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Full Discussion: Load Average and Lwps
Operating Systems Solaris Load Average and Lwps Post 302415622 by jlliagre on Friday 23rd of April 2010 03:37:33 AM
Old 04-23-2010
Quote:
Originally Posted by snjksh
1) Can any one tell me why the load average is so high though the cpu utilization is 85%.
Because there are some short periods of time where the run queue is empty and all threads are waiting for something to happen while there are more other periods of time when plenty of threads want a CPU but none is available. To know if this is an issue, you should tell how many CPUs/Cores/Chip Threads are available on your machine.
Quote:
2) what is lwps and is it harmfull for the system
lwps are light weight processes a.k.a threads. The number of lwps isn't harmful at all.
 
Test Your Knowledge in Computers #908
Difficulty: Medium
If a Unix shell command line ends with the hashtag #, then the job runs in the background, and the shell does not wait for the job to terminate before printing the prompt and waiting for the next command line.
True or False?

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hostinfo(8)						    BSD System Manager's Manual 					       hostinfo(8)

NAME
hostinfo -- host information SYNOPSIS
hostinfo DESCRIPTION
The hostinfo command displays information about the host system on which the command is executing. The output includes a kernel version description, processor configuration data, available physical memory, and various scheduling statistics. OPTIONS
There are no options. DISPLAY
Mach kernel version: The version string compiled into the kernel executing on the host system. Processor Configuration: The maximum possible processors for which the kernel is configured, followed by the number of physical and logical processors avail- able. Note: on Intel architectures, physical processors are referred to as cores, and logical processors are referred to as hardware threads; there may be multiple logical processors per core and multiple cores per processor package. This command does not report the number of processor packages. Processor type: The host's processor type and subtype. Processor active: A list of active processors on the host system. Active processors are members of a processor set and are ready to dispatch threads. On a single processor system, the active processor, is processor 0. Primary memory available: The amount of physical memory that is configured for use on the host system. Default processor set: Displays the number of tasks currently assigned to the host processor set, the number of threads currently assigned to the host proces- sor set, and the number of processors included in the host processor set. Load average: Measures the average number of threads in the run queue. Mach factor: A variant of the load average which measures the processing resources available to a new thread. Mach factor is based on the number of CPUs divided by (1 + the number of runnablethreads) or the number of CPUs minus the number of runnable threads when the number of runnable threads is less than the number of CPUs. The closer the Mach factor value is to zero, the higher the load. On an idle system with a fixed number of active processors, the mach factor will be equal to the number of CPUs. SEE ALSO
sysctl(8) Mac OS X October 30, 2003 Mac OS X

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