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At least FreeBSD has perl in /usr/local/bin/perl and no symlink by
default.
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item might get pushed back out as we keep doing work. also use the move
counter instead of static number, in case of timing goofups pushing the warm
item back out.
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OS X test runs seem to run the maintainer thread either at a low priority, or
take long enough to bootstrap that it gets into a high sleep backoff... and
the test has some racy bits.
now, wait for some juggles to happen to ensure the canary value gets rescued.
fixes #380
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Tests have randomly failed to start since the beginning of time, due largely
to port assignment. A random local port is tested, then passed onto the daemon
to try. If that port (on 0.0.0.0) becomes used in the meantime, it fails.
Now, tests default to using unix sockets unique to the pid of the test parent.
Some tests still run via the network and have been changed to 127.0.0.1, which
should collide less with normal internet connections. Some tests require that
due to some timing issues that unix sockets seem to create, and others expect
a network in a few cases.
Ran the tests with `PARALLEL=9 make test` on my machine for two hours and they
didn't fail once.
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ITEM_FETCHED and ITEM_ACTIVE are now tracked separately. This also ensures
these flags are added only when an item would normally be bumped (previously
and INCR/DECR, failed store, etc could do it.
The original segmented LRU papers require two hits to be considered frequently
accessed. It's not completely clear if the initial cache miss counts as a hit
in the papers but increasing the frequency required to reach WARM still helps.
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Confident the other feature was never used; and if someone wants it, it's easy
to restore by allowing exptime of 0 to go into TEMP_LRU.
This could possibly become a default, or at least recommended.
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This test is requiring that the juggler thread runs at all before the stats
check happens. I've tried running this under an rPi1 and can't reproduce the
race, but for some reason solaris amd64 does. This is likely due to the usleep
not working as expected.
Unfortunately I don't have direct access to a solaris host, so this is the
best I can do for now. The juggler does eventually wake up so I'm unconcerned.
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When enabled, items with an expiration time of 0 are placed into a separate
LRU and are not subject to evictions. This allows a mixed-mode instance where
you can have a stronger "guarantee" (not a real guarantee) that items aren't
removed from the cache due to low memory.
This is a dangerous option, as mixing unevictable items has obvious
repercussions.
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this did actually discover the bug in the previous commit..
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