11-12-2008
Think carefully about what sort of problems you want to solve, e.g.
parallel computation or task farming?
If the former, then are the communications latency-bound or bandwidth-bound? Are collective communications important? Will you need full switching for remote comms, or just nearest-neighbour?
CPU-bound or memory-bound or IO-bound?
These factors are not necessarily mutually exclusive and Inevitably there are trade-offs, but one size does not fit all.
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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)