What is prstat command in UNIX?
prstat command in UNIX, particularly in Solaris can be used to find memory and CPU consumption of a Java application. prstat needs, process id to show statics of particular process, which can be obtained by using ps command in UNIX, as shown below.
What is the use of Prstat command?
The prstat statistics utility shows a top-level summary of the processes that are using system resources currently. The prstat utility summarizes this information for an every 5 seconds by default and reports the statistics for that period.
Does RSS include swap?
RSS is the Resident Set Size and is used to show how much memory is allocated to that process and is in RAM. It does not include memory that is swapped out.
What is RSS resident set size in Linux?
In computing, resident set size (RSS) is the portion of memory occupied by a process that is held in main memory (RAM). The rest of the occupied memory exists in the swap space or file system, either because some parts of the occupied memory were paged out, or because some parts of the executable were never loaded.
What is difference between sar and Vmstat in Linux?
I managed to figure out the difference of swap data: for sar uses 512-bytes bloks, while vmstat uses kbytes. that makes the numbers somewhat alike. but when it comes to freememory, things are a little bit more difficult.
What is CPU in top command Linux?
The top command produces a frequently updated list of processes. By default, the processes are ordered by percentage of CPU usage, with only the “top” CPU consumers shown. The top command shows how much processing power and memory are being used, as well as other information about the running processes.
How does the prstat utility work in Solaris?
The prstat utility iteratively examines all active processes on the system and reports statistics based on the selected output mode and sort order. prstat provides options to examine only processes matching specified PIDs, UIDs, zone IDs, CPU IDs, and processor set IDs. The -j, -k, -C, -p, -P, -u, -U, and -z options accept lists as arguments.
How are CPUs identified in the prstat command?
Each CPU is identified by an integer as reported by psrinfo. -t : Report total usage summary for each user. The summary includes the total number of processes or LWPs owned by the user, total size of process images, total resident set size, total cpu time, and percentages of recent cpu time and system memory.
What does the summary in prstat tell you?
The summary includes the total number of processes or LWPs owned by the user, total size of process images, total resident set size, total cpu time, and percentages of recent cpu time and system memory. –T : Report information about processes and tasks.
When to use prstat-J in project wise?
If you want to check project wise resource utilization then you need to use prstat -J command as shown below.