XHProf: Hierarchical Profiler Report

Diff Report: Run #519eb880e5974: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #519eb7a1537f7: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Cache\DatabaseBackend::checksumTags	Run #519eb880e5974	Run #519eb7a1537f7	Diff	Diff%
Number of Function Calls	119	119	0	0.0%
Incl. Wall Time (microsec)	8,555	8,774	219	2.6%
Incl. Wall Time (microsec) per call	72	74	2	2.6%
Excl. Wall Time (microsec)	2,470	2,464	-6	-0.2%
Incl. CPU (microsecs)	6,242	6,131	-111	-1.8%
Incl. CPU (microsecs) per call	52	52	-1	-1.8%
Excl. CPU (microsec)	2,143	2,146	3	0.1%
Incl. MemUse (bytes)	45,832	45,832	0	0.0%
Incl. MemUse (bytes) per call	385	385	0	0.0%
Excl. MemUse (bytes)	-56,024	-56,044	-20	-0.0%
Incl. PeakMemUse (bytes)	42,836	40,452	-2,384	-5.6%
Incl. PeakMemUse (bytes) per call	360	340	-20	-5.6%
Excl. PeakMemUse (bytes)	11,804	11,128	-676	-5.7%

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%	219	6.1%	-111	-107.8%	0	0.0%	-2,384	-1.5%
Exclusive Metrics Diff for Current Function			-6	-2.7%	3	2.7%	-20	N/A%	-676	-28.4%
*Parent functions*
Drupal\Core\Cache\DatabaseBackend::prepareItem	0	N/A%	214	97.7%	-110	-99.1%	0	N/A%	-2,384	-100.0%
Drupal\Core\Cache\DatabaseBackend::prepareItem@1	0	N/A%	5	2.3%	-1	-0.9%	0	N/A%	0	0.0%
*Child functions*
Drupal\Core\Database\Connection::query	0	N/A%	283	129.2%	-45	-40.5%	0	N/A%	-756	-31.7%
array_keys	0	N/A%	-52	-23.7%	-55	-49.5%	20	N/A%	-828	-34.7%
Drupal\Core\Database\Statement::fetchAllAssoc	0	N/A%	-15	-6.8%	-15	-13.5%	0	N/A%	0	0.0%
drupal_static	0	N/A%	11	5.0%	-11	-9.9%	0	N/A%	0	0.0%
array_diff	0	N/A%	-3	-1.4%	9	8.1%	0	N/A%	-124	-5.2%
array_fill_keys	0	N/A%	1	0.5%	3	2.7%	0	N/A%	0	0.0%