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refine the cpu usage calc, add total_delta.

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This commit is contained in:
winlin 2014-07-27 12:47:31 +08:00
parent d0bc0884d1
commit d2f125b6d6
2 changed files with 36 additions and 5 deletions
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18
trunk/src/app/srs_app_utility.cpp
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@ -193,6 +193,7 @@ SrsProcSystemStat::SrsProcSystemStat()
ok = false;
sample_time = 0;
percent = 0;
total_delta = 0;
memset(label, 0, sizeof(label));
user = 0;
nice = 0;
@ -205,6 +206,11 @@ SrsProcSystemStat::SrsProcSystemStat()
guest = 0;
}
int64_t SrsProcSystemStat::total()
{
return user + nice + sys + idle + iowait + irq + softirq + steal + guest;
}
SrsProcSelfStat* srs_get_self_proc_stat()
{
return &_srs_system_cpu_self_stat;
@ -307,11 +313,13 @@ void srs_update_proc_stat()
SrsProcSystemStat& o = _srs_system_cpu_system_stat;
// @see: http://blog.csdn.net/nineday/article/details/1928847
int64_t total = (r.user + r.nice + r.sys + r.idle + r.iowait + r.irq + r.softirq + r.steal + r.guest)
- (o.user + o.nice + o.sys + o.idle + o.iowait + o.irq + o.softirq + o.steal + o.guest);
int64_t idle = r.idle - o.idle;
if (total > 0) {
r.percent = (float)(1 - idle / (double)total);
// @see: http://stackoverflow.com/questions/16011677/calculating-cpu-usage-using-proc-files
if (o.total() > 0) {
r.total_delta = r.total() - o.total();
}
if (r.total_delta > 0) {
int64_t idle = r.idle - o.idle;
r.percent = (float)(1 - idle / (double)r.total_delta);
}
// upate cache.

23
trunk/src/app/srs_app_utility.hpp
View file

@ -238,6 +238,20 @@ public:
* = 523331687 * 1/100 (seconds)
* = 5233316.87 seconds
* the cpu total seconds almost the uptime, the delta is more precise.
*
* we run the command about 26minutes:
* [winlin@SRS ~]$ cat /proc/uptime && cat /proc/stat
* 5276739.83 4701090.76
* cpu 43514105 973 8548948 466278556 4150480 190899 804937 0 0
* where the uptime is 5276739.83s
* cpu total = 43514105+973+8548948+466278556+4150480+190899+804937+0+0 (USER_HZ)
* = 523488898 (USER_HZ)
* = 523488898 * 1/100 (seconds)
* = 5234888.98 seconds
* where:
* uptime delta = 1586.82s
* cpu total delta = 1572.11s
* the deviation is more smaller.
*/
class SrsProcSystemStat
{
@ -248,10 +262,16 @@ public:
int64_t sample_time;
// the percent of usage. 0.153 is 15.3%.
float percent;
// the total cpu time units
// @remark, zero for the previous total() is zero.
// the usaged_cpu_delta = total_delta * percent
// previous cpu total = this->total() - total_delta
int64_t total_delta;
// always be cpu
char label[32];
public:
// The amount of time, measured in units of USER_HZ
// (1/100ths of a second on most architectures, use
// sysconf(_SC_CLK_TCK) to obtain the right value)
@ -285,6 +305,9 @@ public:
unsigned long guest;
SrsProcSystemStat();
// get total cpu units.
int64_t total();
};
// get system cpu stat, use cache to avoid performance problem.