Etc… -e End time of the report. Amount of cached swap memory in kilobytes. Since no interval and count argument is specified, it will show the report activity for complete day. With recent kernels post 2. Learn System Activity Report sar command with real world scenario examples. To do so, just replace the -z for gzip in the commands here with a -j for bzip2.
A transfer is of indeterminate size. Note that this counter does not include any datagrams discarded while awaiting re-assembly. The int is the interrupt number. The accounting system, based on the values in the count and interval parameters, writes information the specified number of times spaced at the specified intervals in seconds. This can help us to locate the system bottleneck and provide the help to find out the solutions to these annoying performance issues. Device names may also be pretty-printed if option -p is used see below. This will create a pdf file named mem.
A negative value means fewer pages in the cache. If it gets too low e. If the interval parameter is specified without the count parameter, then reports are generated continuously. The following values are displayed: runq-sz Run queue length number of tasks waiting for run time. If the count parameter is not set, all the records saved in the file will be selected. In last post of sar command we have seen its datafile structure, how to extract data from it and time formats to be used with this command.
On Debian and most other distributions, the program is scheduled to run both at 10-minute intervals and once per day at 23:59. Specifying multiple -I int parameters on the command line will look at multiple independent interrupts. The procedures are same as above. The following values are displayed: kbswpfree Amount of free swap space in kilobytes. The load average is calculated as the average number of runnable or running tasks R state , and the number of tasks in uninterruptible sleep D state over the specified interval. This is memory that once was swapped out, is swapped back in but still also is in the swap area if memory is needed it doesn't need to be swapped out again because it is already in the swap area.
The -q option print the queue and overall load average usage for the current date. This program and its related tools are part of the sysstat package. Note that this includes any datagrams which a host cannot route because all of its default routers are down. The following values are displayed: dentunusd Number of unused cache entries in the directory cache. The sar command extracts and writes to standard output records previously saved in a file.
By default names are printed as dev m-n where m and n are the major and minor numbers for the device. The following command will extract the contents of archive. You have to use -o option along with file path of your choice. After this operation, 1022 kB of additional disk space will be used. This option can be used when data are read from or written to a file options -f or -o.
Processing triggers for ureadahead 0. Followed by a data with interval 2 sec and count 3 specified in command. Note that this field includes time spent servicing hardware and software interrupts. The load average is calculated as the average number of runnable or running tasks R state , and the number of tasks in uninterruptible sleep D state over the specified interval. The first thing that most of the Linux system administrators do is to recall the same issue when it previously occurred, and If you remember the day of its previous occurrence then you can easily compare the internal system statistics with the current statistics.
Feed the file to Ksar by clicking on Data and then selecting load from text file. If it is near 100% then almost every page coming off the tail of the inactive list is being reaped. The following values are displayed: kbhugfree Amount of hugepages memory in kilobytes that is not yet allocated. If value is greater than 28, then log files are kept in multiple directories, one for each month. The ksar command The first link shows some summary information about the input file being used to generate the graphs. The -f option is exclusive of the -o option. I'm developing a small utility in Java, that monitors a remote Linux machine's cpu.
The -R option To identify number of memory pages freed, used, and cached per second by the server. The following values are displayed: degC Device temperature expressed in degrees Celsius. Set the interval and count parameters to select count records at interval second intervals. Use this option in conjunction with option -d. System Activity Report, also known as sar, is one of the most important utility for Linux system administrators when it comes to performance monitoring of a Linux system. Swap utilization reports are shown with -S option.
Hence for a more accurate monitoring you can take the help of something called as watch command. The output starts from 12:00 a. This will print past 1 minute, 5 minutes, and 15 minutes report. Note : sar may not installed by default. But if in-depth troubleshooting or monitoring is required then only this option is used.