external/srs
1
0
Fork 0
mirror of https://github.com/ossrs/srs.git synced 2025-02-13 03:41:55 +00:00
Code Issues Releases Wiki Activity

add comments for utility, the USER_HZ for /proc/stat

Browse source
This commit is contained in:
winlin 2014-07-27 11:44:48 +08:00
parent 6d9d9ee3c5
commit a645b403c8
2 changed files with 39 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
trunk/src/app/srs_app_utility.cpp
View file

@ -283,6 +283,17 @@ bool get_proc_self_stat(SrsProcSelfStat& r)
void srs_update_proc_stat()
{
// always assert the USER_HZ is 1/100ths
// @see: http://stackoverflow.com/questions/7298646/calculating-user-nice-sys-idle-iowait-irq-and-sirq-from-proc-stat/7298711
static bool user_hz_assert = false;
if (!user_hz_assert) {
user_hz_assert = true;
int USER_HZ = sysconf(_SC_CLK_TCK);
srs_trace("USER_HZ=%d", USER_HZ);
srs_assert(USER_HZ == 100);
}
// system cpu stat
if (true) {
SrsProcSystemStat r;

30
trunk/src/app/srs_app_utility.hpp
View file

@ -49,6 +49,7 @@ extern int srs_socket_connect(std::string server, int port, int64_t timeout, st_
*/
extern int srs_get_log_level(std::string level);
// current process resouce usage.
// @see: man getrusage
class SrsRusage
{
@ -68,6 +69,7 @@ extern SrsRusage* srs_get_system_rusage();
// the deamon st-thread will update it.
extern void srs_update_system_rusage();
// to stat the process info.
// @see: man 5 proc, /proc/[pid]/stat
class SrsProcSelfStat
{
@ -220,7 +222,23 @@ public:
SrsProcSelfStat();
};
// to stat the cpu time.
// @see: man 5 proc, /proc/stat
/**
* about the cpu time, @see: http://stackoverflow.com/questions/16011677/calculating-cpu-usage-using-proc-files
* for example, for ossrs.net, a single cpu machine:
* [winlin@SRS ~]$ cat /proc/uptime && cat /proc/stat
* 5275153.01 4699624.99
* cpu 43506750 973 8545744 466133337 4149365 190852 804666 0 0
* where the uptime is 5275153.01s
* generally, USER_HZ sysconf(_SC_CLK_TCK)=100, which means the unit of /proc/stat is "1/100ths seconds"
* that is, USER_HZ=1/100 seconds
* cpu total = 43506750+973+8545744+466133337+4149365+190852+804666+0+0 (USER_HZ)
* = 523331687 (USER_HZ)
* = 523331687 * 1/100 (seconds)
* = 5233316.87 seconds
* the cpu total seconds almost the uptime, the delta is more precise.
*/
class SrsProcSystemStat
{
public:
@ -234,7 +252,8 @@ public:
// always be cpu
char label[32];
//The amount of time, measured in units of USER_HZ (1/100ths of a second on most architectures, use
// 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)
//
// the system spent in user mode,
@ -275,6 +294,7 @@ extern SrsProcSystemStat* srs_get_system_proc_stat();
// the deamon st-thread will update it.
extern void srs_update_proc_stat();
// stat system memory info
// @see: cat /proc/meminfo
class SrsMemInfo
{
@ -312,6 +332,7 @@ extern SrsMemInfo* srs_get_meminfo();
// the deamon st-thread will update it.
extern void srs_update_meminfo();
// system cpu hardware info.
// @see: cat /proc/cpuinfo
class SrsCpuInfo
{
@ -330,7 +351,7 @@ public:
// get system cpu info, use cache to avoid performance problem.
extern SrsCpuInfo* srs_get_cpuinfo();
// platform(os, srs) summary
// platform(os, srs) uptime/load summary
class SrsPlatformInfo
{
public:
@ -341,7 +362,11 @@ public:
int64_t srs_startup_time;
// @see: cat /proc/uptime
// system startup time in seconds.
double os_uptime;
// system all cpu idle time in seconds.
// @remark to cal the cpu ustime percent:
// os_ilde_time % (os_uptime * SrsCpuInfo.nb_processors_online)
double os_ilde_time;
// @see: cat /proc/loadavg
@ -446,6 +471,7 @@ std::string srs_get_local_ip(int fd);
// where peer ip is the client public ip which connected to server.
std::string srs_get_peer_ip(int fd);
// dump summaries for /api/v1/summaries.
void srs_api_dump_summaries(std::stringstream& ss);
#endif