Merge branch 'jh/memihash-opt'

perf-test update.

* jh/memihash-opt:
p0004: don't error out if test repo is too small
p0004: don't abort if multi-threaded is too slow
p0004: use test_perf
p0004: avoid using pipes
p0004: simplify calls of test-lazy-init-name-hash