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cuda_gpupreagg.cu
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/*
* cuda_gpupreagg.cu
*
* Device implementation of GpuScan
* ----
* Copyright 2011-2023 (C) KaiGai Kohei <[email protected]>
* Copyright 2014-2023 (C) PG-Strom Developers Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the PostgreSQL License.
*/
#include "cuda_common.h"
#include "float2.h"
/*
* __writeOutOneTuplePreAgg
*/
STATIC_FUNCTION(int32_t)
__writeOutOneTuplePreAgg(kern_context *kcxt,
kern_data_store *kds_final,
HeapTupleHeaderData *htup,
const kern_expression *kexp_actions)
{
int nattrs = Min(kds_final->ncols, kexp_actions->u.pagg.nattrs);
uint32_t t_hoff, t_next;
uint16_t t_infomask = HEAP_HASNULL;
char *buffer = NULL;
t_hoff = MAXALIGN(offsetof(HeapTupleHeaderData,
t_bits) + BITMAPLEN(nattrs));
if (htup)
{
memset(htup, 0, t_hoff);
htup->t_choice.t_datum.datum_typmod = kds_final->tdtypmod;
htup->t_choice.t_datum.datum_typeid = kds_final->tdtypeid;
htup->t_ctid.ip_blkid.bi_hi = 0xffff; /* InvalidBlockNumber */
htup->t_ctid.ip_blkid.bi_lo = 0xffff;
htup->t_ctid.ip_posid = 0; /* InvalidOffsetNumber */
htup->t_infomask2 = (nattrs & HEAP_NATTS_MASK);
htup->t_hoff = t_hoff;
}
/* walk on the columns */
for (int j=0; j < nattrs; j++)
{
const kern_aggregate_desc *desc = &kexp_actions->u.pagg.desc[j];
kern_colmeta *cmeta = &kds_final->colmeta[j];
xpu_datum_t *xdatum;
int nbytes;
assert((char *)cmeta > (char *)kds_final &&
(char *)cmeta < (char *)kds_final + kds_final->length);
assert(cmeta->attalign > 0 && cmeta->attalign <= 8);
t_next = TYPEALIGN(cmeta->attalign, t_hoff);
if (htup)
{
if (t_next > t_hoff)
memset((char *)htup + t_hoff, 0, t_next - t_hoff);
buffer = (char *)htup + t_next;
}
switch (desc->action)
{
case KAGG_ACTION__VREF:
assert(desc->arg0_slot_id >= 0 &&
desc->arg0_slot_id < kcxt->kvars_nslots);
xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (XPU_DATUM_ISNULL(xdatum))
nbytes = 0;
else
{
nbytes = xdatum->expr_ops->xpu_datum_write(kcxt,
buffer,
cmeta,
xdatum);
if (nbytes < 0)
return -1;
}
break;
case KAGG_ACTION__NROWS_ANY:
case KAGG_ACTION__NROWS_COND:
assert(cmeta->attlen == sizeof(int64_t));
nbytes = sizeof(int64_t);
if (buffer)
*((int64_t *)buffer) = 0;
break;
case KAGG_ACTION__PMIN_INT32:
case KAGG_ACTION__PMIN_INT64:
nbytes = sizeof(kagg_state__pminmax_int64_packed);
if (buffer)
{
kagg_state__pminmax_int64_packed *r =
(kagg_state__pminmax_int64_packed *)buffer;
r->nitems = 0;
r->value = LONG_MAX;
SET_VARSIZE(r, sizeof(kagg_state__pminmax_int64_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
case KAGG_ACTION__PMAX_INT32:
case KAGG_ACTION__PMAX_INT64:
nbytes = sizeof(kagg_state__pminmax_int64_packed);
if (buffer)
{
kagg_state__pminmax_int64_packed *r =
(kagg_state__pminmax_int64_packed *)buffer;
r->nitems = 0;
r->value = LONG_MIN;
SET_VARSIZE(r, sizeof(kagg_state__pminmax_int64_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
case KAGG_ACTION__PMIN_FP64:
nbytes = sizeof(kagg_state__pminmax_fp64_packed);
if (buffer)
{
kagg_state__pminmax_fp64_packed *r =
(kagg_state__pminmax_fp64_packed *)buffer;
r->nitems = 0;
r->value = DBL_MAX;
SET_VARSIZE(r, sizeof(kagg_state__pminmax_fp64_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
case KAGG_ACTION__PMAX_FP64:
nbytes = sizeof(kagg_state__pminmax_fp64_packed);
if (buffer)
{
kagg_state__pminmax_fp64_packed *r =
(kagg_state__pminmax_fp64_packed *)buffer;
r->nitems = 0;
r->value = -DBL_MAX;
SET_VARSIZE(r, sizeof(kagg_state__pminmax_fp64_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
case KAGG_ACTION__PSUM_INT:
case KAGG_ACTION__PAVG_INT:
nbytes = sizeof(kagg_state__psum_int_packed);
if (buffer)
{
memset(buffer, 0, sizeof(kagg_state__psum_int_packed));
SET_VARSIZE(buffer, sizeof(kagg_state__psum_int_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
case KAGG_ACTION__PSUM_FP:
case KAGG_ACTION__PAVG_FP:
nbytes = sizeof(kagg_state__psum_fp_packed);
if (buffer)
{
memset(buffer, 0, sizeof(kagg_state__psum_fp_packed));
SET_VARSIZE(buffer, sizeof(kagg_state__psum_fp_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
case KAGG_ACTION__STDDEV:
nbytes = sizeof(kagg_state__stddev_packed);
if (buffer)
{
memset(buffer, 0, sizeof(kagg_state__stddev_packed));
SET_VARSIZE(buffer, sizeof(kagg_state__stddev_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
case KAGG_ACTION__COVAR:
nbytes = sizeof(kagg_state__covar_packed);
if (buffer)
{
memset(buffer, 0, sizeof(kagg_state__covar_packed));
SET_VARSIZE(buffer, sizeof(kagg_state__covar_packed));
}
t_infomask |= HEAP_HASVARWIDTH;
break;
default:
STROM_ELOG(kcxt, "unknown xpuPreAgg action");
return -1;
}
if (htup && nbytes > 0)
htup->t_bits[j>>3] |= (1<<(j&7));
t_hoff = t_next + nbytes;
}
if (htup)
htup->t_infomask = t_infomask;
return t_hoff;
}
/*
* __update_nogroups__nrows_any
*/
INLINE_FUNCTION(void)
__update_nogroups__nrows_any(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
int count;
count = __syncthreads_count(source_is_valid);
if (get_local_id() == 0)
{
if (__isShared(buffer))
*((uint64_t *)buffer) += count;
else
__atomic_add_uint64((uint64_t *)buffer, count);
}
}
/*
* __update_nogroups__nrows_cond
*/
INLINE_FUNCTION(void)
__update_nogroups__nrows_cond(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
int count;
if (source_is_valid)
{
xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (XPU_DATUM_ISNULL(xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (get_local_id() == 0)
{
if (__isShared(buffer))
*((uint64_t *)buffer) += count;
else
__atomic_add_uint64((uint64_t *)buffer, count);
}
}
/*
* __update_nogroups__XXXX
*/
/*
* __update_nogroups__pmin_int32
*/
INLINE_FUNCTION(void)
__update_nogroups__pmin_int32(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
int32_t ival;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_int32(&ival, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
ival = pgstrom_local_min_int32(source_is_valid ? ival : INT_MAX);
if (get_local_id() == 0)
{
kagg_state__pminmax_int64_packed *r =
(kagg_state__pminmax_int64_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
if (r->value > ival)
r->value = ival;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_min_int64(&r->value, (int64_t)ival);
}
}
}
}
/*
* __update_nogroups__pmin_int64
*/
INLINE_FUNCTION(void)
__update_nogroups__pmin_int64(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
int64_t ival;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_int64(&ival, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
ival = pgstrom_local_min_int64(source_is_valid ? ival : LONG_MAX);
if (get_local_id() == 0)
{
kagg_state__pminmax_int64_packed *r =
(kagg_state__pminmax_int64_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
if (r->value > ival)
r->value = ival;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_min_int64(&r->value, ival);
}
}
}
}
/*
* __update_nogroups__pmax_int32
*/
INLINE_FUNCTION(void)
__update_nogroups__pmax_int32(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
int32_t ival;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_int32(&ival, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
ival = pgstrom_local_max_int64(source_is_valid ? ival : INT_MIN);
if (get_local_id() == 0)
{
kagg_state__pminmax_int64_packed *r =
(kagg_state__pminmax_int64_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
if (r->value < ival)
r->value = ival;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_max_int64(&r->value, (int64_t)ival);
}
}
}
}
/*
* __update_nogroups__pmax_int64
*/
INLINE_FUNCTION(void)
__update_nogroups__pmax_int64(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
int64_t ival;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_int64(&ival, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
ival = pgstrom_local_max_int64(source_is_valid ? ival : LONG_MIN);
if (get_local_id() == 0)
{
kagg_state__pminmax_int64_packed *r =
(kagg_state__pminmax_int64_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
if (r->value < ival)
r->value = ival;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_max_int64(&r->value, ival);
}
}
}
}
/*
* __update_nogroups__pmin_fp64
*/
INLINE_FUNCTION(void)
__update_nogroups__pmin_fp64(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
float8_t fval;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_float64(&fval, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
fval = pgstrom_local_min_fp64(source_is_valid ? fval : DBL_MAX);
if (get_local_id() == 0)
{
kagg_state__pminmax_fp64_packed *r =
(kagg_state__pminmax_fp64_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
if (r->value > fval)
r->value = fval;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_min_fp64(&r->value, fval);
}
}
}
}
/*
* __update_nogroups__pmax_fp64
*/
INLINE_FUNCTION(void)
__update_nogroups__pmax_fp64(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
float8_t fval;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_float64(&fval, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
fval = pgstrom_local_max_fp64(source_is_valid ? fval : -DBL_MAX);
if (get_local_id() == 0)
{
kagg_state__pminmax_fp64_packed *r =
(kagg_state__pminmax_fp64_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
if (r->value < fval)
r->value = fval;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_min_fp64(&r->value, fval);
}
}
}
}
/*
* __update_nogroups__psum_int
*/
INLINE_FUNCTION(void)
__update_nogroups__psum_int(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
int64_t sum, ival = 0;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_int64(&ival, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
kagg_state__psum_int_packed *r =
(kagg_state__psum_int_packed *)buffer;
pgstrom_stair_sum_int64(ival, &sum);
if (get_local_id() == 0)
{
if (__isShared(r))
{
r->nitems += count;
r->sum += sum;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_add_int64(&r->sum, sum);
}
}
}
}
/*
* __update_nogroups__psum_fp
*/
INLINE_FUNCTION(void)
__update_nogroups__psum_fp(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
float8_t sum, fval = 0.0;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_float64(&fval, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
kagg_state__psum_fp_packed *r =
(kagg_state__psum_fp_packed *)buffer;
pgstrom_stair_sum_fp64(fval, &sum);
if (get_local_id() == 0)
{
if (__isShared(r))
{
r->nitems += count;
r->sum += sum;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_add_fp64(&r->sum, sum);
}
}
}
}
/*
* __update_nogroups__pstddev
*/
INLINE_FUNCTION(void)
__update_nogroups__pstddev(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
float8_t xval = 0.0;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
if (!__preagg_fetch_xdatum_as_float64(&xval, xdatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
float8_t sum_x, sum_x2;
pgstrom_stair_sum_fp64(xval, &sum_x);
pgstrom_stair_sum_fp64(xval * xval, &sum_x2);
if (get_local_id() == 0)
{
kagg_state__stddev_packed *r =
(kagg_state__stddev_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
r->sum_x += sum_x;
r->sum_x2 += sum_x2;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_add_fp64(&r->sum_x, sum_x);
__atomic_add_fp64(&r->sum_x2, sum_x2);
}
}
}
}
/*
* __update_nogroups__pavg_covar
*/
INLINE_FUNCTION(void)
__update_nogroups__pcovar(kern_context *kcxt,
char *buffer,
kern_colmeta *cmeta,
kern_aggregate_desc *desc,
bool source_is_valid)
{
float8_t xval = 0.0;
float8_t yval = 0.0;
int count;
if (source_is_valid)
{
const xpu_datum_t *xdatum = kcxt->kvars_slot[desc->arg0_slot_id];
const xpu_datum_t *ydatum = kcxt->kvars_slot[desc->arg1_slot_id];
if (!__preagg_fetch_xdatum_as_float64(&xval, xdatum) ||
!__preagg_fetch_xdatum_as_float64(&yval, ydatum))
source_is_valid = false;
}
count = __syncthreads_count(source_is_valid);
if (count > 0)
{
float8_t sum_x, sum_y, sum_xx, sum_yy, sum_xy;
pgstrom_stair_sum_fp64(xval, &sum_x);
pgstrom_stair_sum_fp64(yval, &sum_y);
pgstrom_stair_sum_fp64(xval * xval, &sum_xx);
pgstrom_stair_sum_fp64(yval * yval, &sum_yy);
pgstrom_stair_sum_fp64(xval * yval, &sum_xy);
if (get_global_id() == 0)
{
kagg_state__covar_packed *r =
(kagg_state__covar_packed *)buffer;
if (__isShared(r))
{
r->nitems += count;
r->sum_x += sum_x;
r->sum_xx += sum_xx;
r->sum_y += sum_y;
r->sum_yy += sum_yy;
r->sum_xy += sum_xy;
}
else
{
__atomic_add_uint32(&r->nitems, count);
__atomic_add_fp64(&r->sum_x, sum_x);
__atomic_add_fp64(&r->sum_xx, sum_xx);
__atomic_add_fp64(&r->sum_y, sum_y);
__atomic_add_fp64(&r->sum_yy, sum_yy);
__atomic_add_fp64(&r->sum_xy, sum_xy);
}
}
}
}
/*
* __updateOneTupleNoGroups
*/
STATIC_FUNCTION(void)
__updateOneTupleNoGroups(kern_context *kcxt,
kern_data_store *kds_final,
bool source_is_valid,
HeapTupleHeaderData *htup,
kern_expression *kexp_groupby_actions)
{
char *buffer;
assert((char *)htup > (char*)kds_final &&
(char *)htup <= (char *)kds_final + kds_final->length);
if (kcxt->groupby_prepfn_buffer)
{
buffer = kcxt->groupby_prepfn_buffer;
}
else
{
int nattrs = (htup->t_infomask2 & HEAP_NATTS_MASK);
bool heap_hasnull = ((htup->t_infomask & HEAP_HASNULL) != 0);
uint32_t t_hoff;
t_hoff = offsetof(HeapTupleHeaderData, t_bits);
if (heap_hasnull)
t_hoff += BITMAPLEN(nattrs);
t_hoff = MAXALIGN(t_hoff);
buffer = ((char *)htup + t_hoff);
}
assert((uintptr_t)buffer == MAXALIGN((uintptr_t)buffer));
for (int j=0; j < kexp_groupby_actions->u.pagg.nattrs; j++)
{
kern_aggregate_desc *desc = &kexp_groupby_actions->u.pagg.desc[j];
kern_colmeta *cmeta = &kds_final->colmeta[j];
/* usually, 'buffer' shall never be mis-aligned */
if (cmeta->attlen > 0)
buffer = (char *)TYPEALIGN(cmeta->attalign, buffer);
else if (!VARATT_NOT_PAD_BYTE(buffer))
buffer = (char *)TYPEALIGN(cmeta->attalign, buffer);
switch (desc->action)
{
case KAGG_ACTION__NROWS_ANY:
__update_nogroups__nrows_any(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__NROWS_COND:
__update_nogroups__nrows_cond(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PMIN_INT32:
__update_nogroups__pmin_int32(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PMIN_INT64:
__update_nogroups__pmin_int64(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PMAX_INT32:
__update_nogroups__pmax_int32(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PMAX_INT64:
__update_nogroups__pmax_int64(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PMIN_FP64:
__update_nogroups__pmin_fp64(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PMAX_FP64:
__update_nogroups__pmax_fp64(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PSUM_INT:
case KAGG_ACTION__PAVG_INT:
__update_nogroups__psum_int(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__PAVG_FP:
case KAGG_ACTION__PSUM_FP:
__update_nogroups__psum_fp(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__STDDEV:
__update_nogroups__pstddev(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
case KAGG_ACTION__COVAR:
__update_nogroups__pcovar(kcxt, buffer,
cmeta, desc,
source_is_valid);
break;
default:
/*
* No more partial aggregation exists after grouping-keys
*/
return;
}
/* move to the next */
if (cmeta->attlen > 0)
buffer += cmeta->attlen;
else
buffer += VARSIZE_ANY(buffer);
}
}
/*
* __insertOneTupleNoGroups
*/
STATIC_FUNCTION(kern_tupitem *)
__insertOneTupleNoGroups(kern_context *kcxt,
kern_data_store *kds_final,
const kern_expression *kexp_groupby_actions)
{
kern_tupitem *tupitem;
int32_t tupsz;
uint32_t required;
uint32_t usage;
size_t total_sz;
assert(kds_final->format == KDS_FORMAT_ROW &&
kds_final->hash_nslots == 0);
/* estimate length */
tupsz = __writeOutOneTuplePreAgg(kcxt, kds_final, NULL,
kexp_groupby_actions);
assert(tupsz > 0);
required = MAXALIGN(offsetof(kern_tupitem, htup) + tupsz);
assert(required < 1000);
total_sz = (KDS_HEAD_LENGTH(kds_final) +
MAXALIGN(sizeof(uint32_t)) +
required + __kds_unpack(kds_final->usage));
if (total_sz > kds_final->length)
return NULL; /* out of memory */
usage = __atomic_add_uint32(&kds_final->usage, __kds_packed(required));
tupitem = (kern_tupitem *)((char *)kds_final
+ kds_final->length
- __kds_unpack(usage)
- required);
__writeOutOneTuplePreAgg(kcxt, kds_final,
&tupitem->htup,
kexp_groupby_actions);
tupitem->t_len = tupsz;
tupitem->rowid = 0;
__threadfence();
__atomic_write_uint32(KDS_GET_ROWINDEX(kds_final),
__kds_packed((char *)kds_final
+ kds_final->length
- (char *)tupitem));
return tupitem;
}
STATIC_FUNCTION(bool)
__execGpuPreAggNoGroups(kern_context *kcxt,
kern_data_store *kds_final,
bool source_is_valid,
kern_expression *kexp_groupby_actions,
bool *p_try_suspend)
{
__shared__ kern_tupitem *tupitem;
bool try_suspend = false;
assert(kds_final->format == KDS_FORMAT_ROW);
assert(kexp_groupby_actions->opcode == FuncOpCode__AggFuncs);
for (;;)
{
if (get_local_id() == 0)
{
uint32_t nitems = __volatileRead(&kds_final->nitems);
uint32_t oldval;
if (nitems == 1)
{
/* normal case; destination tuple already exists */
tupitem = KDS_GET_TUPITEM(kds_final, 0);
assert(tupitem != NULL);
}
else if (nitems == 0)
{
oldval = __atomic_cas_uint32(&kds_final->nitems, 0, UINT_MAX);
if (oldval == 0)
{
/* LOCKED */
tupitem = __insertOneTupleNoGroups(kcxt, kds_final,
kexp_groupby_actions);
if (!tupitem)
{
try_suspend = true;
/* UNLOCK */
oldval = __atomic_write_uint32(&kds_final->nitems, 0);
assert(oldval == UINT_MAX);
}
else
{
/* UNLOCK */
oldval = __atomic_write_uint32(&kds_final->nitems, 1);
assert(oldval == UINT_MAX);
}
}
else
{
assert(oldval == 0 || oldval == UINT_MAX);
tupitem = NULL;
}
}
else
{
assert(nitems == UINT_MAX);
/* works in progress - someone setup the destination tuple */
tupitem = NULL;
}
}
/* out of memory? */
if (__syncthreads_count(try_suspend) > 0)
{
*p_try_suspend = true;
return false;
}
/* is the destination tuple ready? */
if (tupitem)
break;
}
/* update partial aggregation */
__updateOneTupleNoGroups(kcxt, kds_final,
source_is_valid,
&tupitem->htup,
kexp_groupby_actions);
return true;
}
/*
* __insertOneTupleGroupBy
*/
STATIC_FUNCTION(kern_hashitem *)
__insertOneTupleGroupBy(kern_context *kcxt,
kern_data_store *kds_final,
kern_expression *kexp_groupby_actions)
{
kern_hashitem *hitem;
int32_t tupsz;
union {
uint64_t u64;
struct {
uint32_t nitems;
uint32_t usage;
} kds;
} oldval, curval, newval;
assert(kds_final->format == KDS_FORMAT_HASH &&
kds_final->hash_nslots > 0);
/* estimate length */
tupsz = __writeOutOneTuplePreAgg(kcxt, kds_final, NULL,
kexp_groupby_actions);
assert(tupsz > 0);
/* expand kds_final */
curval.u64 = __volatileRead((uint64_t *)&kds_final->nitems);
for (;;)
{
uintptr_t tup_addr;
size_t total_sz;
/*
* NOTE: A L1 Cache Line should not be shared by multiple tuples.
*
* When we try to add a new tuple on the same L1 cache line that is
* partially used by other tuples, this cache line may be already
* loaded to other SMs L1 cache.
* At CUDA 12.1, we observed the newer tuple that is written in this
* L1 cache line is not visible to other SMs. To avoid the problem,
* we ensure one L1 cache line (128B) will never store the multiple
* tuples. Only kds_final of GpuPreAgg will refer the tuple once
* written by other threads.
*/
tup_addr = TYPEALIGN_DOWN(CUDA_L1_CACHELINE_SZ,
(uintptr_t)kds_final
+ kds_final->length
- __kds_unpack(curval.kds.usage)
- (offsetof(kern_hashitem, t.htup) + tupsz));