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Code Activity

Improved speed of optimizer trace

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- Added unlikely() to optimize for not having optimizer trace enabled
- Made THD::trace_started() inline
- Added 'if (trace_enabled())' around some potentially expensive code
  (not many found)
- Added ASSERT's to ensure we don't call expensive optimizer trace calls
  if optimizer trace is not enabled
- Added length to Json_writer functions to speed up buffer writes
  when optimizer trace is enabled.
- Changed LEX_CSTRING argument handling to not send full struct to writer
  function on_add_str() functions now trusts length arguments
This commit is contained in:
Monty
2020-03-06 10:33:11 +02:00
parent 1ad8693a6f
commit 940fcbe73b
9 changed files with 176 additions and 102 deletions
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5
sql/sql_test.cc
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@ -658,9 +658,12 @@ Memory allocated by threads: %s\n",
void print_keyuse_array_for_trace(THD *thd, DYNAMIC_ARRAY *keyuse_array)
{
DBUG_ASSERT(thd->trace_started());
Json_writer_object wrapper(thd);
Json_writer_array trace_key_uses(thd, "ref_optimizer_key_uses");
for(uint i=0; i < keyuse_array->elements; i++)
for (uint i=0; i < keyuse_array->elements; i++)
{
KEYUSE *keyuse= (KEYUSE*)dynamic_array_ptr(keyuse_array, i);
Json_writer_object keyuse_elem(thd);