https://blog.vnykmshr.com/writing/tags/dtrace/Recent content in Dtrace on vnykmshrHugoenSun, 14 Nov 2010 00:00:00 +0000https://blog.vnykmshr.com/writing/counting-malloc/Sun, 14 Nov 2010 00:00:00 +0000https://blog.vnykmshr.com/writing/counting-malloc/<p>The program is as fast as I know how to make it. The hot loops are tuned, the locks as fine-grained as the design allows, the slow paths read and re-read. It&rsquo;s still slower than it should be, and slow to start. The profiler keeps pointing at a name I&rsquo;ve been ignoring because it isn&rsquo;t mine: malloc.</p> <p>malloc holds a global lock, and in a multi-threaded program that lock is where the threads line up. You never wrote a line of it. The libraries you lean on allocate on paths you&rsquo;ve never read. You can&rsquo;t grep for it &ndash; the calls aren&rsquo;t in your code.</p>