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.TH "PAPI_sprofil" 3 "Thu Feb 27 2020" "Version 6.0.0.0" "PAPI" \" -*- nroff -*-
.ad l
.nh
.SH NAME
PAPI_sprofil \-
.PP
Generate PC histogram data from multiple code regions where hardware counter overflow occurs\&.
.SH SYNOPSIS
.br
.PP
.SH "Detailed Description"
.PP
.PP
\fBC Interface:\fP
.RS 4
#include <\fBpapi\&.h\fP>
.br
int \fBPAPI_sprofil( PAPI_sprofil_t * prof, int profcnt, int EventSet, int EventCode, int threshold, int flags )\fP;
.RE
.PP
\fBParameters:\fP
.RS 4
\fI*prof\fP pointer to an array of \fBPAPI_sprofil_t\fP structures\&. Each copy of the structure contains the following:
.PD 0
.IP "\(bu" 2
buf -- pointer to a buffer of bufsiz bytes in which the histogram counts are stored in an array of unsigned short, unsigned int, or unsigned long long values, or 'buckets'\&. The size of the buckets is determined by values in the flags argument\&.
.IP "\(bu" 2
bufsiz -- the size of the histogram buffer in bytes\&. It is computed from the length of the code region to be profiled, the size of the buckets, and the scale factor as discussed below\&.
.IP "\(bu" 2
offset -- the start address of the region to be profiled\&.
.IP "\(bu" 2
scale -- broadly and historically speaking, a contraction factor that indicates how much smaller the histogram buffer is than the region to be profiled\&. More precisely, scale is interpreted as an unsigned 16-bit fixed-point fraction with the decimal point implied on the left\&. Its value is the reciprocal of the number of addresses in a subdivision, per counter of histogram buffer\&.
.PP
.br
\fIprofcnt\fP number of structures in the prof array for hardware profiling\&.
.br
\fIEventSet\fP The PAPI EventSet to profile\&. This EventSet is marked as profiling-ready, but profiling doesn't actually start until a \fBPAPI_start()\fP call is issued\&.
.br
\fIEventCode\fP Code of the Event in the EventSet to profile\&. This event must already be a member of the EventSet\&.
.br
\fIthreshold\fP minimum number of events that must occur before the PC is sampled\&. If hardware overflow is supported for your component, this threshold will trigger an interrupt when reached\&. Otherwise, the counters will be sampled periodically and the PC will be recorded for the first sample that exceeds the threshold\&. If the value of threshold is 0, profiling will be disabled for this event\&.
.br
\fIflags\fP bit pattern to control profiling behavior\&. Defined values are given in a table in the documentation for PAPI_pofil
.RE
.PP
\fBReturn values:\fP
.RS 4
\fIReturn\fP values for \fBPAPI_sprofil()\fP are identical to those for \fBPAPI_profil\fP\&. Please refer to that page for further details\&.
.RE
.PP
\fBPAPI_sprofil()\fP is a structure driven profiler that profiles one or more disjoint regions of code in a single call\&. It accepts a pointer to a preinitialized array of sprofil structures, and initiates profiling based on the values contained in the array\&. Each structure in the array defines the profiling parameters that are normally passed to \fBPAPI_profil()\fP\&. For more information on profiling, \fBPAPI_profil\fP
.PP
\fBExample:\fP
.RS 4
.PP
.nf
* int retval;
* unsigned long length;
* PAPI_exe_info_t *prginfo;
* unsigned short *profbuf1, *profbuf2, profbucket;
* PAPI_sprofil_t sprof[3];
*
* prginfo = PAPI_get_executable_info();
* if (prginfo == NULL) handle_error( NULL );
* length = (unsigned long)(prginfo->text_end - prginfo->text_start);
* // Allocate 2 buffers of equal length
* profbuf1 = (unsigned short *)malloc(length);
* profbuf2 = (unsigned short *)malloc(length);
* if ((profbuf1 == NULL) || (profbuf2 == NULL))
* handle_error( NULL );
* memset(profbuf1,0x00,length);
* memset(profbuf2,0x00,length);
* // First buffer
* sprof[0]\&.pr_base = profbuf1;
* sprof[0]\&.pr_size = length;
* sprof[0]\&.pr_off = (caddr_t) DO_FLOPS;
* sprof[0]\&.pr_scale = 0x10000;
* // Second buffer
* sprof[1]\&.pr_base = profbuf2;
* sprof[1]\&.pr_size = length;
* sprof[1]\&.pr_off = (caddr_t) DO_READS;
* sprof[1]\&.pr_scale = 0x10000;
* // Overflow bucket
* sprof[2]\&.pr_base = profbucket;
* sprof[2]\&.pr_size = 1;
* sprof[2]\&.pr_off = 0;
* sprof[2]\&.pr_scale = 0x0002;
* retval = PAPI_sprofil(sprof, EventSet, PAPI_FP_INS, 1000000,
* PAPI_PROFIL_POSIX | PAPI_PROFIL_BUCKET_16)) != PAPI_OK)
* if ( retval != PAPI_OK ) handle_error( retval );
*
.fi
.PP
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBPAPI_overflow\fP
.PP
\fBPAPI_get_executable_info\fP
.PP
\fBPAPI_profil\fP
.RE
.PP
.SH "Author"
.PP
Generated automatically by Doxygen for PAPI from the source code\&.
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