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README
perf
Low-level performance measurement for haskell using the rdtsc register on x86.
metal speed
The average cycles per (+) operation can get down to 0.7, and there are about 4 cache registers per cycle, so 2.8 low level instructions per (+). Is this close to the metal speed?
cache cycle estimates
| Cache | Cycles |
|---|---|
| register | 4 per cycle |
| L1 Cache access | 3-4 cycles |
| L2 Cache access | 11-12 cycles |
| L3 unified access | 30 - 40 |
| DRAM hit | 195 cycles |
| L1 miss | 40 cycles |
| L2 miss | >600 cycles |
Profiling
https://www.tweag.io/blog/2020-01-30-haskell-profiling/
hp2pretty
threadscope
https://stackoverflow.com/questions/32123475/profiling-builds-with-stack
https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/profiling.html
mkdir -p .stack-bin
stack clean
stack install --work-dir .stack-work-profile --profile --local-bin-path .stack-bin --ghc-options=-fno-prof-auto
stack exec --profile -- example +RTS -p -hc -s
stack exec -- hp2ps -c example.hp && ps2pdf example.ps
stack exec ghc-prof-flamegraph -- example.prof
memory checks
hp2ps -e8in -c examples.hp
hp2ps -e8in -c examples.hy # types
hp2ps -e8in -c examples.hp # constructors
stack exec example -- +RTS -s - additional memory
stack exec example -- +RTS -xt -hy