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Unable to read large log file with MemoryMappedViewStream


Unable to read large log file with MemoryMappedViewStream

By : Joost Kranenborg
Date : October 20 2020, 08:10 AM
wish help you to fix your issue A memory mapped view stream is a stream over a memory mapped view. It does not provide a stream on the whole file, but just the part that you map. You will still need to map the file in chunks to read the whole thing. Unless you really need shared memory you are probably just better off with reading the file in chunks.
code :


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C++ : Unable to read from large txt file

C++ : Unable to read from large txt file


By : user2431052
Date : March 29 2020, 07:55 AM
I hope this helps you . Your problem is in the merge function:
you exceed the local variable c.
code :
#include <map>
#include <vector>
#include <fstream> 
#include <iostream> 
#include <time.h>
using namespace std;

void merge(vector<long> &,long ,long , long );


void divide(vector<long> &arr,long min, long max){
    long mid;

    if(min<max){
        mid=(min+max)/2;
        if(min != mid) divide(arr,min,mid);
        if(max != mid+1) divide(arr,mid+1,max);
        merge(arr,min,mid,max);
    }
    return;

}

void merge(vector<long> &arr,long min, long mid,long max){
    long i,j,k;
    map<long,long> c; //uses map because the vector not always start from 0
    //other option is to use vector<long> c(max-min) and substruct min when copy to/from it.
    //like this: vector<long> c(1+max-min); //initialize size = max-min+1
    //           c[k-min] = arr[i];
    //           arr[i] = c[i-min];
    i=min,j=mid+1;
    k=min;

    while(i<=mid && j<=max){
        if(arr[i]<arr[j]){
            c[k]=arr[i];
            i++;
            k++;
        }
        else{
            c[k]=arr[j];
            j++;
            k++;
        }
    }
    while(i<=mid){
        c[k]=arr[i];
        i++;
        k++;
    }
    while(j<=max){
        c[k]=arr[j];
        j++;
        k++;
    }

    for(long i=min;i<=max;i++)
        arr[i]=c[i];
}

void create_input(int i){
    srand(time(NULL));
    ofstream fout("sample2.txt");
    while(i--){
        fout<<rand()<<" ";
    }
} 

int main(){

    vector<long> data;
    long tmp;
    long count=0;
    //create random input
    //create_input(31);

    ifstream fin("sample2.txt");

    while(fin >> tmp)
    {
        data.push_back(tmp);
        count++;//count = data.size(); !!
    }
    cout<<"the unsorted array is\n";
    for(long i=0;i<count;i++)
        cout<<i<<"]\t"<<data[i]<<"\n";

    divide(data,0,count-1);//use last index not size

    cout<<"the sorted array is\n";
    for(long i=0;i<count;i++)
        cout<<i<<"]\t"<<data[i]<<"\n";


    return 0;
}
unable to read large bz2 file

unable to read large bz2 file


By : user3272074
Date : March 29 2020, 07:55 AM
wish of those help Your file.read() call tries to read and decompress the entire file into memory at once. Try reading it a line at a time:
code :
import bz2

with bz2.BZ2File("20150219.csv.bz2", "r") as file:
    for line in file:
        print line
Unable to a read a large file using BufferedReader in Java

Unable to a read a large file using BufferedReader in Java


By : user3598005
Date : March 29 2020, 07:55 AM
may help you . You're using the platform default encoding to read the file, which is probably encoded in UTF8. Check the actual encoding of the file, and specify the encoding:
code :
BufferedReader r = new BufferedReader(new InputStreamReader(new FileInputStream("...", StandardCharsets.UTF_8));
String json = new String(Files.readAllBytes(...), StandardCharsets.UTF_8);
How to handle processing large csv file or read large CSV file in chunks

How to handle processing large csv file or read large CSV file in chunks


By : Thakgatso. Lekoadi
Date : March 29 2020, 07:55 AM
wish helps you The enhanced for loop (for (MyObject myObject : myObjects)) is implemented using the Iterator (it requires that the instance returned by csv.parse(strat, getReader("file.txt")) implements the Iterable interface, which contains an iterator() method that returns an Iterator), so there's no performance difference between the two code snippets.
P.S
code :
Iterator<MyObject> myObjects = csv.parse(strat, getReader("file.txt")).iterator();

while (myObjects.hasNext()) {
    MyObject myObject = myObjects.next();
    System.out.println(myObject);
}
Unable to read large file of Network shared folder

Unable to read large file of Network shared folder


By : Joel Burt
Date : March 29 2020, 07:55 AM
help you fix your problem I am trying to read the text file to check whether all the rows has same number of columns or not. In local code its working fine but on the Network shared folder (has permission as Everyone) it is working only for small size (5mb) of file and when I am selecting 10 MB or 500 MB file same code is not working (Not working means, it takes some time but after few minutes page gets refresh, that's it). It is not giving any error or showing any message. Below is the code to read the file and get the columns count , I have added AsyncPostBackTimeout="36000" which solved my problem.
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