3
* Copyright 2010 Google Inc.
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions are met:
8
* 1. Redistributions of source code must retain the above copyright notice,
9
* this list of conditions and the following disclaimer.
10
* 2. Redistributions in binary form must reproduce the above copyright notice,
11
* this list of conditions and the following disclaimer in the documentation
12
* and/or other materials provided with the distribution.
13
* 3. The name of the author may not be used to endorse or promote products
14
* derived from this software without specific prior written permission.
16
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
#include "talk/base/cpumonitor.h"
32
#include "talk/base/common.h"
33
#include "talk/base/logging.h"
34
#include "talk/base/scoped_ptr.h"
35
#include "talk/base/systeminfo.h"
36
#include "talk/base/thread.h"
37
#include "talk/base/timeutils.h"
40
#include "talk/base/win32.h"
48
#if defined(IOS) || defined(OSX)
49
#include <mach/mach_host.h>
50
#include <mach/mach_init.h>
51
#include <mach/host_info.h>
52
#include <mach/task.h>
53
#endif // defined(IOS) || defined(OSX)
55
#if defined(LINUX) || defined(ANDROID)
56
#include <sys/resource.h>
59
#include "talk/base/fileutils.h"
60
#include "talk/base/pathutils.h"
61
#endif // defined(LINUX) || defined(ANDROID)
63
#if defined(IOS) || defined(OSX)
64
static uint64 TimeValueTToInt64(const time_value_t &time_value) {
65
return talk_base::kNumMicrosecsPerSec * time_value.seconds +
66
time_value.microseconds;
68
#endif // defined(IOS) || defined(OSX)
70
// How CpuSampler works
71
// When threads switch, the time they spent is accumulated to system counters.
72
// The time can be treated as user, kernel or idle.
73
// user time is applications.
74
// kernel time is the OS, including the thread switching code itself.
75
// typically kernel time indicates IO.
76
// idle time is a process that wastes time when nothing is ready to run.
78
// User time is broken down by process (application). One of the applications
79
// is the current process. When you add up all application times, this is
80
// system time. If only your application is running, system time should be the
81
// same as process time.
83
// All cores contribute to these accumulators. A dual core process is able to
84
// process twice as many cycles as a single core. The actual code efficiency
85
// may be worse, due to contention, but the available cycles is exactly twice
86
// as many, and the cpu load will reflect the efficiency. Hyperthreads behave
87
// the same way. The load will reflect 200%, but the actual amount of work
88
// completed will be much less than a true dual core.
90
// Total available performance is the sum of all accumulators.
91
// If you tracked this for 1 second, it would essentially give you the clock
92
// rate - number of cycles per second.
93
// Speed step / Turbo Boost is not considered, so infact more processing time
98
// Note Tests on Windows show 600 ms is minimum stable interval for Windows 7.
99
static const int32 kDefaultInterval = 950; // Slightly under 1 second.
101
CpuSampler::CpuSampler()
102
: min_load_interval_(kDefaultInterval)
104
, get_system_times_(NULL),
105
nt_query_system_information_(NULL),
106
force_fallback_(false)
111
CpuSampler::~CpuSampler() {
114
// Set minimum interval in ms between computing new load values. Default 950.
115
void CpuSampler::set_load_interval(int min_load_interval) {
116
min_load_interval_ = min_load_interval;
119
bool CpuSampler::Init() {
120
sysinfo_.reset(new SystemInfo);
121
cpus_ = sysinfo_->GetMaxCpus();
126
// Note that GetSystemTimes is available in Windows XP SP1 or later.
127
// http://msdn.microsoft.com/en-us/library/ms724400.aspx
128
// NtQuerySystemInformation is used as a fallback.
129
if (!force_fallback_) {
130
get_system_times_ = GetProcAddress(GetModuleHandle(L"kernel32.dll"),
133
nt_query_system_information_ = GetProcAddress(GetModuleHandle(L"ntdll.dll"),
134
"NtQuerySystemInformation");
135
if ((get_system_times_ == NULL) && (nt_query_system_information_ == NULL)) {
139
#if defined(LINUX) || defined(ANDROID)
140
Pathname sname("/proc/stat");
141
sfile_.reset(Filesystem::OpenFile(sname, "rb"));
142
if (sfile_.get() == NULL) {
143
LOG_ERR(LS_ERROR) << "open proc/stat failed:";
146
if (!sfile_->DisableBuffering()) {
147
LOG_ERR(LS_ERROR) << "could not disable buffering for proc/stat";
150
#endif // defined(LINUX) || defined(ANDROID)
151
GetProcessLoad(); // Initialize values.
153
// Help next user call return valid data by recomputing load.
154
process_.prev_load_time_ = 0u;
155
system_.prev_load_time_ = 0u;
159
float CpuSampler::UpdateCpuLoad(uint64 current_total_times,
160
uint64 current_cpu_times,
161
uint64 *prev_total_times,
162
uint64 *prev_cpu_times) {
164
if (current_total_times < *prev_total_times ||
165
current_cpu_times < *prev_cpu_times) {
166
LOG(LS_ERROR) << "Inconsistent time values are passed. ignored";
168
const uint64 cpu_diff = current_cpu_times - *prev_cpu_times;
169
const uint64 total_diff = current_total_times - *prev_total_times;
170
result = (total_diff == 0ULL ? 0.f :
171
static_cast<float>(1.0f * cpu_diff / total_diff));
172
if (result > static_cast<float>(cpus_)) {
173
result = static_cast<float>(cpus_);
175
*prev_total_times = current_total_times;
176
*prev_cpu_times = current_cpu_times;
181
float CpuSampler::GetSystemLoad() {
182
uint32 timenow = Time();
183
int elapsed = static_cast<int>(TimeDiff(timenow, system_.prev_load_time_));
184
if (min_load_interval_ != 0 && system_.prev_load_time_ != 0u &&
185
elapsed < min_load_interval_) {
186
return system_.prev_load_;
189
uint64 total_times, cpu_times;
191
typedef BOOL (_stdcall *GST_PROC)(LPFILETIME, LPFILETIME, LPFILETIME);
192
typedef NTSTATUS (WINAPI *QSI_PROC)(SYSTEM_INFORMATION_CLASS,
193
PVOID, ULONG, PULONG);
195
GST_PROC get_system_times = reinterpret_cast<GST_PROC>(get_system_times_);
196
QSI_PROC nt_query_system_information = reinterpret_cast<QSI_PROC>(
197
nt_query_system_information_);
199
if (get_system_times) {
200
FILETIME idle_time, kernel_time, user_time;
201
if (!get_system_times(&idle_time, &kernel_time, &user_time)) {
202
LOG(LS_ERROR) << "::GetSystemTimes() failed: " << ::GetLastError();
205
// kernel_time includes Kernel idle time, so no need to
206
// include cpu_time as total_times
207
total_times = ToUInt64(kernel_time) + ToUInt64(user_time);
208
cpu_times = total_times - ToUInt64(idle_time);
211
if (nt_query_system_information) {
212
ULONG returned_length = 0;
213
scoped_array<SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION> processor_info(
214
new SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION[cpus_]);
215
nt_query_system_information(
216
::SystemProcessorPerformanceInformation,
217
reinterpret_cast<void*>(processor_info.get()),
218
cpus_ * sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION),
221
if (returned_length !=
222
(cpus_ * sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION))) {
223
LOG(LS_ERROR) << "NtQuerySystemInformation has unexpected size";
227
uint64 current_idle = 0;
228
uint64 current_kernel = 0;
229
uint64 current_user = 0;
230
for (int ix = 0; ix < cpus_; ++ix) {
231
current_idle += processor_info[ix].IdleTime.QuadPart;
232
current_kernel += processor_info[ix].UserTime.QuadPart;
233
current_user += processor_info[ix].KernelTime.QuadPart;
235
total_times = current_kernel + current_user;
236
cpu_times = total_times - current_idle;
243
#if defined(IOS) || defined(OSX)
244
host_cpu_load_info_data_t cpu_info;
245
mach_msg_type_number_t info_count = HOST_CPU_LOAD_INFO_COUNT;
246
if (KERN_SUCCESS != host_statistics(mach_host_self(), HOST_CPU_LOAD_INFO,
247
reinterpret_cast<host_info_t>(&cpu_info),
249
LOG(LS_ERROR) << "::host_statistics() failed";
253
const uint64 cpu_times = cpu_info.cpu_ticks[CPU_STATE_NICE] +
254
cpu_info.cpu_ticks[CPU_STATE_SYSTEM] +
255
cpu_info.cpu_ticks[CPU_STATE_USER];
256
const uint64 total_times = cpu_times + cpu_info.cpu_ticks[CPU_STATE_IDLE];
257
#endif // defined(IOS) || defined(OSX)
259
#if defined(LINUX) || defined(ANDROID)
260
if (sfile_.get() == NULL) {
261
LOG(LS_ERROR) << "Invalid handle for proc/stat";
265
sfile_->SetPosition(0);
266
if (!sfile_->ReadLine(&statbuf)) {
267
LOG_ERR(LS_ERROR) << "Could not read proc/stat file";
271
unsigned long long user;
272
unsigned long long nice;
273
unsigned long long system;
274
unsigned long long idle;
275
if (sscanf(statbuf.c_str(), "cpu %Lu %Lu %Lu %Lu",
277
&system, &idle) != 4) {
278
LOG_ERR(LS_ERROR) << "Could not parse cpu info";
281
const uint64 cpu_times = nice + system + user;
282
const uint64 total_times = cpu_times + idle;
283
#endif // defined(LINUX) || defined(ANDROID)
284
system_.prev_load_time_ = timenow;
285
system_.prev_load_ = UpdateCpuLoad(total_times,
287
&system_.prev_total_times_,
288
&system_.prev_cpu_times_);
289
return system_.prev_load_;
292
float CpuSampler::GetProcessLoad() {
293
uint32 timenow = Time();
294
int elapsed = static_cast<int>(TimeDiff(timenow, process_.prev_load_time_));
295
if (min_load_interval_ != 0 && process_.prev_load_time_ != 0u &&
296
elapsed < min_load_interval_) {
297
return process_.prev_load_;
300
FILETIME current_file_time;
301
::GetSystemTimeAsFileTime(¤t_file_time);
303
FILETIME create_time, exit_time, kernel_time, user_time;
304
if (!::GetProcessTimes(::GetCurrentProcess(),
305
&create_time, &exit_time, &kernel_time, &user_time)) {
306
LOG(LS_ERROR) << "::GetProcessTimes() failed: " << ::GetLastError();
310
const uint64 total_times =
311
ToUInt64(current_file_time) - ToUInt64(create_time);
312
const uint64 cpu_times =
313
(ToUInt64(kernel_time) + ToUInt64(user_time));
317
// Common to both OSX and Linux.
319
gettimeofday(&tv, NULL);
320
const uint64 total_times = tv.tv_sec * kNumMicrosecsPerSec + tv.tv_usec;
323
#if defined(IOS) || defined(OSX)
324
// Get live thread usage.
325
task_thread_times_info task_times_info;
326
mach_msg_type_number_t info_count = TASK_THREAD_TIMES_INFO_COUNT;
328
if (KERN_SUCCESS != task_info(mach_task_self(), TASK_THREAD_TIMES_INFO,
329
reinterpret_cast<task_info_t>(&task_times_info),
331
LOG(LS_ERROR) << "::task_info(TASK_THREAD_TIMES_INFO) failed";
335
// Get terminated thread usage.
336
task_basic_info task_term_info;
337
info_count = TASK_BASIC_INFO_COUNT;
338
if (KERN_SUCCESS != task_info(mach_task_self(), TASK_BASIC_INFO,
339
reinterpret_cast<task_info_t>(&task_term_info),
341
LOG(LS_ERROR) << "::task_info(TASK_BASIC_INFO) failed";
345
const uint64 cpu_times = (TimeValueTToInt64(task_times_info.user_time) +
346
TimeValueTToInt64(task_times_info.system_time) +
347
TimeValueTToInt64(task_term_info.user_time) +
348
TimeValueTToInt64(task_term_info.system_time));
349
#endif // defined(IOS) || defined(OSX)
351
#if defined(LINUX) || defined(ANDROID)
353
if (getrusage(RUSAGE_SELF, &usage) < 0) {
354
LOG_ERR(LS_ERROR) << "getrusage failed";
358
const uint64 cpu_times =
359
(usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) * kNumMicrosecsPerSec +
360
usage.ru_utime.tv_usec + usage.ru_stime.tv_usec;
361
#endif // defined(LINUX) || defined(ANDROID)
362
process_.prev_load_time_ = timenow;
363
process_.prev_load_ = UpdateCpuLoad(total_times,
365
&process_.prev_total_times_,
366
&process_.prev_cpu_times_);
367
return process_.prev_load_;
370
int CpuSampler::GetMaxCpus() const {
374
int CpuSampler::GetCurrentCpus() {
375
return sysinfo_->GetCurCpus();
378
///////////////////////////////////////////////////////////////////
379
// Implementation of class CpuMonitor.
380
CpuMonitor::CpuMonitor(Thread* thread)
381
: monitor_thread_(thread ? thread : Thread::Current()) {
382
monitor_thread_->SignalQueueDestroyed.connect(
383
this, &CpuMonitor::OnMessageQueueDestroyed);
386
CpuMonitor::~CpuMonitor() {
390
bool CpuMonitor::Start(int period_ms) {
391
if (!sampler_.Init()) return false;
393
period_ms_ = period_ms;
394
if (monitor_thread_) {
395
monitor_thread_->PostDelayed(period_ms_, this);
400
void CpuMonitor::Stop() {
401
if (monitor_thread_) {
402
monitor_thread_->Clear(this);
406
void CpuMonitor::OnMessage(Message* msg) {
407
int max_cpus = sampler_.GetMaxCpus();
408
int current_cpus = sampler_.GetCurrentCpus();
409
float process_load = sampler_.GetProcessLoad();
410
float system_load = sampler_.GetSystemLoad();
411
SignalUpdate(current_cpus, max_cpus, process_load, system_load);
413
if (monitor_thread_) {
414
monitor_thread_->PostDelayed(period_ms_, this);
418
} // namespace talk_base
added
removed
protocols/jabber/googletalk/libjingle/talk/base/cpumonitor.cc
