BeeOnRope

BeeOnRope has asked 297 questions and find answers to 287 problems.

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Performance Matters

BeeOnRope questions

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
Define an assert which is effective even if NDEBUG is defined
Efficiently dividing unsigned value by a power of two, rounding up
What's up with gcc's handling of alloca?

BeeOnRope answers

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?
How do I calculate memory bandwidth on a given (Linux) system, from the shell?
Intel FMA Instructions Offer Zero Performance Advantage