#general
- b
bored-art-40741
09/08/2015, 9:47 PMSo maybe guava is doing its own magic behind the scenes - b
bored-art-40741
09/08/2015, 9:48 PMGiven that it has an entry to the reference, seems like it's doing its own reference counting - e
enough-analyst-54434
09/08/2015, 9:48 PM - e
enough-analyst-54434
09/08/2015, 9:48 PMWell, strong reference to a SoftReference - e
enough-analyst-54434
09/08/2015, 9:48 PMI'm still suspicious of == misses on cache cleanup - e
enough-analyst-54434
09/08/2015, 9:49 PMthere were many threads on the gotcha's of not implementing == and the MapMaker then CacheBuilder and soft/weak keys and values - e
enough-analyst-54434
09/08/2015, 9:50 PMwhere == is java == or scala eq - and not implementing, but respecting - b
bored-art-40741
09/08/2015, 9:56 PMhm - w
witty-crayon-22786
09/08/2015, 9:58 PMthere are two dimensions here as well - w
witty-crayon-22786
09/08/2015, 9:59 PMthose are soft references, but there is also a cap on the total count - b
bored-art-40741
09/08/2015, 9:59 PMWhat's the default cap? - w
witty-crayon-22786
09/08/2015, 9:59 PMyou've set it to 1000 - b
bored-art-40741
09/08/2015, 9:59 PMAh, that's this cache - w
witty-crayon-22786
09/08/2015, 9:59 PMso it's possible that they're buggy, but the cap has saved us so far - b
bored-art-40741
09/08/2015, 9:59 PMI see 2500 in memory - w
witty-crayon-22786
09/08/2015, 10:00 PMright, but that does not account for those strongly held by an ongoin compile - b
bored-art-40741
09/08/2015, 10:00 PMSomething like 1300 in the cache, but that's an upper bound - b
bored-art-40741
09/08/2015, 10:00 PMYeah - w
witty-crayon-22786
09/08/2015, 10:00 PMso: maybe set that limit to a ridiculously high number - w
witty-crayon-22786
09/08/2015, 10:00 PMand see whether anything is collected - w
witty-crayon-22786
09/08/2015, 10:01 PMalternatively, use a profiler that makes it clearer what is going on - b
bored-art-40741
09/08/2015, 10:01 PMSetting to 100k - e
enough-analyst-54434
09/08/2015, 10:03 PMInteresting stuff from a jvm memory master: http://jeremymanson.blogspot.com/2009/07/how-hotspot-decides-to-clear_07.html soft references held until 1 GC after last access - e
enough-analyst-54434
09/08/2015, 10:03 PMAre you getting frequent GCs or O(1) - b
bored-art-40741
09/08/2015, 10:03 PMWhen this OOM happens there are no GCs - b
bored-art-40741
09/08/2015, 10:03 PMIt's just sitting right at the heap limit and struggling - w
witty-crayon-22786
09/08/2015, 10:04 PMhm - w
witty-crayon-22786
09/08/2015, 10:04 PMwhen it "struggles", it is GC'ing - e
enough-analyst-54434
09/08/2015, 10:04 PMDo you hav gclog turned on? - e
enough-analyst-54434
09/08/2015, 10:04 PMIt would be interesting to compare Twitter and Foursquare gc settings