42 lines
1.3 KiB
Ruby
42 lines
1.3 KiB
Ruby
# Setup any specified hard limit on the virtual size of the process
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if APP_CONFIG.include?('hard_memory_limit') and Process.const_defined?(:RLIMIT_AS)
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Process.setrlimit Process::RLIMIT_AS, APP_CONFIG['hard_memory_limit']*1024*1024, Process::RLIM_INFINITY
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end
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# If we're running under passenger and a soft memory limit is
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# configured then setup some rack middleware to police the limit
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if APP_CONFIG.include?('soft_memory_limit') and defined?(PhusionPassenger)
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# Define some rack middleware to police the soft memory limit
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class MemoryLimit
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def initialize(app)
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@app = app
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end
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def call(env)
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# Process this requst
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status, headers, body = @app.call(env)
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# Restart if we've hit our memory limit
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if resident_size > APP_CONFIG['soft_memory_limit']
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Process.kill("USR1", 0)
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end
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# Return the result of this request
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[status, headers, body]
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end
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private
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def resident_size
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# Read statm to get process sizes. Format is
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# Size RSS Shared Text Lib Data
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fields = File.open("/proc/self/statm") do |file|
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fields = file.gets.split(" ")
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end
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# Return resident size in megabytes
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return fields[1].to_i / 256
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end
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end
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# Install the memory limit checker
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Rails.configuration.middleware.use MemoryLimit
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end
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