Re: Large join runs out of memory in 8.1 - Mailing list pgsql-bugs
| From | Joe Sunday |
|---|---|
| Subject | Re: Large join runs out of memory in 8.1 |
| Date | |
| Msg-id | 20060315174858.GA9188@csh.rit.edu Whole thread Raw |
| In response to | Re: Large join runs out of memory in 8.1 (Tom Lane <tgl@sss.pgh.pa.us>) |
| Responses |
Re: Large join runs out of memory in 8.1
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| List | pgsql-bugs |
On Tue, Mar 14, 2006 at 11:29:57PM -0500, Tom Lane wrote: > It's not the easiest sort of problem to debug :-( ... > > What I'd try is first letting the problem case run for a bit, then > stopping it with gdb and dumping out a few Kb of the frontmost memory > block in the ExecutorState context. Sometimes, looking at the data Can you point me a little more in that direction? I can't figure out how to get a handle to that context. > that's being leaked is enough to give you a clue. If not, try setting a > breakpoint at AllocSetAlloc and trying to see where the majority of > calls are coming from. It'll be tedious ... This is the pattern I seemed to get: 3 calls here: #0 0x1021aa80 in AllocSetAlloc () #1 0x1021ba0c in MemoryContextAlloc () #2 0x1016de48 in BufFileCreateTemp () #3 0x100fcbb4 in ExecHashJoinSaveTuple () #4 0x100fbe44 in ExecHashTableInsert () #5 0x100fc858 in MultiExecHash () #6 0x100ef6d8 in MultiExecProcNode () #7 0x100fd800 in ExecHashJoin () #8 0x100ef8a8 in ExecProcNode () #9 0x100edea8 in ExecutorRun () #10 0x1018519c in ProcessQuery () #11 0x10185850 in PortalRun () #12 0x1018084c in exec_simple_query () #13 0x101825b0 in PostgresMain () #14 0x1015510c in ServerLoop () #15 0x10155d80 in PostmasterMain () #16 0x101101e8 in main () 1 call here: #0 0x1021aa80 in AllocSetAlloc () #1 0x1021bb1c in MemoryContextAllocZero () #2 0x100324d4 in heap_form_tuple () #3 0x100f5810 in ExecCopySlotTuple () #4 0x100f5c04 in ExecMaterializeSlot () #5 0x100fc848 in MultiExecHash () #6 0x100ef6d8 in MultiExecProcNode () #7 0x100fd800 in ExecHashJoin () #8 0x100ef8a8 in ExecProcNode () #9 0x100edea8 in ExecutorRun () #10 0x1018519c in ProcessQuery () #11 0x10185850 in PortalRun () #12 0x1018084c in exec_simple_query () #13 0x101825b0 in PostgresMain () #14 0x1015510c in ServerLoop () #15 0x10155d80 in PostmasterMain () #16 0x101101e8 in main () 1 call here: #0 0x1021aa80 in AllocSetAlloc () #1 0x1021ba0c in MemoryContextAlloc () #2 0x1016c530 in make_database_relative () #3 0x1016cf7c in FileNameOpenFile () #4 0x1016d02c in OpenTemporaryFile () #5 0x1016de10 in BufFileCreateTemp () #6 0x100fcbb4 in ExecHashJoinSaveTuple () #7 0x100fbe44 in ExecHashTableInsert () #8 0x100fc858 in MultiExecHash () #9 0x100ef6d8 in MultiExecProcNode () #10 0x100fd800 in ExecHashJoin () #11 0x100ef8a8 in ExecProcNode () #12 0x100edea8 in ExecutorRun () #13 0x1018519c in ProcessQuery () #14 0x10185850 in PortalRun () #15 0x1018084c in exec_simple_query () #16 0x101825b0 in PostgresMain () #17 0x1015510c in ServerLoop () #18 0x10155d80 in PostmasterMain () #19 0x101101e8 in main () Repeat. --Joe -- Joe Sunday <sunday@csh.rit.edu> http://www.csh.rit.edu/~sunday/ Computer Science House, Rochester Inst. Of Technology
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