[complement-svn] SF.net SVN: complement: [1321] trunk/explore/perf/STL
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[complement-svn] SF.net SVN: complement: [1321] trunk/explore/perf/STL
|
From: <com...@us...> - 2006-10-16 15:03:07
|
Revision: 1321
http://svn.sourceforge.net/complement/?rev=1321&view=rev
Author: complement
Date: 2006-10-16 08:02:27 -0700 (Mon, 16 Oct 2006)
Log Message:
-----------
add tests for expression template (proxy string objects) technique
Modified Paths:
--------------
trunk/explore/perf/STL/compare.tex
trunk/explore/perf/STL/lib/Makefile
trunk/explore/perf/STL/string/Makefile
trunk/explore/perf/STL/string/test.sh
trunk/explore/perf/STL/strings.gplot
Added Paths:
-----------
trunk/explore/perf/STL/lib/texpr/
trunk/explore/perf/STL/lib/texpr/Makefile
trunk/explore/perf/STL/string/add-proxy/
trunk/explore/perf/STL/string/add-proxy/Makefile
trunk/explore/perf/STL/string/add-proxy/Makefile.inc
trunk/explore/perf/STL/string/add-proxy/STLport-add-str-proxy/
trunk/explore/perf/STL/string/add-proxy/STLport-add-str-proxy/Makefile
trunk/explore/perf/STL/string/add-proxy/STLport-default/
trunk/explore/perf/STL/string/add-proxy/STLport-default/Makefile
trunk/explore/perf/STL/string/add-proxy/libstdc++/
trunk/explore/perf/STL/string/add-proxy/libstdc++/Makefile
trunk/explore/perf/STL/string/add-proxy/str.cc
Removed Paths:
-------------
trunk/explore/perf/STL/build/lib/forcestringterm/
trunk/explore/perf/STL/build/lib/libstdc++/
trunk/explore/perf/STL/build/lib/malloc/
trunk/explore/perf/STL/build/lib/newalloc/
trunk/explore/perf/STL/build/lib/noshortstr/
trunk/explore/perf/STL/lib/forcestringterm/
Property Changed:
----------------
trunk/explore/perf/STL/build/lib/
Property changes on: trunk/explore/perf/STL/build/lib
___________________________________________________________________
Name: svn:ignore
- *.so*
+ *.so*
texpr
libstdc++
malloc
newalloc
noshortstr
Modified: trunk/explore/perf/STL/compare.tex
===================================================================
--- trunk/explore/perf/STL/compare.tex 2006-10-13 15:08:00 UTC (rev 1320)
+++ trunk/explore/perf/STL/compare.tex 2006-10-16 15:02:27 UTC (rev 1321)
@@ -1,4 +1,4 @@
-% -*- LaTeX -*- Time-stamp: <06/01/05 13:08:22 ptr>
+% -*- LaTeX -*- Time-stamp: <06/10/16 19:00:51 ptr>
\documentclass[a4paper]{article}
@@ -30,21 +30,16 @@
\maketitle
\begin{abstract}
-This article present comparison of
-strings implementation in \STLport{} and \libstd.
+This article present comparison of STL strings with copy-on-write and
+non-copy-on-write argorithms, based on \STLport{} strings and ropes
+and \libstd{} implementations.
-This tests also can help to answer on question:
-is it strings copy algorithm with constant complexity
-better than algorithm with linear complexity?
-This comparison is done on the base of STLport strings, ropes
-and \libstd{} strings.
+Some related issues, like fstream and stringstream performance
+are also under consideration.
-Small mesure for iostreams implementations (and adequate C code)
-and publication of test times for two hardware (but both has x86 architecture)
-platforms was recently added.
-
I expect that this results will help to make decision between
-STL implementations as well proper choice of strings implementation.
+STL implementations as well proper choice of strings implementation
+and STL usage technique.
\end{abstract}
\tableofcontents
@@ -53,14 +48,13 @@
In the tests was used following computers and operational envirinments:
\begin{enumerate}
- \item Hands-made machine (assembled by Tersys company) with two $1.33$-GHz
- AMD$^{\mbox{\tiny\textregistered}}$ Athlon$^{\mbox{\tiny\textregistered}}$ XP 1500+ processors under Linux (kernel 2.6.12.5, \verb|glibc| 2{.}2{.}5);\label{AMD}
- \item ASUS assembled computer with Intel$^{\mbox{\tiny\textregistered}}$ Pentium$^{\mbox{\tiny\textregistered}}$ 4 $2.4$-GHz processor under Linux (kernel 2.6.12.5, \verb|glibc| 2{.}2{.}5).
+ \item Tyan Tiger motherboard, two $1.33$-GHz
+ AMD$^{\mbox{\tiny\textregistered}}$ Athlon$^{\mbox{\tiny\textregistered}}$ XP 1500+ processors under Linux (kernel 2.6.16.26, \verb|glibc| 2{.}3{.}6);\label{AMD}
\end{enumerate}
\section{Compilers}
-For Unix-like systems was used GNU gcc 3{.}4{.}4
+In tests was used GNU gcc 3{.}4{.}4 or 4{.}1{.}1
with appropriate
\verb|libstdc++| libraries (version~3).
@@ -68,7 +62,7 @@
Due to ``time'' function has different options and output format on Linux
and other UINIXes, I use program \texttt{time} from
-\texttt{complement}\footnote{\texttt{http://complement.sourceforge.net}}
+\texttt{complement}\footnote{\texttt{http://complement.sourceforge.net}, see appropriate SVN repository on SourceForge.}
project bundle\footnote{Portability note: system should has \texttt{wait3} function.}.
By the way this function provide high-precision time measure.
@@ -108,6 +102,9 @@
\section{The Tests Descriptions\label{TestsDescr}}
+All tests are ``synthetic'', to show the diference in programming
+technique.
+
\subsection{Add Characters to String\label{incr-string}
(test \#1)}
@@ -139,29 +136,29 @@
\begin{center}
\input strings.tex
\end{center}
- \caption{Comparison of \libstd{} and \STLport{}
- strings implementation. Single thread. $t$ is a wall time for tests.
- The implementation of strings in \STLport{} (copy algorithm complexity $O(n)$)
- drammaticaly faster than ones in \libstd{} or ropes in \STLport{}
- (copy algorithm complexity $O(1)$) for tests with strings modification.
- If the test only copy string, the implementation with $O(1)$ complexity
- is better.
+ \caption{STL strings implementations comparison. Single thread. $t$ is a wall time
+ for tests.
+ The implementation of strings in \STLport{} (non-COW)
+ drammaticaly faster than COW implementations (\libstd{} and
+ ropes in \STLport{}) in tests that modify strings.
+ But if the test only copy string, the COW implementation show better
+ performance.
\label{STLport-gpp-strings}}
\end{figure}
-\begin{figure}
- \begin{center}
- \input intel-amd.tex
- \end{center}
- \caption{Comparison of two x86 platforms. See platforms description
- on page~\pageref{AMD}. This graphics show that higher frequency isn't
- synonym of better perfomance\label{intel-amd}}
-\end{figure}
+%\begin{figure}
+% \begin{center}
+% \input intel-amd.tex
+% \end{center}
+% \caption{Comparison of two x86 platforms. See platforms description
+% on page~\pageref{AMD}. This graphics show that higher frequency isn't
+% synonym of better perfomance\label{intel-amd}}
+%\end{figure}
\subsection{String copy\label{params-string} (test \#4)}
This test intended to hilight the cost of strings copy (jusr copy, without modifications).
-Implementations of strings that use algorithms with constant copy time ($O(1)$)
+Implementations of strings that use copy-on-write algorithms
expected to show better results here.
@@ -169,7 +166,7 @@
You can see (fig.~\ref{STLport-gpp-strings}) that \libstd{} show better
results than \STLport{} in this test. The reason is that \libstd{}
-use copy algorithm with $O(1)$ complexity: during copy operation
+use COW algorithm: during copy operation
there are no memory allocation occur---two strings refer to the same
memory chunk (like \verb|tmp| and \verb|par| on line~$9$). This test
has three copy operations (lines~$7$, $9$ and $20$).
@@ -208,8 +205,39 @@
But you see, for ``short'' strings test with ``short'' strings optimization
show time that $43\%$ better!
+\subsection{String proxy objects\label{add-string-proxy} (tests \#8 and \#9)}
+
+The agregation of strings using the \verb|+| operator is an expensive operation
+as it requires construction of temporary objects that need memory allocation
+and deallocation. The problem can be even more important if you are adding
+several strings together in a single expression. To avoid this problem \STLport{}
+implement expression template. With this technique addition of 2 strings is not
+a string anymore but a temporary object having a reference to each of the
+original strings involved in the expression. This object carry information
+directly to the destination string to set its size correctly and only make
+a single call to the allocator. This technique also works for the addition of
+$N$ elements where elements are \verb|basic_string|, \verb|C| string or a
+single character.
+
+The drawback can be longer compilation time and bigger executable size.
+
+Another problem is that some compilers (gcc) fail to use string proxy object
+if do with class derived from string.
+
+Let's try to estimate the benefits from string proxy technique with following test.
+
+\lstinputlisting{string/add-proxy/str.cc}
+
+Test \#8 is default \STLport{}, in test \#9 used temporary string objects.
+For \libstd{} both \#8 and \#9 are the same test.
+
+
\section{Role of Allocators}
+Note: in the \verb|glibc| 2{.}3{.}6 enhancement of memory allocation
+(over \verb|glibc| 2{.}2{.}5) leads to
+advantage of \STLport{}'s \verb|node_alloc| became insignificant.
+
The \STLport{} provide default ``optimized'' memory allocator
(\verb|node_alloc|). This allocator was used when I run strings tests
for \STLport{} (see section~\ref{TestsDescr}). May be the win of \STLport{} is
@@ -254,7 +282,7 @@
except that every test run simultaneously in two threads.
-\subsection{Comparison of \STLport{} and \libstd}
+\subsection{Comparison of \STLport{} and \libstd in multi-threaded applications}
\begin{figure}
\begin{center}
@@ -424,6 +452,13 @@
\caption{Streams.\label{streams}}
\end{figure}
+\begin{figure}
+ \begin{center}
+ \input streams-1.tex
+ \end{center}
+ \caption{Streams.\label{streamsOne}}
+\end{figure}
+
\subsection{Format output to file\label{fstream-format} (test \#1)}
First test is a format output to a file. File stream opened for writing
@@ -447,6 +482,10 @@
\lstinputlisting{stream/fstream-raw/str2.c}
+And, as reference, unbuffered output (unistd):
+
+\lstinputlisting{stream/fstream-raw/str3.c}
+
\subsection{Raw output to string\label{sstream-raw} (test \#3)}
Raw write to string stream.
Modified: trunk/explore/perf/STL/lib/Makefile
===================================================================
--- trunk/explore/perf/STL/lib/Makefile 2006-10-13 15:08:00 UTC (rev 1320)
+++ trunk/explore/perf/STL/lib/Makefile 2006-10-16 15:02:27 UTC (rev 1321)
@@ -1,6 +1,6 @@
# -*- Makefile -*- Time-stamp: <05/12/26 23:57:38 ptr>
-DIRS = default malloc newalloc misc noshortstr forcestringterm
+DIRS = default malloc newalloc misc noshortstr texpr
# STLPORT_SRC_DIR = ${HOME}/STLport.lab/STLport
# include file, generated by configure, if available
Property changes on: trunk/explore/perf/STL/lib/texpr
___________________________________________________________________
Name: svn:ignore
+ obj
Added: trunk/explore/perf/STL/lib/texpr/Makefile
===================================================================
--- trunk/explore/perf/STL/lib/texpr/Makefile (rev 0)
+++ trunk/explore/perf/STL/lib/texpr/Makefile 2006-10-16 15:02:27 UTC (rev 1321)
@@ -0,0 +1,32 @@
+# -*- Makefile -*- Time-stamp: <05/12/27 01:08:40 ptr>
+
+# STLPORT_SRC_DIR := /export/home/ptr/STLport.lab/STLport
+# include file, generated by configure, if available
+-include ../../../../Makefiles/config.mak
+
+SRCROOT := ${STLPORT_DIR}/build
+INSTALL_LIB_DIR := ../../build/lib/texpr
+INSTALL_LIB_DIR_DBG := .
+INSTALL_LIB_DIR_STLDBG := .
+INSTALL_BIN_DIR := .
+INSTALL_BIN_DIR_DBG := .
+INSTALL_BIN_DIR_STLDBG := .
+ALL_TAGS := install-release-shared
+
+COMPILER_NAME := gcc
+
+STLPORT_INCLUDE_DIR = ${STLPORT_DIR}/stlport
+include ../Makefile.inc
+include ${SRCROOT}/Makefiles/top.mak
+
+ifeq ($(OSNAME),linux)
+DEFS += -D_STLP_REAL_LOCALE_IMPLEMENTED -D_GNU_SOURCE -D_STLP_LEAKS_PEDANTIC
+endif
+
+DEFS += -D_STLP_USE_TEMPLATE_EXPRESSION
+
+# options for build with boost support
+ifdef STLP_BUILD_BOOST_PATH
+INCLUDES += -I$(STLP_BUILD_BOOST_PATH)
+endif
+
Modified: trunk/explore/perf/STL/string/Makefile
===================================================================
--- trunk/explore/perf/STL/string/Makefile 2006-10-13 15:08:00 UTC (rev 1320)
+++ trunk/explore/perf/STL/string/Makefile 2006-10-16 15:02:27 UTC (rev 1321)
@@ -1,6 +1,6 @@
# -*- Makefile -*- Time-stamp: <05/12/27 00:15:29 ptr>
-DIRS = add add-ropes find find-ropes ops ops-ropes params params-ropes/STLport-default params-ropes/STLport-malloc params-ref params-ref-ropes/STLport-default params-ref-ropes/STLport-malloc params-ref-ropes/STLport-newalloc params-short
+DIRS = add add-ropes find find-ropes ops ops-ropes params params-ropes/STLport-default params-ropes/STLport-malloc params-ref params-ref-ropes/STLport-default params-ref-ropes/STLport-malloc params-ref-ropes/STLport-newalloc params-short add-proxy
all:
for d in $(DIRS); do \
Added: trunk/explore/perf/STL/string/add-proxy/Makefile
===================================================================
--- trunk/explore/perf/STL/string/add-proxy/Makefile (rev 0)
+++ trunk/explore/perf/STL/string/add-proxy/Makefile 2006-10-16 15:02:27 UTC (rev 1321)
@@ -0,0 +1,23 @@
+# -*- Makefile -*- Time-stamp: <05/12/27 00:39:55 ptr>
+
+DIRS = STLport-default STLport-add-str-proxy libstdc++
+
+all:
+ for d in $(DIRS); do \
+ (cd $$d; ${MAKE});\
+ done
+
+clean:
+ for d in $(DIRS); do \
+ (cd $$d; ${MAKE} clean); \
+ done
+
+clobber:
+ for d in $(DIRS); do \
+ (cd $$d; ${MAKE} clobber); \
+ done
+
+depend:
+ for d in $(DIRS); do \
+ (cd $$d; ${MAKE} depend); \
+ done
Added: trunk/explore/perf/STL/string/add-proxy/Makefile.inc
===================================================================
--- trunk/explore/perf/STL/string/add-proxy/Makefile.inc (rev 0)
+++ trunk/explore/perf/STL/string/add-proxy/Makefile.inc 2006-10-16 15:02:27 UTC (rev 1321)
@@ -0,0 +1,5 @@
+# -*- makefile -*- Time-stamp: <02/03/11 16:03:54 ptr>
+# $Id: Makefile.inc 999 2004-07-29 09:01:20Z ptr $
+
+PRGNAME = str
+SRC_CC = ../str.cc
Property changes on: trunk/explore/perf/STL/string/add-proxy/STLport-add-str-proxy
___________________________________________________________________
Name: svn:ignore
+ obj
Added: trunk/explore/perf/STL/string/add-proxy/STLport-add-str-proxy/Makefile
===================================================================
--- trunk/explore/perf/STL/string/add-proxy/STLport-add-str-proxy/Makefile (rev 0)
+++ trunk/explore/perf/STL/string/add-proxy/STLport-add-str-proxy/Makefile 2006-10-16 15:02:27 UTC (rev 1321)
@@ -0,0 +1,14 @@
+# -*- Makefile -*- Time-stamp: <05/12/27 00:41:26 ptr>
+
+SRCROOT := ../../../../..
+COMPILER_NAME := gcc
+
+ALL_TAGS := release-shared
+
+
+include ../Makefile.inc
+include ${SRCROOT}/Makefiles/top.mak
+
+DEFS += -D_STLP_USE_TEMPLATE_EXPRESSION
+
+release-shared: LDSEARCH = -L../../../build/lib/texpr -Wl,-rpath=../build/lib/texpr
Property changes on: trunk/explore/perf/STL/string/add-proxy/STLport-default
___________________________________________________________________
Name: svn:ignore
+ obj
Added: trunk/explore/perf/STL/string/add-proxy/STLport-default/Makefile
===================================================================
--- trunk/explore/perf/STL/string/add-proxy/STLport-default/Makefile (rev 0)
+++ trunk/explore/perf/STL/string/add-proxy/STLport-default/Makefile 2006-10-16 15:02:27 UTC (rev 1321)
@@ -0,0 +1,12 @@
+# -*- Makefile -*- Time-stamp: <05/12/27 00:40:16 ptr>
+
+SRCROOT := ../../../../..
+COMPILER_NAME := gcc
+
+ALL_TAGS := release-shared
+
+
+include ../Makefile.inc
+include ${SRCROOT}/Makefiles/top.mak
+
+release-shared: LDSEARCH = -L../../../build/lib -Wl,-rpath=../build/lib
Property changes on: trunk/explore/perf/STL/string/add-proxy/libstdc++
___________________________________________________________________
Name: svn:ignore
+ obj
Added: trunk/explore/perf/STL/string/add-proxy/libstdc++/Makefile
===================================================================
--- trunk/explore/perf/STL/string/add-proxy/libstdc++/Makefile (rev 0)
+++ trunk/explore/perf/STL/string/add-proxy/libstdc++/Makefile 2006-10-16 15:02:27 UTC (rev 1321)
@@ -0,0 +1,14 @@
+# -*- Makefile -*- Time-stamp: <05/12/27 00:40:46 ptr>
+
+SRCROOT := ../../../../..
+COMPILER_NAME := gcc
+WITHOUT_STLPORT := 1
+
+ALL_TAGS := release-shared
+
+
+USE_STDLIB := yes
+
+include ../Makefile.inc
+include ${SRCROOT}/Makefiles/top.mak
+
Added: trunk/explore/perf/STL/string/add-proxy/str.cc
===================================================================
--- trunk/explore/perf/STL/string/add-proxy/str.cc (rev 0)
+++ trunk/explore/perf/STL/string/add-proxy/str.cc 2006-10-16 15:02:27 UTC (rev 1321)
@@ -0,0 +1,20 @@
+// -*- C++ -*- Time-stamp: <03/04/04 23:07:39 ptr>
+
+#include <string>
+
+using namespace std;
+
+int main( int, char * const * )
+{
+ string s;
+ string s1 = "1234567";
+ string s2 = "12345678901234567890";
+ string s3 = ".ext";
+ string s4 = " /* my comment about this */";
+
+ for ( int i = 0; i < 100000000; ++i ) {
+ s = s1 + "/" + s2 + s3 + " => " + s4;
+ }
+
+ return 0;
+}
Modified: trunk/explore/perf/STL/string/test.sh
===================================================================
--- trunk/explore/perf/STL/string/test.sh 2006-10-13 15:08:00 UTC (rev 1320)
+++ trunk/explore/perf/STL/string/test.sh 2006-10-16 15:02:27 UTC (rev 1321)
@@ -1,6 +1,6 @@
#!/bin/sh
#
-# Time-stamp: <04/07/15 01:16:23 ptr>
+# Time-stamp: <06/10/16 18:25:07 ptr>
#
BASEDIR=${PWD}/../../..
@@ -31,6 +31,12 @@
done
# dummy:
echo $j `../stat.awk s.log` >> libstd++.dat
+let j=j+1
+runtest add-proxy/libstdc++
+echo $j `../stat.awk s.log` >> libstd++.dat
+# and dummy again:
+let j=j+1
+echo $j `../stat.awk s.log` >> libstd++.dat
rm -f STLport.dat
touch STLport.dat
@@ -43,6 +49,12 @@
done
runtest params-short/STLport-no-short-str
echo $j `../stat.awk s.log` >> STLport.dat
+let j=j+1
+runtest add-proxy/STLport-default
+echo $j `../stat.awk s.log` >> STLport.dat
+let j=j+1
+runtest add-proxy/STLport-add-str-proxy
+echo $j `../stat.awk s.log` >> STLport.dat
rm -f STLport-malloc.dat
touch STLport-malloc.dat
Modified: trunk/explore/perf/STL/strings.gplot
===================================================================
--- trunk/explore/perf/STL/strings.gplot 2006-10-13 15:08:00 UTC (rev 1320)
+++ trunk/explore/perf/STL/strings.gplot 2006-10-16 15:02:27 UTC (rev 1321)
@@ -22,7 +22,7 @@
set output "strings.eps"
-plot [0.9:7.1][0:25] 'string/STLport.dat' using ($1):($6) notitle w l lt 1, \
+plot [0.9:9.1][0:25] 'string/STLport.dat' using ($1):($6) notitle w l lt 1, \
'string/STLport.dat' using ($1):($6):($7) title "STLport" w yerrorbars lt 1, \
'string/libstd++.dat' using ($1):($6) notitle w l lt 2, \
'string/libstd++.dat' using ($1):($6):($7) title "libstd++" w yerrorbars lt 2, \
@@ -31,22 +31,22 @@
#pause(-1)
-set output "intel-amd.eps"
+#set output "intel-amd.eps"
-plot [0.9:7.1] 'string/STLport.dat' using ($1):($6) notitle w l lt 1, \
- 'string/STLport.dat' using ($1):($6):($7) title "STLport, computer \\#1" w yerrorbars lt 1, \
- 'string/libstd++.dat' using ($1):($6) notitle w l lt 2, \
- 'string/libstd++.dat' using ($1):($6):($7) title "libstd++, computer \\#1" w yerrorbars lt 2, \
- 'string/STLport-1.dat' using ($1):($6) notitle w l lt 3, \
- 'string/STLport-1.dat' using ($1):($6):($7) title "STLport, computer \\#2" w yerrorbars lt 3, \
- 'string/libstd++-1.dat' using ($1):($6) notitle w l lt 4, \
- 'string/libstd++-1.dat' using ($1):($6):($7) title "libstd++, computer \\#2" w yerrorbars lt 4
+#plot [0.9:7.1] 'string/STLport.dat' using ($1):($6) notitle w l lt 1, \
+# 'string/STLport.dat' using ($1):($6):($7) title "STLport, computer \\#1" w yerrorbars lt 1, \
+# 'string/libstd++.dat' using ($1):($6) notitle w l lt 2, \
+# 'string/libstd++.dat' using ($1):($6):($7) title "libstd++, computer \\#1" w yerrorbars lt 2, \
+# 'string/STLport-1.dat' using ($1):($6) notitle w l lt 3, \
+# 'string/STLport-1.dat' using ($1):($6):($7) title "STLport, computer \\#2" w yerrorbars lt 3, \
+# 'string/libstd++-1.dat' using ($1):($6) notitle w l lt 4, \
+# 'string/libstd++-1.dat' using ($1):($6):($7) title "libstd++, computer \\#2" w yerrorbars lt 4
#pause(-1)
set output "alloc.eps"
-plot [0.9:7.1] 'string/STLport.dat' using ($1):($6) notitle w l lt 1, \
+plot [0.9:9.1] 'string/STLport.dat' using ($1):($6) notitle w l lt 1, \
'string/STLport.dat' using ($1):($6):($7) title "node alloc" w yerrorbars lt 1, \
'string/STLport-newalloc.dat' using ($1):($6) notitle w l lt 2, \
'string/STLport-newalloc.dat' using ($1):($6):($7) title "new alloc" w yerrorbars lt 2, \
@@ -174,4 +174,15 @@
'stream/stdio.dat' using ($1):($6):($7) title "stdio" w yerrorbars lt 4, \
'stream/unistd.dat' using ($1):($6):($7) title "unistd" w yerrorbars lt 5
+set output "streams-1.eps"
+
+plot [0.9:3.1] 'stream/STLport.dat' using ($1):($6) notitle w l lt 1, \
+ 'stream/STLport.dat' using ($1):($6):($7) title "node alloc" w yerrorbars lt 1, \
+ 'stream/STLport-malloc.dat' using ($1):($6) notitle w l lt 2, \
+ 'stream/STLport-malloc.dat' using ($1):($6):($7) title "malloc" w yerrorbars lt 2, \
+ 'stream/libstdc++.dat' using ($1):($6) notitle w l lt 3, \
+ 'stream/libstdc++.dat' using ($1):($6):($7) title "libstdc++" w yerrorbars lt 3, \
+ 'stream/stdio.dat' using ($1):($6) notitle w l lt 4, \
+ 'stream/stdio.dat' using ($1):($6):($7) title "stdio" w yerrorbars lt 4
+
#pause(-1)
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