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Full Discussion: Load Average threshold
Top Forums UNIX for Dummies Questions & Answers Load Average threshold Post 302380829 by Tytalus on Wednesday 16th of December 2009 09:20:15 AM
Old 12-16-2009
Depends on what you're running....disk intensive operations will have different tolerances than memory intensive...

Point to note - The load average really relates to run-queue length (i.e sum of processes waiting in the run-queue plus those currently executing), so it's more about what still needs to be done, than what is currently being done...

Having said that, :-) short answer is that general consensus is that a load average of 4*number of cpus is considered reasonable.

Adrian Cockcroft wrote a couple of excellent books on performance tuning - highly reccommended reading...

HTH
 
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Unix was the first operating system that was written in a high-level programming language (C Language).
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pset_getloadavg(3C)					   Standard C Library Functions 				       pset_getloadavg(3C)

NAME
pset_getloadavg - get system load averages for a processor set SYNOPSIS
#include <sys/pset.h> #include <sys/loadavg.h> int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); DESCRIPTION
The pset_getloadavg() function returns the number of processes assigned to the specified processor set that are in the system run queue, averaged over various periods of time. Up to nelem samples are retrieved and assigned to successive elements of loadavg[]. The system imposes a maximum of 3 samples, representing averages over the last 1, 5, and 15 minutes, respectively. The LOADAVG_1MIN, LOADAVG_5MIN, and LOADAVG_15MIN indices, defined in <sys/loadavg.h>, can be used to extract the data from the appropri- ate element of the loadavg[] array. If pset is PS_NONE, the load average for processes not assigned to a processor set is returned. If pset is PS_MYID, the load average for the processor set to which the caller is bound is returned. If the caller is not bound to a pro- cessor set, the result is the same as if PS_NONE was specified. RETURN VALUES
Upon successful completion, the number of samples actually retrieved is returned. If the load average was unobtainable or the processor set does not exist, -1 is returned and errno is set to indicate the error. ERRORS
The pset_getloadavg() function will fail if: EINVAL The number of elements specified is less than 0, or an invalid processor set ID was specified. The caller is in a non-global zone, the pools facility is active, and the specified processor set is not that of the zone's pool. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Stable | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
uptime(1), w(1), psrset(1M), prstat(1M), pset_bind(2), pset_create(2), Kstat(3PERL), attributes(5) SunOS 5.10 28 Jun 2004 pset_getloadavg(3C)

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