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khoda
khoda
Last Activity: Dec 2 '09, 03:43 PM
Joined: Sep 18 '09
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  • khoda
    started a topic callgrind output
    in C

    callgrind output

    I ran callgrind on my program, collecting sysTime (what I think to be "time spent in system calls"). However, when I sort by self-cost under the sysTime metric, among the top scorers is memcpy. But, looking at the memcpy source, it doesn't seem to use any system calls. What's going on?
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    • khoda
      replied to definitions of compiler, standard library, standard template library, etc. (c++)
      in C
      Thanks for the reply, Banfa. I'm still a little confused.

      I understand that compiler writers can use a plethora of different optimization techniques. It seems that some compilers even have built-in functions (which seems to be distinct from the libraries they offer). Am I right in saying that each of these compilers will take any C++ file (with proper syntax and semantics) and compile it into a a binary file for some machine? Are their...
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      • khoda
        started a topic definitions of compiler, standard library, standard template library, etc. (c++)
        in C

        definitions of compiler, standard library, standard template library, etc. (c++)

        i'm getting a little confused with some terminology. it's hard to get all of these questions answered through google.

        please correct me if i make any mistakes in my assumptions when asking the following questions:

        i understand that there are many different compilers for c++. among them is the gnu c++ compiler, part of the gnu compiler collection (gcc). from my understanding, a compiler has a set of rules for syntax and...
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        • khoda
          started a topic bash script to run program N times
          in Linux

          bash script to run program N times

          wasn't sure what forum to put this in, but I'm sure someone here can help me.

          I have a program that I want to run N times. I'd like to make a bash script that, when run like this:

          ./script.sh 5

          will run my program 5 times, where my program can be run like this:

          ./myprogram

          Basically I just need a loop that will execute my program, then iterate when the execution exits. ...
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          • khoda
            replied to Using __pool_alloc or some other allocator?
            in C
            Thanks weaknessforcats . That strategy makes sense, but I'm looking for the allocator to do this for me. I'm assuming __pool_alloc does this, though some other allocator may do this better.

            My question is: Is __pool_alloc what I'm looking for? If so, how do I use it?
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            • khoda
              started a topic Using __pool_alloc or some other allocator?
              in C

              Using __pool_alloc or some other allocator?

              Let’s say I have a hash map from strings to a user-defined object of type X. Thoughout the lifetime of my program, I have millions of these objects allocated/free’d. A friend mentioned that I look into some kind of allocator that will save the ‘template’ of my objects when I free, so that I don’t have to incur the additional heap-searching overhead to allocate my next object. I read something about the __pool_alloc but it is unclear to...
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