Various crash consistency bugs for pslab memcached.

Memcached

Memcached is a high performance multithreaded event-based key/value cache store intended to be used in a distributed system.

See: https://memcached.org/about

A fun story explaining usage: https://memcached.org/tutorial

If you're having trouble, try the wiki: https://memcached.org/wiki

If you're trying to troubleshoot odd behavior or timeouts, see: https://memcached.org/timeouts

https://memcached.org/ is a good resource in general. Please use the mailing list to ask questions, github issues aren't seen by everyone!

Dependencies

libevent, http://www.monkey.org/~provos/libevent/ (libevent-dev)
libseccomp, (optional, linux) - enables process restrictions for better security.

Environment

Be warned that the -k (mlockall) option to memcached might be dangerous when using a large cache. Just make sure the memcached machines don't swap. memcached does non-blocking network I/O, but not disk. (it should never go to disk, or you've lost the whole point of it)

Website

http://www.memcached.org

Contributing

See https://github.com/memcached/memcached/wiki/DevelopmentRepos

	it->it_flags \|= ITEM_LINKED;
	pmem_member_persist(it, it_flags);
	it->time = current_time;
	pmem_member_persist(it, time);

	/* Allocate a new CAS ID on link. */
	ITEM_set_cas(it, (settings.use_cas) ? get_cas_id() : 0);

	if ((it->time <= oldest_live)
	\|\| (oldest_cas != 0 && cas != 0 && cas < oldest_cas)) {
	return 1;

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