Gugu Ncube

Author: Gugu Ncube

  • Unix Memory Management – Show top memory consumers

    —

    by

    Gugu Ncube
    in

    ps aux | awk ‘{a[$11]+=$4;}END{for(i in a)print a[i]” “i;}’| sort -k1rn | head -n 10 Sourceshttp://stackoverflow.com/questions/131303/how-to-measure-actual-memory-usage-of-an-application-or-process

  • Apache Bench – Doing ab Performance Tests The Right Way

    —

    by

    Gugu Ncube
    in , ,

    Apache Bench – 5 Minutes for realistic test – 1/10/50/100/200/300/400/500/800/1000 Concurrent Users – latency, error rate, success rate, response time # CORRECT – this does 1000 requests to the URL. No problems here. ab -n 1000 http://my-test-service.com # WRONG – this always does requests to the URL for 60 seconds. ab -t 60 http://my-test-service.com #…

  • PgAdmin UI – Show Long Text – Fix for truncated Texts

    —

    by

    Gugu Ncube
    in

    How TO Display the Full column Text in PgAdmin Menu: pgAdmin3 -> Preferences -> Query Tool -> Query Editor -> Max. characters per column Questions: Re: In PgAdmin, how can I see all of a long text field? References: https://www.postgresql.org/message-id/AANLkTikUPqgMHGPoanqjN%3DvvbiYk5Ax637bxxvaGw3Dz%40mail.gmail.com

  • uLimit – Finally fixed plus gevent install

    —

    by

    Gugu Ncube
    in

    ab -n100000 -c1000 -r http://localhost:9004/ # append /etc/security/limits.conf # for a specific user # sudo sh -c ‘printf “‘$USER’ soft nofile 1000000″ >> /etc/security/limits.conf’ # for all users sudo sh -c ‘printf ” * soft nofile 1000000 * hard nofile 1000000 * soft nproc 1000000 * hard nproc 1000000″ >> /etc/security/limits.conf’ # sudo vim /etc/security/limits.conf…

  • Python – Send Email via Google GMail and Python Script

    —

    by

    Gugu Ncube
    in ,

    import smtplib from email.mime.text import MIMEText as text def test_sendmail(): to_address ='”PersonA”<a.b@gmail.com>’ body = “This is the email body!” subject=”Hello World” sendmail(to_address, subject, body) def sendmail(to_address, subject, body): from_address='”This Is Me”<a.b@gmail.com>’ smtp_server = ‘smtp.gmail.com’ smtp_port= 587 smtp_user=”a.b@gmail.com” smtp_password=”abcdefgh” #———compose——- msg = text(body) msg[‘Subject’] = subject msg[‘From’] = from_address msg[‘To’] = to_address #———send——- server = smtplib.SMTP(smtp_server,…

  • Play Framework – Activator – Fix for IllegalArgumentException: empty text

    —

    by

    Gugu Ncube
    in

    In case of calling an Play Server via HTTPS, an strange Exception is thrown as shown below. i.e. https://localhost:9000/ Fix: just use HTTP without the S 🙂 [error] p.c.s.n.PlayDefaultUpstreamHandler – Exception caught in Netty java.lang.IllegalArgumentException: empty text at org.jboss.netty.handler.codec.http.HttpVersion.(HttpVersion.java:89) ~[netty-3.10.4.Final.jar:na] at org.jboss.netty.handler.codec.http.HttpVersion.valueOf(HttpVersion.java:62) ~[netty-3.10.4.Final.jar:na] at org.jboss.netty.handler.codec.http.HttpRequestDecoder.createMessage(HttpRequestDecoder.java:75) ~[netty-3.10.4.Final.jar:na] at org.jboss.netty.handler.codec.http.HttpMessageDecoder.decode(HttpMessageDecoder.java:191) ~[netty-3.10.4.Final.jar:na] at org.jboss.netty.handler.codec.http.HttpMessageDecoder.decode(HttpMessageDecoder.java:102) ~[netty-3.10.4.Final.jar:na] at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:500) ~[netty-3.10.4.Final.jar:na]…

  • JQuery – Alternatives and Drop-In Replacement of jQuery JavaScript Library

    —

    by

    Gugu Ncube
    in ,

    The following small javascript libraries can be used instead of and as drop-in replacements of jQuery. My favorites (based on size and/or functionality) [github file = “/sudar/MissileLauncher/blob/master/MissileLauncher.cpp”] 1. ki.js: https://github.com/dciccale/ki.js 2. minifiedjs: http://minifiedjs.com/ 3. psQuery: https://github.com/pseudosavant/psQuery 4. Zepto.js: Zepto.js 5. riloadr: riloadr References 1. http://microjs.com/

  • Mac – Fix for – ls: illegal option – usage: ls

    —

    by

    Gugu Ncube
    in ,

    a@macbook:~/$ ls ls: illegal option — – usage: ls [-ABCFGHLOPRSTUWabcdefghiklmnopqrstuwx1] [file …] Fix: Check the following files for “ls –color” alias ls=’ls -G’ ~/.bashrc, .~/bash_aliases ~/.profile a@macbook:~$ grep -Es “ls\s+–color” ~/.bash* ~/.profile /Users/a/.bash_aliases:#alias ls=’ls –color=auto’ /Users/a/.bashrc: #alias ls=’ls –color=auto’ References 1. https://superuser.com/questions/183876/how-do-i-get-ls-color-auto-to-work-on-mac-os-x 2. http://ninjasingh.blogspot.de/2012/09/ls-illegal-option.html

  • Linux – Top memory usage by process

    —

    by

    Gugu Ncube
    in , ,

    Here are a couple of commands to help find top memory wasters Process – Sorted by occupied memory(2 column) ps -e -orss=,pid=,args= | sort -nr | head|awk ‘{print $2″\t”$1/1024″\tMB\t”$3;}’ Method 2 cat /proc/meminfo |grep MemTotal echo ‘ ‘ | awk ‘{ system(“cat /proc/meminfo |grep MemTotal”) }’ totalmem=$(cat /proc/meminfo |grep MemTotal | awk ‘{print $2}’); ps…

  • Unix – Finding the Processes blocking a particular port

    —

    by

    Gugu Ncube
    in , ,

    #sudo netstat -lnptu|grep : #check what is running on port 80 sudo netstat -lnptu|grep :80