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  • Why dd finishes instantly when pipelining to cat?

    - by agsamek
    I start bash on Cygwin and type: dd if=/dev/zero | cat /dev/null It finishes instantly. When I type: dd if=/dev/zero > /dev/null it runs as expected and I can issue killall -USR1 dd to see the progress. Why does the former invocation finishes instantly? Is it the same on a Linux box? * Explanation why I asked such stupid question and possibly not so stupid question I was compressing hdd images and some were compressed incorrectly. I ended up with the following script showing the problem: while sleep 1 ; do killall -v -USR1 dd ; done & dd if=/dev/zero bs=5000000 count=200 | gzip -c | gzip -cd | wc -c Wc should write 1000000000 at the end. The problem is that it does not on my machine: bash-3.2$ dd if=/dev/zero bs=5000000 count=200 | gzip -c | gzip -cd | wc -c 13+0 records in 12+0 records out 60000000 bytes (60 MB) copied, 0.834 s, 71.9 MB/s 27+0 records in 26+0 records out 130000000 bytes (130 MB) copied, 1.822 s, 71.4 MB/s 200+0 records in 200+0 records out 1000000000 bytes (1.0 GB) copied, 13.231 s, 75.6 MB/s 1005856128 Is it a bug or am I doing something wrong once again?

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  • How to effectively have less php-cgi processes running?

    - by João Pinto Jerónimo
    My server is a Linode 512, and on it I run a Wordpress MU with 3 websites (they don't get a lot of visitors) and a couple of NodeJS apps. I need to switch to Lighttpd because Apache 2 was using about 59% of the server's RAM, and now I have the php-cgi processes taking up about 43.6% of the server's RAM: most often 2 processes use 16.5% of the RAM each, 4 processes use 1.8% of the RAM each, and 4 more processes use 0,8% of the RAM, each How can I have less of these processes ? I'm almost sure they're not all needed for the trafic this server gets... I tried only allowing 2 children, but I still have those 10... This is my fastcgi.server section in lighttpd.conf. fastcgi.server = ( ".php" => ( "localhost" => ( "socket" => "/var/run/lighttpd/php-fastcgi.socket", "bin-path" => "/usr/bin/php-cgi", "bin-environment" => ( "PHP_FCGI_CHILDREN" => "2", "PHP_FCGI_MAX_REQUESTS" => "4000" ) ) ) ) What else can I do to tune lighttpd to use less RAM ?

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  • Where does netstat get the process name?

    - by tjameson
    I am developing a node application and there is an option to set the process title (process name). This only sets it in some tools (like ps and top), but not in htop or netstat. I found this article that explained how most applications do it, but it doesn't change in netstat. That lead me to wonder where those programs are getting the process name. Would they be getting it from /proc/##/cmdline? (## being the PID of the process) I figure messing with things in /proc is a bad idea (and probably not possible), so if this is where those programs are getting it, is there a way to change it?

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  • Can a Windows process continue between sessions?

    - by sofakng
    I'd like to start a process when the PC starts up but before the user logs in. Then, after the user logs in they see the console/gui for already running process. If they logoff, the process will continue to run in the background until they log back in again. Is this possible in Windows Server 2008 R2? It seems perfect for daemon/server applications.

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  • /proc/pid/environ missing variables

    - by Josh Arenberg
    google is giving no love on this one today, so I turn to the experts... I'm currently hacking together a script that relies on the /proc/pid/environ feature in Linux (RHEL 4) to check for a particular environment variable. Trouble is, it seems certain environment variables aren't showing up in there for some reason. Example: create some test vars: $ export T_1=testval TEST_1=testval T=testval TESTING_LONGEST=testval open a subshell: $bash $ cat /proc/self/environ|tr "\0" "\n"|grep testval TESTVARIABLE_LONGEST=testval T=testval hmm... where did T_1 and TEST_1 go?? what rules govern this strange universe? Thanks in advance, Josh

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  • Finding Network Status of specific process name

    - by Moev4
    I am looking for the cleanest way on linux to find the port status for a port being used by a specified program name via the command line. I have seen that netstat -p lists all pids but haven't seen anything corresponding to specific process names. Any help would be appreciated.

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  • No Firefox UI if launched during boot-up

    - by kpax
    At work I'm using Windows XP SP2. What I've noticed is if I launch Firefox while Windows hasn't finished booting up, it launches the firefox.exe process but fails to launch the associated UI i.e. there's no Firefox window at the end of it. The only way to resolve this is to kill the firefox.exe process and re-launch Firefox. Has anyone else experienced this kind of behavior? Update: I'm using Firefox 3.6

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  • unable to kill process / logout on windows server 2003

    - by vitalik
    My own console .net application stuck in a "ghost" stage. It just shows a window that i can't close. It doesn't show up as a process in the task manager. when i try to "find windows process" using Process Explorer (from sysinternals) it says there is no process that owns that window or something like that. The problem is that it doesn't allow me to logout or reboot the server (remotely) because logoff process keeps waiting on that window to close. shutdown /r /f also is stuck waiting for it. I can probably have somebody go an reboot the server but i'd like to know if there is a way to close that process, close that session or force logout remotely. This is windows server 2003, but i had the same issue on XP just a few days ago.

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  • Pass parameters to a script securely

    - by codeholic
    What is the best way to pass parameters to a forked script securely? E. g. passing parameters through command line operands is not secure, since someone who has an account on the host can run ps and see them. Unnamed pipe is quite secure, as far as I understand, isn't it? I mean, passing parameters to STDIN of the forked process. What about passing parameters in environment vars? Is it secure? What about passing parameters by other means I didn't mention?

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  • Continue process after closing terminal?

    - by Jakobud
    Recently, I tried to unzip a 30 gig zip file on a remote system using Putty. As the long unzipping process continued, I closed Putty, assuming that the process would just continue to run on the remote machine. When I came back later and logged back into the machine again, I realized that the process must have stopped only part way through when I closed Putty. I wasn't expecting that to happen. My question is, how do I prevent this problem? Can I somehow fire off a process in the background? Or should just setup a one time cronjob that will run the process for me?

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  • process ksoftirqd consumes permanent 15% CPU load [closed]

    - by markus
    Possible Duplicate: Anyone else experiencing high rates of Linux server crashes during a leap second day? The process ksoftirqd/0 uses permanent 15% CPU on our debian squeeze server. 4 root 20 0 0 0 0 R 15.0 0.0 850:59.17 ksoftirqd/0 I already read that this can have various reason like Full harddisk or high network traffic. In our case we do have more or less low network traffic and enough space on hard disk. How can I analyse what causes ksoftirqd/0 to use permanently 15% CPU?

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  • How to start a local server and open it in a browser from a shell script

    - by davidchambers
    I have a test suite which runs in a browser (using QUnit, though that's unimportant). The test suite requires a local server running on a particular port. Running the tests currently involves a few steps: node test/server switch to browser of choice open localhost:3000 I'd like to have a single command which starts the server then runs open localhost:3000. Ideally, the node process would remain in the foreground so it could be killed with ^C. I don't have a good understanding of subshells, so I'm not sure whether this is possible.

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  • Limiting network throughput of an already launched process ? (Linux/FreeBSD)

    - by jbdenis
    Hello everybody, is there any utility to limit the network throughput of a process after it has been launched ? Simple example: you note that a user takes all your upload bandwidth using scp and you'd like to limit the rate or decrease the priority of the transfer. I guess i could use a combination of iptables/tc or pf to achieve that, but i was wondering if there is a "one-shot" tool available (like tickle with a --pid option ^^) ? Regards, Jean-Baptiste

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  • How do I rename a process on Linux?

    - by jemfinch
    I'm using Python, for what it's worth, but will accept answers in any applicable language. I've tried writing to /proc/$pid/cmdline, but that's a readonly file. I've tried assigning a new string to sys.argv[0], but that has no perceptible impact. Are there any other possibilities? My program is executing processes via os.system (equivalent to system(3)) so a general, *NIX-based solution using an additional spawning process would be fine.

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  • What tools provide burndown charts to Bugzilla or Mylyn?

    - by Daniel Jomphe
    My team and I need to work on a project whose bugs are filed in Bugzilla, using Mylyn. Do you know of any tool or plug-in that provides scrum-inspired burndown charts to Bugzilla or Mylyn? Hopefully, this tool would be free for commercial usage, but we're not closed to commercial tools. Update: 4 hours of research allowed me to find very few free tools. Looks like bugzilla isn't popular in agile teams! And obviously, it's not the best fit.

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  • Documenting user scenarios and measuring/testing

    - by Rimian
    Please forgive me as I don't quite remember the exact terms for what I am talking about... hence my question. Recently I worked on a large Agile team where I encountered a method of defining user scenarios (much like user stories). These scenarios were a few very basic short sentences with keywords and a structure that could be understood by humans (especially project managers) and could also be coded against using some Java Framework (for verifying tests). The exact structure of this mini language used keywords like "when" and "and" or "if" which was how the framework parsed and verified the result. The purpose of this framework was to interface between management and the acceptance testing framework. So essentially management could write the tests themselves using English. The scenario went something like this: "When a user visits URL and User clicks on X Something happens (that can be measured)" Can anyone help me remember exactly what I am talking about? Many thanks

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  • Which are the Extreme Programming "core" practices?

    - by MiKo
    Recently, I began reading about agile methodologies and XP in particular. I am a bit confused, though, about what are considered the practices involved in extreme programming. More precisely: Wikipedia reports 12 practices, which I someway believe to be the "classic" ones. Both Kent Beck and Ron Jeffries indicate 13 practices (you can find the links at the bottom of wikipedia page about "Extreme Programming Practices", I cannot post them here since I am new user of Stack Overflow), while this review of Kent Beck's "XP explained" (2nd edition) report more than 20 somewhat different practices. As a complete beginner in the topic (and basically as a complete beginner as a programmer), I would like to be enlightened on the matter. My impression is that I should look at Beck's book, since the second edition has been written after several years of XPerience, but I can find a lot less material based on that.

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