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prepared for flame graph analysis

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This commit is contained in:
Richard Thier 2025-09-30 17:19:47 +02:00
parent da0c024a32
commit ac873f7123
6 changed files with 66 additions and 72 deletions
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3
.gitmodules vendored
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@ -1,3 +1,6 @@
[submodule "vergesort"]
path = vergesort
url = https://github.com/Morwenn/vergesort
[submodule "FlameGraph"]
path = FlameGraph
url = https://github.com/brendangregg/FlameGraph

1
FlameGraph Submodule

@ -0,0 +1 @@
Subproject commit 41fee1f99f9276008b7cd112fca19dc3ea84ac32

3
makefile
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@ -24,7 +24,8 @@ release_ypsu_assert: ypsu.cpp magyarsort.h
release_ypsu_debug_sym: ypsu.cpp magyarsort.h
g++ ypsu.cpp -g -std=c++17 -O2 -o ypsu.out
release_ypsu_noinline_debug_sym: ypsu.cpp magyarsort.h thiersort3.h
g++ ypsu.cpp -g -std=c++17 -O2 -fno-inline -fno-inline-functions -fno-inline-functions-called-once -fno-inline-functions-called-once -fno-inline-small-functions -fno-ipa-cp -fno-ipa-sra -fno-early-inlining -fno-omit-frame-pointer -fno-optimize-sibling-calls -o ypsu.out
release3: test.cpp magyarsort.h
g++ test.cpp -DNDEBUG -std=c++17 -O3 -o test.out

24
thiersort3.h
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@ -41,9 +41,9 @@ static inline uint32_t witch_bucket3(uint32_t key) {
* @param n Number of elements in arr and temparr
* @param rstate Create with sch_rand_state rstate = schwab_rand_state(junk_uint32_t);
*/
static inline void thiersort3(uint32_t *arr, uint32_t *temparr, int n) {
int bucket[4096]; /* Inclusive */
int bucket_end[4096]; /* Not inclusive */
static inline void thiersort3(uint32_t *arr, uint32_t *temparr, uint32_t n) {
uint32_t bucket[4096]; /* Inclusive */
uint32_t bucket_end[4096]; /* Not inclusive */
/* Check if need to sort at all - needed for invariants later */
if(n < 2) {
@ -52,25 +52,25 @@ static inline void thiersort3(uint32_t *arr, uint32_t *temparr, int n) {
/* Count */
#pragma GCC unroll 64
for(int i = 0; i < 4096; ++i) {
for(uint32_t i = 0; i < 4096; ++i) {
bucket[i] = 0;
}
#pragma GCC unroll 64
for(int i = 0; i < n; ++i) {
for(uint32_t i = 0; i < n; ++i) {
++bucket[witch_bucket3(arr[i])];
}
/* Prefix sum (like in Magyarsort) */
uint32_t prev = 0;
#pragma GCC unroll 4
for (int i = 0; i < 4096; i++) {
for (uint32_t i = 0; i < 4096; i++) {
bucket[i] += prev;
prev = bucket[i];
}
/* Save end-offsets */
#pragma GCC unroll 64
for(int i = 0; i < 4096; ++i) {
for(uint32_t i = 0; i < 4096; ++i) {
bucket_end[i] = bucket[i];
}
@ -78,18 +78,18 @@ static inline void thiersort3(uint32_t *arr, uint32_t *temparr, int n) {
/* Move to the buckets */
/* Rem.: This also changes bucket[i] so they will point to bucket beginnings */
#pragma GCC unroll 64
for(int i = 0; i < n; ++i) {
for(uint32_t i = 0; i < n; ++i) {
uint32_t num = arr[i];
uint32_t witch = witch_bucket3(num);
int offset = (--bucket[witch]);
uint32_t offset = (--bucket[witch]);
temparr[offset] = num;
}
/* temparr -> arr each bucket and sort them in-place */
#pragma GCC unroll 64
for(int b = 0; b < 4096; ++b) {
int begin = bucket[b];
int end = bucket_end[b];
for(uint32_t b = 0; b < 4096; ++b) {
uint32_t begin = bucket[b];
uint32_t end = bucket_end[b];
/* Ensure exists */
if(begin >= end) {

100
threepass_xbit.h
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@ -20,6 +20,34 @@ static inline constexpr uint32_t min3u32_xb(uint32_t a, uint32_t b, uint32_t c)
((b <= c) ? b : c);
}
/** Copy the elements to their respective radics-place (f->t copy) */
static inline void copy_radics_tpxp(uint32_t *f, uint32_t *t, uint32_t *bucket, uint32_t shr, uint32_t mask, uint32_t n) {
// right-to-left to ensure already sorted digits order we keep for iterations
#pragma GCC unroll 48
for(uint32_t i = n; i > 0; --i) {
// Prefetch caches
//__builtin_prefetch(&a[i-8]);
// Get num and its new offset / location
auto num = f[i - 1];
auto bkeyni = (num >> shr) & mask;
auto offset = --bucket[bkeyni];
// Add to the proper target location
t[offset] = num;
}
}
/* I pulled these out only for better flame graph support */
/** Count occurences (can count together with good ILP) */
static inline void count_occurences_tpxp(uint32_t *bucket1, uint32_t *bucket2, uint32_t *bucket3, const uint32_t shr1, const uint32_t shr2, const uint32_t shr3, const uint32_t mask1, const uint32_t mask2, const uint32_t mask3, uint32_t *a, uint32_t n) noexcept {
#pragma GCC unroll 64
for(uint32_t i = 0; i < n; ++i) {
++bucket1[(a[i] >> shr1) & mask1];
++bucket2[(a[i] >> shr2) & mask2];
++bucket3[(a[i] >> shr3) & mask3];
}
}
/**
* Simple three-pass (ok: 3 + 1) bottom-up internal radix sort writter for thiersort3
*
@ -27,17 +55,17 @@ static inline constexpr uint32_t min3u32_xb(uint32_t a, uint32_t b, uint32_t c)
* @param buf Result array with the same size - result will be here
* @param n The number of elements
*/
static inline void threepass_xb(uint32_t *a, uint32_t *buf, int n) noexcept {
static inline void threepass_xb(uint32_t *a, uint32_t *buf, uint32_t n) noexcept {
assert(buf != NULL);
constexpr int shr1 = TPBX3 + TPBX2;
constexpr int shr2 = TPBX3;
constexpr int shr3 = 0;
constexpr int mask1 = (1 << TPBX1) - 1;
constexpr int mask2 = (1 << TPBX2) - 1;
constexpr int mask3 = (1 << TPBX3) - 1;
constexpr uint32_t shr1 = TPBX3 + TPBX2;
constexpr uint32_t shr2 = TPBX3;
constexpr uint32_t shr3 = 0;
constexpr uint32_t mask1 = (1 << TPBX1) - 1;
constexpr uint32_t mask2 = (1 << TPBX2) - 1;
constexpr uint32_t mask3 = (1 << TPBX3) - 1;
/* helper buffers. */
int sz = n * sizeof(a[0]);
uint32_t sz = n * sizeof(a[0]);
static thread_local uint32_t bucket1[1 << TPBX1];
memset(bucket1, 0, (1 << TPBX1) * sizeof(uint32_t));
@ -46,13 +74,7 @@ static inline void threepass_xb(uint32_t *a, uint32_t *buf, int n) noexcept {
static thread_local uint32_t bucket3[1 << TPBX3];
memset(bucket3, 0, (1 << TPBX3) * sizeof(uint32_t));
/* Count occurences (can count together with good ILP) */
#pragma GCC unroll 64
for(uint32_t i = 0; i < n; ++i) {
++bucket1[(a[i] >> shr1) & mask1];
++bucket2[(a[i] >> shr2) & mask2];
++bucket3[(a[i] >> shr3) & mask3];
}
count_occurences_tpxp(bucket1, bucket2, bucket3, shr1, shr2, shr3, mask1, mask2, mask3, a, n);
/* Count prefix sums - try as much ILP as possible because bigger arrays than usual! */
uint32_t prev1 = 0;
@ -63,7 +85,7 @@ static inline void threepass_xb(uint32_t *a, uint32_t *buf, int n) noexcept {
(1 << TPBX2),
(1 << TPBX3)
);
int i = 0;
uint32_t i = 0;
#pragma GCC unroll 8
for (; i < common; ++i) {
bucket1[i] += prev1;
@ -74,63 +96,29 @@ static inline void threepass_xb(uint32_t *a, uint32_t *buf, int n) noexcept {
prev3 = bucket3[i];
}
/* Do remaining 1 */
for (int j = i; j < (1 << TPBX1); ++j) {
for (uint32_t j = i; j < (1 << TPBX1); ++j) {
bucket1[j] += prev1;
prev1 = bucket1[j];
}
/* Do remaining 2 */
for (int j = i; j< (1 << TPBX2); ++j) {
for (uint32_t j = i; j< (1 << TPBX2); ++j) {
bucket2[j] += prev2;
prev2 = bucket2[j];
}
/* Do remaining 3 */
for (int j = i; j < (1 << TPBX3); ++j) {
for (uint32_t j = i; j < (1 << TPBX3); ++j) {
bucket3[j] += prev3;
prev3 = bucket3[j];
}
// Bottom digit a->buf
// right-to-left to ensure already sorted digits order we keep for iterations
#pragma GCC unroll 48
for(uint32_t i = n; i > 0; --i) {
// Prefetch caches
//__builtin_prefetch(&a[i-8]);
// Get num and its new offset / location
auto num = a[i - 1];
auto bkeyni = (num >> shr3) & mask3;
auto offset = --bucket3[bkeyni];
copy_radics_tpxp(a, buf, bucket3, shr3, mask3, n);
// Add to the proper target location
buf[offset] = num;
}
// Mid digit buf->a
// right-to-left to ensure already sorted digits order we keep for iterations
#pragma GCC unroll 48
for(uint32_t i = n; i > 0; --i) {
// Prefetch caches
//__builtin_prefetch(&buf[i-8]);
// Get num and its new offset / location
auto num = buf[i - 1];
auto bkeyni = (num >> shr2) & mask2;
auto offset = --bucket2[bkeyni];
copy_radics_tpxp(buf, a, bucket2, shr2, mask2, n);
// Add to the proper target location
a[offset] = num;
}
// Top digit a->buf
// right-to-left to ensure already sorted digits order we keep for iterations
#pragma GCC unroll 48
for(uint32_t i = n; i > 0; --i) {
// Prefetch caches
// __builtin_prefetch(&a[i-16]);
// Get num and its new offset / location
auto num = a[i - 1];
auto bkeyni = (num >> shr1) & mask1;
auto offset = --bucket1[bkeyni];
// Add to the proper target location
buf[offset] = num;
}
copy_radics_tpxp(a, buf, bucket1, shr1, mask1, n);
}
#endif /* THREE_PASS_XB_H */

7
ypsu.cpp
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@ -858,7 +858,8 @@ void measure_single(int n) {
//measure(inputtype, "sp", [&] { spsort(&v[0], v.size()); });
//measure(inputtype, "magyar", [&] { MagyarSort::sort<uint32_t>(&v[0], v.size()); });
//measure(inputtype, "thier2", [&] { do_thier2(&v[0], v.size()); });
measure(inputtype, "threep", [&] { do_threepass(&v[0], v.size()); });
//measure(inputtype, "threep", [&] { do_threepass(&v[0], v.size()); });
measure(inputtype, "thier3", [&] { do_thier3(&v[0], v.size()); });
for (auto r : results) printf("%9.3fs", r.second);
puts("");
@ -895,8 +896,8 @@ int main(int argc, char **argv) {
printf("Sorting %d elements:\n\n", n);
// Uncomment this for profiling and alg!
//measure_single(n);
//return 0;
measure_single(n);
return 0;
for (auto inputtype : inputtypes) {
printf("%10s", inputtype.c_str());