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• database on SSD: data only or the DBM program too?

  - by simone

  I plan on moving the data I use for statistical analysis (100-ish Gb) onto an SSD. The data is either sqlite single-file db's, or postgresql-managed data. The SSD is 240 Gb, 550 MB/s read and 520 MB/s write. Should I reserve that space for the data only, or would it be a good idea to install the operating system (Mac OS X) and the application directory (Adobe Suite, Microsoft Office and the like) on the SSD too? And would it make a substantial speed difference whether I also install the postgresql binaries on the SSD? I have plenty of other space (another 300Gb hard-drive, and a 1Tb one). Don't know the features of the non-SSD drives, though they're our standard equipment on all Macs, and they're definitely OK. Thanks.

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• How to stop blanking screen although I am active on Ubuntu Karmic on old IBM Laptop

  - by Glen S. Dalton

  How to stop blanking screen although I am active on Ubuntu Karmic on old IBM Laptop 600E? After some time of working on the machine the screen goes blank. When I hit ESC on the built-in keyboard (not on the attached USB keyboard where I work) it comes back and everything works fine until the next screen-blanking. I suspect it is some power management issue. When I use an old keyboard that has a ps2 connector it does not happen. So my guess is that the usb keyboard does not update the power management timer that detects when the session was last used? I am using fluxbox window manager. I do not want to disable power management because it is nice that the fan only works at the necessary speed (the fan spped is regulated which I can hear) But I could disable power management for testing purposes.

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• W3 Total Cache or WP Super Cache?

  - by javipas

  I'm just preparing the setup of a new VPS where I will migrate a WordPress blog with a good traffic (currently, around 40k pageviews a day), and I was thinking about the caching strategy. I've found different ideas and recommendations, but from previous experiences I will setup a Nginx+PHP-FPM+MySQL (LEMP) system on a Linode VPS. I've read also about setting Nginx as a reverse proxy with Apache, and even using Varnish too, but I don't know if all of this can benefit the speed/performance of the blog (that's the only thing that will be installed on the VPS). The question now is... would you recommend W3 Total Cache or WP Super Cache? I've used W3 on some blogs, but I haven't noticed great benefits and don't need all its options, so I think I could give the veteran WP Super Cache a try. Besides, some users have complained about W3 complex configuration and lack of performance (even consumig more CPU) on some cases.

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• Optimal Memory Configuration for Dell PowerEdge 1800 (Windows Server 2000 32bit)

  - by David Murdoch

  I am upgrading the memory on a Dell PowerEdge 1800 Server running Windows Server 2000 (32 bit). My Computer Properties currently reports "2,096,432 KB RAM" (4 modules @ 512MB each). Crucial.com scan reports: "Each memory slot can hold DDR2 PC2-5300 with a maximum of 2GB per slot. Maximum Memory Capacity:  12288MB Currently Installed Memory:  2GB Available Memory Slots:  2 Total Memory Slots:  6 Dual Channel Support:   No CPU Manufacturer:  GenuineIntel CPU Family:  Intel(R) Xeon(TM) CPU 2.80GHz Model 4, Stepping 1 CPU Speed:  2793 MHz Installed in pairs of modules." We will be completely replacing the old 512 MB modules. Will there be any performance difference between installing 4 modules @ 1GB vs. 2 modules @ 2GB?

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• Dell Dimension 2400 problem

  - by murgatroid99

  I have a new problem with a Dell Dimension 2400 PC. Until yesterday or the day before, it was working fine, but today when I press the power button the light on the power button turns yellow instead of green, the fan behind the processor increases speed until it sounds like a jet engine, and the computer does not boot up. I cleaned out the dust in the computer so that is not the problem. Also, the fan was blowing cold air. Do any of you know what might be causing this and how I might be able to fix it?

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• Vista x64: Improving troubleshoot approach skills

  - by Chau

  I'm not a Windows SuperUser, but neither just the regular user. I don't mind browsing the Registry, using Process Explorer, reading the Event logs, (un)installing new drivers and so on, but all this only makes me solve some problems. I tend though to run into problems where these tools aren't enough. Which tools should I learn about to improve my troubleshooting skills in Windows? Currently I'm using Windows Vista x64 (not moved to 7 yet), facing audio/video stuttering problems and I think this is a good place to improve my troubleshooting skills. I know this post is similar to this question, but my machine is only hanging occationally. Specs: Intel Q6600 Stock speed ASUS P5QD Turbo 4GB ram NVIDIA GTS-8800 640 HDA Xplosion 7.1 Seasonic 430W Windows Vista Business x64

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• Could a too low voltage during long periods damage my computer fan?

  - by Sopalajo de Arrierez

  Computer fans use to run at 12Volt, but most as for today they allow 9Volt or even less to slow down the fan speed (RPM, Revolutions Per Minute). In cases of too low voltage, the fan stops, but I can see it "trying to start again". For example: my Tacens 9dB fan stops at about 10 Volts, but to start it again, 10.5Volt is not enough, and the engine tries to move the fan (I can see a small movement as an "attempt" to move) each 1-5 seconds, but it does not succees, so the fan keeps at 0 RPM. Maybe that "attempt" to move could damage the internal engine of the fan when it last for hours or days?

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• Visible Keylogger (ie not evil)

  - by Ben Haley

  I want keylogging software on my laptop for lifelogging purposes. But the software I can find is targeted towards stealth activity. Can anyone recommend a keylogging software targeted towards personal backup. Ideal Functionality Runs publicly (like in the task bar). Easy to turn off (via keyboard shortcut is best... at least via button click) Encrypted log Fast Free Cross platform ( windows at least ) The best I have found is pykeylogger which does not attempt to be stealthy, but does not attempt to be visible either. I want a keylogger focused on transparency, speed, and security so I can safely record myself. *note: Christian has a similar question with a different emphasis

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• when to use squid on server side?

  - by ajsie

  so i have set up apache serving my php pages. i read about squid but don't understand why/how i should use it to speed up my web server. from what i've learned squid is located in same network (or another) and caches content requested by the web browsers, and then when another web browser wants a same page, squid returns that page cached locally, so it never sends a request to the apache server (faster response time for the client, and reduced load for the server). so it seems that squid is for the client side (web browser), and has nothing to do with the server side (apache). but then some people tell others how they have speeded up apache using squid. so im confused. could squid be used on the server side too? and how will it work?

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• Do I really need Microsoft Updates?

  - by Tony Wong

  When I install a fresh copy of XP home (bought it from the store.. not a copy) my pc rocks like lightening speed. But when I start installing all the updates, patches & less .NET 4.0 client (As the .NET 4.0 Client seems to bring machine to slow crawl). The pc starts to slow down.. like there is more resources to watch or something in the background is happening. So could I not get away with a awesome virus protector & awesome firewall set-up and avoid all the patches? The machine I have is a quad 4, 4gb ram and 2.3 GHZ process. Tons of room and the machine can run several apps at one time.. but when the updates happen.. its s-l-o-w!

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• how to run apache2 or nginx + php on iPhone? [closed]

  - by Rubytastic

  Is there a way to run Apache2 or Nginx with PHP on the iPhone? Im surprised so little info is available on this topic, as it seems quite interesting to host websites on an iPhone. Consider slow 3G connections or no 3G at all, and you want to demonstrate some webapplication you wrote... hosting them on the iphone would be an awsome way to fix the speed issues with the mobile network speeds. For the Ipad there are several addoptions available, nothing much usable on iphone / nginx apache2 search terms anywhere :( I want to host some websites on my iphone for demonstration purposes. So when im "out the office" Ill be able to very fast browse some websites that I host on the Iphone. there is no decent information out there, does anyone have a lead on how to do this? My question is specific to if nginx or apache2 can be run on the iphone, it would be nice if PHP would run on it too

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• Wireless connection switches off IP address

  - by Sanjay Gupta

  I have a Lenovo laptop with windows XP and a wireless connection at home. The wireless connection works when initially I switch on the computer. but if I leave it for even 5 minutes, the wireless is gone. Then I have to shut it off and start computer all over again, waiting for 5 minutes. Even if the wireless speed is 48Mbps or better, it gives the message "Renewing IP address" and gets stuck there not moving to the next stage. Other laptop in the household works fine and can be left on. Why does this happen ? I suspect that IP address is the problem and somehow is not registered in all the necessary files.

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• WIFI: iPhone/iPad getting much slower bandwidth than laptop

  - by Sam

  I just got cable internet installed (Comcast). It claims that my down speed should be 25mbit. Over wifi, I get close to that on my laptop, but only about 8 on average with my iPhone/iPad. I'm using testmy.net in the browser on all devices. I have an ARRIS / Motorola SurfBoard SB6141 DOCSIS 3.0 Cable Modem and a Medialink Wireless N Broadband Router. I read somewhere that disabling WMM and the firewall on the router would help (is this even a safe idea?). I've tried both, and neither seem to make much of a difference, if any at all (sidebar: I've noticed that my download speeds vary wildly with cable internet... on my laptop, I'll get 12 down, then 22 five minutes later. Is this typical for cable internet?).

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• Godaddy vs. Route53 for DNS

  - by tim peterson

  I have my website set up as an EC2 instance and my DNS is currently Godaddy. I'm considering switching to Amazon AWS Route53 for DNS. The one thing I noticed however is that Route53 charges monthly fees but I never get any bills from Godaddy. Obviously, nobody likes getting charged for something they can get for free. If Godaddy is cheaper, can anyone confirm that the page load speed of an EC2 instance is actually better via Route53 vs. Godaddy? If it is not faster or cheaper, can someone point out other reasons it might make sense to do this switch? thanks, tim

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• MacBook Pro - 72k vs 54k rpm drives - Heat and Noise

  - by webworm

  I am looking at a new 15" MacBook Pro for development purposes. I am planning to run a Virtual Machine for about 50% of my work (Windows 7 x64, IIS, SQL Server, and VS 2010). The upgrade from a 54000 rpm drive to a 72000 rpm is only $45. From what I understand the faster rotational speed of the 72000 rpm drive will help virtual machine performance. However, I am concerned that additional heat and fan noise might be an issue. I will be running mostly on A/C power so decreased battery life is not a major concern for me. Since I would be running with a Core i7 processor which gives off a fair amount of heat already I was wondering if it might be best to stay at 54000 rpm for the hard drive. What do you all think? Thanks!

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• Using XPath to access comments a flat hierachy

  - by Sebastian

  I have a given XML document (structure can not be changed) and want to get the comments that are written above the nodes. The document looks like this: <!--Some comment here--> <attribute name="Title">Book A</attribute> <attribute name="Author"> <value>Joe Doe</value> <value>John Miller</value> </attribute> <!--Some comment here--> <attribute name="Code">1</attribute> So comments are optional, but if there is one, I want to get the comment above each attribute. Using /*/comment()[n] would give me comment n, but for n=2 I would naturally get the comment of the third attribute, so there is no connection between attributes and comments Any ideas? Thanks

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• Generic Method to find the tuples used for computation in Postgres?

  - by Rahul

  If I have a table col1 | name | pay ------+------------------+------ 1 | Steve Jobs | 1006 2 | Mike Markkula | 1007 3 | Mike Scott | 1978 4 | John Sculley | 1983 5 | Michael Spindler | 1653 The user executes a sum query which sums the pay of people getting paid more than $1500. Is there a way to also implicitly know which tuples have been used which satisfy the condition for sum ? I know you can separately write another query to just return the primary key ids which satisfy the condition. But, Is there any other way to do that in the same query ? probably rewrite the query in some way ? or... any suggestion ?

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• Computer Studdering When Transferring Over Network

  - by Nalandial

  This is a really weird problem that I've never even seen before. When I copy to or from my server share, my computer studders terribly and the data transfers very slowly at only around 12MB/s. By studdering I mean the mouse skips around and all my applications respond very slowly; as soon as I cancel the transfer it resolves immediately. I looked at Task Manager and the CPU is only at ~35% with plenty of RAM free. This only started semi-recently; before, I had no problems and the transfer speed maxed out the gigabit connection. I have two hard drives in my computer. When I try transferring files between drives it's fine, but when I copy from the share to either drive or to it from either drive, I get studdering. I'm running Windows 7 x64. Anyone have any idea what's going on? Any help would be much appreciated.

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• Windows setup claims the installation source is not accessible. How do I fix this?

  - by Wil

  I'm trying to install Windows 7 Ultimate over my existing Windows 7 Professional. I downloaded the ISO from Microsoft and burned the install disc at the slowest speed possible (x3). I booted to the DVD, but at the second screen I am already getting an error! That screen I am choosing between "Upgrade" and "Custom". I am trying to choose "Custom" but then I get the error: Windows installation encountered an unexpected error. Verify that the installation sources are accessible, and restart the installation. Error code: 0xE0000100

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• Targus USB-to-RS232 not working with Linux?

  - by Ethan Leroy

  I have the Targus PA088 USB to RS232 converter, but it seems that it does not work with linux. Its RX and TX lights are flashing, but I can't see the data in minicom/picocom. When using it with Windows and hterm, everything's fine. Any idea what could be the problem? Additional info: When I plug in the adapter, I can see the following messages in /var/log/messages.log Nov 25 01:47:31 localhost kernel: [ 831.787066] usb 2-1.1: new full speed USB device number 5 using ehci_hcd Nov 25 01:47:32 localhost kernel: [ 832.554810] mct_u232 2-1.1:1.0: MCT U232 converter detected Nov 25 01:47:32 localhost kernel: [ 832.555002] usb 2-1.1: MCT U232 converter now attached to ttyUSB0 Nov 25 01:47:32 localhost mtp-probe: checking bus 2, device 5: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1" Nov 25 01:47:32 localhost mtp-probe: bus: 2, device: 5 was not an MTP device

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• Windows File Sharing - Long Initial Delay

  - by Isaac Sutherland

  I have two Windows 7 machines connected to a router. I created a shared folder on machine A, and I can access it from machine B. The transfer speed is great. However, there is sometimes a long initial delay when I try to access the shared folder from machine B. I'll click to open the folder, and windows explorer pauses for a few minutes before actually loading the contents of the folder. After it loads, however, I can navigate the subfolders and edit files with no noticeable delay. Then, some time later, I will get the huge delay on saving a file, after which subsequent saves have no delay. What is the problem here, and how can I fix it?

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• SQL Server: collect values in an aggregation temporarily and reuse in the same query

  - by Erwin Brandstetter

  How do I accumulate values in t-SQL? AFAIK there is no ARRAY type. I want to reuse the values like demonstrated in this PostgreSQL example using array_agg(). SELECT a[1] || a[i] AS foo ,a[2] || a[5] AS bar -- assuming we have >= 5 rows for simplicity FROM ( SELECT array_agg(text_col ORDER BY text_col) AS a ,count(*)::int4 AS i FROM tbl WHERE id between 10 AND 100 ) x How would I best solve this with t-SQL? Best I could come up with are two CTE and subselects: ;WITH x AS ( SELECT row_number() OVER (ORDER BY name) AS rn ,name AS a FROM #t WHERE id between 10 AND 100 ), i AS ( SELECT count(*) AS i FROM x ) SELECT (SELECT a FROM x WHERE rn = 1) + (SELECT a FROM x WHERE rn = i) AS foo ,(SELECT a FROM x WHERE rn = 2) + (SELECT a FROM x WHERE rn = 5) AS bar FROM i Test setup: CREATE TABLE #t( id INT PRIMARY KEY ,name NVARCHAR(100)) INSERT INTO #t VALUES (3 , 'John') ,(5 , 'Mary') ,(8 , 'Michael') ,(13, 'Steve') ,(21, 'Jack') ,(34, 'Pete') ,(57, 'Ami') ,(88, 'Bob') Is there a simpler way?

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• Why is cpu power management not working in Server 2012 with Hyper-V?

  - by Roland

  We've been using Server2008R2 with Hyper-V for a couple of years now and chose it at the time because of its ability to make use of Intel SpeedStep and AMD PowerNow! Now with Server 2012 and Hyper-V V3, all power management abilities seem to be gone. The CPUs are always at full speed and our servers need twice the energy as before while idling. (Yes, the CPU P-states are enabled in the BIOS) Is this by design? Is there a workaround to enable cpu power management again? Despite the great new features of Hyper-V 3, this would be a show-stopper for us since we are very concerned about energy consumption.

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• Transferring existing files from ext3 to ZFS (on FreeBSD)

  - by peppergrower

  I use an old machine as a file server, for backups, and as a testbed for development. I currently have Debian installed, but I'm very interested in FreeBSD because of ZFS: I really, really like its file integrity features. Before I switch, however, I wanted to ask: what's the best way to migrate my ~400GB of files from the current filesystem (ext3) to ZFS? My number-one requirement is that the migration be absolutely reliable: I don't want to lose any data. (I'll be backing it up before doing this anyway, but still.) My secondary goal is speed: I'd rather not have this take overnight if it doesn't have to. Recommendations? Is FUSE for FreeBSD stable enough to use? What about FreeBSD's native read support for ext3? NFS, maybe? How have you done this?

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• problems with UTF-8 encoding in PHP

  - by user296516

  Hi guys, The characters I am getting from the URL, for example www.mydomain.com/?name=john , were fine, as longs as they were not in Russian. If they were are in Russian, I was getting '????'. So I added $name= iconv("cp1251","utf-8" ,$name); and now it works fine for Russian and English characters, but screws up other languages. :))) For example 'Janis' ( Latvian ) that worked fine before iconv, now turns into 'j??nis'. Any idea if there's some universal encoder that would work with both the Cyrillic languages and not screw up other languages?

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