End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

GC.stress=

GC.stress = flag → flag

# File tmp/rubies/ruby-3.0.5/gc.rb, line 110
def self.stress=(flag)
  Primitive.gc_stress_set_m flag
end

Updates the GC stress mode.

When stress mode is enabled, the GC is invoked at every GC opportunity: all memory and object allocations.

Enabling stress mode will degrade performance, it is only for debugging.

flag can be true, false, or an integer bit-ORed following flags.

Example

0x01:: no major GC
0x02:: no immediate sweep
0x04:: full mark after malloc/calloc/realloc

See also .stress .verify_compaction_references .stat .verify_internal_consistency also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1