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• Postgres 9.0 locking up, 100% CPU

  - by Jake

  We are having a problem where our Postgres 9.0 server occasionally locks up and kills our webapp. Restarting Postgres fixes the problem. Here's what I've been able to observe: First, usage of one CPU jumps to 100% for a few minutes Disk operations drop to ~0 during this time Database operations drop to 0 (blocks and tuples per sec) Logs show during this time: WARNING: worker took too long to start; cancelled WARNING: worker took too long to start; cancelled No Queries in logs (only those over 200ms are logged) No unusually long-running queries logged before or during Then the second CPU jumps to 100% The number of postgres processes jumps from the usual 8-10 to ~20 Matched by a spike in Postgres Blocks per second (about twice normal) Logs show LOG: could not accept SSL connection: EOF detected Queries are running but slow Restarting postgres returns everything to normal Setup: Server: Amazon EC2 Large Ubuntu 10.04.2 LTS Postgres 9.0.3 Dedicated DB server Does anyone have any idea what's causing this? Or any suggestions about what else I should be checking out?

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• BitSet to and from integer/long

  - by ataylor

  If I have an integer that I'd like to perform bit manipulation on, how can I load it into a java.util.BitSet? How can I convert it back to an int or long? I'm not so concerned about the size of the BitSet -- it will always be 32 or 64 bits long. I'd just like to use the set(), clear(), nextSetBit(), and nextClearBit() methods rather than bitwise operators, but I can't find an easy way to initialize a bit set with a numeric type.

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• Processor speeds on my machine don't live up to manufacturer hype

  - by atch

  Why am I not seeing the promised speed claims of processor manufacturers on my computer? Producers of processors claim that their product can perform so many thousands (or millions) of operations per second. And yet on my machine (4GB, 3500hz), the typical program (Word, Visual Studio etc.) takes at least 10 seconds to start. I've formatted my hard drive and ticked all the necessary boxes to optimize my machine and yet I'm not seeing the promised speeds. Say it takes Outlook ten seconds to load. How many millions of operations does it really go through in order to start up?

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• Agile sysadmin and devops - How to accomplish?

  - by Marco Ramos

  Nowadays, agile systems adminitration and devops are some of the most trending topics regarding systems administration and operations. Both these concepts are mainly focused on bridging the gap between operations/sysadmins and the projects (developers, business, etc). Even if you never heard of the devops concept, I'm sure that this topic is your concern too. So, what tools and techniques do you use to accomplish devops in you companies? I'm particularly interested in topics like change management, continous integration and automatization, but not only. Please share your thoughts. I'm looking forward to read your answers/opinions :)

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• Monitor the shell activity of a user on your Unix system?

  - by Joseph Turian

  Trust, but verify. Let's say I want to hire someone a sysadmin, and give them root access to my Unix system. I want to disable X windows for them, only allow shell usage (through SSH, maybe), so that all operations they perform will be through the shell (not mouse operations). I need a tool that will log to a remote server all commands they issue, as they issue them. So even if they install a back door and cover their tracks, that will be logged remotely. How do I disable everything but shell access? Is there a tool for instantaneously remotely logging commands as they are issued?

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• Windows 2008 R2 Server Core Disk Space Requirements/Recomendations

  - by Richard West

  I'm in the preparation stage to roll out a few Windows 2008 R2 Server Core in my VMware ESX environment. In looking over the documentation it looks like Server Core can operate in a little as 6.5 GB of hard drive space. Less disk space required. A Server Core installation requires only about 3.5 gigabytes (GB) of disk space to install and approximately 3 GB for operations after the installation. I am curious as to anyone’s real world experience and recommendations with regard to this requirement. Is it realistic? A little bit about our environment: Less than 25 users, and around 75 computers/servers in our current AD system. These systems will be responsible for normal AD operations and print servers for 5 printers - nothing to big here.

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• How to avoid Memory "Hard Fault/sec"

  - by Flavio Oliveira

  i've a problem on my windows 2008 server x64, and i cannot understand how can i solve it. i'm looking to Resource Monitor and see about 100 to 200 hard faults/sec. and generally the machine is slow. As i've readed a bit it is caused by a "memory Page" that is no longer available on physical memory and causes a io operations (disk) and it is a problem. The current hardware is a intel core2duo E8400 (3.0GHz) with 6GB RAM on a Windows Server Web 64-bit. Actually the machine have about 2GB Ram used what having 4Gb available to use, Why is the machine requires that high level of Disk operations? what can i do to increase the performance? Im experiencing a memory issues? what should be my starting point?

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• Questions on SQL Server 2008 Full-Text Search

  - by Eddie

  I have some questions about SQL 2K8 integrated full-text search. Say I have the following tables: Car with columns: id (int - pk), makeid (fk), description (nvarchar), year (int), features (int - bitwise value - 32 features only) CarMake with columns: id (int - pk), mfgname (nvarchar) CarFeatures with columns: id (int - 1, 2, 4, 8, etc.), featurename (nvarchar) If someone searches "red honda civic 2002 4 doors", how would I parse the input string so that I could also search in the "CarMake" and "CarFeatures" tables?

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• Not enough storage is available to process this command

  - by Mohit

  I am getting this error on almost all of the operations on a Windows 7 pro 32 bit machine. By operations I mean anything I do. Update a repo from subversion. Access a local IIS Site. Copy a big folder. Run an installer.and sometime if I try again. It get solved. I think there is something wrong wit windows7 . I searched around and found posts suggesting to increase IRPStackSize value in registry I did that no Luck. I am using Microsoft Security Essentials Version: 1.0.1961.0 as my antivirus package Once this errors starts popping up. I have to restart and then in after some random time. It starts showing up again. Any help is appreciated. I am losing lot of my time in restarting my system or retrying again and again.

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• Is there a way to communicate DBMS with raw memory block or binaries

  - by darkcminor

  I am trying to communicate a numerical matrix operations library like LAPACK with any DBMS. Is it possible to send/receive complete matrices as binary or as a direct memory pointers to process them (it will be something like: The Outside library processes data stored in DBMS, then it computes some huge matrix stuff and then via memory block or a binary DBMS get the result from library)? The main purpose is speed and avoid passing through a flat file, and last but not least, use library toefficiently do some operations DBMS are not designed to. * Is it possible that Oracle, SQL Server, MySQL support this technique?.

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• Correct password for ssh key rejected when ssh-d into machine

  - by user20342

  When I am logged into my machine directly, I can do all git operations, and when prompted for a password, the password is accepted. When I ssh into the same box and run git operations on the same repos, the password is rejected. Relevant section of .ssh/config looks like this: # Generic settings Host * ServerAliveInterval 600 ControlPath /tmp/ssh-%r@%h:%p ControlMaster auto KeepAlive yes IdentityFile ~/.ssh/id_rsa.pub Transaction looks like this when I login when I ssh into my box: {12-12-03 9:41}hbrown-wks2:~/workspace/spt/project@master??? hbrown% git pull Enter passphrase for key '/home/hbrown/.ssh/id_rsa.pub': Enter passphrase for key '/home/hbrown/.ssh/id_rsa.pub': Enter passphrase for key '/home/hbrown/.ssh/id_rsa.pub': Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists. Using bash does not appear to make a difference (i.e. ssh-agent /bin/bash). This is a recent development, but I can't cite the change that caused it.

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• Getting a specific bit value in a byte string

  - by ignoramus

  There is a byte at a specific index in a byte string which represents eight flags; one flag per bit in the byte. If a flag is set, its corresponding bit is 1, otherwise its 0. For example, if I've got b'\x21' the flags would be 0001 0101 # Three flags are set at indexes 3, 5 and 7 # and the others are not set What would be the best way to get each bit value in that byte, so I know whether a particular flag is set or not? (Preferably using bitwise operations)

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• What is the most effective way to test for combined keyboard arrow direction in ActionScript 3.0?

  - by Relee

  I need to monitor the direction a user is indicating using the four directional arrow keys on a keyboard in ActionScript 3.0 and I want to know the most efficient and effective way to do this. I've got several ideas of how to do it, and I'm not sure which would be best. I've found that when tracking Keyboard.KEY_DOWN events, the event repeats as long as the key is down, so the event function is repeated as well. This broke the method I had originally chosen to use, and the methods I've been able to think of require a lot of comparison operators. The best way I've been able to think of would be to use bitwise operators on a uint variable. Here's what I'm thinking var _direction:uint = 0x0; // The Current Direction That's the current direction variable. In the Keyboard.KEY_DOWN event handler I'll have it check what key is down, and use a bitwise AND operation to see if it's already toggled on, and if it's not, I'll add it in using basic addition. So, up would be 0x1 and down would be 0x2 and both up and down would be 0x3, for example. It would look something like this: private function keyDownHandler(e:KeyboardEvent):void { switch(e.keyCode) { case Keyboard.UP: if(!(_direction & 0x1)) _direction += 0x1; break; case Keyboard.DOWN: if(!(_direction & 0x2)) _direction += 0x2; break; // And So On... } } The keyUpHandler wouldn't need the if operation since it only triggers once when the key goes up, instead of repeating. I'll be able to test the current direction by using a switch statement labeled with numbers from 0 to 15 for the sixteen possible combinations. That should work, but it doesn't seem terribly elegant to me, given all of the if statements in the repeating keyDown event handler, and the huge switch. private function checkDirection():void { switch(_direction) { case 0: // Center break; case 1: // Up break; case 2: // Down break; case 3: // Up and Down break; case 4: // Left break; // And So On... } } Is there a better way to do this?

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• What are performance limits of a database?

  - by Tommy

  What are some rough performance limits (read/s, write/s) for a single database server (no master-slave architecture), assuming storage on disk? How many read/s, write/s, depending on the kind of disk? (SSD vs non-SSD) , assuming simple operations (select one row by primary key, update one row, correctly indexed). I assume this limit is dependent on disk seek/write. EDIT: My question is more about getting rough metrics of the number of operations a database supports: to be able to know for example, if a new feature triggering 300 inserts/s can be supported without scaling out with additional servers.

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• recursive add binary numbers

  - by davit-datuashvili

  i need following algorithm let say we have 5 //101 and 7 //111 numbers are arbitrary i need to add these numbers using the recursive method and at the same time using bitwise methods such that result should be 101 + 111 110 0 or 12 can anybody help me?

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• Access Denied on LAN IIS Access via Integrated Authentication

  - by Pharao2k

  I have an IIS 7.5 (Win2k8R2) Webserver, which publishes an UNC Share (on a Fileserver) with restricted access. The AppPool Identity is a Domain User-Account with read access to mentioned UNC path. Authentication modes are set to Anonymous and Integration Authentication. When I access the path via localhost from the Webserver itself, it works, but if I try the Hostname or IP from either the Webserver or a Client, I get three authentication prompts (does not accept my credentials) and a 401.3 Unauthorized error message (but it states that I am logged in as my normal credentials which definitely have access rights to the UNC path and its files). Security Zone is set to Local Intranet. Sysiniternals Process Monitor lists CreateFile operations on the UNC path (and other existing files in it) with Access Denied and Impersonating on the correct credentials. I don't understand why it is not working, it seems to use the correct credentials on every step on the way but fails with is operations.

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• Not enough storage is available to process this command

  - by Mohit

  I am getting this error on almost all of the operations on a Windows 7 pro 32 bit machine. By operations I mean anything I do. Update a repo from subversion. Access a local IIS Site. Copy a big folder. Run an installer.and sometime if I try again. It get solved. I think there is something wrong wit windows7 . I searched around and found posts suggesting to increase IRPStackSize value in registry I did that no Luck. I am using Microsoft Security Essentials Version: 1.0.1961.0 as my antivirus package Once this errors starts popping up. I have to restart and then in after some random time. It starts showing up again. Any help is appreciated. I am losing lot of my time in restarting my system or retrying again and again.

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• Is Sql Azure useful without windows azure?

  - by KallDrexx

  I am currently doing some research to get some preliminary IT cost projections for a project, and I was looking at Azure. Since this is a startup, I do not want to deal with the IT operations myself and instead am looking at having it all professionally hosted. I am looking at azure due to the SLA assurances, already in place disaster recovery operations, and the reliability. I'm playing with some numbers, and I am wondering if hosting my database on Sql Azure is an option, while hosting the actual webpage on another host until I need the frontend scalability of Azure. Is this actually feasible or will the latency in requests between the web host and azure be too much and I would be better off hosting both on the same service?

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• Comparing floats in their bit representations

  - by sczizzo

  Say I want a function that takes two floats (x and y), and I want to compare them using not their float representation but rather their bitwise representation as a 32-bit unsigned int. That is, a number like -495.5 has bit representation 0b11000011111001011100000000000000 or 0xC3E5C000 as a float, and I have an unsigned int with the same bit representation (corresponding to a decimal value 3286614016, which I don't care about). Is there any easy way for me to perform an operation like <= on these floats using only the information contained in their respective unsigned int counterparts?

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• Is it good practice to use the XOR (^) operator in Java for boolean checks?

  - by Pete

  I personally like the 'exclusive or' operator when it makes sense in context of boolean checks because of its conciseness. I much prefer to write if (boolean1 ^ boolean2) { //do it } than if((boolean1 && !boolean2) || (boolean2 && !boolean1)) { //do it } but I often get confused looks (from other experienced java developers, not just the newbies), and sometimes comments about how it should only be used for bitwise operations. I'm curious as to the best practices others use around the '^' operator.

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• 7.0.1 and Photoshop openGL requirements

  - by mcgd

  Hi, I'm running Workstation 7.0.1 on a 64-bit Linux host, with a Vista guest, and the Aero theme works a treat - full marks for getting that working! However, when running Photoshop there are some operations (like interactive image rotation) that seem to require graphics support that VMWare doesn't have - attempting to do these operations returns an error that the functionality "only works with OpenGL enabled windows". It seems that it needs OpenGL 2.0 and Shader Model 3.0 which I gather are supported under Workstation 7 - do I need to put in additional settings of some kind? I've updated to the right version of VMWare Tools, and the video driver is listed as "VMWare SVGA 3D (Microsoft Corporation - WDDM)". I see that in 6.5 there was an option to switch between the beta WDDM driver and the SVGAII driver, but I assume the features of both of these would have been merged into the standard driver in 7.0? Thanks -Matthew

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• bit ordering and endianess

  - by Neeraj

  I am reading a file byte-by-byte. Say for example i have this byte: 0x41 (0100 0001) represented in hex. Now, I want the first three bits of this byte, i.e (010). I can use bitwise logic to extract the first three bits, but my question is will the first three bits be independent of endianess of the machine.(i.e they can't be 001)? Thanks,

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• How to store a 64 bit integer in 2 32 bit integers and convert back again

  - by Stowelly

  Hi, basically exactly as the title says, I'm pretty sure its just a matter of some bitwise operations, I'm just not entirely sure of exactly what I should be doing, and all searches return back "64 bit vs 32 bit" etc etc thanks

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• All possible types of interview questions

  - by halivingston

  A lot of tech interviews asks these "kinds" of questions, so I thought I'd make a list for myself and others: (1) Linked Lists (2) Strings (3) Trees (4) Bitwise Manips (6) Recursion (I hate these ones, I can never get these, any tips?)

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• Sending multiple checkbox options

  - by Grunje_D_D

  Hi, I'm creating a used cars website (written in PHP), and I'm stuck on sending advanced search options from form. I have more than 30 of them and I wonder if it's possible, and how, to send them in one variable (for example &options=1,2,3,5,6,10 or some other way..). Also I've heard that this is possible with "bitwise" but I don't have a clue how to do that. Or if someone have a better idea, please let me know. Thanx

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