How It Works sp_server_diagnostics – spinlock backoffs – Business Intelligence Info

How It Works sp_server_diagnostics – spinlock backoffs – Business Intelligence Info

TherearenumerousarticlesoutlininghowspinlocksworksoIwon’tcoverthedetailsinthispost?

Instead,Iwanttofocusonthespinlockbackoffsvaluerecordedinthesp_server_diagnosticsoutput。

Component=System

spinlockBackoffs=0sickSpinlockType=nonesickSpinlockTypeAfterAv=none…

Queryingselect*fromsys。

dm_os_spinlock_statsthebackoffscolumnispresented?

ThisisNOTthesameasthespinlockBackoffspresentedinthesp_server_diagnosticsoutput。

Aspinlockbackoffisonlycountedinsp_server_diagnosticswhenthespinlockhasbeendeclaredSICK?

Sickisthetermusedtoindicatethatthecodehasattemptedtoacquirethespinlockownershipbutafter10,000sofspinsandlightweightbackoffs,forapprox。

5seconds,ownershipcouldnotbeacquired?

Atthe~5secondpointthecodeperformsamoreagressivesleepoperationbecausethespinlockappearstobedamagedorhungupinsomeway,orissick,ifyouwill。

TheXEventspinlock_backoffmapstothedm_os_spinlock_stats,backoffcolumn。

TheXEventspinlock_backoff_warningmapstothesp_server_diagnosticsoutputandisproducedwhenthespinlockisdeclaredsick。

TheSystemcomponentcanreportERRORstateoncethespinlockBackoffsreachacountof2orgreaterforthesamesickSpinlockType?

Thisindicatesthatforapprox。

10or15secondsthespinlockcouldnotacquireownership,signalingalargerissueonthesystem?

(Orphanedspinlock,CPUproblems,etc…)

BobDorrPrincipalSQLServerEscalationEngineer

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