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needs more testing. in a "pure miss" test to help show hashing overhead,
with four worker threads and large ascii multigets there is a measurable
performance boost for longer keys. Very short keys (10-15 bytes) are
about even.
for 150ish byte keys 12m rps -> 13m rps roughly. Not too bad!
need to test hash table distribution for large sets of keys before
merging. need to consider if worth switching the defaults now or later.
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On gcc-10 (and gcc-9 -fno-common) build fails as:
```
gcc -g -O2 -pthread -pthread -Wall -Werror -pedantic -Wmissing-prototypes \
-Wmissing-declarations -Wredundant-decls -o memcached ... -levent
ld: memcached-hash.o:memcached/hash.h:5:
multiple definition of `hash'; memcached-memcached.o:memcached/hash.h:5: first defined here
```
gcc-10 will change the default from -fcommon to fno-common:
https://gcc.gnu.org/PR85678.
The error also happens if CFLAGS=-fno-common passed explicitly.
Reported-by: Brian Evans
Bug: https://bugs.gentoo.org/706196
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
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jenkins hash is old. Lets try murmur3 to start! Default is the old one, so
people aren't surprised.
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