| function worker() { | |
| setInterval(function() { | |
| postMessage({foo: "bar"}); | |
| }, 1000); | |
| } | |
| var code = worker.toString(); | |
| code = code.substring(code.indexOf("{")+1, code.lastIndexOf("}")); | |
| var blob = new Blob([code], {type: "application/javascript"}); |
Other people's code is awful, and your own code from months previous counts as someone else's. With this and the festive spirit in mind, I dug up a canvas snow demo I made two years ago to see how bad my code really was.
Turns out the performance landscape has changed quite a bit, but after applying a couple of workarounds, best practices, and memory management, I got the demo running smoother than it ever did.
Ugh, I can't believe I just wrote "performance landscape". Anyway...
| 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 |
