Thread: pgsql: Change the way latency is calculated with pgbench --rate option.
pgsql: Change the way latency is calculated with pgbench --rate option.
From
Heikki Linnakangas
Date:
Change the way latency is calculated with pgbench --rate option. The reported latency values now include the "schedule lag" time, that is, the time between the transaction's scheduled start time and the time it actually started. This relates better to a model where requests arrive at a certain rate, and we are interested in the response time to the end user or application, rather than the response time of the database itself. Also, when --rate is used, include the schedule lag time in the log output. The --rate option is new in 9.4, so backpatch to 9.4. It seems better to make this change in 9.4, while we're still in the beta period, than ship a 9.4 version that calculates the values differently than 9.5. Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/02e3bcc661598275a75a8649b48602dca7aeec79 Modified Files -------------- contrib/pgbench/pgbench.c | 164 +++++++++++++++++++++++++++++++-------------- doc/src/sgml/pgbench.sgml | 59 ++++++++-------- 2 files changed, 146 insertions(+), 77 deletions(-)