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n n', cpu, node ) įor more interesting results, you could spin threads via the pthreads library and then call this function to see on which processor your thread is running. Printf ( 'This program is running on CPU core %u and NUMA node %u. Syscall (SYS_getcpu, &cpu, &node, NULL ) Note this has no glibc wrapper so we must call it directly Get current CPU core and NUMA node via system call In this code, we’ll call the getcpu() call directly via the syscall() function. This is an example of a system call that cannot be duplicated with glibc and isn’t covered with a glibc wrapper. What CPU Are We On?Ī question that most programs probably don’t think to ask, but a valid one nonetheless. Now that you’ve read the disclaimers, warnings, and potential detours, now let’s dig into some practical examples. If your copy of glibc is up to date, this will hardly be an issue, but developing on older distributions with newer kernels might require this technique. You can also use system calls to perform functions not yet supported by glibc. In that case, you’re best served with a system call.

Additionally, you may not want or need the extra features the wrapper provides. The wrapper that fread() provides is going to add overhead, and although minor, isn’t entirely transparent.

On the other hand, there are times where uncompromising performance and exact execution are critical. better error handling, formatted IO, etc.) and will work on any system glibc supports.

The glibc functions provide more features (i.e. For example, you can read a file with fscanf(), fread(), getc(), etc., or you can use the read() Linux system call. The glibc standard library provides a cross-platform, well-tested framework to execute functions that would otherwise require system-specific system calls. While it’s inevitable you’ll use a system call at some point in your C development career, unless you are targeting high performance or a particular type functionality, the glibc library and other basic libraries included in major Linux distributions will take care of the majority of your needs.

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