Memory usage, free and used, using sar, top and vmstat in solaris zonecontainer presumably this is referred to as a zone within a cluster, not sure if i get the terminology right. This is the pages scanned by the page scanner, a kernel thread which runs when the amount of free memory falls below a threshold, typically 164th of total physical memory. Without options, vmstat displays a oneline summary of the virtual memory activity since the system was booted. It is also possible to set a count limit for the number of times that you wish vmstat to execute before quitting. As an example of vmstat p output, lets try following commands. Anyway, a thirdparty manages the zone and unfortunately is not helpfulfriendly to assist me on how to check memory usage. Linux performance monitoring with vmstat and iostat commands. My favorite oracle solaris performance analysis commands. Linux vmstat command help and examples computer hope. Identifying cpu bottlenecks with vmstat kthr kernel. The output from the solaris vmstat command without options is. Lazysystemadmin is a useful howto website that covers system administration, operating systems, cloud, devops, virtualization, scripts and video tutorials.
You can trace system calls with truss on solaris an strace on linux. The vmstat command can also display statistics on swapping, cache flushing, and interrupts table 114 output from the vmstat command. I thought if i run vmstat, it will show me how much of the 8192m is free but that does not seem to be the case. On mp multiprocessor systems, vmstat averages the number of cpus into the output. Iostat without any argument displays information about the cpu usage, and. Waiting cpu resources can be shown in unix vmstat command output as the second column under the kthr kernel. These comes built in with the operating system and are easy to use. This command displays a line of output for each disk. This website to share our expertise and knowledge on linux, unix, windows, hardware, security, cloud and. You can use the vmstat command to report virtual memory statistics and. I know i have serious problems and the system is about to crash when id falls below 10. The vmstat command reports statistics about kernel threads, virtual memory, disks, traps and cpu activity. Topics are described for both sparc and x86 based systems, where appropriate.
This is the amount of time in seconds between updates. The significant of the columns are explained in man page of vmstat in details. These values are the averages for each of the statistics since your computer was last rebooted. Understanding the differences between prstat and vmstat.
Remember to ignore the first line of the output as it may contain. The following example shows the output from the df k command on a sparc based. How to read vmstat on sun solaris and what are the key. Solaris 10 system administration commands reference manual vmstat8. If you type vmstat as a command with no parameters, it will show you a set of values.
The vmstat tool is available on most unix and unixlike operating systems. Vmstat output on hpux ok jaime, if you are saying that swapinfo dont show the actual physical memory and its usage then what command i can use to get the physical memory and its current usage. Additional reports give information on a sampling period of length delay. Linux provides a way for you to monitor all of this activity in the shape of the vmstat command, which reports on virtual memory statistics. Solaris has another useful metric in the vmstat output.
How to calculate sar and vmstat memory values unixarena. Memory usage, free and used, using sar, top and vmstat in. Vmstat output on hpux hewlett packard enterprise community. The first report produced gives averages since the last reboot. During execution of the kernel status command, the state of the system can change. I dont want to use any command like top as i am writing a script and the data given by top or glance is very complicated. The prstat command should not simply add up the memory of each process of a user, because many processes share memory with each other. The output of vmstat command use to help identify system bottlenecks. As you can see, each dialect of vmstat reports different information about the current status of the server. Cpu statistics and inputoutput statistics for devices and partitions. This website to share our expertise and knowledge on linux, unix, windows, hardware, security, cloud and open source. Available capacity mounted on rpoolrootsolaris161 191987712 6004395. The uptime command gives the 1 minute, 5 minute and 15 minute load. Now that we have a highlevel understanding of the important vmstat data, lets look into some methods for using vmstat to identify server problems.
Reports generated by the vmstat command can be used to balance system load activity. Hi, i am porting a piece of code from solaris to linux. Understanding the differences between prstat and vmstat output in the solaris os. Displaying virtual memory statistics vmstat you can use the vmstat command to report virtual memory statistics and information about system events such as cpu load, paging, number of context switches, device interrupts, and system calls. Different vmstat output on linux and solaris machines. Reports that are generated by the vmstat command can be used to balance system load activity. You may download and install sysstat using source tarball from link. Feel free to post comments with improvements or questions. These systemwide statistics among all processors are calculated as averages for values that are expressed as percentages, and as sums otherwise. Identifying cpu bottlenecks with vmstat waiting cpu resources can be shown in unix vmstat command output as the second column under the kthr kernel thread state change heading. On sun solaris i am running the below vmstat and need to know key items to look for in the output.
Waiting cpu resources can be shown in unix vmstat command output as the second column under the kthr kernel thread state change heading see listing 21. A beginners guide to solaris performance monitoring and. Vmstat and iostat both commands are available on all major unixlike operating systems. Old kernels might report blocks as 512 bytes, 2048 bytes, or 4096 bytes.
Scope the 3rd part in the vmstat series diggs deeper into the virtual memory statistics and troubleshooting virtual memory bottlenecks along with some other tools like prstat. Linux vmstat does not count itself as a running process. To collect stats from any solarissparcx86 or linuxx86 machines. The value under the free column seems to be for the whole solaris container or am i wrong. For example, the command vmstat 1 displays one new line of utilization data every second, while the command vmstat 1 10 displays one new line per second, but only for the next ten seconds. Users of vmstat can specify a sampling interval which permits observing system activity in nearreal time the vmstat tool is available on most unix and unixlike operating systems, such as freebsd. How do i calculate how much of the allocated 8129m is used and how much is free. Displaying virtual memory statistics vmstat oracle. These systemwide statistics among all processors are calculated as averages for values expressed as percentages, and as sums otherwise. The vmstat command reports statistics about kernel threads, virtual memory, disks, hypervisor pages, traps, and processor activity. Heres part two of my oracle solaris performance cheat sheet with some favorite tricks. It also can clear the accumulators in the kernel sum structure.
Displaying virtual memory statistics vmstat oracle solaris. Lets take a look at process 20078 and see how much memory it really uses. Displaying system performance information managing system. The vmstat command can also display statistics on swapping, cache flushing, and interrupts. Understanding vmstat output explained lazysystemadmin. If relevant, a state change message is included in the vmstat output, in one of the following forms. In the hands of an experienced administrator, vmstat can be used to quickly determine resource utilization and performance issues.
This blog is used to collect useful snippets related to linux, php, mysql and more. The 2nd part in the vmstat series goes through all the fields in the vmstat command output and how to analyze them to troubleshoot a performance bottleneck. Old kernels may report blocks as 512 bytes, 2048 bytes, or 4096 bytes. To generate one week of virtual memory stats spaced out at ten second intervals less the last one is 60,479 10 second intervals.