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• Sysadmin 101: How can I figure out why my server crashes and monitor performance?

  - by bflora

  I have a Drupal-powered site that seems to have neverending performance problems. It was butt-slow about 5 months ago. I brought in some guys who installed nginx for anonymous visitors, ajaxified a few queries so they wouldn't fire during page load, and helped me find a few bottlenecks in the code. For about a month, the site was significantly faster, though not "fast" by any stretch of the word. Meanwhile, I'm now shelling out $400/month to Slicehost to host a site that gets less than 5,000/uniques a day. Yes, you read that right. Go Drupal. Recently the site started crashing again and is slow again. I can't afford to hire people to come in, study my code from top to bottom, and make changes that may or may not help anymore. And I can't afford to throw more hardware at the problem. So I need to figure out what the problem is myself. Questions: When apache crashes, is it possible to find out what caused it to crash? There has to be a way, right? If so, how can I do this? Is there software I can use that will tell me which process caused my server to die? (e.g. "Apache crashed because someone visited page X." or "Apache crashed because you were importing too many RSS items from feed X.") There's got to be a way to learn this, right? What's a good, noob-friendly way to monitor my current apache performance? My developer friends tell me to "just use Top, dude," but Top shows me a bunch of numbers without any context. I have no clue what qualifies as a bad number or a good number in Top, or which processes are relevant and which aren't. Are there any noob-friendly server monitoring tools out there? Ideally, I could have a page that would give me a color-coded indicator about how apache is performing and then show me a list of processes or pages that are sucking right now. This way, I could know when performance is bad and then what's causing it to be so bad. Why does PHP memory matter? My apparently has a 30MB memory foot print. Will it run faster if I bring that number down? Thanks for any advice. I spent a year or so trying to boost my advertising income so I could hire a contractor to solve my performance woes. I didn't want to have to learn all this sysadmin voodoo. I'm now resigned to the fact that might not have a choice.

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• How to debug MinGW32-make batch files?

  - by bryceman

  I'm having some difficulties building up some cross-platform Makefiles, and I'm getting errors from processes called by mingw32-make that don't make the problem clear. I've tried calling mingw32-make with "-d", and I get a lot of debug output, but the actual program invocations are hidden in temporary batch files that are immediately deleted. Is there any way to keep these batch files around, so that I can actually see what mingw32-make is doing under the hood, and fix what I assume is my problem?

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• crude Runtime.exec to call java -cp not working in linux

  - by pstanton

  I'm using a java process to spawn many other java processes using Runtime.exec(cmd) where cmd is like the following: java -cp "MyJar.jar" pkg.MyClass some-more-arguments running the same command from the command line works fine in windows and linux, however when my spawning java process calls the command via Runtime.exec it works in windows but not in linux. in linux i get Exception in thread "main" java.lang.NoClassDefFoundError: pkg/MyClass any ideas?

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• Disabling script max-execution-time in flex?

  - by Stefan Kendall

  How do I completely disable the max-execution-time for scripts in flex? The configurable max is 60 seconds, but I'm calling off to other interactive processes which will probably run much longer than that. Is there an easy way to disable the maximum script execution time across my entire application?

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• How does fork() return for son process

  - by EpsilonVector

  I know htat fork() returns differently for the son and father processes, but I'm unable to find information on how this happens. How does the son process receives the return value 0 from fork? And what is the difference in regards to the call stack? As I understand it, for the father it goes something like this: father process--invokes fork--system_call--calls fork--fork executes--returns to--system_call--returns to--father process. What happens in the son side?

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• Sql-server Database query help

  - by menacheb

  Hi, I have a Database (Sql-server) with table named 'ProcessData' and columns named 'Process_Name' (Data Type: nvarchar(50)), 'Start_At' (DataType: DateTime) and 'End_At' (Data Type: DateTime). I need to konw for each 'Time-Interval' (let's say 1 second) how many processes (Process_Name = PN) was open (after or equal to the 'Start_at' column and before or equal to the 'End_At' column) during this time (It can be a few rows with the same data). Does anyone know how to make this query? Many thanks,

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• valgrind on server process

  - by Pigol

  hi i am new to valgrind. I know how to run valgrind on executable files from command line. But how do you run valgrind on server processes like apache/myqld/traffic server etc .. I want to run valgrind on traffic server (http://incubator.apache.org/projects/trafficserver.html) to detect some memory leaks taking place in the plugin I have written. Any suggestions ? thanks, pigol

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• .NET: Writing DataAccess dll

  - by RedsDevils

  I would like to write all data relations processes (general functions regarding with DataAccess via .NET) in dll and I want to use it repeatedly. What kinds of functions should have in that dll? Some want to use Stored Procedures , Some with Statements. Can you all suggest me? Please guide me! Thanks all!

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• How Linux system monitor gets process stats

  - by paultop6

  Hi all, Im making a simple alternative to the default linux system monitor. Im looking to know how it lifts the process stats, which is displays in the Processes tab. It probably runs off /proc, but im unsure. Also, where could i find the source code for the system monitor program? Regards Paul

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• .NET: Wrinting DataAccess dll

  - by RedsDevils

  I would like to write all data relations processes (general functions regarding with DataAccess via .NET) in dll and I wanna use it repeatedly. What kinds of functions should have in that dll? Some want to use Storedprocedures , Some with Statemets. Can you all suggest me? Please guide me! Thanks all!

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• How do I reconnect to Memcache when forking in rails?

  - by Daniel Huckstep

  I have a rails 3 application, and a script called by rails runner. This script forks and does some stuff in other processes. I do the proper thing with ActiveRecord before forking, where I disconnect-fork-reconnect and all that jazz. My question is I also use memcache for the Rails.cache but should I be disconnecting-reconnecting that too for my forks? If so, how would I go about that in the rails way.

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• Is it possible to make web app proactive rather than reactive?

  - by Ari B.

  Web applications traditionally follow the request/response cycle, where a request is made by a user or another web app. However, I'm curious if it is possible to make a web app automatically initiate certain tasks upon it's deployment to a app server. For example, let's say we have a web app that retrieves and processes data. Is it possible to configure this app to automatically retrieve and process data when certain criteria are met, rather than needing a request from a user/another web app?

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• Fairness: Where can it be better handled?

  - by Srinivas Nayak

  Hi, I would like to share one of my practical experience with multiprogramming here. Yesterday I had written a multiprogram. Modifications to sharable resources were put under critical sections protected by P(mutex) and V(mutex) and those critical section code were put in a common library. The library will be used by concurrent applications (of my own). I had three applications that will use the common code from library and do their stuff independently. my library --------- work_on_shared_resource { P(mutex) get_shared_resource work_with_it V(mutex) } --------- my application ----------- application1 { *[ work_on_shared_resource do_something_else_non_ctitical ] } application2 { *[ work_on_shared_resource do_something_else_non_ctitical ] } application3 { *[ work_on_shared_resource ] } *[...] denote a loop. ------------ I had to run the applications on Linux OS. I had a thought in my mind, hanging over years, that, OS shall schedule all the processes running under him with all fairness. In other words, it will give all the processes, their pie of resource-usage equally well. When first two applications were put to work, they run perfectly well without deadlock. But when the third application started running, always the third one got the resources, but since it is not doing anything in its non-critical region, it gets the shared resource more often when other tasks are doing something else. So the other two applications were found almost totally halted. When the third application got terminated forcefully, the previous two applications resumed their work as before. I think, this is a case of starvation, first two applications had to starve. Now how can we ensure fairness? Now I started believing that OS scheduler is innocent and blind. It depends upon who won the race; he got the largest pie of CPU and resource. Shall we attempt to ensure fairness of resource users in the critical-section code in library? Or shall we leave it up to the applications to ensure fairness by being liberal, not greedy? To my knowledge, adding code to ensure fairness to the common library shall be an overwhelming task. On the other hand, believing on the applications will also never ensure 100% fairness. The application which does a very little task after working with shared resources shall win the race where as the application which does heavy processing after their work with shared resources shall always starve. What is the best practice in this case? Where we ensure fairness and how? Sincerely, Srinivas Nayak

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• Debugging utilities for Linux process hang issues?

  - by Niranjan

  I have a daemon process which does the configuration management. all the other processes should interact with this daemon for their functioning. But when I execute a large action, after few hours the daemon process is unresponsive for 2 to 3 hours. And After 2- 3 hours it is working normally. Debugging utilities for Linux process hang issues? How to get at what point the linux process hangs?

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• What other RM methodologies are well know besides FMEA??

  - by Pamela

  Risk management is defined trough several processes that pretend to identify and control the possible risks that may affect the succes of a project. The most common methodology for RM is Failure Mode Effect Analysis. Does anybody know some other methodologies used in the management of risk??

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• If I read/write to a TCP socket that is on localhost, will that avoid firewalls?

  - by ryeguy

  If I want to open a TCP socket between 2 processes on the same computer, will having the server run on localhost and the client connect on localhost be safe from any firewall intervention?

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• Processor affinity settings for Linux kernel modules?

  - by Stephen Pape

  In Windows, I can set the processor affinity of driver code using KeSetSystemAffinityThread, and check which processor my code is running on using KeGetCurrentProcessorNumber. I'm trying to do something similar in a Linux kernel module, but the only affinity calls I can see are for userland processes. Is there any way to do this, so that I can run assembly code on a specific processor? (i.e. sgdt)

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• Sharepoint Wikis

  - by Keng

  Ok, I've seen a few posts that mention a few other posts about not using SP wikis because they suck. Since we are looking at doing our wiki in SP, I need to know why we shouldn't do it for a group of 6 automation-developers to document the steps in various automated processes and the changes that have to be made from time to time. Thanks.

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• How to I serialize a large graph of .NET object into a SQL Server BLOB without creating a large bu

  - by Ian Ringrose

  We have code like: ms = New IO.MemoryStream bin = New System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bin.Serialize(ms, largeGraphOfObjects) dataToSaveToDatabase = ms.ToArray() // put dataToSaveToDatabase in a Sql server BLOB But the memory steam allocates a large buffer from the large memory heap that is giving us problems. So how can we stream the data without needing enough free memory to hold the serialized objects. I am looking for a way to get a Stream from SQL server that can then be passed to bin.Serialize() so avoiding keeping all the data in my processes memory. Likewise for reading the data back... Some more background. This is part of a complex numerical processing system that processes data in near real time looking for equipment problems etc, the serialization is done to allow a restart when there is a problem with data quality from a data feed etc. (We store the data feeds and can rerun them after the operator has edited out bad values.) Therefore we serialize the object a lot more often then we de-serialize them. The objects we are serializing include very large arrays mostly of doubles as well as a lot of small “more normal” objects. We are pushing the memory limit on a 32 bit system and make the garage collector work very hard. (Effects are being made elsewhere in the system to improve this, e.g. reusing large arrays rather then create new arrays.) Often the serialization of the state is the last straw that courses an out of memory exception; our peak memory usage is while this serialization is being done. I think we get large memory pool fragmentation when we de-serialize the object, I expect there are also other problem with large memory pool fragmentation given the size of the arrays. (This has not yet been investigated, as the person that first looked at this is a numerical processing expert, not a memory management expert.) Are customers use a mix of Sql Server 2000, 2005 and 2008 and we would rather not have different code paths for each version of Sql Server if possible. We can have many active models at a time (in different process, across many machines), each model can have many saved states. Hence the saved state is stored in a database blob rather then a file. As the spread of saving the state is important, I would rather not serialize the object to a file, and then put the file in a BLOB one block at a time. Other related questions I have asked How to Stream data from/to SQL Server BLOB fields? Is there a SqlFileStream like class that works with Sql Server 2005?

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• Changing the working directory for a process remotely

  - by Michael

  I've got an application that has a bug right now, but we're unable to update the end-user to get the fix out. What a possible workaround would be is to change the working directory to the application's install directory, but from what I can tell, there's no way to do that outside of the program itself. Is there some sort of Windows API call that can change other processes' working directories, or is that not available due to security issues? I figure it's not possible.

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• Threading in GWT (Client)

  - by 8EM

  From what I understand, the entire client side of a GWT application is converted to Javascript when you build, therefore I suppose this question is related to both Javascript and the possibilities that GWT offers. I have a couple of dozen processes that will need to be initiated in my GWT application, each process will then continuously make calls to a server. Does GWT support threading? Does the GWT client side support threading?

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• Concept of GUI's - Centralized or decentralized

  - by wvd

  Hello all, Since a few months I've been learning Erlang, and now it was time to do some basic GUI. After some quick research I saw there was an interesting library called 'wxi' (based on Fudgets of Haskell) which uses a different approach on GUI's. No central loop, every widget processes it's own events and handles it's own data. What do you guys think about this? It looks like it kind of can be efficient in languages such as Erlang, and it's an interesting approach. William van Doorn

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• How to delay putting process in background until after it is ready to serve, in shell

  - by Jakub Narebski

  I have two processes: a server that should be run in background, but starts serving requests after a delay, and a client that should be started when server is ready. The server prints line containg "Acceptin connections" to its stderr when ready (server stderr is redirected to a file when running it in background). How to delay putting server process in background until server is ready to serve requests? Alternatively, how to delay running client until server is ready? Language: shell script (or optionally Perl).

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• How can i uniquely identify users trying to open() a kernel module?

  - by user349072

  Dear Gurus, I'm working on a Kernel module and i'm trying to Uniquely identify each one of the users trying to open() the module ( can be either processes or threads ). what is the best way to identify them? is there an ID i can get from a system call? i wish to get all users in a list that specifies whether they're trying to open the module for read \ write and i need to know which one tried acting... many many thanks. in regards, IK

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• About fork system call and global variables

  - by lurks

  I have this program in C++ that forks two new processes: #include <pthread.h> #include <iostream> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> #include <cstdlib> using namespace std; int shared; void func(){ extern int shared; for (int i=0; i<10;i++) shared++; cout<<"Process "<<getpid()<<", shared " <<shared<<", &shared " <<&shared<<endl; } int main(){ extern int shared; pid_t p1,p2; int status; shared=0; if ((p1=fork())==0) {func();exit(0);}; if ((p2=fork())==0) {func();exit(0);}; for(int i=0;i<10;i++) shared++; waitpid(p1,&status,0); waitpid(p2,&status,0);; cout<<"shared variable is: "<<shared<<endl; cout<<"Process "<<getpid()<<", shared " <<shared<<", &shared " <<&shared<<endl; } The two forked processes make an increment on the shared variables and the parent process does the same. As the variable belongs to the data segment of each process, the final value is 10 because the increment is independent. However, the memory address of the shared variables is the same, you can try compiling and watching the output of the program. How can that be explained ? I cannot understand that, I thought I knew how the fork() works, but this seems very odd.. I need an explanation on why the address is the same, although they are separate variables.

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