Query: sg_get_cpu_stats
OS: debian
Section: 3
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
sg_get_cpu_stats(3) Library Functions Manual sg_get_cpu_stats(3)NAMEsg_get_cpu_stats, sg_get_cpu_stats_diff, sg_get_cpu_percents - get cpu usageSYNOPSIS#include <statgrab.h> sg_cpu_percents *sg_get_cpu_percents(void); sg_cpu_stats *sg_get_cpu_stats(void); sg_cpu_stats *sg_get_cpu_stats_diff(void);DESCRIPTIONsg_get_cpu_stats() and sg_get_cpu_stats_diff() both return static pointers of type sg_cpu_stats. sg_get_cpu_stats() returns the total amount of "ticks" the operating system has spent in each of the different states. sg_get_cpu_stats_diff() returns the difference in "ticks" for each of the states since last time sg_get_cpu_stats_diff() or sg_get_cpu_stats() was called. If it has never been called, it will return the result of sg_get_cpu_stats(). The value stored (the "ticks") will vary between operating systems. For example Solaris has a total of 100 per second, while Linux has sub- stantially more. Also, different operating systems store different information - you won't find nice cpu on Solaris for example. Because of this, you will ideally always want to work on a scale against the total, or in percentages. sg_get_cpu_percents() returns a pointer to a static sg_cpu_percents. The function calls sg_get_cpu_stats_diff() and changes the values into percentages. If it has never been called before (and nor has sg_get_cpu_stats() or sg_get_cpu_stats_diff()), the returned percentages will be the systems total ever since its uptime. (Unless the counters have cycled)RETURN VALUESThere are two structures returned by the CPU statistics functions. typedef struct{ long long user; long long kernel; long long idle; long long iowait; long long swap; long long nice; long long total; time_t systime; }sg_cpu_stats; typedef struct{ float user; float kernel; float idle; float iowait; float swap; float nice; time_t time_taken; }sg_cpu_percents; user kernel idle iowait swap nice The different CPU states. systime time_taken The time taken in seconds since the last call of the function, or the system time.SEE ALSOstatgrab(3)WEBSITEhttp://www.i-scream.org/libstatgrab/ i-scream $Date: 2005/04/25 11:25:45 $ sg_get_cpu_stats(3)
Similar Topics in the Unix Linux Community |
---|
How can I get a processor's CPU Percentage? |
problems in redirecting TOP |
how to trace iowait to a certain process |
Question about SAR command |
How do we extract CPU usage in server? |