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Benchmark realloc growth strategies
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library(ggplot2) | |
library(plyr) | |
library(dplyr) | |
data <- read.csv('realloc_bench.csv')[ ,c('growth_factor', 'time_in_us')] | |
data$growth_factor <- factor(data$growth_factor) | |
p <- ggplot(data, aes(x=growth_factor, y=time_in_us, fill=growth_factor)) + geom_boxplot() | |
ggsave("grow_timings.png", p) | |
data <- read.csv('realloc_bench.csv')[ ,c('growth_factor', 'reloc_ratio')] | |
data$growth_factor <- factor(data$growth_factor) | |
p <- ggplot(data, aes(x=growth_factor, y=reloc_ratio, fill=growth_factor)) + geom_boxplot() | |
ggsave("grow_relocr.png", p) | |
data <- read.csv('realloc_bench.csv')[ ,c('growth_factor', 'total_reloc')] | |
data$growth_factor <- factor(data$growth_factor) | |
p <- ggplot(data, aes(x=growth_factor, y=total_reloc, fill=growth_factor)) + geom_boxplot() | |
ggsave("grow_treloc.png", p) |
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import core.checkedint : mulu; | |
import core.stdc.stdlib; | |
import std.datetime : AutoStart, Duration, StopWatch; | |
import std.meta; | |
import std.numeric : gcd; | |
import std.random; | |
import std.stdio; | |
struct Array(T, alias ReallocPolicy) | |
{ | |
void push(T t) | |
{ | |
auto oldptr = ptr; | |
ptr = realloc.reserve(ptr, len + 1); | |
if (ptr != oldptr) | |
relocs += len; | |
ptr[len++] = t; | |
} | |
~this() | |
{ | |
free(ptr); | |
} | |
@disable this(this); | |
T* ptr; | |
size_t len; | |
size_t relocs; | |
ReallocPolicy!T realloc; | |
} | |
template ExpGrowth(size_t ExpNum, size_t ExpDen) if (ExpNum > ExpDen) | |
{ | |
enum Div = gcd(ExpNum, ExpDen); | |
enum Num = ExpNum / Div; | |
enum Den = ExpDen / Div; | |
struct ExpGrowth(T) | |
{ | |
T* reserve(T* ptr, size_t nlen) | |
{ | |
return nlen > cap ? grow(ptr, nlen) : ptr; | |
} | |
private: | |
T* grow(T* ptr, size_t nlen) | |
{ | |
bool overflow; | |
cap = mulu(cap, Num / Den, overflow) + mulu(cap, Num % Den, overflow) / Den; | |
if (overflow) | |
assert(0, "capacity computation overflowed"); | |
if (cap < nlen) | |
cap = nlen; | |
cap += -cap & 15; | |
return cast(T*) realloc(ptr, cap * T.sizeof); | |
} | |
size_t cap; | |
} | |
} | |
struct ReallocInternalGrowth(T) | |
{ | |
T* reserve(T* ptr, size_t nlen) | |
{ | |
bool overflow; | |
immutable sz = mulu(nlen, T.sizeof, overflow); | |
if (overflow) | |
assert(0, "capacity computation overflowed"); | |
return cast(T*) realloc(ptr, sz); | |
} | |
} | |
struct Dummy | |
{ | |
ubyte[32] payload; | |
} | |
void runLoop(bool print) | |
{ | |
foreach (num; AliasSeq!(11, 12, 13, 14, 15, 16, 17, 18, 19, 20)) | |
{ | |
auto rng = Random(1234); | |
auto sw = StopWatch(AutoStart.yes); | |
double reloc_ratio = 0.0; | |
ulong total_reloc; | |
version(all) | |
{ | |
foreach (i; 0 .. 8) | |
{ | |
immutable N = uniform(1024, 8 *1024 * 1024, rng); | |
Array!(Dummy, ExpGrowth!(num, 10)) ary; | |
foreach (j; 0 .. N) | |
ary.push(Dummy.init); | |
total_reloc += ary.relocs; | |
reloc_ratio += ary.relocs / double(N); | |
} | |
reloc_ratio /= 8; | |
} | |
else | |
{ | |
foreach (i; 0 .. 1_000) | |
{ | |
immutable N = uniform(0, 64 * 1024, rng); | |
Array!(Dummy, ExpGrowth!(num, 10)) ary; | |
foreach (j; 0 .. N) | |
ary.push(Dummy.init); | |
total_reloc += ary.relocs; | |
reloc_ratio += ary.relocs / double(N); | |
} | |
reloc_ratio /= 1_000; | |
} | |
if (print) | |
writeln(num * 1.0 / 10, ",", (cast(Duration) sw.peek).total!"usecs", | |
",", reloc_ratio,",", total_reloc); | |
} | |
} | |
void main() | |
{ | |
writeln("growth_factor,time_in_us,reloc_ratio,total_reloc"); | |
runLoop(false); // warmup | |
foreach (_; 0 .. 16) | |
runLoop(true); | |
} |
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