Linux and Solaris also provide command line tools to monitor CPU utilization. These command line tools are useful when you want to keep a running textual h. Chapter 3, Processes, from the new Solaris Performance and Tools book is excerpted here. Authors Richard McDougall, Jim Mauro, and Brendan Gregg discuss tools that. How can I stress out my CPU, memory. It is not a benchmark, but is rather a tool designed. SPARC Solaris, Compaq Alpha Tru64 UNIX.
Monitoring System Activities ( sar) Use the sar command to perform the following tasks: • Organize and view data about system activity. • Access system activity data on a special request basis. • Generate automatic reports to measure and monitor system performance, as well as special request reports to pinpoint specific performance problems. For information about how to set up the sar command to run on your system, as well as a description of these tools, see. For a detailed description of this command, see the man page. How to Check File Access ( sar -a) • Display file access operation statistics with the sar -a command. $ sar -a SunOS t2k-brm-24 5.10 Generic_144500-10 sun4v.
00:00:00 iget/s namei/s dirbk/s 01:00:00 0 3 0 02:00:00 0 3 0 03:00:00 0 3 0 04:00:00 0 3 0 05:00:00 0 3 0 06:00:00 0 3 0 07:00:00 0 3 0 08:00:00 0 3 0 08:20:01 0 3 0 08:40:00 0 3 0 09:00:00 0 3 0 09:20:01 0 10 0 09:40:01 0 1 0 10:00:02 0 5 0 Average 0 4 0 The following list describes the field names and description of operating system routines that are reported by the sar -a command. Iget/s The number of requests made for inodes that were not in the directory name look-up cache (DNLC). Namei/s The number of file system path searches per second. If namei does not find a directory name in the DNLC, it calls iget to get the inode for either a file or directory.
Hence, most igets are the result of DNLC misses. Dirbk/s The number of directory block reads issued per second. The larger the reported values for these operating system routines, the more time the kernel is spending to access user files. The amount of time reflects how heavily programs and applications are using the file systems. The -a option is helpful for viewing how disk-dependent an application is.
How to Check Buffer Activity ( sar -b) • Display buffer activity statistics with the sar -b command. The buffer is used to cache metadata. Metadata includes inodes, cylinder group blocks, and indirect blocks. $ sar -b 00:00:00 bread/s lread/s%rcache bwrit/s lwrit/s%wcache pread/s pwrit/s 01:00:00 0 0 100 0 0 55 0 0 Example 11-6 Checking Buffer Activity ( sar -b) The following example of sar -b command output shows that the%rcache and%wcache buffers are not causing any slowdowns. All the data is within acceptable limits. $ sar -b SunOS t2k-brm-24 5.10 Generic_144500-10 sun4v. Average number of physical write requests, per second, that use character device interfaces The most important entries are the cache hit ratios%rcache and%wcache.
These entries measure the effectiveness of system buffering. If%rcache falls below 90 percent, or if%wcache falls below 65 percent, it might be possible to improve performance by increasing the buffer space.
How to Check System Call Statistics ( sar -c) • Display system call statistics by using the sar -c command. Superbike 2001 Download Full Version Torrent here. $ sar -c 00:00:00 scall/s sread/s swrit/s fork/s exec/s rchar/s wchar/s 01:00:00 38 2 2 0.00 0.00 149 120 Example 11-7 Checking System Call Statistics ( sar -c) The following example shows output from the sar -c command. $ sar -c SunOS balmy 5.10 Generic_144500-10 sun4v. The number of characters (bytes) transferred by write system calls per second.
How to Check Disk Activity ( sar -d) • Display disk activity statistics with the sar -d command. $ sar -d 00:00:00 device%busy avque r+w/s blks/s avwait avserv Example 11-8 Checking Disk Activity This abbreviated example illustrates the output from the sar -d command. Drivers Seiko Precision Sp-2400 more. $ sar -d SunOS balmy 5.10 Generic_144500-10 sun4v. Average time, in milliseconds, for a transfer request to be completed by the device. For disks, this value includes seek times, rotational latency times, and data transfer times. Note that queue lengths and wait times are measured when something is in the queue.
If%busy is small, large queues and service times probably represent the periodic efforts by the system to ensure that altered blocks are promptly written to the disk. How to Check Page-Out and Memory ( sar -g) • Use the sar -g command to display page-out and memory freeing activities in averages. $ sar -g 00:00:00 pgout/s ppgout/s pgfree/s pgscan/s%ufs_ipf 01:00:00 0.00 0.00 0.00 0.00 0.00 The output displayed by the sar -g command is a good indicator of whether more memory might be needed. Use the ps -elf command to show the number of cycles that are used by the page daemon. A high number of cycles, combined with high values for the pgfree/s and pgscan/s fields, indicates a memory shortage. The sar -g command also shows whether inodes are being recycled too quickly and causing a loss of reusable pages.