Question

我使用Raspberry Pi（256MB版本）来监控室外温度并检测棚屋内的移动。要完成这项工作有三件事要做：

一个ruby脚本，每分钟运行一次并记录每分钟的温度。根据当前时间的不同，它还会将温度上传到3种不同的网络服务（每小时5,10,15分钟等）并推文（小时）
一个长时间运行的Ruby脚本，它在重启时运行并监视由运动检测软件创建的文件，然后将它们上传到Dropbox
Motion - 动作检测软件

脚本在root用户crontab中启动，如下所示：

* * * * * /usr/local/rvm/rubies/ruby-2.0.0-p353/bin/ruby /usr/share/shed_watcher/lib/shed_watcher.rb >> /tmp/cron_shed_watcher.log 2>&1
@reboot /usr/local/rvm/rubies/ruby-2.0.0-p353/bin/ruby /usr/share/shed_watcher/lib/file_monitor.rb >> /tmp/file_monitor.log 2>&1

我最近注意到，在检测到运动的几秒钟内，Pi变得无响应，重启后cron_shed_watcher.log日志文件包含以下条目：

    2014-04-03T19:55:17:342 - RAM USAGE: 28460K: stored temperatures are ["8.625\n", "8.625\n", "8.625\n", "8.625\n", "8.625\n"]

2014-04-03T19:55:17:332 - RAM USAGE: 28460K: temperature is 8.625

2014-04-03T19:55:17:376 - RAM USAGE: 28460K: average temperature is: 8.625



2014-04-03T20:00:28:812 - RAM USAGE: 28456K: temperature is 8.562

2014-04-03T20:00:28:843 - RAM USAGE: 28460K: average temperature is: 8.587

2014-04-03T20:00:28:822 - RAM USAGE: 28460K: stored temperatures are ["8.562\n", "8.625\n", "8.625\n", "8.562\n", "8.562\n"]



2014-04-03T20:05:17:312 - RAM USAGE: 28460K: temperature is 8.5

2014-04-03T20:05:17:322 - RAM USAGE: 28460K: stored temperatures are ["8.562\n", "8.562\n", "8.562\n", "8.5\n", "8.5\n"]

2014-04-03T20:05:17:346 - RAM USAGE: 28460K: average temperature is: 8.537


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要从Killed阶段发生的任何事情中恢复，我需要重新启动。我不清楚Killed日志条目的来源。我怀疑存在内存不足问题，因此日志条目中的RAM信息，但这似乎保持稳定。我还怀疑文件监视器Ruby脚本更可能是任何内存问题的罪魁祸首，因此我将每个脚本写入不同的日志文件。但是，Killed日志条目显示在温度脚本（cron_shed_watcher.log）中，而不是文件监视器日志文件中。

这是shed_watcher.rb Ruby脚本（编辑以删除不必要的细节）：

        now = DateTime.now
        shed_temp = Temperature.new
        temp = shed_temp.celcius

            #tweet & email###
            if now.min == 0
                Tweeter.tweet TimeUtils.get_now_as_string(TimeUtils.get_local_time(now)), ave_temp.round(1)

                if now.hour == 6
                    GMailer.email_graph :daily, now
                    if now.sunday?
                        GMailer.email_graph :weekly, now
                    end
                    if now.day == 1
                        GMailer.email_graph :monthly, now
                    end
                    if now.month == 1 && now.day == 1
                        GMailer.email_graph :yearly, now
                    end
                end
            end

            #Xively###
#create json for Xively web service 

            #Met Office############## --- 
#create url for Met Officeweb service 

            #open sen.se###
#create json for Open Sense web service

            #post to web###
            begin
                Exception => e
                Logger.log "RestClient raised exception:"
                Logger.log e.message
            end
        end

以下是温度等级，它从硬件中获取温度：

class Temperature
    attr_reader :celcius, :fahrenheit
    def initialize
        @celcius = -999
        @fahrenheit = -999

        `modprobe w1-gpio`
        `modprobe w1-therm`

        base_dir = '/sys/bus/w1/devices/'
        device_folder = Dir.glob(base_dir + '28*')[0]
        @device_file = device_folder + '/w1_slave'

        read_temp
    end
end

def read_temp_raw
    File.open(@device_file, 'r') do |f|
        lines = f.readlines()
    end
end

def read_temp
    lines = read_temp_raw()
    temp_c = 0
    temp_f = 0
    while !lines[0].strip().end_with? 'YES'
        sleep(0.2)
        lines = read_temp_raw
    end
    equals_pos = lines[1].rindex('=')
    if equals_pos != -1
        line=lines[1].strip
        line=line[line.index('=') + 1, line.length - line.index('=') + 1]
        temp_c = line.to_f / 1000.0
        temp_f = temp_c * 9.0 / 5.0 + 32.0
        @celcius = temp_c
        @fahrenheit = temp_f
    end
end

如您所见，此类进行了一些Linux系统调用：modprobe w1-gpio和modprobe w1-therm

file_monitor.rb脚本（在重启时运行）如下所示：

class FileWatcher

    def initialize
        client = DropboxClient.new(ACCESS_TOKEN)
        begin
            FSSM.monitor('/tmp/motion/', '**/*', :directories => true) do
                update do |base, relative|
                end
                delete do |base, relative|
                end
                create do |base, relative|
                    Logger.log "Create called with #{relative}"
                    now = DateTime.now

                    Logger.log "Uploading #{File.absolute_path(relative, base)} to dropbox then deleting"
                    begin
                        client.put_file(relative, File.new(File.absolute_path(relative, base)))
                        File.delete(File.absolute_path(relative, base))
                    rescue Exception => e
                        Logger.log "Dropbox upload raised exception:"
                        Logger.log e.message
                        File.open('files_to_process.txt', 'a') do | file |
                            file.puts File.absolute_path(relative, base)
                        end
                    end
                end
            end
        rescue Exception => e
            Logger.log "FileWatcher raised exception:"
            Logger.log e.message
        end
    end
end

fw = FileWatcher.new

如果检测到动作，则会在/tmp/motion/中创建每秒约一个jpg文件。

如何查找这些日志条目和设备死亡的原因？

为什么在Raspberry Pi上运行的Ruby脚本会死掉？

0 个答案: