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149 lines
3.8 KiB
Plaintext
149 lines
3.8 KiB
Plaintext
pgbench 1.2 README 2000/1/15 Tatsuo Ishii (t-ishii@sra.co.jp)
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o What is pgbench?
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pgbench is a simple program to run a benchmark test sort of
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"TPC-B". pgbench is a client application of PostgreSQL and runs
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with PostgreSQL only. It performs lots of small and simple
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transactions including select/update/insert operations then
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calculates number of transactions successfully completed within a
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second (transactions per second, tps). Targeting data includes a
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table with at least 100k tuples.
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Example outputs from pgbench look like:
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number of clients: 4
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number of transactions per client: 100
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number of processed transactions: 400/400
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tps = 19.875015(including connections establishing)
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tps = 20.098827(excluding connections establishing)
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Similar program called "JDBCBench" already exists, but it requires
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Java that may not be available on every platform. Moreover some
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people concerned about the overhead of Java that might lead
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inaccurate results. So I decided to write in pure C, and named
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it "pgbench."
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o features of pgbench
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- pgbench is written in C using libpq only. So it is very portable
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and easy to install.
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- pgbench can simulate concurrent connections using asynchronous
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capability of libpq. No threading is required.
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o How to install pgbench
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(1) Edit the first line in Makefile
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POSTGRESHOME = /usr/local/pgsql
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so that it points to the directory where PostgreSQL installed.
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(2) Run configure
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(3) Run make. You will see an executable file "pgbench" there.
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o How to use pgbench?
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(1) Initialize database by:
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pgbench -i <dbname>
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where <dbname> is the name of database. pgbench uses four tables
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accounts, branches, history and tellers. These tables will be
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destroyed. Be very carefully if you have tables having same
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names. Default test data contains:
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table # of tuples
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-------------------------
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branches 1
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tellers 10
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accounts 100000
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history 0
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You can increase the number of tuples by using -s option. See
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below.
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(2) Run the benchmark test
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pgbench <dbname>
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The default configuration is:
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number of clients: 1
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number of transactions per client: 10
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o options
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pgbench has number of options.
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-h hostname
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hostname where the backend is running. If this option
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is omitted, pgbench will connect to the localhost via
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Unix domain socket.
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-p port
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the port number that the backend is accepting. default is
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5432.
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-c number_of_clients
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Number of clients simulated. default is 1.
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-t number_of_transactions
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Number of transactions each client runs. default is 10.
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-s scaling_factor
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this should be used with -i (initialize) option.
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number of tuples generated will be multiple of the
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scaling factor. For example, -s 100 will imply 10M
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(10,000,000) tuples in the accounts table.
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default is 1.
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-n
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No vacuuming and cleaning the history table prior the
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test is performed.
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-v
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Do vacuuming before testing. This will take some time.
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Without both -n and -v pgbench will vacuum tellers and
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branches tables only.
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-S
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Perform select only transactions instead of TPC-B.
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-d
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debug option.
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o What is the "transaction" actually performed in pgbench?
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(1) begin;
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(2) update accounts set abalance = abalance + :delta where aid = :aid;
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(3) select abalance from accounts where aid = :aid;
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(4) update tellers set tbalance = tbalance + :delta where tid = :tid;
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(5) update branches set bbalance = bbalance + :delta where bid = :bid;
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(6) insert into history(tid,bid,aid,delta) values(:tid,:bid,:aid,:delta);
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(7) end;
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o License?
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Basically it is same as BSD license. See pgbench.c for more details.
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o History
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2000/1/15 pgbench-1.2 contributed to PostgreSQL
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* Add -v option
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1999/09/29 pgbench-1.1 released
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* Apply cygwin patches contributed by Yutaka Tanida
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* More robust when backends die
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* Add -S option (select only)
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1999/09/04 pgbench-1.0 released |