| From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
|---|---|
| To: | Gunther <raj(at)gusw(dot)net> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, pgsql-performance(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Out of Memory errors are frustrating as heck! |
| Date: | 2019-04-21 10:19:09 |
| Message-ID: | 20190421101908.GC14223@telsasoft.com |
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| Lists: | pgsql-performance |
I was able to reproduce in a somewhat contrived way:
sh -c 'ulimit -v 1024000 ; /usr/local/pgsql/bin/postgres -D ./pg12dev5 -cport=1234' &
postgres=# SET work_mem='64kB';SET client_min_messages =debug1;SET log_statement_stats=on;explain(analyze) WITH v AS MATERIALIZED (SELECT * FROM generate_series(1,9999999)i WHERE i%10<10 AND i%11<11 AND i%12<12 AND i%13<13 AND i%14<14 AND i%15<15 AND i%16<16 AND i%17<17 AND i%18<18 AND i%19<19 AND i%20<20 AND i%21<21 ) SELECT * FROM generate_series(1,99)k JOIN v ON k=i;
HashTableContext: 8192 total in 1 blocks; 7696 free (7 chunks); 496 used
hash batch files: 852065104 total in 101318 blocks; 951896 free (20 chunks); 851113208 used
HashBatchContext: 73888 total in 4 blocks; 24280 free (6 chunks); 49608 used
2019-04-21 04:11:02.521 CDT [4156] ERROR: out of memory
2019-04-21 04:11:02.521 CDT [4156] DETAIL: Failed on request of size 8264 in memory context "hash batch files".
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