shell_based_monitoring
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| - | ====== Shell Tools for Monitoring Purposes ====== | ||
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| - | ===== CPU Monitoring with top ===== | ||
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| - | ''top'' is the classical tool to monitor CPU behavior of your process, relatively fine grained. As user you are allowed to log in (with ''ssh'') into nodes where jobs of yours are running.** Remember to log out afterwards. | ||
| - | ** | ||
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| - | An example is | ||
| - | <code bash> | ||
| - | top -u <username> | ||
| - | </code> | ||
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| - | Specifiying the username allows to limit the view on own processes. | ||
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| - | ===== Virtual Memory Statistics ===== | ||
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| - | The ''vmstat'' command allows to display statistics of virtual memory, kernerl threads, disks, system processes, I/O blocks, interrupts, CPU activity and much more. This is a good [[http://www.tecmint.com/linux-performance-monitoring-with-vmstat-and-iostat-commands/|example page]]. | ||
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| - | ===== Listing Open Files ===== | ||
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| - | The ''lsof'' command can list processes and their open files. In this list included are disk files, network sockets, pipes, devices and processes. | ||
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| - | One example would be | ||
| - | <code bash> | ||
| - | $ lsof | head | ||
| - | COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME | ||
| - | init 1 root cwd DIR 253,0 4096 2 / | ||
| - | init 1 root rtd DIR 253,0 4096 2 / | ||
| - | init 1 root txt REG 253,0 145180 147164 /sbin/init | ||
| - | init 1 root mem REG 253,0 1889704 190149 /lib/libc-2.12.so | ||
| - | init 1 root 0u CHR 1,3 0t0 3764 /dev/null | ||
| - | init 1 root 1u CHR 1,3 0t0 3764 /dev/null | ||
| - | init 1 root 2u CHR 1,3 0t0 3764 /dev/null | ||
| - | init 1 root 3r FIFO 0,8 0t0 8449 pipe | ||
| - | init 1 root 4w FIFO 0,8 0t0 8449 pipe | ||
| - | init 1 root 5r DIR 0,10 0 1 inotify | ||
| - | init 1 root 6r DIR 0,10 0 1 inotify | ||
| - | init 1 root 7u unix 0xc1513880 0t0 8450 socket | ||
| - | init 1 root DEL REG 8,2 2621484 /lib64/librt-2.12.so | ||
| - | </code> | ||
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| - | Here FD stands for 'file descriptor', some of the values are: | ||
| - | | cwd | current working directory | | ||
| - | | rtd | root directory | | ||
| - | | txt | program text (code and data) | | ||
| - | | mem | memory-mapped file | | ||
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| - | Also in the FD column numbers like 1u are actual file descriptors and followed by u,r,w of it’s mode as: | ||
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| - | | r | for read access. | | ||
| - | | w | for write access. | | ||
| - | | u | for read and write access. | | ||
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| - | TYPE – of files and it’s identification. | ||
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| - | | DIR | Directory | | ||
| - | | REG | Regular file | | ||
| - | | CHR | Character special file. | | ||
| - | | FIFO | First In First Out | | ||
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| - | <code bash> | ||
| - | # to list all files of a particular user and all network connections, type: | ||
| - | lsof -u <username> -i | ||
| - | </code> | ||
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| - | ===== IO Statistics ===== | ||
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| - | I/O Statistics is a little intricate in conjunction with parallel file systems. If you have the need to retrieve detailed I/O statistics for the parallel file system, please do not hesitate to contact the HPC-team. | ||
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| - | Hoever, ''iostat'' is simple tool that will collect and show system input and output storage device statistics. This tool is often used to trace storage device performance issues including devices, local disks, remote disks. It is particularly useful if your job requires local scratch storage and you need to monitor your applicatoin working on it. | ||
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| - | Invoke | ||
| - | <code bash> | ||
| - | iostat -d | ||
| - | </code> | ||
| - | for such a statistic. | ||
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| - | ===== Perf - Linux profiling with performance counters ===== | ||
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| - | [[https://perf.wiki.kernel.org/index.php/Main_Page|perf]] is a versatile and complex command line tool for performance profiling. A well written list of examples can be found [[http://www.brendangregg.com/perf.html|here]]. | ||
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shell_based_monitoring.1465195673.txt.gz · Last modified: 2016/06/06 08:47 (external edit)
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