dpsanders

Latency Comparison Numbers
--------------------------
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

dpsanders

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Last Update: 12.12.2014
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dpsanders

function getmxcsr()
    Base.llvmcall("""%ptr = alloca i32
                  call void @llvm.x86.sse.stmxcsr(i32 * %ptr)
                  %curval = load i32 * %ptr
                  ret i32 %curval""", UInt32, ())
end

function setmxcsr(u::UInt32)
    Base.llvmcall("""%ptr = alloca i32
                  store i32 %0, i32 * %ptr