{"id":330,"date":"2012-07-06T08:58:38","date_gmt":"2012-07-06T08:58:38","guid":{"rendered":"http:\/\/www.scmgalaxy.com\/tutorials\/2012\/07\/06\/linux-performance-monitoring-using-iostat-mpstat-and-vmstat\/"},"modified":"2021-02-27T09:52:52","modified_gmt":"2021-02-27T09:52:52","slug":"linux-performance-monitoring-using-iostat-mpstat-and-vmstat","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/linux-performance-monitoring-using-iostat-mpstat-and-vmstat\/","title":{"rendered":"Linux Performance Monitoring using iostat, mpstat and vmstat | Linux Performance Monitoring Guide"},"content":{"rendered":"<h3><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3788 aligncenter\" src=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2012\/07\/linux-performance-monitorin.png\" alt=\"linux-performance-monitoring\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2012\/07\/linux-performance-monitorin.png 600w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2012\/07\/linux-performance-monitorin-300x200.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/h3>\n<h3><strong>iostat<\/strong> reports CPU, disk I\/O, and NFS statistics.<\/h3>\n<p><strong>mpstat<\/strong> reports processors statictics.<br \/>\n<strong>vmstat<\/strong> reports virtual memory statistics.<\/p>\n<p><a href=\"http:\/\/sfdoccentral.symantec.com\/vom\/4.0\/win_unix\/html\/vom_winadm_addon_users\/SFW_VOM40\/apas11.htm\">vxstat<\/a> &#8211; This Utility can be used as well.<\/p>\n<h3><strong>iostat<\/strong> reports CPU, disk I\/O, and NFS statistics.<\/h3>\n<p>The iostat command generates two types of reports, the CPU Utilization report and the Device Utilization report. The first report generated by the iostat command is the CPU Utilization Report.<\/p>\n<table border=\"1\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\">iostat commands Table<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat<\/td>\n<td valign=\"top\" width=\"959\">Iostat without any argument displays information about the CPU usage, and I\/O statistics<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -c<\/td>\n<td valign=\"top\" width=\"959\">Display only cpu statistics<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -d<\/td>\n<td valign=\"top\" width=\"959\">Display only disk I\/O statistics<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -n<\/td>\n<td valign=\"top\" width=\"959\">Display only network statistics (device and NFS statistics)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -m<\/td>\n<td valign=\"top\" width=\"959\">Display the device I\/O statistics in Blocks and To change I\/O data in MB\/second<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat \u2013p<\/td>\n<td valign=\"top\" width=\"959\">Display I\/O statistics only for a device(data for all the disks available in the system)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -t<\/td>\n<td valign=\"top\" width=\"959\">By default iostat displays only the current date. To display the current time, use this option<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -x<\/td>\n<td valign=\"top\" width=\"959\">Display extended disk I\/O statistics information<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -x sda1<\/td>\n<td valign=\"top\" width=\"959\">Display Extended status of device sda1<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat 2<\/td>\n<td valign=\"top\" width=\"959\">Execute Every 2 seconds (until you press Ctl-C)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat 2 3<\/td>\n<td valign=\"top\" width=\"959\">To execute every 2 seconds for a total of 3 times<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat -N<\/td>\n<td valign=\"top\" width=\"959\">To display the LVM statistics use option -N as shown below.<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"192\">iostat \u2013V<\/td>\n<td valign=\"top\" width=\"959\">To Display Version<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\"><\/td>\n<td valign=\"top\"><\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">iostat -d -x<\/td>\n<td valign=\"top\">Display only disk I\/O statisticsin in extended form<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">iostat -d -x sda<\/td>\n<td valign=\"top\">Display only sda device I\/O statisticsin in extended form<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">iostat -Td -xdn 5<\/td>\n<td valign=\"top\">For Solaris<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">iostat -d -x 5<\/td>\n<td valign=\"top\">For Linux<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" valign=\"top\"><strong>if Average read or write times over 50 ms, this should be consider for serious i\/o problems<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>The report has the following format:<\/strong><\/p>\n<p><strong>%user<\/strong> &#8211; Show the percentage of CPU utilization that occurred while executing at the user level (application).<br \/>\n<strong>%nice <\/strong>&#8211; provides statistics on a per physical device or partition basis.<br \/>\n<strong>Device<\/strong> &#8211; This column gives the device name<br \/>\n<strong>tps <\/strong>&#8211; Indicate the number of transfers per second that were issued to the device. A transfer is an I\/O request to the device.<br \/>\n<strong>Blk_read\/s<\/strong> &#8211; Indicate the amount of data read from the drive expressed in a number of blocks per second.<br \/>\n<strong>Blk_wrtn\/s<\/strong> &#8211; Indicate the amount of data written to the drive expressed in a number of blocks per second.<br \/>\n<strong>Blk_read<\/strong> &#8211; The total number of blocks read.<br \/>\n<strong>Blk_wrtn <\/strong>&#8211; The total number of blocks written.<br \/>\n<strong>kB_read\/s<\/strong> &#8211; Indicate the amount of data read from the drive expressed in kilobytes per second.<br \/>\n<strong>kB_wrtn\/s<\/strong> &#8211; Indicate the amount of data written to the drive expressed in kilobytes per second.<br \/>\n<strong>wrqm\/s <\/strong>&#8211; The number of write requests merged per second that were issued to the device.<br \/>\n<strong>r\/s<\/strong> &#8211; The number of read requests that were issued to the device per second.<br \/>\n<strong>w\/s<\/strong> &#8211; The number of write requests that were issued to the device per second.<br \/>\n<strong>rsec\/s<\/strong> &#8211; The number of sectors read from the device per second.<br \/>\n<strong>wsec\/s<\/strong> &#8211; The number of sectors written to the device per second.<br \/>\n<strong>await<\/strong> &#8211; The average time (in milliseconds) for I\/O requests issued to the device to be served.<br \/>\n<strong>svctm<\/strong> &#8211; The average service time (in milliseconds) for I\/O requests that were issued to the device.<br \/>\n<strong>%util <\/strong>&#8211; Percentage of CPU time during which I\/O requests were issued to the device.<\/p>\n<h3><strong>vmstat<\/strong> reports virtual memory statistics.<\/h3>\n<table border=\"1\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -a<\/td>\n<td valign=\"top\" width=\"968\">Display active and inactive memory<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -f<\/td>\n<td valign=\"top\" width=\"968\">Display number of forks since last boot<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat 2<\/td>\n<td valign=\"top\" width=\"968\">Execute Every x seconds (for y number of times)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -t 1 100<\/td>\n<td valign=\"top\" width=\"968\">Display timestamp<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -V<\/td>\n<td valign=\"top\" width=\"968\">version info<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -m<\/td>\n<td valign=\"top\" width=\"968\">Display slab info<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -s<\/td>\n<td valign=\"top\" width=\"968\">Display statistics in a table format<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -d<\/td>\n<td valign=\"top\" width=\"968\">Use option -d to display the disk statistics as shown below. This displays the reads, writes, and I\/O statistics of the disk.<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat 1 3<\/td>\n<td valign=\"top\" width=\"968\">vmstat \u2013 Increase the width of the display<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -p sdb1<\/td>\n<td valign=\"top\" width=\"968\">Display statistics for a partition<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"183\">vmstat -S m<\/td>\n<td valign=\"top\" width=\"968\">Display in MB<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>The report has the following format:<\/strong><\/p>\n<p><strong>Procs \u2013 r<\/strong>: Total number of processes waiting to run<br \/>\n<strong>Procs \u2013 b<\/strong>: Total number of busy processes<br \/>\n<strong>Memory \u2013 swpd<\/strong>: Used virtual memory<br \/>\n<strong>Memory \u2013 free<\/strong>: Free virtual memory<br \/>\n<strong>Memory \u2013 buff<\/strong>: Memory used as buffers<br \/>\n<strong>Memory \u2013 cache<\/strong>: Memory used as cache.<br \/>\n<strong>Swap \u2013 si<\/strong>: Memory swapped from disk (for every second)<br \/>\n<strong>Swap \u2013 so<\/strong>: Memory swapped to disk (for every second)<br \/>\n<strong>IO \u2013 bi<\/strong>: Blocks in. i.e blocks received from device (for every second)<br \/>\n<strong>IO \u2013 bo<\/strong>: Blocks out. i.e blocks sent to the device (for every second)<br \/>\n<strong>System \u2013 in<\/strong>: Interrupts per second<br \/>\n<strong>System \u2013 cs<\/strong>: Context switches<br \/>\nCPU \u2013 us, sy, id, wa, st: CPU user time, system time, idle time, wait time<\/p>\n<h3><strong>mpstat<\/strong> reports processors statictics.<\/h3>\n<p>reports processors statictics(mpstat &#8211; Report processors related statistics and mpstat displays CPU statistics )<\/p>\n<p>mpstat :- mpstat displays CPU statistics<br \/>\nmpstat -A :- Display all information<br \/>\nmpstat -P ALL :- Display CPU statistics of individual CPU (or) Core<\/p>\n<p><strong>Reference:<\/strong><br \/>\n<a href=\"http:\/\/www.linux-tutorial.info\/modules.php?name=ManPage&amp;sec=1&amp;manpage=iostat\" target=\"_blank\" rel=\"noopener\">http:\/\/www.linux-tutorial.info\/modules.php?name=ManPage&amp;sec=1&amp;manpage=iostat<\/a><br \/>\n<a href=\"http:\/\/www.thegeekstuff.com\/2011\/07\/iostat-vmstat-mpstat-examples\/\" target=\"_blank\" rel=\"noopener\">http:\/\/www.thegeekstuff.com\/2011\/07\/iostat-vmstat-mpstat-examples\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>iostat reports CPU, disk I\/O, and NFS statistics. mpstat reports processors statictics. vmstat reports virtual memory statistics. vxstat &#8211; This [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":3788,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[54],"tags":[1122,1283,460,2409,2415,2416,2414,2406,858,1289,872,2410,2408,2407,2412,2413,2411,938,213,1277],"class_list":["post-330","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unix-linux","tag-guide","tag-iostat","tag-linux","tag-linux-performance-monitoring","tag-linux-performance-monitoring-using-iostat","tag-linux-performance-monitoring-using-mpstat","tag-linux-performance-monitoring-using-vmstat","tag-linux-tutorial","tag-monitoring","tag-mpstat","tag-performance","tag-performance-monitoring","tag-performance-monitoring-guide","tag-performance-monitoring-tutorial","tag-performance-monitoring-using-iostat","tag-performance-monitoring-using-mpstat","tag-performance-monitoring-using-vmstat","tag-reference","tag-tutorial","tag-vmstat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - 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