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OSBench

This is a collection of benchmarks that aim to measure the performance of operating system primitives, such as process and thread creation.

Building

To build the benchmarks you need a C compiler, meson and ninja.

mkdir out
cd out
meson --buildtype=release ../src
ninja

Micro benchmarks

All benchmarks run their work for five seconds, and the fastest pass is reported.

create_threads

Create 100 threads and wait for them to finish. Each thread does nothing (just return).

  • POSIX: pthread_create(), pthread_join()
  • WIN32: _beginthreadex(), WaitForSingleObject(), CloseHandle()

create_processes

Create 100 processes and wait for them to finish. Each process does nothing (just exit).

  • Unix: fork(), waitpid()
  • WIN32: Not implemented (Windows lacks the corresponding functionality).

launch_programs

Launch 100 programs and wait for them to finish. Each program does nothing (just exit).

  • Unix: fork(), execlp(), waitpid()
  • WIN32: CreateProcess(), WaitForSingleObject(), CloseHandle()

create_files

Create 65,534 files, write 32 byts of data to each file, and then delete them.

  • fopen(), fwrite(), fclose(), remove()

NOTE: To measure filesystem/kernel performance rather than storage medium performance, consider using a RAM disk.

mem_alloc

Allocate 1,000,000 small chunks of memory, and then free them. Each chunk is 4-128 bytes in size.

  • malloc(), free()