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DynamicWatchdog.cpp File Reference
#include <atomic>
#include <chrono>
#include <thread>
#include "DynamicWatchdog.h"
#include "Shared/Logger.h"
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Functions

static __inline__ uint64_t read_cycle_counter (void)
 
uint64_t dynamic_watchdog_init (unsigned ms_budget)
 
bool dynamic_watchdog ()
 

Function Documentation

bool dynamic_watchdog ( )

Definition at line 69 of file DynamicWatchdog.cpp.

References dw_abort, dw_cycle_budget, DW_DEADLINE, dw_sm_cycle_start, dynamic_watchdog_init(), get_smid(), logger::INFO, LOG, and read_cycle_counter().

69  {
70  auto clock = read_cycle_counter();
71  auto dw_deadline = dynamic_watchdog_init(static_cast<unsigned>(DW_DEADLINE));
72  if (clock > dw_deadline) {
73  LOG(INFO) << "TIMEOUT: thread " << std::this_thread::get_id() << ": clock " << clock
74  << ", deadline " << dw_deadline;
75  return true;
76  }
77  return false;
78 }
static __inline__ uint64_t read_cycle_counter(void)
#define LOG(tag)
Definition: Logger.h:185
uint64_t dynamic_watchdog_init(unsigned ms_budget)

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uint64_t dynamic_watchdog_init ( unsigned  ms_budget)

Definition at line 35 of file DynamicWatchdog.cpp.

References DW_ABORT, dw_abort, dw_cycle_budget, DW_DEADLINE, DW_RESET, read_cycle_counter(), and VLOG.

Referenced by dynamic_watchdog(), Executor::interrupt(), Executor::resetInterrupt(), and Executor::ExecutionDispatch::runImpl().

35  {
36  static uint64_t dw_cycle_start = 0ULL;
37  static uint64_t dw_cycle_budget = 0ULL;
38  static std::atomic_bool dw_abort{false};
39 
40  if (ms_budget == static_cast<unsigned>(DW_DEADLINE)) {
41  if (dw_abort.load()) {
42  {
43  return 0LL;
44  }
45  }
46  return dw_cycle_start + dw_cycle_budget;
47  }
48  if (ms_budget == static_cast<unsigned>(DW_ABORT)) {
49  dw_abort = true;
50  return 0LL;
51  }
52  if (ms_budget == static_cast<unsigned>(DW_RESET)) {
53  dw_abort = false;
54  return 0LL;
55  }
56 
57  // Init cycle start, measure freq, set and return cycle budget
58  dw_cycle_start = read_cycle_counter();
59  std::this_thread::sleep_for(std::chrono::milliseconds(1));
60  auto freq_kHz = read_cycle_counter() - dw_cycle_start;
61  dw_cycle_budget = freq_kHz * static_cast<uint64_t>(ms_budget);
62  VLOG(1) << "INIT: thread " << std::this_thread::get_id() << ": ms_budget " << ms_budget
63  << ", cycle_start " << dw_cycle_start << ", cycle_budget " << dw_cycle_budget
64  << ", dw_deadline " << dw_cycle_start + dw_cycle_budget;
65  return dw_cycle_budget;
66 }
static __inline__ uint64_t read_cycle_counter(void)
__device__ int64_t dw_cycle_budget
__device__ int32_t dw_abort
#define VLOG(n)
Definition: Logger.h:280

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static __inline__ uint64_t read_cycle_counter ( void  )
static

Definition at line 24 of file DynamicWatchdog.cpp.

Referenced by dynamic_watchdog(), and dynamic_watchdog_init().

24  {
25 #if (defined(__x86_64__) || defined(__x86_64))
26  unsigned hi, lo;
27  __asm__ __volatile__("rdtsc" : "=a"(lo), "=d"(hi));
28  return (static_cast<uint64_t>(hi) << 32) | static_cast<uint64_t>(lo);
29 #else
30  // Plug in other architectures' cycle counter reads, e.g. MRC on ARM
31  return 0LL;
32 #endif
33 }

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