It is useful here because it indicates both CPU utilization and saturation on one line. $ vmstat 5 kthr memory page disk faults cpu r b w swap free re mf linux multithreading solaris cpu-usage share|improve this question asked Oct 5 '09 at 10:06 mkamthan 6011819 For linux there's an exact duplicate(stackoverflow.com/questions/1431569/…). –Pavel Shved Oct 5 '09 at 10:23 Look at the bottom part of the output. Find More Posts by DotHQ Thread Tools Show Printable Version Email this Page Search this Thread Advanced Search Posting Rules You may not post new threads You may not post navigate here
Keeping windshield ice-free without heater A Little Cryptic Puzzle How can I take a photo through trees but focus on an object behind the trees? prstat -L -p
reply LCK Anonymous - 05/30/2011 - 21:34 Does LCK contributes to User Time as reported by mpstat ? Three javacores/threaddumps taken a minute apart is a good starting point. Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. We conclude by observing that the filebench flowop_start function is performing the majority of semsys system calls on the system.  What about CMT Processors?
Share it.Click to print (Opens in new window)Click to email this to a friend (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pinterest (Opens Browse other questions tagged linux multithreading solaris cpu-usage or ask your own question. This is not very common in Java application servers but it is possible. Solaris 10 Memory Usage Per-CPU utilization - mpstat lists statistics by CPU, to help identify application scaling issues should CPU utilization be unbalanced.
For example, if we see a significant amount of system time (%sys) and a high system call rate (syscl), then we might want to know who or what is causing those Sar Command In Solaris The microstate accounting system maintains accurate time counters for threads as well as CPUs. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. Step C (part 2): Finding java threads: Disclaimer: nothing in this investigation is specific to WebSphere Application Server and up to this step was not JAVA specific.
By specifying the -m (show microstates) and -L (show per-thread) options, we can observe the per-thread microstates. http://www.scalingbits.com/performance/prstat PRSTAT data of your Java VM process is nothing without a Thread Dump data snapshot. How To Check Cpu Usage In Solaris This article will provide with a step by step tutorial along with an example to achieve those goals. Solaris Prstat Load averages - These numbers, available from both the uptime and prstat commands, provide 1-, 5-, and 15-minute averages that combine both utilization and saturation measurements.
Ignoring the prstat command the most CPU time is being consumed by LWPID=30. http://qaisoftware.com/cpu-usage/solaris-get-process-cpu-usage.html What is a non-vulgar synonym for this swear word meaning "an enormous amount"? You are currently viewing LQ as a guest. Clearly in this example, both CPU bound applications are fighting for the one CPU of the test system, resulting in high waiting times (latency) to gain access to a CPU. Solaris Mpstat
Use prstat -mL -p 2656 2 for this. Since we now have a legitimate cpu usage concern, from the first example of vmstat output and there are no messy indications of memory issues we to proceed to Step B. Those with environments that have fully integrated performance monitoring can see what is going on inside the performance monitoring tools. his comment is here JAVA enterprise application servers will have extensions to the basic thread capabilities of the OS and a JAVA thread may use the same native thread for the life of the application,
The numbers under the header id *(cpu idle %) are the ones that are of interest. Man Prstat Note that registered members see fewer ads, and ContentLink is completely disabled once you log in. Javacores will be named (by default) javacore.yyyymmdd.hhmmss.
A non-zero number means there was some queuing for CPU resources. $ prstat -mL PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/LWPID 25765 rmc
The 3 goals of interest to cpu investigations are to find: a) what is the cpu usage of the server/platform and is it a bottleneck? b) if there is a cpu usage problem – which applications and processes are using the cpu and what threads in the processes are using the cpu. LWPID 2 is consuming the most at 5.7%.PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROC/LWPID 3897 techpaste 6.0 5.7 0.1 0.0 0.0 2.6 8.2 weblink The option -n