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One SPID - Split into 127?
One SPID - Split into 127?
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curious_sqldba
curious_sqldba
Posted Monday, January 28, 2013 1:44 PM
Ten Centuries
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Last Login: Wednesday, May 22, 2013 4:13 PM
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My query is paralleled , when i query sys.sysprocesses i see 127 records for that same spid with CXPAcket wait types. There are 24 logical cores on the server, shouldn't i see only 24 records (one for each thread), why do i see 127?
Post #1412636
GilaMonster
GilaMonster
Posted Monday, January 28, 2013 3:34 PM
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Each operator in the parallel portion of the query plan can parallel up to maxdop/number of cores. They won't all be running, but they can all exist.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1412683
curious_sqldba
curious_sqldba
Posted Monday, January 28, 2013 3:41 PM
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GilaMonster (1/28/2013)
Each operator in the parallel portion of the query plan can parallel up to maxdop/number of cores. They won't all be running, but they can all exist.
I see 127 records ?
Post #1412685
GilaMonster
GilaMonster
Posted Monday, January 28, 2013 3:53 PM
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sqldba_newbie (1/28/2013)
GilaMonster (1/28/2013)
Each operator in the parallel portion of the query plan can parallel up to maxdop/number of cores. They won't all be running, but they can all exist.
I see 127 records ?
I explained why you can have so many. If there are multiple operators in the query can parallel, there can be up to maxdop threads for each operator, so 5 operators each paralleling over 24 cores would be 120 threads plus control threads. They won't all be running at the same time, but they can all exist.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1412688
curious_sqldba
curious_sqldba
Posted Monday, January 28, 2013 5:14 PM
Ten Centuries
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GilaMonster (1/28/2013)
sqldba_newbie (1/28/2013)
GilaMonster (1/28/2013)
Each operator in the parallel portion of the query plan can parallel up to maxdop/number of cores. They won't all be running, but they can all exist.
I see 127 records ?
I explained why you can have so many. If there are multiple operators in the query can parallel, there can be up to maxdop threads for each operator, so 5 operators each paralleling over 24 cores would be 120 threads plus control threads. They won't all be running at the same time, but they can all exist.
Thanks. If they are in parallel shouldn't atleast 24 of them be running?
Post #1412709
GilaMonster
GilaMonster
Posted Tuesday, January 29, 2013 1:26 AM
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sqldba_newbie (1/28/2013)
Thanks. If they are in parallel shouldn't atleast 24 of them be running?
At most 24 will be running at any one time (that's how many cores you have).
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1412801
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