XHProf: Hierarchical Profiler Report

Diff Report: Run #519fe6587b366: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #519fe82fef731: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Cache\DatabaseBackend::checksumTags	Run #519fe6587b366	Run #519fe82fef731	Diff	Diff%
Number of Function Calls	60	60	0	0.0%
Incl. Wall Time (microsec)	2,383	2,212	-171	-7.2%
Incl. Wall Time (microsec) per call	40	37	-3	-7.2%
Excl. Wall Time (microsec)	635	615	-20	-3.1%
Incl. CPU (microsecs)	12,000	4,000	-8,000	-66.7%
Incl. CPU (microsecs) per call	200	67	-133	-66.7%
Excl. CPU (microsec)	8,000	4,000	-4,000	-50.0%
Incl. MemUse (bytes)	50,864	50,864	0	0.0%
Incl. MemUse (bytes) per call	848	848	0	0.0%
Excl. MemUse (bytes)	-58,064	-58,056	8	0.0%
Incl. PeakMemUse (bytes)	52,392	52,384	-8	-0.0%
Incl. PeakMemUse (bytes) per call	873	873	-0	-0.0%
Excl. PeakMemUse (bytes)	8,752	8,752	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%	-171	-4.1%	-8,000	-200.0%	0	0.0%	-8	-0.0%
Exclusive Metrics Diff for Current Function			-20	-11.7%	-4,000	-50.0%	8	N/A%	0	0.0%
*Parent functions*
Drupal\Core\Cache\DatabaseBackend::prepareItem@1	0	N/A%	-115	-67.3%	0	0.0%	0	N/A%	0	0.0%
Drupal\Core\Cache\DatabaseBackend::prepareItem	0	N/A%	-56	-32.7%	-8,000	-100.0%	0	N/A%	-8	-100.0%
*Child functions*
Drupal\Core\Database\Connection::query	0	N/A%	-135	-78.9%	0	0.0%	0	N/A%	0	0.0%
Drupal\Core\Database\Statement::fetchAllAssoc	0	N/A%	-25	-14.6%	-4,000	-50.0%	0	N/A%	0	0.0%
array_keys	0	N/A%	21	12.3%	0	0.0%	-8	N/A%	-8	-100.0%
array_diff	0	N/A%	-10	-5.8%	0	0.0%	0	N/A%	0	0.0%
drupal_static	0	N/A%	-2	-1.2%	0	0.0%	0	N/A%	0	0.0%
array_fill_keys	0	N/A%	0	0.0%	0	0.0%	0	N/A%	0	0.0%