stress test main

Signed-off-by: Tim Henderson <tim.tadh@gmail.com>
varchar list block run allocation optimization

Signed-off-by: Tim Henderson <tim.tadh@gmail.com>
performance improvements for reading runs

Signed-off-by: Tim Henderson <tim.tadh@gmail.com>
optimized linhash.bucket.(*BlockTable)._records

Signed-off-by: Tim Henderson <tim.tadh@gmail.com>
added persistability to lru cache

Signed-off-by: Tim Henderson <tim.tadh@gmail.com>
reduced run size

Signed-off-by: Tim Henderson <tim.tadh@gmail.com>