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IDProjectCategoryView StatusLast Update
0001506XdebugUncategorizedpublic2020-03-12 16:46
Reporterbeberlei Assigned Toderick  
PrioritynormalSeverityfeatureReproducibilityhave not tried
Status closedResolutionfixed 
Product Version2.6.0beta1 
Target Version2.6.0Fixed in Version2.6.0rc1 
Summary0001506: Collect statistics about garbage collection

The PHP garbage collection doesn't expose statistical information about number of runs, efficiency, memory cleared and exact locations of code where they are triggered.

I want to port the functionality of my garbage_stats extension ( into Xdebug to provide this functionality.

It works by setting an INI setting "xdebug.gc_stats_enable=1" or calling the function "xdebug_start_gcstats([$filename]);".

Output of this process is a file written to disk by using the xdebug.gc_stats_output_dir/name options for naming or the provided filename in the function.

Currently only a non machine readable, tabular format is provided with the following data points:

  • number of objects/hashtables cleared during the garbage collection run.
  • efficiency of the GC run, specifiying a percentage of all the checked objects that where actually cleared. shouljd be high, otherwise the gc run was a waste.
  • duration: how long took the garbage collection?
  • memory before/after and % in reduction
  • function that the garbage collection was triggered during.
TagsNo tags attached.
Operating System
PHP Version7.2.0-7.2.4


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Issue History

Date Modified Username Field Change
2017-12-30 16:15 beberlei New Issue
2017-12-30 16:23 derick Status new => confirmed
2017-12-30 16:23 derick Target Version => 2.6.0
2017-12-30 16:23 derick Description Updated
2017-12-31 16:20 derick Status confirmed => closed
2017-12-31 16:20 derick Assigned To => derick
2017-12-31 16:20 derick Resolution open => fixed
2017-12-31 16:20 derick Fixed in Version => 2.6.0
2018-01-22 18:21 derick Fixed in Version 2.6.0 => 2.6.0rc1
2020-03-12 16:46 derick Category Feature/Change request => Uncategorized