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体验新版 GitCode,发现更多精彩内容 >>
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cf8e7b16
编写于
3月 07, 2016
作者:
T
Tom Lane
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差异文件
Spell "parallel" correctly.
Per David Rowley.
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src/backend/optimizer/README
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src/backend/optimizer/path/costsize.c
src/backend/optimizer/path/costsize.c
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src/backend/optimizer/README
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@@ -938,7 +938,7 @@ often very limited due to the difficulty of avoiding pipeline stalls.
Consequently, we do not currently attempt to generate query plans that
use this technique.
Instead, we focus on partitioning paral
el
lism, which does not require
Instead, we focus on partitioning paral
le
lism, which does not require
that the underlying table be partitioned. It only requires that (1)
there is some method of dividing the data from at least one of the base
tables involved in the relation across multiple processes, (2) allowing
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src/backend/optimizer/path/costsize.c
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@@ -238,7 +238,7 @@ cost_seqscan(Path *path, PlannerInfo *root,
* only one worker, the leader often makes a very substantial
* contribution to executing the parallel portion of the plan, but as
* more workers are added, it does less and less, because it's busy
* reading tuples from the workers and doing whatever non-paral
el
l
* reading tuples from the workers and doing whatever non-paral
le
l
* post-processing is needed. By the time we reach 4 workers, the
* leader no longer makes a meaningful contribution. Thus, for now,
* estimate that the leader spends 30% of its time servicing each
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