60 lines
1.8 KiB
Ruby
60 lines
1.8 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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# Chaos methods for GitLab.
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# See https://docs.gitlab.com/ee/development/chaos_endpoints.html for more details.
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class Chaos
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# leak_mem will retain the specified amount of memory and sleep.
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# On return, the memory will be released.
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def self.leak_mem(memory_mb, duration_s)
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start_time = Time.now
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retainer = []
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# Add `n` 1mb chunks of memory to the retainer array
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memory_mb.times { retainer << "x" * 1.megabyte }
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duration_left = [start_time + duration_s - Time.now, 0].max
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Kernel.sleep(duration_left)
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end
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# cpu_spin will consume all CPU on a single core for the specified duration
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def self.cpu_spin(duration_s)
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return unless Gitlab::Metrics::System.thread_cpu_time
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expected_end_time = Gitlab::Metrics::System.thread_cpu_time + duration_s
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rand while Gitlab::Metrics::System.thread_cpu_time < expected_end_time
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end
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# db_spin will query the database in a tight loop for the specified duration
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def self.db_spin(duration_s, interval_s)
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expected_end_time = Time.now + duration_s
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while Time.now < expected_end_time
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ApplicationRecord.connection.execute("SELECT 1")
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end_interval_time = Time.now + [duration_s, interval_s].min
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rand while Time.now < end_interval_time
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end
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end
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# sleep will sleep for the specified duration
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def self.sleep(duration_s)
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Kernel.sleep(duration_s)
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end
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# Kill will send the given signal to the current process.
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def self.kill(signal)
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Process.kill(signal, Process.pid)
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end
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def self.run_gc
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# Tenure any live objects from young-gen to old-gen
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4.times { GC.start(full_mark: false) }
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# Run a full mark-and-sweep collection
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GC.start
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GC.stat
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end
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end
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end
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