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Improve HJDEBUG code a bit.

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Commit 30d7ae3c76d2de144232ae6ab328ca86b70e72c3 introduced an HJDEBUG
stanza that probably didn't compile at the time, and definitely doesn't
compile now, because it refers to a nonexistent variable.  It doesn't seem
terribly useful anyway, so just get rid of it.

While I'm fooling with it, use %z modifier instead of the obsolete hack of
casting size_t to unsigned long, and include the HashJoinTable's address in
each printout so that it's possible to distinguish the activities of
multiple hashjoins occurring in one query.

Noted while trying to use HJDEBUG to investigate bug #13908.  Back-patch
to 9.5, because code that doesn't compile is certainly not very helpful.
This commit is contained in:
Tom Lane 2016-02-06 15:05:23 -05:00
parent 392998bc58
commit be11f8400d
1 changed files with 13 additions and 16 deletions
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29
src/backend/executor/nodeHash.c
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@ -267,10 +267,6 @@ ExecHashTableCreate(Hash *node, List *hashOperators, bool keepNulls)
OidIsValid(node->skewTable),
&nbuckets, &nbatch, &num_skew_mcvs);
#ifdef HJDEBUG
printf("nbatch = %d, nbuckets = %d\n", nbatch, nbuckets);
#endif
/* nbuckets must be a power of 2 */
log2_nbuckets = my_log2(nbuckets);
Assert(nbuckets == (1 << log2_nbuckets));
@ -311,6 +307,11 @@ ExecHashTableCreate(Hash *node, List *hashOperators, bool keepNulls)
hashtable->spaceAllowed * SKEW_WORK_MEM_PERCENT / 100;
hashtable->chunks = NULL;
#ifdef HJDEBUG
printf("Hashjoin %p: initial nbatch = %d, nbuckets = %d\n",
hashtable, nbatch, nbuckets);
#endif
/*
* Get info about the hash functions to be used for each hash key. Also
* remember whether the join operators are strict.
@ -615,8 +616,8 @@ ExecHashIncreaseNumBatches(HashJoinTable hashtable)
Assert(nbatch > 1);
#ifdef HJDEBUG
printf("Increasing nbatch to %d because space = %lu\n",
nbatch, (unsigned long) hashtable->spaceUsed);
printf("Hashjoin %p: increasing nbatch to %d because space = %zu\n",
hashtable, nbatch, hashtable->spaceUsed);
#endif
oldcxt = MemoryContextSwitchTo(hashtable->hashCxt);
@ -731,8 +732,8 @@ ExecHashIncreaseNumBatches(HashJoinTable hashtable)
}
#ifdef HJDEBUG
printf("Freed %ld of %ld tuples, space now %lu\n",
nfreed, ninmemory, (unsigned long) hashtable->spaceUsed);
printf("Hashjoin %p: freed %ld of %ld tuples, space now %zu\n",
hashtable, nfreed, ninmemory, hashtable->spaceUsed);
#endif
/*
@ -747,7 +748,8 @@ ExecHashIncreaseNumBatches(HashJoinTable hashtable)
{
hashtable->growEnabled = false;
#ifdef HJDEBUG
printf("Disabling further increase of nbatch\n");
printf("Hashjoin %p: disabling further increase of nbatch\n",
hashtable);
#endif
}
}
@ -767,8 +769,8 @@ ExecHashIncreaseNumBuckets(HashJoinTable hashtable)
return;
#ifdef HJDEBUG
printf("Increasing nbuckets %d => %d\n",
hashtable->nbuckets, hashtable->nbuckets_optimal);
printf("Hashjoin %p: increasing nbuckets %d => %d\n",
hashtable, hashtable->nbuckets, hashtable->nbuckets_optimal);
#endif
hashtable->nbuckets = hashtable->nbuckets_optimal;
@ -814,11 +816,6 @@ ExecHashIncreaseNumBuckets(HashJoinTable hashtable)
HJTUPLE_MINTUPLE(hashTuple)->t_len);
}
}
#ifdef HJDEBUG
printf("Nbuckets increased to %d, average items per bucket %.1f\n",
hashtable->nbuckets, batchTuples / hashtable->nbuckets);
#endif
}