BeeOnRope

BeeOnRope has asked 300 questions and find answers to 289 problems.

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Performance Matters

BeeOnRope questions

Can I ask the kernel to populate (fault in) a range of anonymous pages?
Convention for displaying vector registers
Loading an xmm from GP regs
ByteBuffer.putLong ~2x faster with non-native ByteOrder
In modern Linux x86-64 is it safe for userspace to overwrite the GS register?
Does the llvm-bolt instrumentation mode result in less accurate BOLT profiles?
Bring code into the L1 instruction cache without executing it
Emplacement-like construction for std::vector
Randomized testing in Java
Using the perf events from perf list programatically

BeeOnRope answers

Can I ask the kernel to populate (fault in) a range of anonymous pages?
Will gettimeofday() be slowed due to the fix to the recently announced Intel bug?
Code alignment in one object file is affecting the performance of a function in another object file
Cache friendly offline random read
How to maintain a persistent background thread?
Does the llvm-bolt instrumentation mode result in less accurate BOLT profiles?
First use of AVX 256-bit vectors slows down 128-bit vector and AVX scalar ops
"perf" - count instructions per method
tryLock() in a loop?
Fastest way to set a single memory cell to zero or a constant in x86 assembly?