DRD is very similar to Helgrind, in that it also detects issues with threading and synchronization in the application. The main ways in which DRD differs from Helgrind are the following:

• DRD uses less memory
• DRD doesn't detect locking order violations
• DRD supports detached threads

Generally, one wants to run both DRD and Helgrind to compare the output from both with each other. Since a lot of potential issues are highly non-deterministic, using both tools generally helps to pinpoint the most serious issues.