XHProf: Hierarchical Profiler Report

Diff Report: Run #519c03b86b1ec: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #519c04ab45451: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Cache\DatabaseBackend::checksumTags	Run #519c03b86b1ec	Run #519c04ab45451	Diff	Diff%
Number of Function Calls	115	116	1	0.9%
Incl. Wall Time (microsec)	8,029	8,502	473	5.9%
Incl. Wall Time (microsec) per call	70	73	3	5.0%
Excl. Wall Time (microsec)	2,283	2,339	56	2.5%
Incl. CPU (microsecs)	5,767	5,801	34	0.6%
Incl. CPU (microsecs) per call	50	50	-0	-0.3%
Excl. CPU (microsec)	1,968	2,016	48	2.4%
Incl. MemUse (bytes)	44,684	44,972	288	0.6%
Incl. MemUse (bytes) per call	389	388	-1	-0.2%
Excl. MemUse (bytes)	-50,452	-51,420	-968	-1.9%
Incl. PeakMemUse (bytes)	43,380	43,364	-16	-0.0%
Incl. PeakMemUse (bytes) per call	377	374	-3	-0.9%
Excl. PeakMemUse (bytes)	12,276	12,252	-24	-0.2%

Function Name	Calls Diff	Calls Diff%	Incl. Wall Diff (microsec)	IWall Diff%	Incl. CPU Diff (microsec)	ICpu Diff%	Incl. MemUse Diff (bytes)	IMemUse Diff%	Incl. PeakMemUse Diff (bytes)	IPeakMemUse Diff%
*Current Function*
Drupal\Core\Cache\DatabaseBackend::checksumTags	1	25.0%	473	75.8%	34	2.2%	288	2.3%	-16	-0.1%
Exclusive Metrics Diff for Current Function			56	11.8%	48	141.2%	-968	-336.1%	-24	-150.0%
*Parent functions*
Drupal\Core\Cache\DatabaseBackend::prepareItem	1	100.0%	388	82.0%	32	94.1%	288	100.0%	-16	-100.0%
Drupal\Core\Cache\DatabaseBackend::prepareItem@1	0	0.0%	85	18.0%	2	5.9%	0	0.0%	0	0.0%
*Child functions*
Drupal\Core\Database\Connection::query	0	0.0%	378	79.9%	-49	-144.1%	0	0.0%	0	0.0%
drupal_static	1	33.3%	28	5.9%	32	94.1%	0	0.0%	0	0.0%
array_diff	1	33.3%	13	2.7%	20	58.8%	88	30.6%	0	0.0%
array_keys	1	33.3%	-2	-0.4%	-20	-58.8%	1,168	405.6%	8	50.0%
array_fill_keys	0	0.0%	0	0.0%	0	0.0%	0	0.0%	0	0.0%
Drupal\Core\Database\Statement::fetchAllAssoc	0	0.0%	0	0.0%	3	8.8%	0	0.0%	0	0.0%