mountd and rpcbind should use libumem(3lib)
The malloc(3c) from libc does not scale well for massively multithreaded applications.
It was found that with the stock mountd(1m) we could easily get thousands of mountd threads due to libc malloc(3c) inefficiency. The mountd(1m) becomes very slow, and could exhaust the whole virtual memory.
When the libumem(3lib) was preloaded to mountd, the mountd was able to handle the load well with less than 20 threads.
We should link mountd with libumem(3lib) by default.
The rpcbind(1m) should be linked by default with libumem(3lib) as well for similar reasons.