Escali 4.4 manual MPIcallDcallsDtimeDfreq TcallsTtimeTfreq

1: MPI_Comm_rank	1	3.1us	3.1us	1	3.1us	3.1us
1: MPI_Comm_size	1	1.5us	1.5us	1	1.5us	1.5us
1: MPI_Gather	1	109.9us	109.9us	1	109.9us	109.9us
1: MPI_Init	1	1.0s	1.0s	1	1.0s	1.0s
1: MPI_Keyval_free	1	1.2us	1.2us	1	1.2us	1.2us
1: MPI_Reduce	1	51.5us	51.5us	1	51.5us	51.5us
1: MPI_Scatter	1	138.7us	138.7us	1	138.7us	138.7us
1: Sum	9	1.0s	112.8ms	9	1.0s	112.8ms
1: Overhead	0	0.0ns		9	27.2us	3.0us

1:=====================================================================

0:13.26.40 -------------Delta---------- ---------Total----------

0: Init+0.111598 s	#calls	time	tim/cal	#calls	time	tim/cal
0: MPI_Bcast	2	79.6us	39.8us	2	79.6us	39.8us
0: MPI_Comm_rank	1	3.3us	3.3us	1	3.3us	3.3us
0: MPI_Comm_size	1	1.4us	1.4us	1	1.4us	1.4us
0: MPI_Gather	1	648.8us	648.8us	1	648.8us	648.8us
0: MPI_Init	1	965.9ms	965.9ms	1	965.9ms	965.9ms
0: MPI_Keyval_free	1	1.1us	1.1us	1	1.1us	1.1us
0: MPI_Reduce	1	37.6ms	37.6ms	1	37.6ms	37.6ms
0: MPI_Scatter	1	258.1us	258.1us	1	258.1us	258.1us
0: Sum	9	1.0s	111.6ms	9	1.0s	111.6ms
0: Overhead	0	0.0ns		9	35.6us	4.0us

0: =====================================================================

The <seconds> field can be set to a large number in order to collect only final statistics.

We see that the output gives statistics about which MPI calls are used and their frequency and timing. Both delta numbers since last printout and the total accumulated statistics. By setting the interval timing (in -s <seconds>) to a large number, only the cumulative statistics at the end are printed. The timings are presented for each process, and with many processes this can yield a huge amount of output. There are many options for modifying SCAMPI_TIMING to reduce this output. The selection parameter can time only those MPI processes to be monitored. There are also other ways to minimize the output, by screening away selected MPI calls either before or after a certain number of calls or between an interval of calls. Some examples are:

The rest of the format has the following fields:

<MPIcall><Dcalls><Dtime><Dfreq> <Tcalls><Ttime><Tfreq>

where
<MPIcall>	is the name of the MPI-call
<Dcalls>	is the number of calls to <MPIcall> since the last printout
<Dtime>	is the sum of the execution-time for calls to <MPIcall> since the
	last printout
<Dfreq>	is the average time-per-call for calls to <MPIcall> since the last
	printout
<Tcalls>	is the number of calls to <MPIcall>
<Ttime>	is the sum of the execution-time for calls to <MPIcall>
<Tfreq>	is the average time-per-call for calls to <MPIcall>

After all detail-lines (one per MPI-call which has been called since last printout), there will be a line with the sum of all calls followed by a line giving the overhead introduced when obtaining the timing measurements.

The second part containing the buffer-statistics has two types of lines, one for receives and one for sends.

Scali MPI Connect Release 4.4 Users Guide 42