debug Buildbot's memory use

[dustin]

I learned about a few tools at PyCon? that may be useful for this purpose. First, we should document these tools in the developer documentation so that others can work with them, too. Second, we should apply them in development to see if there are any low-hanging fruit in terms of memory consumption.

• sys.getsizeof (2.6 only)
• Meliae - dumps a reference graph in JSON
• gdb-heap - dumps the Python heap in GDB (mostly totals)

[catlee]

asizeof is also handy

[dustin]

I learned about socketconsole at this year's PyCon?, which gives you an external way to look at what each thread is doing at a given time.

[dustin]

Worth revisiting once nine is stable.