Shantanu's Blog

Corporate Consultant

January 26, 2015

 

Memory usage report

Here is an utility to accurately report the memory usage for a program.

https://github.com/pixelb/ps_mem

ps_mem [-h|--help] [-p PID,...] [-s|--split-args] [-t|--total] [-w N]
Example output:

 Private  +   Shared  =  RAM used       Program

 34.6 MiB +   1.0 MiB =  35.7 MiB       gnome-terminal
139.8 MiB +   2.3 MiB = 142.1 MiB       firefox
291.8 MiB +   2.5 MiB = 294.3 MiB       gnome-shell
272.2 MiB +  43.9 MiB = 316.1 MiB       chrome (12)
913.9 MiB +   3.2 MiB = 917.1 MiB       thunderbird
---------------------------------
                          1.9 GiB
=================================

Labels: ,


January 25, 2015

 

comparing numbers in python

set comparison as shown below is faster than the for-loop comparison in python.

a = set(range(7045000000,7045099999))
myset=[]
with open('Output21.txt3' , 'r') as f:
    for line in f:
        myl = line[:5]
        if myl == '70450':
            myset.append(int(line.strip('\n')))
b=set(myset)      
a-b
_____

myl=[]
with open("Output21.txt3") as f:
    rd=f.readlines()
    x=[t.strip("\n") for t in rd if t[:5] == '70450']
    for i in range(7045000000,7045099999):
        if str(i) not in x:
            myl.append(i)


Labels:


January 24, 2015

 

query text files

Usually we need to import the CSV data to SQL in order to run the queries. How about running queries directly on the text file?

# git clone https://github.com/harelba/q.git

# cd q

# chmod +x ./bin/q

# ./bin/q "SELECT COUNT(1) FROM examples/exampledatafile"
248

If git is not installed, use the single file found here...

# wget -O q https://cdn.rawgit.com/harelba/q/1.5.0/bin/q?source=install_page&table=1

Interesting!

Labels: , ,


December 26, 2014

 

compares files

There is a very easy way to compare files using python.

import filecmp
dc = filecmp.dircmp('dirA', 'dirB')

Now you can find common files as well as files missing in second directory using common, left_only methods.

dc.common
dc.left_only
dc.right_only

Or simply ask for the full report.

dc.report_full_closure()

Easy and neat!

Labels: ,


December 22, 2014

 

dealing with mysql issues

While troubleshooting mysql issue, the first place to check is error log. If the error log is clean, then the next option to evaluate is slow query log

# enable slow query log
mysql> set global slow_query_log = on;

# change the default 10 seconds to 1 second
# make sure that the queries not using indexes are logged
SET GLOBAL long_query_time=1;
SET GLOBAL log_queries_not_using_indexes=1;

# If the slow log is growing too fast, feel free to again set the variables back to how they were:

SET GLOBAL long_query_time=10;
SET GLOBAL log_queries_not_using_indexes=0;

# or disable the slow query log
set global slow_query_log = off;

Labels: ,


Archives

June 2001   July 2001   January 2003   May 2003   September 2003   October 2003   December 2003   January 2004   February 2004   March 2004   April 2004   May 2004   June 2004   July 2004   August 2004   September 2004   October 2004   November 2004   December 2004   January 2005   February 2005   March 2005   April 2005   May 2005   June 2005   July 2005   August 2005   September 2005   October 2005   November 2005   December 2005   January 2006   February 2006   March 2006   April 2006   May 2006   June 2006   July 2006   August 2006   September 2006   October 2006   November 2006   December 2006   January 2007   February 2007   March 2007   April 2007   June 2007   July 2007   August 2007   September 2007   October 2007   November 2007   December 2007   January 2008   February 2008   March 2008   April 2008   July 2008   August 2008   September 2008   October 2008   November 2008   December 2008   January 2009   February 2009   March 2009   April 2009   May 2009   June 2009   July 2009   August 2009   September 2009   October 2009   November 2009   December 2009   January 2010   February 2010   March 2010   April 2010   May 2010   June 2010   July 2010   August 2010   September 2010   October 2010   November 2010   December 2010   January 2011   February 2011   March 2011   April 2011   May 2011   June 2011   July 2011   August 2011   September 2011   October 2011   November 2011   December 2011   January 2012   February 2012   March 2012   April 2012   May 2012   June 2012   July 2012   August 2012   October 2012   November 2012   December 2012   January 2013   February 2013   March 2013   April 2013   May 2013   June 2013   July 2013   September 2013   October 2013   January 2014   March 2014   April 2014   May 2014   July 2014   August 2014   September 2014   October 2014   November 2014   December 2014   January 2015  

This page is powered by Blogger. Isn't yours?