Linux 按进程名称过滤并记录 CPU 使用率
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Filter by process name and log CPU usage
提问by BalaB
Is there an option for linux top command where i can filter processes by name and write the CPU usage of that process every 1 second to a log file?
linux top命令是否有一个选项，我可以按名称过滤进程并将该进程的CPU使用率每1秒写入日志文件？
采纳答案by Shawn Chin
top& pgrep
top& pgrep
To filter the output of topby process name, you can use pgrepto get a list of PIDs by process name then pass them to the -poption of top.
要按top进程名称过滤输出，您可以使用按进程名称 pgrep获取PID列表，然后将它们传递给 的-p选项top。
For example:
例如：
top -p $(pgrep -d',' http)
Note: the -d','option delimits the PIDs with commas, which is what is expected by the top -p.
Note 2: topwill return a failure message if there are no running processes that match the name you specify in pgrep.
注意：该-d','选项用逗号分隔 PID，这是top -p. 注 2：top如果没有与您指定的名称匹配的正在运行的进程，将返回失败消息pgrep。
To write the results of topto a file, use the -n 1option (only one iteration) and redirect the output to your log file.
要将结果写入top文件，请使用该-n 1选项（仅一次迭代）并将输出重定向到您的日志文件。
top -p $(pgrep -d',' http) -n 1 >> your_log_file
To do that every second, perhaps a whileloop with a sleepwould do?
每秒都这样做，也许一个while带有 a的循环sleep会做？
while :; do top -p $(pgrep -d',' http) -n 1 >> your_log_file; sleep 1; done
To timestamp each entry, you can append the output of date. E.g.
要为每个条目添加时间戳，您可以附加date. 例如
while :; do top -p $(pgrep -d',' http) -n 1 >> log.txt; date >> log.txt; sleep 1; done
回答by Inti Gonzalez-Herrera
Another option is:
另一种选择是：
top -b -d 1 -p $(pgrep -d',' java) -n 120 > log.txt
- The option -d allows to set the frequency used by top to refresh the data.
- The option -b means that the traditional interface of top is not used. Instead, it sends everything to the standard output and then you can use a pipe (|) or a redirection (>).
- The option -n informs about the number of iterations top should execute.
- 选项 -d 允许设置 top 用于刷新数据的频率。
- 选项 -b 表示不使用传统的 top 接口。相反，它将所有内容发送到标准输出，然后您可以使用管道 (|) 或重定向 (>)。
- 选项 -n 通知 top 应该执行的迭代次数。
After that you can type:
之后，您可以键入：
cat log.txt | grep USER_OF_PROCESS
You will see the execution time of the process and also %CPU, Memory and all that.
您将看到进程的执行时间以及 %CPU、内存等等。
回答by user3193783
#You can run following script as ./cpurecorder.sh pid filename
#It will generate output file with memory usage and cpu utilisation.
#You can log other variable by searching man for ps.
`enter code here`filepath=/home/rtcsadm # modify as desired
interval=20 # reports per minute
timelimit=6000 # how long to run, in seconds
mydate=`date "+%H:%M:%S"` # the timestamp
freq=$((60/$interval)) # for sleep function
while [ "$SECONDS" -le "$timelimit" ] ; do
ps -p -opid -opcpu -opmem -ocomm -c | grep | sed "s/^/$mydate /" >> $filepath/.txt
sleep 3
mydate=`date "+%H:%M:%S"`
done
