Module: Sunburst

Defined in:
lib/sunburst/version.rb,
lib/sunburst/sunburst.rb,
ext/stats/stats.c

Constant Summary collapse

VERSION = 
"0.4.1"
PAGESIZE = 
UINT2NUM(PAGESIZE)
TICKS = 
UINT2NUM(TICKS)

Class Method Summary collapse

Class Method Details

.calculate_cpu_usage(pid, sleep_time) ⇒ Object 



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# File 'lib/sunburst/sunburst.rb', line 13

def self.calculate_cpu_usage(pid, sleep_time)
	uptime_file = '/proc/uptime'.freeze

	unless File.readable?(uptime_file)
		sleep(sleep_time)
		return nil
	end

	ticks = Sunburst::TICKS
	stat = Sunburst.ps_stat(pid)
	uptime = IO.read('/proc/uptime').to_f

	if stat.empty?
		sleep(sleep_time)
		return nil
	end

	utime, stime, starttime = *stat.values_at(1, 2, 5).map(&:to_f)
	uptime *= ticks

	total_time = utime + stime
	idle1 = uptime - starttime - total_time

	sleep(sleep_time)

	stat = Sunburst.ps_stat(pid)
	uptime = IO.read('/proc/uptime').to_f
	return nil if stat.empty?

	utime2, stime2, starttime2 = *stat.values_at(1, 2, 5).map(&:to_f)
	uptime *= ticks

	total_time2 = utime2 + stime2
	idle2 = uptime - starttime2 - total_time2

	totald = idle2.+(total_time2).-(idle1 + total_time)
	cpu_u = totald.-(idle2 - idle1).fdiv(totald).abs.*(100)./(Sunburst.nprocessors)

	cpu_u > 100 ? 100.0 : cpu_u
end

.clock_monotonic ⇒ Object 



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# File 'ext/stats/stats.c', line 76

VALUE clock_monotonic(volatile VALUE obj) {
	struct timespec tv ;
	clock_gettime(CLOCK_MONOTONIC, &tv) ;
	float time = tv.tv_sec + tv.tv_nsec / 1000000000.0 ;

	return rb_float_new(time) ;
}

.get_mem(pid) ⇒ Object 



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# File 'ext/stats/stats.c', line 10

VALUE statm_memory(volatile VALUE obj, volatile VALUE pid) {
	int _pid = FIX2INT(pid) ;
	if (_pid < 0) return Qnil ;

	char _path[22] ;
	sprintf(_path, "/proc/%d/statm", _pid) ;

	FILE *f = fopen(_path, "r") ;
	if (!f) return Qnil ;

	unsigned int resident, shared ;
	char status = fscanf(f, "%*u %u %u", &resident, &shared) ;
	fclose(f) ;

	if (status != 2) return Qnil ;

	unsigned int v = resident - shared ;
	return UINT2NUM(v) ;
}

.get_stats(pid) ⇒ Object 



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# File 'lib/sunburst/sunburst.rb', line 2

def self.get_stats(pid)
	stats = Sunburst.ps_stat(pid)

	if stats.empty?
		Process.kill(9, pid)
		fail RuntimeError, 'Something horribly wrong happened! Exiting.'
	end

	stats
end

.measure(command:, time: nil, sleep_time: 0.001) ⇒ Object 



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# File 'lib/sunburst/sunburst.rb', line 54

def self.measure(command:, time: nil, sleep_time: 0.001)
	progress = block_given?

	r = {
		execution_time: nil, cpu_time: nil,
		memory: nil, max_threads: nil,
		avg_mem: nil, max_memory: nil, state: nil, last_state: nil,
		avg_cpu_usage: nil, max_cpu_usage: nil
	}

	IO.popen(command) { |x|
		time1 = Sunburst.clock_monotonic
		pid = x.pid

		t = if progress
			Thread.new { }
		else
			Thread.new { print x.readpartial(4096) until x.eof? }
		end

		cpu_usage = 0
		max_cpu_usage = 0
		cpu_usage_sum = 0
		cpu_usage_measure_count = 0

		Thread.new {
			while true
				_cpu_usage = calculate_cpu_usage(pid, 0.25)

				if _cpu_usage
					cpu_usage = "%05.2f%%".freeze % _cpu_usage
					cpu_usage_sum += _cpu_usage
					cpu_usage_measure_count += 1

					max_cpu_usage = _cpu_usage if _cpu_usage > max_cpu_usage
				else
					cpu_usage = ?X.freeze
				end

			end
		}

		last_mem = 0
		max_threads = 0
		max_mem = 0
		last_state = nil

		avg_mem = 0
		mem_measure_count = 0

		while true
			_last_mem = Sunburst.get_mem(pid)

			break if (time && Sunburst.clock_monotonic - time1 > time) || _last_mem == 0
			last_mem = _last_mem
			max_mem = last_mem if max_mem < _last_mem

			avg_mem += _last_mem
			mem_measure_count += 1

			# Get stats
			stats = get_stats(pid)
			_threads = stats[3]
			max_threads = _threads if max_threads < _threads
			last_state = stats[4]

			cpu_time = stats[1].+(stats[2]).fdiv(Sunburst::TICKS)

			if progress
				yield(
					Sunburst.clock_monotonic.-(time1),
					stats[1].+(stats[2]).fdiv(Sunburst::TICKS),
					_last_mem * Sunburst::PAGESIZE,
					_threads,
					last_state,
					cpu_usage
				)
			end

			sleep(sleep_time)
		end

		time2 = Sunburst.clock_monotonic

		# Get Stats
		stats = get_stats(pid)
		cpu_time = stats[1].+(stats[2]).fdiv(Sunburst::TICKS)

		_threads = stats[3]
		max_threads = _threads if max_threads < _threads

		_last_mem = Sunburst.get_mem(pid)
		max_mem = _last_mem if max_mem < _last_mem
		last_mem = _last_mem unless _last_mem == 0

		state = stats[4]

		t.kill
		Process.kill(9, pid)

		r[:cpu_time] = cpu_time
		r[:max_threads] = max_threads unless max_threads == 0
		r[:memory] = last_mem * Sunburst::PAGESIZE if last_mem > 0
		r[:max_memory] = max_mem * Sunburst::PAGESIZE if last_mem > 0
		r[:avg_mem] =  (avg_mem * Sunburst::PAGESIZE) / mem_measure_count if mem_measure_count > 0

		r[:execution_time] = time2.-(time1).truncate(5)
		r[:state] = state
		r[:last_state] = last_state

		r[:avg_cpu_usage] = sprintf("%05.2f%%", cpu_usage_sum / cpu_usage_measure_count) if cpu_usage_measure_count > 0
		r[:max_cpu_usage] = sprintf("%05.2f%%", max_cpu_usage) if max_cpu_usage > 0
	}

	r
end

.nprocessors ⇒ Object 



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# File 'ext/stats/stats.c', line 71

VALUE nProcessors(volatile VALUE obj) {
	int coreCount = sysconf(_SC_NPROCESSORS_CONF) ;
	return (coreCount == -1) ? Qnil : INT2NUM(coreCount) ;
}

.ps_stat(pid) ⇒ Object 



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# File 'ext/stats/stats.c', line 30

VALUE ps_stat(volatile VALUE obj, volatile VALUE pid) {
	int _pid = FIX2INT(pid) ;
	if (_pid < 0) return rb_str_new_cstr("") ;

	char _path[22] ;
	sprintf(_path, "/proc/%d/stat", _pid) ;

	FILE *f = fopen(_path, "r") ;

	if (!f) return rb_ary_new() ;

	// For this info
	// follow https://man7.org/linux/man-pages/man5/proc.5.html
	char state[1] ;
	int ppid, processor ;
	long unsigned utime, stime ;
	long num_threads ;
	long long unsigned starttime ;

	char status = fscanf(
		f, "%*llu (%*[^)]%*[)] %1s "
		"%d %*d %*d %*d %*d %*u "
		"%*lu %*lu %*lu %*lu %lu %lu "
		"%*ld %*ld %*ld %*ld %ld %*ld %ld",
		&state, &ppid, &utime, &stime, &num_threads, &starttime
	) ;

	fclose(f) ;

	if (status != 6) return rb_ary_new() ;

	return rb_ary_new_from_args(6,
		INT2NUM(ppid),
		ULONG2NUM(utime),
		ULONG2NUM(stime),
		LONG2NUM(num_threads),
		rb_str_new(state, 1),
		ULL2NUM(starttime)
	) ;
}

.total_ram ⇒ Object 



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# File 'ext/stats/stats.c', line 90

VALUE totalRAM(volatile VALUE obj) {
	struct sysinfo buf ;
	char status = sysinfo(&buf) ;

	if (status != 0) return Qnil ;

	return rb_funcall(
		ULONG2NUM(buf.totalram),
		rb_intern("*"),
		1,
		ULONG2NUM(buf.mem_unit)
	) ;
}

.win_width ⇒ Object 



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# File 'ext/stats/stats.c', line 84

VALUE winWidth(volatile VALUE obj) {
	struct winsize w ;
	ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) ;
	return INT2NUM(w.ws_col) ;
}