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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
;; Determine if any of the causes of the exception was of the specified type | |
(defn exception-cause? [klass ^Throwable t] | |
(->> (iterate #(.getCause ^Throwable %) t) | |
(take-while identity) | |
(some (partial instance? klass)) | |
boolean)) |