Question on output of memory profiling

<p>I just profiled a program of mine to see what functions are responsible for the most allocation (as the cpu profiling revealed that mallocgc was one of the top time hogs) and got this as the output:</p> <pre><code>runtime.oneNewExtraM /cs/local/lib/pkg/go-1.9.2/src/runtime/proc.go </code></pre> <p>As being responsible for 100% of the allocating. I would have expected to see one of my own functions in the top 5 or 10 at least. Does anyone know what might be causing oneNewExtraM to be handling all this allocation?</p> <hr/>**评论：**<br/><br/>dgryski: <pre><p>M&#39;s are real actual machine threads. Are you doing a lot of syscalls or cgo calls ?</p></pre>ConfuciusBateman: <pre><p>Hmm. Would using the md5 package potentially cause this? The Write and Sum methods get used a ton in about 25 goroutines that my program spawns. Would you recommend trying to go through my program and seeing what might be making syscalls/cgo calls?</p></pre>