Thomas Bastian was a coauthor of an earlier version of this document.The earlier version of this page has been published in the "The Developers Edge" in 2009. ‹ Process Introspection up Next is a command that you can issue to see how much RAM exists on your server. In future releases of Solaris, this locality might be applied to other resources such as I/O.To optimally use NUMA technology, Oracle code spreads SGA in to all locality groups. Thanks much, utopiajoe Remove advertisements Sponsored Links utopiajoe View Public Profile Find all posts by utopiajoe « Previous Thread | Next Thread » Thread Tools Show Printable Version Email this Page
Which processes (or users, zones, projects, tasks) are utilizing my system? Radut Hot Network Questions Could human beings evolve to have longer gestation periods?
For example: L 5-11 uerf -r 300 | grep -i mem Here, the output of the uerf command is piped to grep to filter out and display the segments relating to The SGA can be made smaller by reducing the db_block_buffers on Oracle8i and earlier versions, db_cache_size, sga_max_size, db_xK_cache_size on Oracle9i or shared_pool_size or java_pool_size init.ora parameters. More RAM memory Add additional RAM Only clue was that the CPU usage reported by sar and mpstat was SYS rather than user – so something was going wrong at the OS level. prstat – prstat -J 2 reports about projects Special Report – by Tasks (see newtask(1)) With the option -T to prstat, additional reports about tasks are printed.
There's an enormous amount of literature available about NUMA. Oracle 11g High Cpu Usage Rather, we just want to load those pieces of the executable code that require immediate execution. Since there are 10 shared memory segments ( as visible in ipcs -ma), 10 shmdt calls are executed per session disconnect.Projecting this calculation for 300 connections, CPU consumption will last approximately pri Sort by process priority.
The top utility is invoked by issuing the top command from the UNIX prompt. This maximizes task throughput, but it can be misleading for a neophyte. SIZE: the total virtual memory size of the process, including all mapped files and devices, in kilobytes (K), megabytes (M), or gigabytes (G). jose "at" irisel.com reply Navigation Blogs Drupal...
When an Oracle server begins to run low on RAM memory, the page stealing daemon process awakens and UNIX begins to treat the RAM memory as a sharable resource, moving memory First start the program such as the writer spends zero (0) microseconds in the critical region (ideal case). Solaris Lockstat prstat 2) will examine all processes and report statistics sorted by CPU usage. Thread-based microstate accounting tracks several meaningful states per thread in addition to user and system time, which include trap time, lock time, sleep time and latency time.
Thanks for reading our blog.Cheers Riyaj ReplyLeave a Reply Cancel replyYour email address will not be published. http://jscience.net/cpu-usage/what-to-do-if-your-cpu-usage-is-high.html All Rights Reserved. Reading through the truss output, we can see that system call (shmdt) consumed CPU time. One possible root cause is badly designed locking inside the application resulting in large time spent waiting for synchronisation.
More discussions in Solaris on x86 All PlacesServer & Storage SystemsOracle SolarisSolaris on x86 This discussion is archived 3 Replies Latest reply on Jul 15, 2012 6:36 AM by 946149 High But, this problem manifests only on the PROD1DB server.mpstat output from the PROD1DB server shows the CPU usage in %sys mode. Of course, this is a system call, and so this CPU usage will be in kernel-mode.18.4630 close(10) = 0 18.4807 shmdt(0x380000000) = 0 18.5053 shmdt(0x440000000) = 0 18.5295 shmdt(0x640000000) = 0 weblink If this is a problem due to process destruction, then this will show up on the CLNTDB server too, as it too faces 300 disconnects.
Please enter a title. Then pipe that output through grep to filter out everything not related to memory. The CPU wait could be due to other factors, and this metric simply means that the CPU is waiting for external OS services.
Also notice the high ratio of ICX/VCX (277/22) which shows that the process is frequently involuntarily context switched off the CPU. SID 4306 is the session created for our test connection from DB1 database.select sid, serial#, LOGON_TIME,LAST_CALL_ET from v$session where logon_time > sysdate-(1/24)*(1/60) and machine='machine_name_here' / SID SERIAL# LOGON_TIME LAST_CALL_ET ---------- ---------- The application relies on database link and over a period of time, each session executes SQL through a database link, creating a connection in central database PROD1. Follow Pythian Pythian helps companies adopt disruptive technologies to advance innovation and increase agility.Pythian ExpertiseRelated PostsLog Buffer #447: A Carnival of the Vanities for DBAsHow to Troubleshoot an ORA-28030 ErrorAn UNDO
prstat – prstat -a 2 reports by user Special Report – by Zones With the option -Z to prstat, additional reports about zones are printed. To illustrate this let's take a simple example. Figure 5-25: A sample glance screen Glance is a great tool for reactive tuning because it shows the current status of your Oracle server, along with consumption details for the CPU check over here column 1IT BUSINESS SOLUTIONSData EnablementSoftware VelocityReliable, Scalable ITTECHNOLOGY PRACTICESAdvanced AnalyticsBig DataCloudDatabasesDevOpsInfrastructure ManagementPROFESSIONAL SERVICESIT Strategy + Consulting ServicesImplementation ServicesManaged Servicescolumn 2TECHNOLOGIESAmazon Web ServicesCassandraMicrosoft AzureGoogle Cloud PlatformHadoopMySQLOracleOracle EBSMicrosoft SQL ServerCLIENTSRESOURCESResourcesWhite PaperseBooksWebinarsData SheetsArticlesPresentationsVideoscolumn 3ABOUTAboutLeadership
prstat -m 2 and record the output: prstat – prstat -m 2 output Please observe the top two (2) lines of the output with PID 2223 and PID 2224. During normal operation we may see various points in time when paging in happens a lot and this is not always a cause for concern. See the presentation below for graphical representation of this problem.The symptomsLooking at the symptoms in detail, we can see the CPU usage in sys mode. This will display the total amount of RAM available, and will also show the usage of both RAM and virtual memory: L 5-17 root> top 9:43am up 16 days, 22:33,
prstat usage Scenario – cpu Latency One important measure for CPU saturation is the latency (LAT column) output of prstat.
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