Hi,
I am reading some large text files and parsing it. typical file size
I am using is 3 MB. It takes around 20 sec just to use std::getline (I
need to treat newlines properly ) for whole file in debug , and 8 sec
while optimization on.
It is for Visual Studio 7.1 and its std library. While vim opens it
in a fraction of sec.
So, is it that getline is reading the file line by line, instead
reading a chunk at a time in its internal buffer? is there any
function to set how much to read from the stream internally ?
I am not very comfortable with read and readsome , to load a large
buffer, as it changes the file position. While I need the visible file
position to be the position I am actually, while "internally " it
should read some more , may be like 1MB chunk ... ?
abir
8  3530 
On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
Hi,
I am reading some large text files and parsing it. typical file size
I am using is 3 MB. It takes around 20 sec just to use std::getline (I
need to treat newlines properly ) for whole file in debug , and 8 sec
while optimization on.
It is for Visual Studio 7.1 and its std library. While vim opens it
in a fraction of sec.
So, is it that getline is reading the file line by line, instead
reading a chunk at a time in its internal buffer? is there any
function to set how much to read from the stream internally ?
I am not very comfortable with read and readsome , to load a large
buffer, as it changes the file position. While I need the visible file
position to be the position I am actually, while "internally " it
should read some more , may be like 1MB chunk ... ?
I'm not sure, but I think it's the other way around, Vim does not read
the whole file at once so it's faster.
Each ifstream has a buffer associated with it, you can get a pointer
to it with the rdbuf()-method and you can specify an array to use as
buffer with the pubsetbuf()-method. See the following link for a short
example: http://www.cplusplus.com/reference/i...pubsetbuf.html
--
Erik Wikström
On Feb 19, 5:44 pm, "Erik Wikström" <eri...@student .chalmers.se>
wrote:
On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
Hi,
I am reading some large text files and parsing it. typical file size
I am using is 3 MB. It takes around 20 sec just to use std::getline (I
need to treat newlines properly ) for whole file in debug , and 8 sec
while optimization on.
It is for Visual Studio 7.1 and its std library. While vim opens it
in a fraction of sec.
So, is it that getline is reading the file line by line, instead
reading a chunk at a time in its internal buffer? is there any
function to set how much to read from the stream internally ?
I am not very comfortable with read and readsome , to load a large
buffer, as it changes the file position. While I need the visible file
position to be the position I am actually, while "internally " it
should read some more , may be like 1MB chunk ... ?
I'm not sure, but I think it's the other way around, Vim does not read
the whole file at once so it's faster.
Each ifstream has a buffer associated with it, you can get a pointer
to it with the rdbuf()-method and you can specify an array to use as
buffer with the pubsetbuf()-method. See the following link for a short
example:http://www.cplusplus.com/reference/i...pubsetbuf.html
--
Erik Wikström
Hi,
I had checked it in a separate console project (multi threaded ) it
is running perfectly, and reads within .8 sec. However the same code
takes 12 sec when running inside my Qt app.
I fear Qt lib is interacting with c++ runtime is some way to cause the
problem ....
May be I need to build the Qt lib a fresh to check what is wrong.
Thanks for answering the question ....
abir
toton wrote:
On Feb 19, 5:44 pm, "Erik Wikström" <eri...@student .chalmers.se>
wrote:
>On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
>>Hi,
I am reading some large text files and parsing it. typical file size
I am using is 3 MB. It takes around 20 sec just to use std::getline (I
need to treat newlines properly ) for whole file in debug , and 8 sec
while optimization on.
It is for Visual Studio 7.1 and its std library. While vim opens it
in a fraction of sec.
So, is it that getline is reading the file line by line, instead
reading a chunk at a time in its internal buffer? is there any
function to set how much to read from the stream internally ?
I am not very comfortable with read and readsome , to load a large
buffer, as it changes the file position. While I need the visible file
position to be the position I am actually, while "internally " it
should read some more , may be like 1MB chunk ... ?
I'm not sure, but I think it's the other way around, Vim does not read
the whole file at once so it's faster.
Each ifstream has a buffer associated with it, you can get a pointer
to it with the rdbuf()-method and you can specify an array to use as
buffer with the pubsetbuf()-method. See the following link for a short
example:http://www.cplusplus.com/reference/i...pubsetbuf.html
--
Erik Wikström
Hi,
I had checked it in a separate console project (multi threaded ) it
is running perfectly, and reads within .8 sec. However the same code
takes 12 sec when running inside my Qt app.
I fear Qt lib is interacting with c++ runtime is some way to cause the
problem ....
May be I need to build the Qt lib a fresh to check what is wrong.
Thanks for answering the question ....
Make sure you decouple stream I/O from stdio, i.e. do
std::ios::sync_ with_stdio(fals e);
HTH,
- J/
"Jacek Dziedzic" <ja************ ************@gm ail.comwrote in message
news:e3******** *************** ****@news.chell o.pl...
toton wrote:
>On Feb 19, 5:44 pm, "Erik Wikström" <eri...@student .chalmers.se>
wrote:
>>On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
Hi,
I am reading some large text files and parsing it. typical file size
I am using is 3 MB. It takes around 20 sec just to use std::getline (I
need to treat newlines properly ) for whole file in debug , and 8 sec
while optimization on.
It is for Visual Studio 7.1 and its std library. While vim opens it
in a fraction of sec.
So, is it that getline is reading the file line by line, instead
reading a chunk at a time in its internal buffer? is there any
function to set how much to read from the stream internally ?
I am not very comfortable with read and readsome , to load a large
buffer, as it changes the file position. While I need the visible file
position to be the position I am actually, while "internally " it
should read some more , may be like 1MB chunk ... ?
I'm not sure, but I think it's the other way around, Vim does not read
the whole file at once so it's faster.
Each ifstream has a buffer associated with it, you can get a pointer
to it with the rdbuf()-method and you can specify an array to use as
buffer with the pubsetbuf()-method. See the following link for a short
example:http://www.cplusplus.com/reference/i...pubsetbuf.html
--
Erik Wikström
Hi,
I had checked it in a separate console project (multi threaded ) it
is running perfectly, and reads within .8 sec. However the same code
takes 12 sec when running inside my Qt app.
I fear Qt lib is interacting with c++ runtime is some way to cause the
problem ....
May be I need to build the Qt lib a fresh to check what is wrong.
Thanks for answering the question ....
Make sure you decouple stream I/O from stdio, i.e. do
std::ios::sync_ with_stdio(fals e);
Normally good advice, but unnecessary with VC++.
P.J. Plauger
Dinkumware, Ltd. http://www.dinkumware.com
On Feb 19, 8:49 pm, "P.J. Plauger" <p...@dinkumwar e.comwrote:
"Jacek Dziedzic" <jacek.dziedzic .n.o.s.p....@gm ail.comwrote in message
news:e3******** *************** ****@news.chell o.pl...
toton wrote:
On Feb 19, 5:44 pm, "Erik Wikström" <eri...@student .chalmers.se>
wrote:
On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
>>Hi,
I am reading some large text files and parsing it. typical file size
I am using is 3 MB. It takes around 20 sec just to use std::getline (I
need to treat newlines properly ) for whole file in debug , and 8 sec
while optimization on.
It is for Visual Studio 7.1 and its std library. While vim opens it
in a fraction of sec.
So, is it that getline is reading the file line by line, instead
reading a chunk at a time in its internal buffer? is there any
function to set how much to read from the stream internally ?
I am not very comfortable with read and readsome , to load a large
buffer, as it changes the file position. While I need the visible file
position to be the position I am actually, while "internally " it
should read some more , may be like 1MB chunk ... ?
I'm not sure, but I think it's the other way around, Vim does not read
the whole file at once so it's faster.
>Each ifstream has a buffer associated with it, you can get a pointer
to it with the rdbuf()-method and you can specify an array to use as
buffer with the pubsetbuf()-method. See the following link for a short
example:http://www.cplusplus.com/reference/i...pubsetbuf.html
>--
Erik Wikström
Hi,
I had checked it in a separate console project (multi threaded ) it
is running perfectly, and reads within .8 sec. However the same code
takes 12 sec when running inside my Qt app.
I fear Qt lib is interacting with c++ runtime is some way to cause the
problem ....
May be I need to build the Qt lib a fresh to check what is wrong.
Thanks for answering the question ....
Make sure you decouple stream I/O from stdio, i.e. do
std::ios::sync_ with_stdio(fals e);
Normally good advice, but unnecessary with VC++.
P.J. Plauger
Dinkumware, Ltd.http://www.dinkumware.com
I got the problem. It has nothing to do with Qt or other
libraries ....
I was using a tellg() to get the current position. Now my question is
why tellg is such costly ? Won't it just return the current strem
position ?
To explain,
{
boost::progress _timer t;
std::ifstream in("Y:/Data/workspaces/tob4f/tob4f.dat");
std::string line;
while(in){
///int pos = in.tellg();
std::getline(in ,line);
}
}
This code takes 0.58 sec in my computer while if I uncomment the line
in.tellg(), it takes 120.8 sec !
toton wrote:
On Feb 19, 8:49 pm, "P.J. Plauger" <p...@dinkumwar e.comwrote:
>"Jacek Dziedzic" <jacek.dziedzic .n.o.s.p....@gm ail.comwrote in message
news:e3******* *************** *****@news.chel lo.pl...
>>toton wrote:
On Feb 19, 5:44 pm, "Erik Wikström" <eri...@student .chalmers.se>
wrote:
On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
>Hi,
> I am reading some large text files and parsing it. typical file size
>I am using is 3 MB. It takes around 20 sec just to use std::getline (I
>need to treat newlines properly ) for whole file in debug , and 8 sec
>while optimization on.
> It is for Visual Studio 7.1 and its std library. While vim opens it
>in a fraction of sec.
> So, is it that getline is reading the file line by line, instead
>reading a chunk at a time in its internal buffer? is there any
>function to set how much to read from the stream internally ?
> I am not very comfortable with read and readsome , to load a large
>buffer, as it changes the file position. While I need the visible file
>position to be the position I am actually, while "internally " it
>should read some more , may be like 1MB chunk ... ?
I'm not sure, but I think it's the other way around, Vim does not read
the whole file at once so it's faster.
Each ifstream has a buffer associated with it, you can get a pointer
to it with the rdbuf()-method and you can specify an array to use as
buffer with the pubsetbuf()-method. See the following link for a short
example:http://www.cplusplus.com/reference/i...pubsetbuf.html
--
Erik Wikström
Hi,
I had checked it in a separate console project (multi threaded ) it
is running perfectly, and reads within .8 sec. However the same code
takes 12 sec when running inside my Qt app.
I fear Qt lib is interacting with c++ runtime is some way to cause the
problem ....
May be I need to build the Qt lib a fresh to check what is wrong.
Thanks for answering the question ....
Make sure you decouple stream I/O from stdio, i.e. do
std::ios::syn c_with_stdio(fa lse);
Normally good advice, but unnecessary with VC++.
P.J. Plauger
Dinkumware, Ltd.http://www.dinkumware.com
I got the problem. It has nothing to do with Qt or other
libraries ....
I was using a tellg() to get the current position. Now my question is
why tellg is such costly ? Won't it just return the current strem
position ?
To explain,
{
boost::progress _timer t;
std::ifstream in("Y:/Data/workspaces/tob4f/tob4f.dat");
std::string line;
while(in){
///int pos = in.tellg();
std::getline(in ,line);
}
}
This code takes 0.58 sec in my computer while if I uncomment the line
in.tellg(), it takes 120.8 sec !
Could it be that you have opened the file in text mode and the tellg()
seeks to beginning always and rereads characters (counting cr+lf pairs
as one ). Try switching to binary mode and handle cr+lf yourself.
ismo
On Feb 20, 11:10 am, Ismo Salonen <nob...@another .invalidwrote:
toton wrote:
On Feb 19, 8:49 pm, "P.J. Plauger" <p...@dinkumwar e.comwrote:
"Jacek Dziedzic" <jacek.dziedzic .n.o.s.p....@gm ail.comwrote in message
>news:e3******* *************** *****@news.chel lo.pl...
>toton wrote:
On Feb 19, 5:44 pm, "Erik Wikström" <eri...@student .chalmers.se>
wrote:
On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
Hi,
I am reading some large text files and parsing it. typical file size
I am using is 3 MB. It takes around 20 sec just to use std::getline (I
need to treat newlines properly ) for whole file in debug , and 8 sec
while optimization on.
It is for Visual Studio 7.1 and its std library. While vim opens it
in a fraction of sec.
So, is it that getline is reading the file line by line, instead
reading a chunk at a time in its internal buffer? is there any
function to set how much to read from the stream internally ?
I am not very comfortable with read and readsome , to load a large
buffer, as it changes the file position. While I need the visible file
position to be the position I am actually, while "internally " it
should read some more , may be like 1MB chunk ... ?
I'm not sure, but I think it's the other way around, Vim does not read
the whole file at once so it's faster.
Each ifstream has a buffer associated with it, you can get a pointer
to it with the rdbuf()-method and you can specify an array to use as
buffer with the pubsetbuf()-method. See the following link for a short
example:http://www.cplusplus.com/reference/i...pubsetbuf.html
--
Erik Wikström
Hi,
I had checked it in a separate console project (multi threaded ) it
is running perfectly, and reads within .8 sec. However the same code
takes 12 sec when running inside my Qt app.
I fear Qt lib is interacting with c++ runtime is some way to cause the
problem ....
May be I need to build the Qt lib a fresh to check what is wrong.
Thanks for answering the question ....
Make sure you decouple stream I/O from stdio, i.e. do
std::ios::sync _with_stdio(fal se);
Normally good advice, but unnecessary with VC++.
P.J. Plauger
Dinkumware, Ltd.http://www.dinkumware.com
I got the problem. It has nothing to do with Qt or other
libraries ....
I was using a tellg() to get the current position. Now my question is
why tellg is such costly ? Won't it just return the current strem
position ?
To explain,
{
boost::progress _timer t;
std::ifstream in("Y:/Data/workspaces/tob4f/tob4f.dat");
std::string line;
while(in){
///int pos = in.tellg();
std::getline(in ,line);
}
}
This code takes 0.58 sec in my computer while if I uncomment the line
in.tellg(), it takes 120.8 sec !
Could it be that you have opened the file in text mode and the tellg()
seeks to beginning always and rereads characters (counting cr+lf pairs
as one ). Try switching to binary mode and handle cr+lf yourself.
ismo
The whole purpose of using getline is that only. I am not sure why
tellg have to behave like that in text mode , it is stored one !
Tested the same with gcc .The program in mingw is not giving any big
performance
difference.
here is the program
#include <fstream>
#include <iostream>
#include <ctime>
int main(){
{
//boost::progress _timer t;
time_t start,end;
time(&start);
std::ifstream in("Y:/Data/workspaces/tob4f/tob4f.dat");
std::string line;
while(in){
int pos = in.tellg();
std::getline(in ,line);
}
time(&end);
std::cout<<diff time(end,start) ;
}
}
With & without comment on the line , it takes 2 sec & 3 sec
respectively (without -o2 flag ) It looks fine to me ...
Even the visual studio std code looks quite simple one ....
anyone else has tested it with a big file (4-8 MB )and found a huge
difference ?
thanks
abir
On Feb 20, 7:45 am, "toton" <abirba...@gmai l.comwrote:
On Feb 20, 11:10 am, Ismo Salonen <nob...@another .invalidwrote:
toton wrote:
On Feb 19, 8:49 pm, "P.J. Plauger" <p...@dinkumwar e.comwrote:
>"Jacek Dziedzic" <jacek.dziedzic .n.o.s.p....@gm ail.comwrote in message
>>news:e3****** *************** ******@news.che llo.pl...
>>toton wrote:
>>>On Feb 19, 5:44 pm, "Erik Wikström" <eri...@student .chalmers.se>
>>>wrote:
>>>>On Feb 19, 12:44 pm, "toton" <abirba...@gmai l.comwrote:
>>>>>Hi,
>>>>> I am reading some large text files and parsing it. typical file size
>>>>>I am using is 3 MB. It takes around 20 sec just to use std::getline (I
>>>>>need to treat newlines properly ) for whole file in debug , and 8 sec
>>>>>while optimization on.
>>>>> It is for Visual Studio 7.1 and its std library. While vim opens it
>>>>>in a fraction of sec.
>>>>> So, is it that getline is reading the file line by line, instead
>>>>>reading a chunk at a time in its internal buffer? is there any
>>>>>function to set how much to read from the stream internally ?
>>>>> I am not very comfortable with read and readsome , to load a large
>>>>>buffer, as it changes the file position. While I need the visible file
>>>>>position to be the position I am actually, while "internally " it
>>>>>should read some more , may be like 1MB chunk ... ?
>>>>I'm not sure, but I think it's the other way around, Vim does notread
>>>>the whole file at once so it's faster.
>>>>Each ifstream has a buffer associated with it, you can get a pointer
>>>>to it with the rdbuf()-method and you can specify an array to useas
>>>>buffer with the pubsetbuf()-method. See the following link for a short
>>>>example:http://www.cplusplus.com/reference/i...pubsetbuf.html
>>>>--
>>>>Erik Wikström
>>>Hi,
>>> I had checked it in a separate console project (multi threaded )it
>>>is running perfectly, and reads within .8 sec. However the same code
>>>takes 12 sec when running inside my Qt app.
>>>I fear Qt lib is interacting with c++ runtime is some way to causethe
>>>problem ....
>>>May be I need to build the Qt lib a fresh to check what is wrong.
>>>Thanks for answering the question ....
>> Make sure you decouple stream I/O from stdio, i.e. do
>>std::ios::syn c_with_stdio(fa lse);
>Normally good advice, but unnecessary with VC++.
>P.J. Plauger
>Dinkumware, Ltd.http://www.dinkumware.com
I got the problem. It has nothing to do with Qt or other
libraries ....
I was using a tellg() to get the current position. Now my question is
why tellg is such costly ? Won't it just return the current strem
position ?
To explain,
{
boost::progress _timer t;
std::ifstream in("Y:/Data/workspaces/tob4f/tob4f.dat");
std::string line;
while(in){
///int pos = in.tellg();
std::getline(in ,line);
}
}
This code takes 0.58 sec in my computer while if I uncomment the line
in.tellg(), it takes 120.8 sec !
Could it be that you have opened the file in text mode and the tellg()
seeks to beginning always and rereads characters (counting cr+lf pairs
as one ). Try switching to binary mode and handle cr+lf yourself.
ismo
The whole purpose of using getline is that only. I am not sure why
tellg have to behave like that in text mode , it is stored one !
Tested the same with gcc .The program in mingw is not giving any big
performance
difference.
here is the program
#include <fstream>
#include <iostream>
#include <ctime>
int main(){
{
//boost::progress _timer t;
time_t start,end;
time(&start);
std::ifstream in("Y:/Data/workspaces/tob4f/tob4f.dat");
std::string line;
while(in){
int pos = in.tellg();
std::getline(in ,line);
}
time(&end);
std::cout<<diff time(end,start) ;
}}
With & without comment on the line , it takes 2 sec & 3 sec
respectively (without -o2 flag ) It looks fine to me ...
Even the visual studio std code looks quite simple one ....
anyone else has tested it with a big file (4-8 MB )and found a huge
difference ?
On a 22.5MB file I get one second running time without tellg, 4
seconds if the file is opened in text mode and 2 seconds if opened in
binary mode. Seems quite reasonable to me.
--
Erik Wikström This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes...
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by: conductexam |
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I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert...
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by: TSSRALBI |
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Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in...
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by: muto222 |
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How can i add a mobile payment intergratation into php mysql website.
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