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Twemcache is the Twitter Memcached

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add some metrics for memory statistic. current heap memory usage, current hashtable size and connection buffer usage.

Add linux accept4() support.

Hi @thinkingfish On my laptop, build.sh can't resolve https://artifactory.twitter.biz, maybe it's an internal url. So build.sh can't download musl, and the same to libevent-2.0.22-stable.tar.gz Thanks

original codes are from here: https://github.com/twitter/twemcache/blob/master/src/mc_util.c ``` cpp bool mc_strtoll(const char *str, int64_t *out) { char *endptr; long long ll; errno = 0; *out = 0LL; ll = std::strtoll(str, &endptr,...

In wake of recent memcached amplification problems https://blog.cloudflare.com/memcrashed-major-amplification-attacks-from-port-11211/ it makes sense to disable UDP support. The code of twemcache seem to be created in a way to require UDP binding...

https://github.com/twitter/twemcache/blob/82c5d80e66a3c645b09721b3d78ef3aaf83902a8/src/mc.c#L115

I see that you've invested a lot of time in stackable Eviction Strategies. That's good for me, because that means, that you've already made the first step : admitted that...