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Program runs too slowly with large input - C


Program runs too slowly with large input - C

By : MetinYakar.NET
Date : November 22 2020, 02:42 PM
To fix the issue you can do The goal for this program is for it to count the number of instances that two consecutive letters are identical and print this number for every test case. The input can be up to 1,000,000 characters long (thus the size of the char array to hold the input). The website which has the coding challenge on it, however, states that the program times out at a 2s run-time. My question is, how can this program be optimized to process the data faster? Does the issue stem from the large char array? , You don't need the line
code :
str[1000000] = "";
size_t len = strlen(str)-1;
for (a = 0; a < len; a++) {
    ...
}


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Java program runs smoothly in Netbeans but slowly in Eclipse and as an executable jar

Java program runs smoothly in Netbeans but slowly in Eclipse and as an executable jar


By : sangyye
Date : March 29 2020, 07:55 AM
it helps some times One of possible reasons may be that NetBeans can use one JVM, and Eclipse and terminal "java" command can use another. Look into what platform NetBeans uses for your project, and compare it with Eclipse.
Also there can be something with arguments you passed to JVM. Check that too.
Theories on how to make a quiet program? One that runs slowly in the background

Theories on how to make a quiet program? One that runs slowly in the background


By : user3454531
Date : March 29 2020, 07:55 AM
will help you In general, program is noticeable if it uses either CPU or disk. For CPU, you can decrease the process priority: nice(10) on Linux, SetPriorityClass(..._IDLE) on Windows.
For HDD, there is "ionice" on Linux, and I am not sure if anything exists on Windows. You might just have to rate-limit your disk reads and writes, if you have many of them.
Input stream reads large files very slowly, why?

Input stream reads large files very slowly, why?


By : UC Tanda
Date : March 29 2020, 07:55 AM
like below fixes the issue You should not flush in loop. You are using BufferedOutputStream. This mean that after "caching" some amount of data it flushes data to file. Your code just kills performance by flushing data after writing a little amount of data.
try do this like that:
code :
while((i = in.read(buffer)) != -1){
out.write(buffer, 0, i); <-- SLOW HERE
}
out.flush();
File dest = getDestinationFile(source, destination);
if(dest == null) return false;

in = new BufferedInputStream(new  FileInputStream(source));
out = new BufferedOutputStream(new  FileOutputStream(dest));

int i;
while((i = in.read()) != -1){
   out.write(i);
}
out.flush();
Program Runs Too Slowly

Program Runs Too Slowly


By : Ethan Yu
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Create a set() of words. Look up in set is O(1):
In this line create set:
code :
Dictionary = set(open("Sowpods.txt").read().splitlines())
How many tiles are in your rack? 7
Letter #1? d
Letter #2? e
Letter #3? f
Letter #4? g
Letter #5? a
Letter #6? f
Letter #7? e

[('D',), ('E',), ('F',), ('G',), ('A',), ('F',), ('E',), ...
DE-3
DA-3
DE-3
ED-3
EF-5
EA-2
EF-5
EE-2
...
Loading Elasticsearch via Logstash on large dataset runs very slowly

Loading Elasticsearch via Logstash on large dataset runs very slowly


By : Kamil
Date : March 29 2020, 07:55 AM
wish of those help You indicate 2 potential problems here:
slow mysql read slow elasticsearch write
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