XHProf: Hierarchical Profiler Report

Diff Report: Run #519be9a13e594: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #519bea9000214: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Cache\DatabaseBackend::checksumTags	Run #519be9a13e594	Run #519bea9000214	Diff	Diff%
Number of Function Calls	103	104	1	1.0%
Incl. Wall Time (microsec)	7,716	7,909	193	2.5%
Incl. Wall Time (microsec) per call	75	76	1	1.5%
Excl. Wall Time (microsec)	2,085	2,097	12	0.6%
Incl. CPU (microsecs)	5,445	5,470	25	0.5%
Incl. CPU (microsecs) per call	53	53	-0	-0.5%
Excl. CPU (microsec)	1,818	1,853	35	1.9%
Incl. MemUse (bytes)	41,228	41,516	288	0.7%
Incl. MemUse (bytes) per call	400	399	-1	-0.3%
Excl. MemUse (bytes)	-48,516	-49,484	-968	-2.0%
Incl. PeakMemUse (bytes)	43,332	43,888	556	1.3%
Incl. PeakMemUse (bytes) per call	421	422	1	0.3%
Excl. PeakMemUse (bytes)	11,952	12,052	100	0.8%

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%	193	5.1%	25	1.1%	288	1.1%	556	2.2%
Exclusive Metrics Diff for Current Function			12	6.2%	35	140.0%	-968	-336.1%	100	18.0%
*Parent functions*
Drupal\Core\Cache\DatabaseBackend::prepareItem	1	100.0%	211	109.3%	25	100.0%	288	100.0%	556	100.0%
Drupal\Core\Cache\DatabaseBackend::prepareItem@1	0	0.0%	-18	-9.3%	0	0.0%	0	0.0%	0	0.0%
*Child functions*
Drupal\Core\Database\Connection::query	0	0.0%	144	74.6%	-36	-144.0%	0	0.0%	0	0.0%
drupal_static	1	33.3%	21	10.9%	16	64.0%	0	0.0%	0	0.0%
array_diff	1	33.3%	10	5.2%	0	0.0%	88	30.6%	0	0.0%
array_keys	1	33.3%	3	1.6%	7	28.0%	1,168	405.6%	456	82.0%
array_fill_keys	0	0.0%	3	1.6%	2	8.0%	0	0.0%	0	0.0%
Drupal\Core\Database\Statement::fetchAllAssoc	0	0.0%	0	0.0%	1	4.0%	0	0.0%	0	0.0%