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Clarify resource utilization of parallel query.

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temp_file_limit is a per-process limit, not a per-session limit across
all cooperating parallel processes; change wording accordingly, per a
suggestion from Tom Lane.

Also, document under max_parallel_workers_per_gather the fact that each
process involved in a parallel query may use as many resources as a
separate session.  Caveat emptor.

Per a complaint from Peter Geoghegan.
This commit is contained in:
Robert Haas
2016-07-07 11:18:51 -04:00
parent 62c8421e87
commit d1f822e585
3 changed files with 20 additions and 4 deletions
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2
src/backend/utils/misc/postgresql.conf.sample
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@ -138,7 +138,7 @@
# - Disk -
#temp_file_limit = -1 # limits per-session temp file space
#temp_file_limit = -1 # limits per-process temp file space
# in kB, or -1 for no limit
# - Kernel Resource Usage -