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AIX
Vmstat fault section all values are 0
Post 302770791 by DGPickett on Monday 18th of February 2013 11:21:26 AM
02-18-2013
As I recall, vmstat needs some help to see all your disks and such. The default set may be a subset.
Zombies are more specifically caused when the parent is not honoring SIGCHLD, so the notification at the bitter end of child life cannot be passed. The rcp/rsh family was famous for this. I guess paranoid programmers block signals rather than accept one of the default handlers. Interactive shells can have a sort of zombie when background processes stop for terminal i/o or termination notification. Check out the PPID, any shared tty processes of the zombies to see if there is a pattern to them. They take up a process slot but do not have a lot of overhead, so do not get OCD about them when you have bigger fish to fry to fix your slow system.
I have seen systems crawl for desperate lack of swap space, but with all those zeros, swap seems out fo the picture. Check, though!
Is this Oracle slowness or shell ?
Zombies are more specifically caused when the parent is not honoring SIGCHLD, so the notification at the bitter end of child life cannot be passed. The rcp/rsh family was famous for this. I guess paranoid programmers block signals rather than accept one of the default handlers. Interactive shells can have a sort of zombie when background processes stop for terminal i/o or termination notification. Check out the PPID, any shared tty processes of the zombies to see if there is a pattern to them. They take up a process slot but do not have a lot of overhead, so do not get OCD about them when you have bigger fish to fry to fix your slow system.
I have seen systems crawl for desperate lack of swap space, but with all those zeros, swap seems out fo the picture. Check, though!
Is this Oracle slowness or shell ?
Last edited by DGPickett; 02-20-2013 at 01:40 PM..
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LEARN ABOUT CENTOS
pmdapostgresql
PMDAPOSTGRESQL(1) Performance Co-Pilot PMDAPOSTGRESQL(1) NAME
pmdapostgresql - PostgreSQL database PMDA DESCRIPTION
pmdapostgresql is a Performance Co-Pilot PMDA which extracts live performance data from a running PostgreSQL database. INSTALLATION
pmdapostgresql uses a configuration file from (in this order): o /etc/pcpdbi.conf o $PCP_PMDAS_DIR/postgresql/postgresql.conf This file can contain overridden values (Perl code) for the settings listed at the start of pmdapostgresql.pl, namely: o database name (see DBI(3) for details) o database username Once this is setup, you can access the names and values for the postgresql performance metrics by doing the following as root: # cd $PCP_PMDAS_DIR/postgresql # ./Install If you want to undo the installation, do the following as root: # cd $PCP_PMDAS_DIR/postgresql # ./Remove pmdapostgresql 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
/etc/pcpdbi.conf configuration file for all PCP database monitors $PCP_PMDAS_DIR/postgresql/postgresql.conf configuration file for pmdapostgresql $PCP_PMDAS_DIR/postgresql/Install installation script for the pmdapostgresql agent $PCP_PMDAS_DIR/postgresql/Remove undo installation script for the pmdapostgresql agent $PCP_LOG_DIR/pmcd/postgresql.log default log file for error messages from pmdapostgresql SEE ALSO
pmcd(1), pmdadbping.pl(1) and DBI(3). 3.8.10 Performance Co-Pilot PMDAPOSTGRESQL(1)