XHProf: Hierarchical Profiler Report

Diff Report: Run #519ff7de62889: XHProf Run (Namespace=drupal-perf-drupalcon)
vs.
Run #519ff693b4ca2: XHProf Run (Namespace=drupal-perf-drupalcon)
Tip: Click a function name below to drill down.

Drupal\Core\Cache\DatabaseBackend::checksumTags	Run #519ff7de62889	Run #519ff693b4ca2	Diff	Diff%
Number of Function Calls	80	80	0	0.0%
Incl. Wall Time (microsec)	4,408	4,340	-68	-1.5%
Incl. Wall Time (microsec) per call	55	54	-1	-1.5%
Excl. Wall Time (microsec)	1,537	1,514	-23	-1.5%
Incl. CPU (microsecs)	4,283	4,207	-76	-1.8%
Incl. CPU (microsecs) per call	54	53	-1	-1.8%
Excl. CPU (microsec)	1,319	1,266	-53	-4.0%
Incl. MemUse (bytes)	59,760	59,760	0	0.0%
Incl. MemUse (bytes) per call	747	747	0	0.0%
Excl. MemUse (bytes)	-76,960	-76,976	-16	-0.0%
Incl. PeakMemUse (bytes)	59,720	59,464	-256	-0.4%
Incl. PeakMemUse (bytes) per call	747	743	-3	-0.4%
Excl. PeakMemUse (bytes)	12,912	12,808	-104	-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	0	N/A%	-68	-6.0%	-76	-6.5%	0	0.0%	-256	-0.4%
Exclusive Metrics Diff for Current Function			-23	-33.8%	-53	-69.7%	-16	N/A%	-104	-40.6%
*Parent functions*
Drupal\Core\Cache\DatabaseBackend::prepareItem	0	N/A%	-72	-105.9%	-77	-101.3%	0	N/A%	-256	-100.0%
Drupal\Core\Cache\DatabaseBackend::prepareItem@1	0	N/A%	4	5.9%	1	1.3%	0	N/A%	0	0.0%
*Child functions*
Drupal\Core\Database\Connection::query	0	N/A%	-25	-36.8%	-8	-10.5%	0	N/A%	-80	-31.2%
array_keys	0	N/A%	-18	-26.5%	-15	-19.7%	16	N/A%	0	0.0%
drupal_static	0	N/A%	-11	-16.2%	-6	-7.9%	0	N/A%	0	0.0%
array_diff	0	N/A%	7	10.3%	6	7.9%	0	N/A%	-72	-28.1%
Drupal\Core\Database\Statement::fetchAllAssoc	0	N/A%	2	2.9%	2	2.6%	0	N/A%	0	0.0%
array_fill_keys	0	N/A%	0	0.0%	-2	-2.6%	0	N/A%	0	0.0%