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System statistics
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<H3 CLASS="subsection"><A NAME="htoc231">7.24</A> System statistics</H3><UL>
<LI><A HREF="gprolog047.html#toc186"><TT>statistics/0</TT>,
<TT>statistics/2</TT></A>
<LI><A HREF="gprolog047.html#toc187"><TT>user_time/1</TT>,
<TT>system_time/1</TT>,
<TT>cpu_time/1</TT>,
<TT>real_time/1</TT></A>
</UL>
<A NAME="toc186"></A>
<H4 CLASS="subsubsection"><A NAME="htoc232">7.24.1</A> <TT>statistics/0</TT>,
<TT>statistics/2</TT></H4>
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
statistics<BR>
statistics(?atom, ?list)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>statistics</TT> displays statistics about memory usage and run times.<BR>
<BR>
<TT>statistics(Key, Value)</TT> unifies <TT>Value</TT> with the current
value of the statistics key <TT>Key</TT>. <TT>Value</TT> a list of two
elements. Times are in milliseconds, sizes of areas in bytes.<BR>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1>
<TR><TD ALIGN=left NOWRAP>Key</TD>
<TD ALIGN=left NOWRAP>Description</TD>
<TD ALIGN=left NOWRAP>Value</TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>user_time</TT></TD>
<TD ALIGN=left NOWRAP>user CPU time</TD>
<TD ALIGN=left NOWRAP><TT>[SinceStart, SinceLast]</TT></TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>system_time</TT></TD>
<TD ALIGN=left NOWRAP>system CPU time</TD>
<TD ALIGN=left NOWRAP><TT>[SinceStart, SinceLast]</TT></TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>cpu_time</TT></TD>
<TD ALIGN=left NOWRAP>total CPU time (user + system)</TD>
<TD ALIGN=left NOWRAP><TT>[SinceStart,
SinceLast]</TT></TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>real_time</TT></TD>
<TD ALIGN=left NOWRAP>absolute time</TD>
<TD ALIGN=left NOWRAP><TT>[SinceStart, SinceLast]</TT></TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>local_stack</TT></TD>
<TD ALIGN=left NOWRAP>local stack sizes (control, environments, choices)</TD>
<TD ALIGN=left NOWRAP><TT>[UsedSize, FreeSize]</TT></TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>global_stack</TT></TD>
<TD ALIGN=left NOWRAP>global stack sizes (compound terms)</TD>
<TD ALIGN=left NOWRAP><TT>[UsedSize, FreeSize]</TT></TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>trail_stack</TT></TD>
<TD ALIGN=left NOWRAP>trail stack sizes (variable bindings to undo)</TD>
<TD ALIGN=left NOWRAP><TT>[UsedSize, FreeSize]</TT></TD>
</TR>
<TR><TD ALIGN=left NOWRAP><TT>cstr_stack</TT></TD>
<TD ALIGN=left NOWRAP>constraint trail sizes (finite domain constraints)</TD>
<TD ALIGN=left NOWRAP><TT>[UsedSize, FreeSize]</TT></TD>
</TR></TABLE><BR>
Note that the key <TT>runtime</TT> is recognized as <TT>user_time</TT> for
compatibility purpose.<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Key</TT> is neither a variable nor a valid key</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>domain_error(statistics_key, Key)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Value</TT> is neither a variable nor a list of two elements</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>domain_error(statistics_value, Value)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Value</TT> is a list of two elements and an element <TT>E</TT>
is neither a variable nor an integer</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>type_error(integer, E)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicates.<BR>
<BR>
<A NAME="toc187"></A>
<H4 CLASS="subsubsection"><A NAME="htoc233">7.24.2</A> <TT>user_time/1</TT>,
<TT>system_time/1</TT>,
<TT>cpu_time/1</TT>,
<TT>real_time/1</TT></H4>
<A NAME="user-time/1"></A>
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
user_time(?integer)<BR>
system_time(?integer)<BR>
cpu_time(?integer)<BR>
real_time(?integer)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>user_time(Time)</TT> unifies <TT>Time</TT> with the user
CPU time elapsed since the start of Prolog.<BR>
<BR>
<TT>system_time(Time)</TT> unifies <TT>Time</TT> with the
system CPU time elapsed since the start of Prolog.<BR>
<BR>
<TT>cpu_time(Time)</TT> unifies <TT>Time</TT> with the CPU
time (user + system) elapsed since the start of Prolog.<BR>
<BR>
<TT>real_time(Time)</TT> unifies <TT>Time</TT> with the
absolute time elapsed since the start of Prolog.<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Time</TT> is neither a variable nor an integer</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>type_error(integer, Time)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicates.<BR>
<BR>
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