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A really quick howto.

Edit examples/dbt2_profile and follow the notes for the DBT2PGDATA
and DBDATA directory. DBT2PGDATA is where the database directory will
be created and DBDATA is where the database table data will be

Create a 1 warehouse database by running bin/pgsql/dbt2-pgsql-build-db
and put the data files in '/tmp/data':

dbt2-pgsql-build-db -w 1

Flag description:
-d <dir> - Location for data files to load.
-w # - Set the warehouse scale factor.

Additional flags:
-h - Help.
-H <hostname> - Database system address in multi-tier system config.
-r - Drop the database before loading, for rebuilding the
-t - Use tablespaces, read tablespace notes below.

Run a 5 minute (300 second) test by running dbt2-run-workload:
dbt2-run-workload -a pgsql -d 300 -w 1 -o /tmp/result -c 10

Flag description:
-a <db> - Select database management system to test.
-c # - Set the number of database connections.
-d # - Duration of steady state portion of test in seconds.
-o <dir> - Directory to save results.
-w # - Specify the warehouse scale factor.

Additional flags:
-h - Help.
-p - Collect oprofile data.

Tablespace Notes

The scripts assumes a specific tablespace layout.

The ${DBT2TSDIR} variable in dbt2_profile defines the directory where all
tablespace devices will be mounted. Directories or symlinks can be substituted
for what is assumed to be a mount point from this point forward.

In is where the tablespaces are created.

The mount points that need to be created, and must be owned by the user running
the scripts are:

A (slightly less) quick howto run the test (Thanks Min!):

small db 2 warehouse;
big db 20 warehouse,
tiny db 500 warehouse (scaling other factors)

generated from: (tpcc only allow scaling warehouse)
mkdir DB.small
dbt2-datagen --pgsql -w 2 -d DB.small -c 300 -i 10000 -o 300 -n 90
mkdir DB.big
dbt2-datagen --pgsql -w 20 -d DB.big -c 300 -i 10000 -o 300 -n 90

scaling the other factor

mkdir DB.tiny
dbt2-datagen --pgsql -w 500 -d DB.tiny -c 3 -i 10 -o 3 -n 9

You can get # of warehouse from psql: select count(*) from warehouse;

Then load database data using, make sure DBDATA variable
is pointing to the correct directory you just generated above.

Then run "client" program manually,
you can monitor the query queue length by type "status" command.

cd <dbt2_home>/bin/pgsql
dbt2-client -d localhost -c 2 -l 5432 -o ../output/0

Then run "driver" program manually,
you can control tpw (terminal per warehouse) and think time etc.

dbt2-src/driver -d localhost -l 360 -wmin 1 -wmax 20 -w 20 \
-c 3 -i 10 -o 3 -n 9 \
-ktd 0 -ktn 0 -kto 0 -ktp 0 -kts 0 \
-ttd 0 -ttn 0 -tto 0 -ttp 0 -tts 0 -tpw 80 -outdir ../output/0

Finally, look in ../output/0 directory for the possible error output


  1. If you have fsync on then the daemon will be waiting for disk I/O
    for writing log (WAL)
  2. For 1 warehouse, increase currency hurt per cpu utilization.
    1 daemon 1 terminal: 12% in 8 way system
    2 daemon 2 terminal: 9.2%
    3 daemon 3 terminal: 6.7%
    4 daemon 4 terminal: 5.5%

    Note the tpc-c model: company scales with # of warehouses;
    each warehouse supports 10 districts;
    each district serves 3000 customers;
    each warehouse maintains stock level of 100,000 items;
    require ~10% orders are fulfilled from other warehouses due to not have
    all items in the company's catalog;

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