I&#x27;ve identified a memory bandwidth issue in the past by keeping an eye on truss&#x2F;strace output and &quot;counting&quot; mem operations.<p>After that, I compiled and ran a tiny executable called Stream[1] and got the numbers I needed in order to explain why one machine was twice as slow as another.<p>[1] <a href="http:&#x2F;&#x2F;www.cs.virginia.edu&#x2F;stream&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.cs.virginia.edu&#x2F;stream&#x2F;</a>