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E.2.25. /proc/stat
This file keeps track of a variety of different statistics about the system since it was last restarted. The contents of
/proc/stat, which can be quite long, usually begins like the following example:
Some of the more commonly used statistics include:
cpu— Measures the number of jiffies (1/100 of a second for x86 systems) that the system has been in user mode, user mode with low priority (nice), system mode, idle task, I/O wait, IRQ (hardirq), and softirq respectively. The IRQ (hardirq) is the direct response to a hardware event. The IRQ takes minimal work for queuing the "heavy" work up for the softirq to execute. The softirq runs at a lower priority than the IRQ and therefore may be interrupted more frequently. The total for all CPUs is given at the top, while each individual CPU is listed below with its own statistics. The following example is a 4-way Intel Pentium Xeon configuration with multi-threading enabled, therefore showing four physical processors and four virtual processors totaling eight processors.page— The number of memory pages the system has written in and out to disk.swap— The number of swap pages the system has brought in and out.intr— The number of interrupts the system has experienced.btime— The boot time, measured in the number of seconds since January 1, 1970, otherwise known as the epoch.
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