Entire CPU ??!! Are you logging CPU based on numbers or by usage ..
In Solaris,
If by number wise - mpstat command will help you ..
If by usage wise - prstat ..
All I was doing is this.
Code:
sudo grep -ri "xprofile" /etc/* 2>/dev/null
My gui completely froze so I hit ctrl+alt+f2 to open up a new console. Then I used used top to check out what was going on. top said I was at 100% cpu usage and grep was hogging my entire cpu.
This will search every inode in directory /etc whether or not that inode is suitable for "grep". You can even find pipes under /etc .
On my system it would try to search over 8000 inodes.
As a minimum, consider limiting the list by using "find -xdev -type f" and then further checking for text files with the "file" command.
You better use find as suggested. When I forget (that happens more often) about the location of any config file or any such thing, but somehow if I remember any unique word in that file I do this:
Code:
find /etc -xdev -type f | xargs grep -i "unique_word"
This is lot faster.
@Corona688
Some directories in /etc are indeed restricted for root. This depends on what UNIX/Linux variant you are using and the installed software/packages. See below:
Code:
##for a RHEL 6.1
$ ls -ltr /etc/* 2>err
$ cat err
ls: cannot open directory /etc/sudoers.d: Permission denied
ls: cannot open directory /etc/dhcp: Permission denied
ls: cannot open directory /etc/named: Permission denied
ls: cannot open directory /etc/sssd: Permission denied
ls: cannot open directory /etc/audisp: Permission denied
ls: cannot open directory /etc/audit: Permission denied
##for a Solaris11
$ ls -ltr /etc/* 2>err
$ cat err
/etc/sudoers.d: Permission denied
##for a FreeBSD
$ ls -ltr /etc/* 2>err
$ cat err
ls: /etc/ntp: Permission denied
What if the file you are searching are in one of those directories.
Also, my RHEL 6.1 VM took 100% of CPU time of 4 allocated cores (with only 953 inodes in /etc directory):
So there's a pretty good reason why your GUI got stuck as grep has to run a loop for each inode (that includes directories as well which is absolutely meaning less in this case).
@Corona688
Some directories in /etc are indeed restricted for root.
So? He's not looking inside any directories.
Quote:
So there's a pretty good reason why your GUI got stuck as grep has to run a loop for each inode (that includes directories as well which is absolutely meaning less in this case).
So what? That doesn't hang the system. Linux is a pre-emptive kernel. If a process wastes too much time, it will be stopped so something else can go. At worst grep could've lagged the system from using 100% CPU. It wouldn't freeze it.
Back in my college days, a fellow student accidentally left behind a process which due to a bug did nothing but eat 100% CPU. Several weeks later, it was still there. Nobody noticed it until I ran 'top'. It hadn't interfered with people's use of the system at all.
Let me give you a complete example what I am trying to achieve.
1. Below is the log file structure where I need 2,5 and 14th column of the logs after grepping through the linkId=1ddoic.
Log file structure:-
abc.com 20120829001415 127.0.0.1 app none11111 sas 0 0 N clk Mozilla/5.0... (3 Replies)
As per my understanding below mentioned line of code finding a word 'boy' in $ACULOG...
num_errors=`grep -i -e fail -e illegal -e exception -e "<E" -e boy $ACULOG | wc -l`
if I'm not corerct, please correct me. How I can find entire line like "This is a boy" with something similar as above... (1 Reply)
As per my understanding below mentioned line of code finding a word 'boy' in $ACULOG...
num_errors=`grep -i -e fail -e illegal -e exception -e "<E" -e boy $ACULOG | wc -l`
if I'm not corerct, please correct me. How I can find entire line like "This is a boy" with something similar as above... (1 Reply)
Okay, I am trying to come up with a multi-platform script to report top ten CPU and memory hog processes, which will be run by our enterprise monitoring application as an auto-action item when the CPU and Memory utilization gets reported as higher than a certain threshold
I use top on other... (5 Replies)
Hi friends,
This is my very first post on forum, so kindly excuse if my doubts are found too silly.
I am trying to automate a piece of routine work and this is where I am stuck at the moment-I need to grep a particular ID through a file containing many records(which start with <LRECORD> and end... (6 Replies)
Sorry for the title, I really don't know how to word this question or what to even search for. I tried "grep one match", "grep 1 match", "stop grep" on both google and here and haven't found something that helps, so here I go:
I have a file that's about 1.5 million lines long, every line looks... (3 Replies)
I'm having problems since few days ago, and i'm not able to make it works with a simple awk+grep script (or other way to do this).
For example, i have a input file1.txt:
cat inputfile1.txt
218299910417
1172051195
1172070231
1172073514
1183135117
1183135118
1183135119
1281440202
... (3 Replies)
Hi
I would like to thank you all for this excellent forum.
Today i tried to compare two files and i get some problem with it.
I have two files and i want to get all the data that match the first file like this
File1 (pattern file)
___________________________
9007
9126
9918
9127 ... (6 Replies)
(extract from SQL binlog file...)
# at 4960
#080801 14:35:31 server id 4 end_log_pos 195 Query thread_id=63121426 exec_time=0 error_code=0
use d_jds;
SET TIMESTAMP=1217581531;
UPDATE bid_details set bidding = 3170.37 ,deduction=if((3170.37 < 37.43),0,deduction)
where... (3 Replies)
Hi,
I have one basic doubt, that using grep command frequently , will it have direct impact on the CPU load, pls clarify
for eg, if i run a non stop script containing while loop to grep some parameters, what will be the load in CPU..
thanks (3 Replies)
01-17-2012
