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Versions: 7
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Contents
module God
module System
class Process
def initialize(pid)
@pid = pid.to_i
end
# Return true if this process is running, false otherwise
def exists?
system("kill -0 #{@pid} &> /dev/null")
end
# Memory usage in kilobytes (resident set size)
def memory
ps_int('rss')
end
# Percentage memory usage
def percent_memory
ps_float('%mem')
end
# Percentage CPU usage
def percent_cpu
ps_float('%cpu')
end
# Seconds of CPU time (accumulated cpu time, user + system)
def cpu_time
time_string_to_seconds(ps_string('time'))
end
private
def ps_int(keyword)
`ps -o #{keyword}= -p #{@pid}`.to_i
end
def ps_float(keyword)
`ps -o #{keyword}= -p #{@pid}`.to_f
end
def ps_string(keyword)
`ps -o #{keyword}= -p #{@pid}`.strip
end
def time_string_to_seconds(text)
_, minutes, seconds, useconds = *text.match(/(\d+):(\d{2}).(\d{2})/)
(minutes.to_i * 60) + seconds.to_i
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems