string copy performance test

Requests for assistance in person had known long ago, there was a chance to see the server program of the company. Report the contents of the program, so if the program would not do, we had the idea to keep the server.  There you cause that is causing the problem.

It had no time to look at all the sources of the problem, the problem itgetjiyo services freely to see the source of the other companies. So boatneundeyo at only source that caused the problem, the contents of which were written by the strcpy function immediately be caught in one eye.  To put a copy in every guild name strcpy function on your friends list in your user profile structure report, I would, make a copy in advance guild structure Guild Profile Guild Profiles database, player profile, friends list, I could have just simply link and we think. But I think the way to a revised relationship was not mentioned in the days to fix many of the program's source code.

The strcpy function which can be a problem with the first is that it can cause a serious program error.  Of course, you must use the strcpy function than strncpy function or strcpy_s function. Where is the program, or yeotdamyeon database fields had a string of a larger space than the space you want to copy an array or a null character has been lost state, strcpy raises a very serious problem. If you use the strncpy function, strangely enough, showing the end of an error.

 

copy memory at server

Second is the issue of the right performance. strcpy function has no choice but to continue to have the logic to test the null character is. Than always read every character, because the null character inspection by the if statement, increase the number of instructions to be performed and pipelines corruption issue exists.

 

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\0

The '\0' character plays a crucial role in strings by indicating the end of a string. Because of this, many programmers define strings as arrays with an additional space for the null terminator, for example:

char str[MAX_CHAR + 1];

In some cases, I do not add the +1 for the string termination character. Even without the extra space, such structures can generate meaningless padding, which might still be handled efficiently and safely.

When copying strings, it is recommended to use strncpy or memcpy instead of strcpy.
When formatting strings for output, use a format like "% .16s" to limit the string output and avoid including unintended data. Any unused part of the array will hold garbage values ('\0' or random data) that are meaningless in the context of program execution.

If you use strcpy or strncpy, the destination array might end up containing garbage values beyond the null terminator.
While memcpy does not inherently have such problems, it is generally considered safer in many cases. However, you must ensure that the source array is at least as large as the destination array to avoid undefined behavior.

Many programmers zero out the contents of an array after declaring it to enhance security.
Using memcpy will only clear the content from the source string, leaving other parts of the array unchanged. When using memcpy, ensure that the size of the source array matches or exceeds the size of the destination array to avoid errors or security risks.

Although minor mismatches in memory copying may not cause problems in small programs, they can lead to performance bottlenecks in server programs due to memory operations.
To prevent such issues, it is advisable to design programs to minimize unnecessary memory copying whenever possible.

Memory copying, while useful, can sometimes compromise structured program design.  It is important to always keep the design principles in mind and use memory copying judiciously to avoid degrading the program’s structure and performance.

Simple performance tests comparing the strncpy and memcpy functions demonstrate differences in their behavior and efficiency.
The choice between these functions depends on the program’s size, requirements, and the importance of security and performance.

 

results

 

 memcpy() C function is also carried out gradually increase the size in which you want to copy neuleonaneunde time, because the memory block is relatively inexpensive compared to the cost of the copy settings for copying costs. It can be seen that compared strncpy function is still growing.  Typically, the name of the game is to use a 16-byte or 32 bytes, if the trend of using Unicode, such as today will be a lot of 32 bytes. In this case, the use of memcpy function, the speed improvement comes in the strncpy used by approximately two-fold.  If such a case occurs and chat messages is nearly five times the speed difference. Look what I can see seem to use this result for granted.