I do occasionally run the whole Sage testsuite under valgrind's memcheck and it takes about a day to finish when skipping memcheck on all external executables. In the 2.9.0->2.9.1 release cycle I fixed 3 memory leaks, one of them in the graph code when converting arbitrary precision numbers to string representation in base 2. Since that function is called quite often when reading or writing adjacency matrices it can be quite a pain. The other two were relatively minor.
But the reason to run memcheck on the test suite was to find and fix all known memory leak issues before the 2.9.2 release. But I have been unable to fix two issues:
- LinBox leaks via Givaro in certain situations, for example when computing characteristic polynomials over certain fields. Clement Pernet and I did investigate the issue during Sage Days 6, but so far we haven't found a solution. Since it is relatively minor, especially compared to the memory leaks we already fixed in LinBox it has been somewhat on the back burner.
- The padic doctests leak tremendous amounts of memory. One doctest leaks more than 50 MBytes of memory. That is clearly unacceptable and would make long term computation involving padics nearly impossible. But so far I have been unable to figure out why the code, especially the __pow__ methods are leaking. I attacked the problem with memcheck as well as omega and omega points to some auto-generated Cython code, which is always a bad sign. I guess I need to bother Robert Bradshaw about this :)
Oh well, some times it just takes time to figure it all out. Then one has to wonder why it took so long to see the obvious.