02-12-2017
Quote:
Originally Posted by
alexcol
So Could you tell me if below theories could affect Performance ?
- I run netstat command and displays more than 102 connections some of them established state, some of them time wait, etc. So the question is having many connections could affect the performance of the application?
If I killed and restart connections would be a good idea to improve performance?
- Having one or more Filesystem backups could affect Performance too ?
Many network connections
might affect performance, but right now it isn't even established if you have "many" of them. Connections in the stated of "TIME_WAITING" will not contribute to the load at all and your suggested solution of killing and restarting connections would definitely not help at all.
Running filesystem backups
could very well degrade performance but if that is the case or not we can't say.
Quote:
Originally Posted by
alexcol
T
which administrative commands can i use besides top for finding the stumbling blocks you mention and taking account the OS is obsolete ?
You might want to read
this little introduction to performance tuning i wrote. Most of the tools mentioned there should work for you and most of the concepts explained there should apply to your server.
I hope this helps.
bakunin
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LEARN ABOUT CENTOS
pmdamemcache
PMDAMEMCACHE(1) Performance Co-Pilot PMDAMEMCACHE(1)
NAME
pmdamemcache - memcache performance metrics domain agent (PMDA)
DESCRIPTION
This PMDA extracts performance data from memcached, a distributed memory caching daemon commonly used to improve web serving performance.
A farm of memcached processes over multiple servers can be utilised by a single web application, increasing the total available object
cache size, and decreasing the database load associated with smaller cache sizes. This system is described in detail at
http://www.danga.com/memcached.
INSTALLATION
Configure pmdamemcache to extract the values from set of hosts used in the memcache farm. These hosts can be listed in the
$PCP_PMDAS_DIR/memcache/memcache.conf file, in the format (i.e. Perl array) described at the top of pmdamemcache.pl. A custom refresh
rate can also be configured using this mechanism.
# cd $PCP_PMDAS_DIR/memcache
# [ edit memcache.conf ]
Once this is setup, you can access the names and values for the memcache performance metrics by doing the following as root:
# cd $PCP_PMDAS_DIR/memcache
# ./Install
If you want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/memcache
# ./Remove
pmdamemcache is launched by pmcd(1) and should never be executed directly. The Install and Remove scripts notify pmcd(1) when the agent is
installed or removed.
FILES
$PCP_PMDAS_DIR/memcache/memcache.conf
configuration file listing monitored memcache instances
$PCP_PMDAS_DIR/memcache/Install
installation script for the pmdamemcache agent
$PCP_PMDAS_DIR/memcache/Remove
undo installation script for the pmdamemcache agent
$PCP_LOG_DIR/pmcd/memcache.log
default log file for error messages from pmdamemcache
SEE ALSO
pmcd(1) and memcached(1).
3.8.10 Performance Co-Pilot PMDAMEMCACHE(1)