2014-11-04 6:35 GMT+08:00 Nico Erfurth <n...@erfurth.eu>: > > Well, the first thing you should ask yourself is "Do I REALLY need such > a large bloom filter". Everything larger than the last level cache will > seriously harm your performance as you are going to trigger a lot of > cache and TLB misses. In general you should target for typical L1-Cache > sizes (16-32KByte) or if REALLY necessary L2-Cache-sizes > (256KByte-32MByte). Everything above that will make the performance go > down rapidly, especially in hashing-application the CPU can't prefetch > data properly as the access-patterns are erratic. >
I didn't think of things like cache and TLB misses. Because I try to use BloomFilter and HASH to avoid repeated calculation and/or lookups which are time consuming. So, I don't think it will harm performance, unless bloom filter lookup is slower than the calculation, am I right? Thanks!
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