Changeset: bd610b1f7e24 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/bd610b1f7e24
Modified Files:
monetdb5/optimizer/opt_mitosis.c
Branch: Sep2022
Log Message:
small change to mitosis partitioning
diffs (14 lines):
diff --git a/monetdb5/optimizer/opt_mitosis.c b/monetdb5/optimizer/opt_mitosis.c
--- a/monetdb5/optimizer/opt_mitosis.c
+++ b/monetdb5/optimizer/opt_mitosis.c
@@ -181,7 +181,9 @@ OPTmitosisImplementation(Client cntxt, M
/* the number of pieces affects SF-100, going beyond 8x
increases
* the optimizer costs beyond the execution time
*/
- pieces = threads * ((int) ceil((double)rowcnt / m));
+ pieces = ((int) ceil((double)rowcnt / m / threads));
+ if (pieces <= threads)
+ pieces = threads;
} else if (rowcnt > MINPARTCNT) {
/* exploit parallelism, but ensure minimal partition size to
* limit overhead */
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