PAPI_flops(3)

1PAPI_flips(3)                        PAPI                        PAPI_flips(3)
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NAME

6         PAPI_flips - PAPI High level: Simplified call to get Mflips/s, real and processor time
7         PAPI_flops - PAPI High level: Simplified call to get Mflops/s, real and processor time
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SYNOPSIS

11       C Interface
12       #include <papi.h>
13       int PAPI_flips (float *rtime, float *ptime, long_long *flpins, float *mflips);
14       int PAPI_flops (float *rtime, float *ptime, long_long *flpops, float *mflops);
15       Fortran Interface
16       #include fpapi.h
17       PAPIF_flips(C_FLOAT real_time, C_FLOAT proc_time, C_LONG_LONG flpins, C_FLOAT mflips, C_INT check)
18       PAPIF_flops(C_FLOAT real_time, C_FLOAT proc_time, C_LONG_LONG flpops, C_FLOAT mflops, C_INT check)
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DESCRIPTION

22       The first call to PAPI_flips() or PAPI_flops() will initialize the PAPI
23       High Level interface, set up the counters  to  monitor  PAPI_FP_INS  or
24       PAPI_FP_OPS and PAPI_TOT_CYC events and start the counters.  Subsequent
25       calls will read the counters and return total real time, total  process
26       time,  total  floating point instructions or operations since the start
27       of the measurement and the Mflip/s or Mflop/s rate since latest call to
28       PAPI_flips() or PAPI_flops().  A call to PAPI_stop_counters() will stop
29       the counters from running and then calls such as  PAPI_start_counters()
30       can safely be used.
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ARGUMENTS

34       *rtime -- total realtime since the first PAPI_flops() call
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36       *ptime -- total process time since the first PAPI_flops() call
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38       *flpins,  flpops  --  total  floating  point instructions or operations
39       since the first call
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41       *mflips, *mflops -- Mflip/s or Mflop/s achieved since the previous call
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RETURN VALUES

45       On success, this function returns PAPI_OK.
46        On error, a non-zero error code is returned.
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ERRORS

50        In addition to the possible errors returned by the  various  PAPI  low
51       level calls, the following errors could also be returned:
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53       PAPI_EINVAL
54              The  counters  were  already  started  by  something other than:
55              PAPI_flips() or PAPI_flops().
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57       PAPI_ENOEVNT
58              The floating  point  operations,floating  point  instruction  or
59              total cycles event does not exist.
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61       PAPI_ENOMEM
62              Insufficient memory to complete the operation.
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NOTES

67       Mflip/s,  or  millions  of  floating  point instructions per second, is
68       defined in this context as the number of  instructions  issued  to  the
69       floating  point unit per second. It is usually calculated directly from
70       a counter measurement and may be different from platform  to  platform.
71       Mflop/s,  or  millions  of  floating  point  operations  per second, is
72       intended to represent the number of floating  point  arithmetic  opera‐
73       tions  per  second.  Attempts are made to massage the counter values to
74       produce the theoreticallly expected value by,  for  instance,  doubling
75       FMA counts or subtracting floating point loads and stores if necessary.
76       CAVEAT EMPTOR
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79       PAPI_flops()andPAPI_flips() may be called by:
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81            the user application program
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84       PAPI_flops() contains calls to:
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86            PAPI_perror()
87            PAPI_library_init()
88            PAPI_get_hardware_info()
89            PAPI_create_eventset()
90            PAPI_add_event()
91            PAPI_start()
92            PAPI_get_real_usec()
93            PAPI_accum()
94            PAPI_shutdown()
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BUGS

98       These functions have no known bugs.
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