XHProf: Hierarchical Profiler Report

Diff Report: Run #51af435181b2e: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #51af3d98520b7: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Cache\DatabaseBackend::checksumTags	Run #51af435181b2e	Run #51af3d98520b7	Diff	Diff%
Number of Function Calls	55	55	0	0.0%
Incl. Wall Time (microsec)	4,220	4,003	-217	-5.1%
Incl. Wall Time (microsec) per call	77	73	-4	-5.1%
Excl. Wall Time (microsec)	903	902	-1	-0.1%
Incl. CPU (microsecs)	3,126	3,121	-5	-0.2%
Incl. CPU (microsecs) per call	57	57	-0	-0.2%
Excl. CPU (microsec)	762	773	11	1.4%
Incl. MemUse (bytes)	48,488	48,488	0	0.0%
Incl. MemUse (bytes) per call	882	882	0	0.0%
Excl. MemUse (bytes)	-74,944	-74,952	-8	-0.0%
Incl. PeakMemUse (bytes)	67,560	67,576	16	0.0%
Incl. PeakMemUse (bytes) per call	1,228	1,229	0	0.0%
Excl. PeakMemUse (bytes)	11,192	11,240	48	0.4%

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	0	N/A%	-217	-27.2%	-5	-0.5%	0	0.0%	16	0.0%
Exclusive Metrics Diff for Current Function			-1	-0.5%	11	220.0%	-8	N/A%	48	300.0%
*Parent functions*
Drupal\Core\Cache\DatabaseBackend::prepareItem	0	N/A%	-151	-69.6%	-35	-700.0%	0	N/A%	16	100.0%
Drupal\Core\Cache\DatabaseBackend::prepareItem@1	0	N/A%	-66	-30.4%	30	600.0%	0	N/A%	0	0.0%
*Child functions*
Drupal\Core\Database\Connection::query	0	N/A%	-262	-120.7%	-63	-1260.0%	0	N/A%	0	0.0%
Drupal\Core\Database\Statement::fetchAllAssoc	0	N/A%	25	11.5%	24	480.0%	0	N/A%	0	0.0%
array_diff	0	N/A%	15	6.9%	25	500.0%	0	N/A%	-32	-200.0%
drupal_static	0	N/A%	9	4.1%	6	120.0%	0	N/A%	0	0.0%
array_keys	0	N/A%	-3	-1.4%	-4	-80.0%	8	N/A%	0	0.0%
array_fill_keys	0	N/A%	0	0.0%	-4	-80.0%	0	N/A%	0	0.0%