This is unrelated, but I have never done any serious testing, and am wondering what the user/sys results are in all these performance tests. Is user I/O time and sys CPU time?
On Sun, Sep 4, 2011 at 11:43 AM, Filip Navara <filip.nav...@gmail.com>wrote: > Updated results against current trunk: > > CPU Time: user 82.009726 sys 129.636831 > > I rerun the profiler and looked at the results. Most of them looked > sensible, but one thing still struck me. Once the new index is created > in the VDBE Sorter it gets copied back into the new Btree using a loop > with the following OPCodes: > > sqlite3VdbeAddOp2(v, OP_SorterData, iSorter, regRecord); > sqlite3VdbeAddOp3(v, OP_IdxInsert, iIdx, regRecord, 1); > sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT); > > The OPFLAG_USESEEKRESULT is no-op in this case since OP_IsUnique is > never used in the merge-sort branch of code. OP_IdxInsert always seeks > for the new Btree row in the resulting tree. Couldn't we exploit the > fact that the rows are already sorted to construct the Btree faster? > > Best regards, > Filip Navara > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
