows 7 using the Disk Manager. Once mounted, there is no option to Unmount it. The only thing close to such an option that I can find is if I click the icon in the taskbar notification area that I use to remove USB devices... there's an option to eject the virtual hard disk. However, when I click that, it says that it's in use and cannot be ejected. Even though... it's not in use, I never even browsed the drive. The disk manager is closed... and the only open files handles to the drive (according to disk performance in task manager) is SYSTEM. Ejecting devices cleanly has been a problem since Windows XP, and it sickens me to see it persist into windows 7.

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• Mapping drives on MacOSX (Leopard/Snow Leopard) permanently inside LAN

  - by Shyam

  Hi, How do I "map" shared folders on a Mac, permanently? With map, I do not mean 'connect', but permanently add it to the system so it exists after reboot. Since workstations tend to shutdown, I wonder also the symptoms and cures in case that happens. In Linux, this can be done using the fstab file, but I noticed that volumes are mounted in a different structure than Linux. I need this to backup some workstations, doing a recursive job over a single directory, that should contain the shared folders. I use Terminal to access the main system, so by preference, the solution would be nice that works within a bash shell vs GUI. I can access all folders in Finder. Thanks!

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• Hyper-V core NIC speeds and registry changes

  - by gary

  Good afternoon, On a Dell PE T610 I have Hyper-V core running, with 2 x Broadcom BCM5709C NetXtreme II GigE installed. I have noticed that copying large files 17GB for example, from a network physical server to the Hyper-V host local drive [not vm guest] is very slow in comparison to copying from Physical to Physical servers. Copying a 17GB file physical to Hyper-V host takes 30 minutes Copying a 17GB file physical to physical host takes 15 minutes Can someone tell me exactly what registry nodes I should disable on Hyper-V NICs to improve performance. So far I have gone to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4 D36E972-E325-11CE-BFC1-08002BE10318} and set the following to 0 on both physical NICs: *LSOv1IPv4 *LSOv2IPv6 *TCPUDPChecksumOffloadIPv4 *TCPUDPChecksumOffloadIPv6 Should I also disable *TCPConnectionOffloadIPv4 & *TCPConnectionOffloadIPv6? Many thanks in advance

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• Error installing Arch Linux

  - by Garethj94

  So, I am trying to install Arch Linux on my Acer Aspire 4830tg, but I keep running into problems. Some background knowledge, I am trying to install Arch off a usb stick and I got the iso image using bittorrent. I am also trying to install it alongside of Windows 8 (which is already installed). So when I boot into Arch linux I get this error: :: Mounting '/dev/disk/by-label/ARCH_201212' to 'run/archiso/bootmnt' Waiting 30 seconds for device /dev/disk/by-label/ARCH_201212 ... ERROR: '/dev/disk/by-label/ARCH_201212' device did not show up after 30 seconds... Falling back to interactive prompt You can try to fix the problem manually, log out when you are finished sh: can't access tty; job control turned off I know that it will work if I run it on a virtual machine but whenever I try to install it on my laptop I keep getting this error. And since you can't register for the Arch forums without a Arch terminal to run their captcha command I can't ask this on their forums.

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• How to back up server with rsync, preserving ownership/permissions without root login

  - by olilarkin

  I am setting up a backup server on which I want to run rsync over ssh to backup content on other servers every night. I would like to set up ssh keys to make it password-less, but I want to preserve ownership of files and permissions. There are a number of users on the server to be backed up which won't all exist on the backup server. What would be the best way to do this? I guess the backup job will need to connect as root to , but I don't want to enable root ssh access on the servers. thanks for any tips, oli ps, all servers are running UBUNTU Server 12.04 LTS and are behind a university firewall.

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• HP Printer scrolls "printing" forever - but nothing happens

  - by brett80

  I got a used HP Officejet 7130 all-in-one printer. I tried printing a text document, and it shows up in the queue (and says "printing"), and the printer display says "Printing" "Press Cancel to cancel job." - and it cyles that text forever, but nothing ever happens (after a couple of initial quiet noises.) I tried to print a test page from the printer, and I get the same "printing" message. I checked the hp website, and this problem is not on their list. (They are expecting a queue problem, error message, etc.) I did initially get a message that it needs new ink cartridges, but I pressed to get past that. It's supposed to try to print anyway. I don't want to buy ink cartridges for a printer that is broken. When I press it cancels correctly.

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• Limiting Sybase ASE 15 CPU usage on VM

  - by reiniero

  I've set up a single CPU Sybase ASE 15.7 test/hobby/experimentation system on a Debian Squeeze x64 KVM VM. I notice the CPU load goes to 100% and stays there. Definitely not a Sybase guru, only interested to see if some programs I'm running work on the database. Looking at Sybase docs it seems ASE detects the machine is idle and then takes over all processing just waiting for a connection (and if needed, doing some housekeeping apparently). Normally that would be fine but as it is running in a VM it's taking away processor resources other VMs could use - and the increased fan noise of the PC near my desk annoy me. I've tried to remedy this: set the "runnable process search count" parameter from DEFAULT (2000 IRC) to 3 in /opt/sybase/ASE-15_0/SYBASE.cfg from http://sybase.reygrobellet.com/tutorials/install_sybase_vb/standalone04_configure_oralin11#TOC-Configure-kernel I added this to my /etc/init.d/sybase startup script: echo 0 /proc/sys/kernel/randomize_va_space (though I don't think it'll make much difference) How can I tell Sybase to "behave" and not hog the processor - I don't mind reduced performance.

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• How can I rip a DVD but merge/join episodes

  - by Nifle

  Some background. I have the Pink Panther Collection, they have about 30 episodes on each DVD. Now I want to watch this on my $MobileDevice. So I went and converted it to m4v or avi. This of course went splendid with both Handbrake and AutoGK but the problem is that I want ONE file per DVD, both Handbrake and AutoGK creates one file per episode. So here finally is my question. Does anyone know how to persuade Handbrake or AutoGK to create one video file with all the episodes? Or can anyone recommend another (free/cheep) tool for the job? Oh and no cheating by telling me to join the files after conversion. I have never found a video joiner that did not disappoint me (usually bad audio sync).

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• Can Acrobat 11 be made to do OCR using multiple CPU cores?

  - by tarcman.

  OCR processing takes time. Using multiple CPU cores would speed up processing. Acrobat 10 was not a multithreaded application. How about Acrobat 11? Does 11 by default do OCR using multiple CPU cores (if available)? If not, are there any workarounds, e.g. scripting, to help make Acrobat 11 do OCR using multiple CPU cores? Either through Acrobat's built in scripting language or using external scripts that launch and direct multiple single thread instances of Acrobat to in parallell to parts of the processing job. Note: This question is not too localized (not limited to a specific moment in time) because (1) Adobe does not release new major Acrobat versions very often (Acrobat 10 was released two years ago) and (2) Adobe Acrobat is a widely used application.

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• Getting rid of site-specific hotkeys

  - by ZyX

  How do I disable site-specific hotkeys if (and only if) they are already mapped in Opera? For example, I use <C-b> instead of <Right> and <C-h> instead of <BS>. On Stack Overflow/Super User they produce **strong text** and ## Heading ## respectively. I do not want this happen. I can examine Super User/Stack Overflow/some_other_site's javascript and write a userjs to do the job, but this method is not universal. I'm using Opera-10.51_pre6252 in Gentoo Linux.

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• Satellite TV on my PC?

  - by jasondavis

  What would be a good solution for hooking up the satellite TV box (Dish network) in my room to be able to watch it on my PC and possibly record video from it? Please share with me the best cards, cables, software, anything else needed to do this in the most efficient way? I am looking at the WinTV-HVR from Hauppauge. I am not sure, for performance, what would be the best to go with, PCI, PCI express, USB2.0? Also on the Hauppauge website I saw this note: "WinTV-PVR products will not work in PC systems with 4GB or more of memory." The new PC I am building will be 12-24gb of DDR3 RAM, does that mean their products will not work at all with my memory? So confused now!

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• Apps crashing - Android 4.3 in VirtualBox

  - by Nasenbaer

  Performance and stability problem with Android 4.3 in VM. Tried with x64 and x86 System. VirtualBox V4.3.2 in use. Android could be installed on x86 only. But there it seems to be successfully, using the "Linux 2.2" template on VirtualBox. 1024MB RAM and 2GB Harddisk defined. Some times Android browser is crashing and closing. In all cases stuff like "Skype" and "Plats vs Zombies" does never startup after installing. Crashes directly. "Plats vs Zombies 2" is not able to install. Is there any way of gettings such stuff work?

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• What are the minimum hardware requirements for the latest version of Android Jelly Bean OS?

  - by Stom

  I searched around, and there's no information that points exactly to the suggested, minimum, or otherwise dated information containing specifications on this. I want to install a newer version of Android on an older ZTE-X500 MetroPCS smartphone. However, I'd like to know the backwards compatibility in regards to using a newer featured OS with lackluster, limited hardware compared to today's smartphones, such as Galaxy S4. However, I still wish to do this. If Jelly Bean is too demanding, I will set up Honeycomb, or get a modified Honey Comb ROM, or tweak the source to my preferences. However, nothing outlines the specifics of the "system requirements" it suggests for optimum performance, such as RAM, processor speed, processor features, and/or any other features, like DMA, video circuit advancements, and/or sound and special hardware requirements noted as well. Please, if you will, point me to a source that mentions this, and please tell do not link me to any PDF file formats. Thank you. PS: I'm a computer programmer.

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