* it should be possible to give the vm-max-memory option in megabyte, gigabyte, ..., just using 2GB, 100MB, and so forth.
* Make sure to wait all the IO threads are done before to fork() for BGSAVE and BGREWRITEAOF
* Enlarge the stack of threads, to problems when calling LZF lib.
+* redis-cli vmstat, calling INFO every second and printing VM stats ala vmstat.
VERSION 1.6 TODO (Virtual memory)
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