Changeset: ef29c5917e97 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/ef29c5917e97
Modified Files:
monetdb5/optimizer/opt_mitosis.c
Branch: Sep2022
Log Message:
small change of the mitosis partitioning, new code seems more, how it was
intended, ie each round (using all cores) should
fit in memory.
diffs (17 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
@@ -181,11 +181,11 @@ OPTmitosisImplementation(Client cntxt, M
/* the number of pieces affects SF-100, going beyond 8x
increases
* the optimizer costs beyond the execution time
*/
- pieces = 4 * (int) ceil((double)rowcnt / m / threads);
+ pieces = threads * ((int) ceil((double)rowcnt / m));
} else if (rowcnt > MINPARTCNT) {
/* exploit parallelism, but ensure minimal partition size to
* limit overhead */
- pieces = 4 * (int) ceil(MIN((double)rowcnt /
MINPARTCNT, threads));
+ pieces = MIN((int) ceil((double)rowcnt / MINPARTCNT),
threads);
}
}
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