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Commit98e6e89

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tidbitmap: Support shared iteration.
When a shared iterator is used, each call to tbm_shared_iterate()returns a result that has not yet been returned to any processattached to the shared iterator. In other words, each cooperatingprocesses gets a disjoint subset of the full result set, but allresults are returned exactly once.This is infrastructure for parallel bitmap heap scan.Dilip Kumar. The larger patch set of which this is a part has beenreviewed and tested by (at least) Andres Freund, Amit Khandekar,Tushar Ahuja, Rafia Sabih, Haribabu Kommi, and Thomas Munro.Discussion:http://postgr.es/m/CAFiTN-uc4=0WxRGfCzs-xfkMYcSEWUC-Fon6thkJGjkh9i=13A@mail.gmail.com
1 parentb7fa016 commit98e6e89

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8 files changed

+536
-39
lines changed

8 files changed

+536
-39
lines changed

‎doc/src/sgml/monitoring.sgml‎

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -826,7 +826,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<tbody>
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<row>
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<entry morerows="58"><literal>LWLock</></entry>
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<entry morerows="59"><literal>LWLock</></entry>
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<entry><literal>ShmemIndexLock</></entry>
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<entry>Waiting to find or allocate space in shared memory.</entry>
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</row>
@@ -1081,6 +1081,10 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<entry><literal>parallel_query_dsa</></entry>
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<entry>Waiting for parallel query dynamic shared memory allocation lock.</entry>
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</row>
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<row>
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<entry><literal>tbm</></entry>
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<entry>Waiting for TBM shared iterator lock.</entry>
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</row>
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<row>
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<entry morerows="9"><literal>Lock</></entry>
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<entry><literal>relation</></entry>

‎src/backend/access/gin/ginget.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -120,7 +120,7 @@ collectMatchBitmap(GinBtreeData *btree, GinBtreeStack *stack,
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Form_pg_attributeattr;
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/* Initialize empty bitmap result */
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scanEntry->matchBitmap=tbm_create(work_mem*1024L);
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scanEntry->matchBitmap=tbm_create(work_mem*1024L,NULL);
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/* Null query cannot partial-match anything */
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if (scanEntry->isPartialMatch&&

‎src/backend/executor/nodeBitmapIndexscan.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -78,7 +78,7 @@ MultiExecBitmapIndexScan(BitmapIndexScanState *node)
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else
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{
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/* XXX should we use less than work_mem for this? */
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tbm=tbm_create(work_mem*1024L);
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tbm=tbm_create(work_mem*1024L,NULL);
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}
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/*

‎src/backend/executor/nodeBitmapOr.c‎

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Original file line numberDiff line numberDiff line change
@@ -129,7 +129,7 @@ MultiExecBitmapOr(BitmapOrState *node)
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if (result==NULL)/* first subplan */
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{
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/* XXX should we use less than work_mem for this? */
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result=tbm_create(work_mem*1024L);
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result=tbm_create(work_mem*1024L,NULL);
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}
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((BitmapIndexScanState*)subnode)->biss_result=result;

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