XHProf: Hierarchical Profiler Report

Diff Report: Run #519ffa0e6cdec: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #519ffa6332b29: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Cache\DatabaseBackend::checksumTags	Run #519ffa0e6cdec	Run #519ffa6332b29	Diff	Diff%
Number of Function Calls	73	73	0	0.0%
Incl. Wall Time (microsec)	3,055	2,931	-124	-4.1%
Incl. Wall Time (microsec) per call	42	40	-2	-4.1%
Excl. Wall Time (microsec)	1,001	967	-34	-3.4%
Incl. CPU (microsecs)	0	8,000	8,000	N/A%
Incl. CPU (microsecs) per call	0	110	110	N/A%
Excl. CPU (microsec)	0	4,000	4,000	N/A%
Incl. MemUse (bytes)	56,352	56,344	-8	-0.0%
Incl. MemUse (bytes) per call	772	772	-0	-0.0%
Excl. MemUse (bytes)	-95,904	-95,904	0	0.0%
Incl. PeakMemUse (bytes)	95,096	95,088	-8	-0.0%
Incl. PeakMemUse (bytes) per call	1,303	1,303	-0	-0.0%
Excl. PeakMemUse (bytes)	19,104	19,104	0	0.0%

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%	-124	-5.9%	8,000	100.0%	-8	-0.0%	-8	-0.0%
Exclusive Metrics Diff for Current Function			-34	-27.4%	4,000	50.0%	0	0.0%	0	0.0%
*Parent functions*
Drupal\Core\Cache\DatabaseBackend::prepareItem	0	N/A%	-124	-100.0%	8,000	100.0%	-8	-100.0%	-8	-100.0%
Drupal\Core\Cache\DatabaseBackend::prepareItem@1	0	N/A%	0	0.0%	0	0.0%	0	0.0%	0	0.0%
*Child functions*
Drupal\Core\Database\Connection::query	0	N/A%	-61	-49.2%	4,000	50.0%	-8	-100.0%	-8	-100.0%
Drupal\Core\Database\Statement::fetchAllAssoc	0	N/A%	-33	-26.6%	0	0.0%	-8	-100.0%	-8	-100.0%
array_keys	0	N/A%	5	4.0%	0	0.0%	8	100.0%	0	0.0%
array_diff	0	N/A%	-1	-0.8%	0	0.0%	0	0.0%	8	100.0%
array_fill_keys	0	N/A%	0	0.0%	0	0.0%	0	0.0%	0	0.0%
drupal_static	0	N/A%	0	0.0%	0	0.0%	0	0.0%	0	0.0%