Sponsored Content
Operating Systems Linux Help pinpointing high HTTPD CPU usage in TOP Post 302265284 by reborg on Saturday 6th of December 2008 11:37:47 AM
Old 12-06-2008
In addition the advice from csorhand and looking at your processes it appears that you are using a LAMP configuration, so there are several things to take into account here (I am assuming the php part).

1. Examine your content, if you are serving pages that contain mixed content such as images and javascript along with dynamic php content, you might benefit from adding expiry to the static content, if client need to download less that will reduce some of your load.
Code:
        <IfModule mod_expires.c>
                ExpiresActive On
                <FilesMatch "\.(css|js|gif|jpg|jpeg|png|swf)$">
                        ExpiresDefault A2592000
                        Header Append Cache-Control "public"
                </FilesMatch>
        </IfModule>

2. Install a php cache such as xcache, eAccelerator or APC.

3. Look at this thread https://www.unix.com/web-programming-...primer-sh.html and use the tools linked to check your mysql configuration. I believe it is actually your communication with MySQL which is causing you the most problems.

4. Ensure that you have dns lookups turned off in apache:
Code:
HostnameLookups Off


Also check for "bad" pages that have nasty queries. We has on module on this site that put millions of rows in one db table, and tried to query that table every time specific pages were loaded. The server was running flat out for a few days until I managed to spot the strange behavior and truncated the table. The load went down instantly to a normal level.
 

10 More Discussions You Might Find Interesting

1. Red Hat

CPU usage: PS versus TOP - Different output

CPU usage: PS versus TOP - Different output Hi When monitoring a Linux environment with PS command, reported CPU value for a certain process differs, sometimes greatly, from the value seen in TOP. I understood this is not a bug, they report different data. I can't understand the nature... (4 Replies)
Discussion started by: liav
4 Replies

2. Ubuntu

High System CPU Usage

I am running a Dell PE R815 with 4 x AMD 12 core CPUs with 128GB of RAM and a RAID 5 array of 6 SAS disks. This is an HPC application and is definitely CPU bound, however once I run 16 of these processes (thus pinning 16 cores) the work performed slows down dramatically, to maybe 5 or 10% of what... (2 Replies)
Discussion started by: mowmentous
2 Replies

3. AIX

Script to identify high CPU usage processes

Hi Guys, I need to write a script capable of identifying when a high cpu utilitzation process. It sounds simple but we are on a AIX 5.3 environment with Virtual CPU's (VP's) and logical CPU's. Please any ideas or tips would be highly appreciated. Thanks. Harby. (6 Replies)
Discussion started by: arizah
6 Replies

4. AIX

HELP!!! high CPU usage with ITM kuxagent

ibm tivoli monitor's kuxagent is taking up a lot of cpu usage. anybody has any idea? i attatched a screenshot. (3 Replies)
Discussion started by: curtis911
3 Replies

5. Linux

System Went panic after CPU usage high

Hi All, Yesterday my Linux server went panic and even a small command took a lot of time to run. When i monitored pl find the below output Cpu(s): 0.1%us, 98.4%sy, 0.0%ni, 1.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st the time spent on kernel mode is 98 % and also idle time is around 1.5 %...... (4 Replies)
Discussion started by: jegaraman
4 Replies

6. AIX

Wait time shows high CPU usage

Hi, I can't seem to make sense of this. My wait time is showing really high but vmstat's and topas are showing normal usage. ps aux USER PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND root 9961810 5680.7 0.0 448 384 - A Dec 16 6703072:12 wait ... (2 Replies)
Discussion started by: techy1
2 Replies

7. AIX

High CPU Usage , users affected

Dear All, One production Server is affected by high usage. Application is slow now. Please guide me how to solve it? NMON Report shows full cpu usage. Here im posting some server details. bash-3.2# lparstat -i Node Name : ********* Partition Name ... (6 Replies)
Discussion started by: Thala
6 Replies

8. Shell Programming and Scripting

High cpu usage

I have created one script and i have added it into cron to run after 10 mins. However I have noted that whenever that script runs, It causes CPU utilization of server to increase about 10-20 % I have rechecked script and there is no way i can make changes, Script contain only 2-3 commands. So... (4 Replies)
Discussion started by: Nakul_sh
4 Replies

9. Solaris

How can i restrict user high cpu usage?

HI In my M5000 , one of domain is having SAp installed. from today onwards we are facing some stange issue. when we start SAP application, that particular user is taking 95 % of system CP and renaming 5 % is taken by system . because of this reason application is slow. i have 4 CPU(32... (4 Replies)
Discussion started by: bentech4u
4 Replies

10. UNIX for Advanced & Expert Users

Server showing high Sys% CPU usage

Hi Fellas, Not sure how I can dig in even further but we notice that one of our DB servers is showing high Sys% CPU usage even though when I execute the following command : I can see that postgres is the only one using the CPU. So if anyone can advise me what would be the best way to... (3 Replies)
Discussion started by: arizah
3 Replies
XmDropSiteConfigureStackingOrder(library call)							    XmDropSiteConfigureStackingOrder(library call)

NAME
XmDropSiteConfigureStackingOrder -- A Drag and Drop function that reorders a stack of widgets that are registered drop sites SYNOPSIS
#include <Xm/DragDrop.h> void XmDropSiteConfigureStackingOrder( Widget widget, Widget sibling, Cardinal stack_mode); DESCRIPTION
XmDropSiteConfigureStackingOrder changes the stacking order of the drop site specified by widget. The stacking order controls the manner in which drag-under effects are clipped by overlapping siblings, regardless of whether they are active. The stack mode is relative either to the entire stack, or to another drop site within the stack. The stack order can be modified only if the drop sites are siblings in both the widget and drop site hierarchy, and the widget parent of the drop sites is registered as a composite drop site. widget Specifies the drop site to be restacked. sibling Specifies a sibling drop site for stacking operations. If specified, then widget is restacked relative to this drop site's stack position. stack_mode Specifies the new stack position for the specified widget. The values are XmABOVE and XmBELOW. If a sibling is specified, then widget is restacked as follows: XmABOVE The widget is placed just above the sibling. XmBELOW The widget is placed just below the sibling. If the sibling parameter is not specified, then widget is restacked as follows: XmABOVE The widget is placed at the top of the stack. XmBELOW The widget is placed at the bottom of the stack. For a complete definition of DropSite and its associated resources, see XmDropSite(3). RELATED
XmDropSite(3), XmDropSiteRetrieve(3), and XmDropSiteQueryStackingOrder(3). XmDropSiteConfigureStackingOrder(library call)
All times are GMT -4. The time now is 04:33 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy